HomeMy WebLinkAboutMINUTES - 07222008 - C.4 1
C TO: BOARD OF SUPERVISORS ���-:sF-;` °�
-=, Cont
FROM: JULIA R. BUEREN, PUBLIC WORKS DIRECTO
Costa
DATE:,. JULY 22, 2008 County
•i•�;�_covti`�`
SUBJECT: APPROVE Addendum #2 to. the Bethel Island Bridge Replacement Project Mitigated Negative
Declaration in compliance with the California Environmental Quality Act, Bethel Island area.
(88% Highway Bridge Rehabilitation and Replacement Program Funds and 12% Local Road
Funds).(District V) [CDD=CP# 03-36] Project No.: 0662-6R4043
SPECIFIC REQUEST(S)OR RECOMMENDATION(S)&BACKGROUND AND JUS-1-11--ICA-HON
•r ,
RECOMMENDED ACTION:
APPROVE the Second Addendum to the Bethel Island Bridge Replacement Project Mitigated Negative
Declaration in compliance with the California Environmefital Quality Act, and
FIND that the changes to the project description are minor and technical in nature and do not create any
environmental impacts not previously addressed in the Mitigated Negative Declaration and Addendum #1, and
DIRECT the Director of the Department of Conservation and Development, Community Development Division
to file a Notice 4betermination with the County Clerk, and
AUTHORIZE the Public Works Director to arrange for payment of a $25 fee to Community Development for
processing and a $50 fee to the County Clerk for filing the Notice of Deter ination.
Continued on Attachment: ® SIGNATURE: t�
RECOMMENDATION OF COUNTY ADMINISTRATOR ❑ kECOMMENDATIO OF BOARD COMMITTEE
APPROVE .❑ OTHER
SIGNATURE(S):,;.
ACTION OF BOARD ON 2 �
APPROVED AS,RFCOM ND EZe OT11ER ❑
VOTE OF SUPERVISORS I hereby certify that this is a true and correct copy of an action
UNANIMOUS(ABSENT taken and entered on the nunutes of the Board of Supervisors on
AYES NOES the date shown.
ABSENT: ABSTAIN:
. QA dX0
LC:vzSvc\ENVIRO\BO\2008\(7-22-08)CEQA Bethel Neg.Dec Add#2.docx ATTESTED:
aelowaop-
Orig.Div:Public Works(Environmental Section) JOHN CULLEN . E OF TH BOARD OF SUPERVISORS
Contact: Leigh Chavez,(313-2366) AND COUNTY DMNISTRATOR
cc: Administrator—Attn.E.K_uevor.
Auditor-Controller
J.Ring,Community Development
Public Works: Construction—.K.Emigh By. Deputy
Design—N.Leary
Environmental—L.Chavez
SUBJECT: APPROVE Addendum #2 to the Bethel Island Bridge Replacement Project Mitigated Negative
Declaration in compliance with the California Environmental Quality Act, Bethel Island area.
(88% Highway Bridge Rehabilitation and Replacement Program Funds and 12% Local Road
Funds) (District V) [CDD-CP#03-36] Project No.: 0662-6R4043
DATE: July 22, 2008
PAGE: 2 of 2
FISCAL IMPACT:
The estimated project cost is $12 million funded by Highway Bridge Rehabilitation and Replacement Program
Funds (88%) and Local Road Funds (12%).
REASONS FOR RECOMMENDATIONS AND BACKGROUND:
The Bethel Island Bridge Replacement Project Mitigated Negative Declaration (MND) and Addendum #1 to the
MND evaluated the proposed project which consists of replacement of an existing aging wooden bridge with a
new concrete structure according to current design standards. As a result of the complexity of the bridge
replacement project design and construction logistics, several minor technical changes to the project have been
determined to be necessary during detailed project design.
These minor technical changes include: installation of temporary and permanent steel sheet piling at the
northern abutment, removal of portions of the existing northern abutment, and annoring the face of the new
northern abutment and footing with rock slope protection. Work on the southern abutment will require
placement of rock slope protection in a manner different than previously analyzed in MND Addendum #1. In
addition, based on community interest, decorative/safety lighting and pedestrian overlooks will be added to the
bridge design. The previously adopted Mitigated Negative Declaration, Addendum #1 and Addendum #2 are
attached.
CONSEQUENCES OF NEGATIVE ACTION:
Delay in approving the addendum will result in a delay of the Department's ability to move forward with
construction and may jeopardize funding.
ADDENDUM #2 to the
MITIGATED NEGATIVE DECLARATION
for the Bethel Island Bridge Replacement Project
SCH# 2003082087
Project # 0662-6R4043
CP# 03-36
PREFACE
The Bethel Island Bridge Replacement Project Mitigated Negative Declaration
(MND)evaluated the proposed project which consists of replacement of the existing aging
wooden bridge with a new concrete structure according to current design standards. The
project consists of constructing a new approximately 860-foot long, 50-foot wide bridge with
two 12-foot lanes, a 12-foot left turn lane at the south end,two 5-foot shoulders, two'5-foot
sidewalks and barrier railings. Based on the increased length of the bridge, the project
also includes constructing a raised access road between the bridge approach and the
levee on the southeast side of the bridge.
The Contra Costa Community Development Department(CDD)is the Lead Agency
for the project. On November 5, 2003, the Board of Supervisors (Board) approved the
project and filed a Notice of Determination.(NOD)with the County Clerk. On February 15,
2006 an Addendum to the.MND was approved by the Board and an NOD was filed with the
County Clerk.
This document serves as a 2nd Addendum to the Bethel Island Bridge
Replacement Project Mitigated Negative Declaration (CP#' 03-36; SCH# 2003082087).
The MND for the project consists of the original MND (dated July 1; 2003 and filed on
November 5, 2003), the first MND Addendum (dated February 14, 2006 and filed on
February 15, 2006) and this Addendum.
CEQA PROCESS
The California'Environmental Quality Act- (CEQA) stipulates that an Addendum
(CEQA Guidelines Section 15164) to a previously adopted MND may.be prepared if only
minor technical changes are necessary and none of the conditions described in CEQA
Guidelines Section,15162 have occurred:
1. No substantial changes are proposed in the project which will require
major revisions of the previous MND due to the involvement of new
significant environmental effects or a substantial increase in the severity of
previously identified significant effects;
G:\EngSvc\ENVIRO\TransEng\Bethel Island Bridge\CEQA\Neg Dec Addendum#2.doc .
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2. No substantial changes with respect to the circumstances under which
the project is undertaken which require major revisions of MND due to the
involvement of new significant effects or a substantial increase in the severity
of previously identified significant effects; or
3. No new information of substantial importance shows that the project will
have one or more significant effects not previously discussed in the MND.
In accordance with CEQA Guidelines Section 15164(d), the Board shall consider
this 2nd Addendum along with the MND and 1 st Addendum prior to making a decision on
the project. According to CEQA Guidelines Section 15164(c) an Addendum does ,not
require circulation for public review but can be included in or attached to the MND. -As
noted in the Preface, this Addendum is attached to the MND for the Bethel Island Bridge
Replacement Project (CP# 03-36, SCH# 2003082087).
EXPLANATION OF THE ADDENDUM
This Addendum to the MND for Bethel Islarld,Bridge Replacement Project identifies minor
technical changes in the project design.
DESIGN
The logistics associated with replacing the Bethel Island Bridge (both design and
construction) are very complicated since the; new bridge will be..constructed in essentially
the same location as the old bridge. The bridge is being replaced in the same location
specifically to avoid major impact to the dovvntown Bethel Island community.
As a result of the complexity of the: bridge .replacement. project, several minor
technical changes to the project analyzed by the Mitigated Negative Declaration filed on
November 5; 2003 (and the first Addendum to the MND filed on February 15, 2006) have
been determined to be necessary during detailed project design. .These minor technical
changes include: installation of temporary and permanent steel sheet piling at the northern
abutment, removal of portions of the existing northern abutment, and armoring the face of
the new northern abutment and footing with rock slope protection. Work on the southern
abutment will require placement of rock ;slope protection differently than previously
analyzed in MND Addendum #1, as well. . In addition, based on community interest,
decorative/safety lighting and pedestrian overlooks will be added to the. bridge design.
Each of these additions or modifications to the previously analyzed project is discussed
below.
This Addendum is consistent with County policies and does not lead directly or
indirectly to significant physical changes in the project, nor does it alter the adequacy or the
completeness of the environmental impacts and mitigation measures identified in the MND.
Therefore, this Addendum to the MND is appropriate.
G:\EngSvc\ENVIRO\TransEng\Bethel Island Bridge\CEQA\Neg Dec.Addendum#2.doc
2
ADDITIONS..TO THE MND
This section identifies the language which is added and/or changed (bold face type) or
deleted (strikeeut) to the text and figures of the MND and/or Addendum #1 to the MND.
The environmental impacts are discussed in "Environmental Initial Study: Bethel.lsland
Bridge Replacement Project, dated July 1, 2003 (attached)and filed on November 5, 2003
as well as the 1St Addendum to the MND dated February 14, 2006 and filed on February
15, 2006. The changes below pertain to the document referenced above.
1. Installation of Bridge Lighting and Pedestrian Overlooks
Page 8, 2nd Paragraph.(Aesthetics):
Lighting-will be
installed along the length of the bridge and. on the bridge approach roads.
Twenty six street lights will be installed on the bridge. The proposal for lighting
on the bridge received strong community support at Bethel'Island Town Hall
Meetings. While the lights will provide for pedestrian and motorist safety, they
will also be decorative and.will enhance the aesthetics of the bridge. The lights
will be consistent with the style of lighting already installed at.'the nearby Bethel
Park and 500 unit development. The bridge is located in an area that is largely.
commercial in nature; therefore; the lights will not create a significant source of
nighttime glare. The lights have been annexed into County Service Area L-100 for
operation and maintenance.. In addition to decorative lighting,.the bridge design
will also include pedestrian overlooks. The overlooks will be located at:midspan
.of the bridge and will be constructed by flaring out the sidewalks from 5' to 10' in
width, The overlooks will provide an opportunity for pedestrians to view the
Bethel Island/Dutch Slough area from the bridge in a location that is isolated from
vehicular traffic. The addition of the overlooks to the bridge design will not
modify the appearance of the bridge significantly.
2. Installation of Temporary Work Trestle Pilings
Page 14, 2 nd Paragraph (Biological Resources): Between approximately 75 and.100
temporary piles will be driven in. Dutch Slough in order to create a work trestle
that will allow, construction of a work platform from which portions of the new
bridge will be constructed. These temporary piles are strong, but have very
limited volume based on their shape (either H-beam or hollow pipe shells).
Based on their very limited volume, the temporary piles displace very small
amounts of bed material as they are driven and, therefore, sedimentation is very
G:\EngSvc\ENVIRO\TransEng\Bethel Island Bridge\CEQA\Neg Dec Addendum#2.doc
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limited. Depending on the substrate it is possible these temporary piles can be
installed via vibration rather than pile driving. Both U.S. Fish and Wildlife Service
(FWS) and National Marine Fisheries Service (NMFS) have been made aware of
the need for temporary piles associated with the bridge falsework and have
concurred that the temporary piles (as well as the project as a whole) are not
likely to adversely affect aquatic resources in Dutch Slough.
Page 23, 3rd Paragraph (Hydrology and Water Quality):
Between approximately 75 and 100 temporary piles will be driven in Dutch Slough
in order to create a work trestle that will allow construction of a work platform
from which portions of the, new bridge will be constructed. These temporary
piles are strong, but have very limited volume based on their shape (either H-
beam or hollow pipe shells). Based on their very limited volume, the temporary
piles displace very small amounts of bed material as they are driven and,
therefore, sedimentation is very limited. Depending on the substrate it is
possible these temporary piles can be installed via vibration rather than pile
driving, further reducing the potential for release of bed sediments.
3. Installation of Temporary Sheet Piling
Page 14, 1 st Paragraph (Biological Resources): In order to allow for construction of.
the new northern abutment, temporary sheet piles will be driven into the slough
in three stages (as the work on the abutment progresses),. The sheet pile drivers
will operate from the top of the levee, on work trestles,-or from barges. The sheet
piles will isolate the work area from the slough allowing the work area to be
dewatered to create a dry zone for abutment construction. In order to ensure
aquatic life is not trapped by the dewatering effort,a qualified biologist will be on-
site during the water draw-down effolrts. Any aquatic life that is trapped within
the work area will be collected and relleased into the slough outside of the work
.zone. In addition, the work area water collected during the dewatering process
and any nuisance water that seeps into the work area will be treated prior to
release or off-hauled to an appropriate disposal facility.
The sheet piles that will be installed are narrow plates of steel that will be driven
into the slough bottom by press-in method,which creates minimal sedimentation
and vibration. The sheet piles are shallow in depth and will be localized around
the work area necessary to complete the northern abutment. Based on the
shallow depth, short installation distance, and low vibration press-in method,
impacts associated with the sheet pile driving are expected to be negligible.
Once the abutment work is completed,the sheet piles will be removed by burning
them off at the mudline with an underwater welding torch. Any turbidity
generated as a result of the sheet piling installation will be monitored in
accordance with existing permit limitations. No new biological impacts are
expected as a result of the sheet piling installation or removal.
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Page 23, 3`d Paragraph (Hydrology and Water Quality): In order to allow for
construction of the new northern abutment, temporary sheet piles will be driven
into the.slough in three stages (as the work on the abutment progresses). The
sheet piles will isolate the work area from the slough zone and allow the area to
be dewatered to create a dry work area for abutment construction. The sheet
piles that will be.installed are narrow plates of steel that will be driven by press-in
method, which creates less vibration and pounding than traditional pile driving.
The sheet piles are shallow in depth and will be installed over a short distance.
Based on the shallow depth,short installation distance, and low vibration press-
in method, impacts associated with the sheet pile driving are expected to be .
negligible. The sheet piles will be removed by burning them off at the mudline.
Because work on the northern abutment will occur over two construction
seasons, there is the potential for a sizeable storm occurring during the winter
months between the construction seasons. The sheet piling will provide 100 year
flood protection of the northern levee throughout the entire construction period.
Any turbidity generated as a result of the sheet piling installation will be
monitored in accordance with existing permit limitations. No new water quality
impacts are expected as a result of this sheet piling installation.
1: Existing Abutment Work
Page 14, 2nd Paragraph.(Biology): At the northern end of the bridge the existing
northern abutment will be removed and the footing for the new abutment will be
excavated. Twenty 14" diameter piles will be driven to depth and then a
reinforced concrete footing will be installed over the piles. Once the footing has
been installed, the concrete abutment will be poured above the footing. All of
this work will occur entirely within the dewatered area behind the sheet pile
cofferdam wall and. will therefore have . a negligible •impact on biological
resources. Prior to dismantling of the dewatering system,the concrete abutment
will either be allowed to cure for,a full 30.days or a concrete sealant will be used
to coat the abutment. These measures will ensure no deleterious effects to
biological resources occur due to uncured concrete coming in contact.with the
slough waters.
Page 23, 4th Paragraph (Hydrology and Water Quality): At the northern end of the
bridge the existing northern abutment will be removed and the footing for the
new abutment will be excavated. All of this work will occur entirely within the
dewatered area behind the;sheet pile cofferdam wall and will therefore have no
impact on the water quality of the slough. The concrete abutment will either be
allowed to cure for a full 30 days or a concrete sealant will be used to coat the
abutment before-the dewatering system is dismantled. These measures will
ensure no deleterious.effects to water quality occur due to contact of uncured
G:\EngSvc\ENVIRO\TransEng\Bethel Island Bridge\CEQA\Neg Dec Addendum#2.d6c
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concrete with the slough waters.
2. Riprap Installation
Page 14, 3rd Paragraph (Biology): The new northern abutment will be armored with
rock slope protection (RSP).to prevent scour erosion along its footing. Contract
specifications will.require that the rock be clean (i.e., washed) and free of fines
that could potentially lead to sedimentation in the slough. Although the rock will
.be placed after the sheet pile cofferdams have been removed, it will be placed
"by-hand": contract specifications will '.require that. the- rocks be . placed
individually (one at a time) by backhoe or similar piece of equipment to ensure
water quality. impacts are negligible.. A floating silt. curtain (weighted at the
bottom) will be installed around the rock placement zone to ensure any fines
released by placement of the rock will settle in the work zone rather than
spreading through the slough. As with all other in-water work activities,turbidity
will be monitored in accordance with existing permit conditions. In order to
mitigate for the 0.029 acre of fill at the northern levee due to the placement of
riprap below the mean high tide line of Dutch Slough, the County will purchase
Mitigation credits at the North Suisuin Mitigation Bank (the U.S. Army Corps of
Engineers has already agreed to the lourchase of credits.at this mitigation bank
for impacts due to the project on U.S. Army Corps of Engineers jurisdiction).
Page 23, 5th Paragraph (Hydrology and Water Quality): The new northern abutment
will be armored with rock slope protection (RSP) to prevent scour erosion along
its footing. Contract. specifications will require that the. rock be clean (i.e.,
washed) and-free of fines that could potentially lead to.sedimentation in the
slough: Although the rock will be placed after the sheet pile cofferdams have
been removed, it will be placed "by-Mand": contract specifications will require
that the rocks be placed individually(one at a time) by backhoe or similar piece of
equipment to ensure water quality impacts are negligible. A floating silt curtain
(weighted at the,bottom) will be installed around the rock placement zone to
ensure any fines released by placement of the rock will settle in the work'zone
rather than spreading through the slough. As with all' other in-water work
activities, turbidity will be monitored in accordance with existing permit
conditions.
Page 6, Paragraph 3 of Addendum #1 to the Mitigated Negative Declaration: All well:
a66GGiated with the paFtial abutment rernaval and baRk pFeteptiOR Will GGGUF Outside G
the slough and the aveidaRGe and minimization meati Ferfalready analyzed in theIVIND
filed iR NavembeF 2003 well ensure that peteRtial 'FnpaGtS tO wat id bielOgaGal
reser FGe re veiled and minimized Contract specifications will require thatthe
i�.svaivc�urczry oia cv arrmT►rrmTnzti�
rock be clean (i.e., washed) and fres: of fines that could potentially lead to
sedimentation in the slough. Although the rock will be placed after the
dewatering system has been removed, it will be placed "by-hand": contract
specifications will require that the rocks be placed individually(one at a time) by
G,\EngSvc\ENVIRO\TransEng\Bethel Island Bridge\CEQA\Neg Dec Addendum#2.doc
6
backhoe or similar piece of equipment to ensure water quality impacts are
negligible. A floating silt curtain (weighted at the bottom)will be installed around
the rock placement.zone to ensure any fines released by placement of the rock
will settle in the work zone rather than spreading through the slough. As with all
other in-water work activities, turbidity will be monitored in accordance with
existing permit conditions.. In order to mitigate for the 0.015 acre of fill at the
southern due to the placement of riprap below the mean high tide line of Dutch
Slough, the County Will purchase mitigation credits at the North Suisun Mitigation
Bank (the U.S. Army Corps of Engineers has already agreed to the purchase of
credits at this'mitigation bank for impacts due to the project on U.S`.Army Corps
of Engineers jurisdiction).
Gi\EngSvc\ENVIRO\TransEng\Bethel Island Bridge\CEQA\Neg Dec Addendum#2.doc
7
CONTRA COSTA COUNTY ADDENDUM #2 FINDINGS for the
MITIGATED NEGATIVE DECLARATIOWfor
BETHEL ISLAND BRIDGE: REPLACEMENT PROJECT
The following information is added to the previous MND and is presented to comply with
Section 15091 of the CEQA Guidelines for the MND for the Bethel Island Bridge
Replacement Project
1. Environmental Effect: Modifications to the design section as described in this
Addendum, are minor technical changes or additions to the project and will not
result in any additional environmental effects not previously discussed.
Findings: There are no significant environmental impacts associated with the
minor technical changes or additions for the proposed activity for which this
Addendum was prepared.
Statement of Facts:
a. The project to be developed pursuant to this Addendum to the MND for the
Bethel Island Bridge Replacement Project is substantially similar to the project
analyzed in the MND.
b. The MND for the Bethel Island Bridge Replacement Project consists of the MND,
comments received, responses to the comments raised,Addendum#1 to the MND,
and this Addendum (Addendum #2). The MND was completed in compliance with
CEQA.
c. There are no substantial changes, pursuant to CEQA Guidelines Section 15162
(a)(1), in the project that require major revisions of the MND due to the involvement
of new significant environmental effects or a substantial increase in the severity of
previously identified significant effects. The project is substantially similar to the
project analyzed in the MND.
d. There are no substantial changes with respect to the circumstances, pursuant to
CEQA Guidelines Section 15162 (a)(2), under which the Bethel Island Bridge
Replacement Project is undertaken which require major revisions of the previous
MND due to the involvement of new significant environmental effects or a
substantial increase in the severity of ipreviously identified.significant effects. Those
circumstances remain substantially ;similar to the circumstances analyzed in the
MND.
e. There is no new information of substantial importance, pursuant to CEQA
Guidelines Section 15162 (a)(3), which shows that the project will have one or
G:\EngSvc\ENVIRO\TransEng\Bethel Island Bridge\CEQA\Neg Dec Addendum#2.doc
f3
more significant effects not previously discussed in the MND.
f. None of the conditions calling for the preparation of a subsequent or
supplemental EIR have occurred (see items 1 c - e above). Therefore, it is
appropriate to adopt,this Addendum to the MND to make the minor technical
changes and.additions discussed in this document (CEQA Guidelines 15164). .
This Addendum shall be considered along with the MND and Addendum #1
prior to the Board making a decision on the minor technical changes or
additions to the project, and in considering these changes or additions, the
Board is considering the identical or substantially similar underlying project.
The findings are supported by substantial evidence in the administrative record and are
based on the MND for the Bethel Island Bridge Replacement Project,which was subject to
public review.
In accordance with CEQA Guidelines Section 15164(d), the County Board of Supervisors
shall consider this Addendum along with the MND (including Addendum #1) prior to
making a decision on the project. According to CEQA Guidelines Section 15164(c) an
Addendum does not require circulation for public review but can be included in or attached
to the MND. As noted in the Preface, this Addendum is attached to the MND for the
Bethel Island Bridge Replacement Project (CP# 03-36; SCH# 2003082087).
LC:
G:\EngSvc\ENVIRO\TransEng\Bethel Island Bridge\CEQA\Neg Dec Addendum#2.doc
9
CALIFORNIA.ENVIRONMENTAL QUALITY ACT
NOTICE OF DETERMINATION
CONTRA COSTA COUNTY COMMUNITY DEVELOPMENT DEPARTMENT
651 PINE STREET 4TH FLOOR NORTH WING MARTINEZ, CALIFORNIA 94553-0095
Telephone:. (925)313-2366 Contact Person: Leigh Chavez, Environmental Analyst III
Project Description, Common Name (if any) and Location: Bethel Island Bridge Replacement Project. County File #
CP 03-36. The project consists of replacement of the existing aging wooden bridge with a new concrete structure
according to current design standards. The project includes constructing a new approximately 860-foot long, 50-foot wide
bridge with two 12-foot lanes, a 12-foot left turn lane at the south end, two 5-foot shoulders, two 5-foot sidewalks and
barrier railings. Based on the increased length of the bridge, the project also includes constructing a raised access road
between the bridge approach and the levee on the southeast side of the bridge. As a result of the complexity of the
bridge replacement project design and construction logistics, several minor technical changes to the project analyzed by
the Mitigated Negative Declaration filed on November 5, 2003 and Addendum #1 to the Mitigated Negative Declaration
filed on February 15, 2006 have been determined to be necessary during detailed project design. These minor technical
changes include` installation of temporary and permanent steel sheet piling at the northern abutment, removal of portions
of the. existing northern abutment, and armoring the face of the new northern abutment and footing with rock slope
protection, Work on the southern abutment.will require placement of rock slope protection differently than previously
analyzed in MND Addendum #1, as well. In addition, based on community interest, decorative/safety lighting and
pedestrian overlooks will be added to the bridge design.
Pursuant to the provisions of the California Environmental Quality Act:
❑ An Environmental Impact Report was prepared and certified (SCH# )
❑ The Project was encompassed by an Environmental Impact Report previously prepared for (SCH 4).
® A 2nd Addendum to the Mitigated Negative Declaration was prepared on May 19, 2008.
Copies of the record of project approval and the Negative Declaration or the final EIR may be examined at the office of the
Contra Costa County Public Works Department.
® The Project will not have a significant environmental effect.
❑ The Project will have a significant environmental effect.
® Mitigation measures were made a condition of approval of the project.
❑ A statement of overriding considerations was adopted.
❑ Findings were adopted pursuant to Section 15091 of the State CEQA Guidelines.
Date: By:
Community Development Department Representative
AFFIDAVIT OF FILING AND POSTING
I declare that on I received and posted this notice as required by California
Public Resources Code Section 21152(c). Said notice will remain posted for 30 days from the filing date.
Signature Title
Applicant: Department of Fish and Game Fees Due: Total Due: $
Public Works Department X Neg Dec-$1,876.75 Total Paid $
255 Glacier Drive
Martinez, CA 94553 X County Clerk-$50 Receipt#:
Community Development Dept.-$25
Attn: Leigh Chavez
G:\GrpData\EngSvc\ENVIRO\TransEng\Bethel Island Bridge\CEQA\Addendum#2 NOD.doc
CALIFORNIAN ENVIRONMENTAL QUALITY ACT
NOTICE OF DETERMINATION
CONTRA COSTA COUNTY COMMUNITY DEVELOPMENT DEPARTMENT
651 PINE STREET 4TH FLOOR NORTH WING MARTINEZ, CALIFORNIA 94553-0095
Telephone: (925)313-2366 Contact Person: Leigh Chavez, Environmental Analyst III
Project Description, Common Name (if any) and Location: Bethel Island Bridge Replacement Project. County File #
CP 03-36. The project consists of replacement of the existing aging wooden bridge with a new concrete structure
according to current design standards. The project includes constructing a new approximately 860-foot long, 50-foot wide
bridge with two 12-foot lanes, a 12-foot left turn lane at the south end, two 5-foot shoulders, two 5-foot sidewalks and
barrier railings. Based on the increased. length of the bridge, the project also includes constructing a raised access road
between the bridge approach and the levee`on the southeast side of the bridge. As a result of the complexity of the
bridge replacement project design and construction logistics, several minor technical changes to the project analyzed by
the Mitigated Negative Declaration filed on November 5, 2003 and Addendum #1 to the Mitigated Negative Declaration
filed on February 15, 2006 have been determined to be necessary during detailed project design. These minor technical
changes include:.installation of temporary and permanent steel sheet piling at the northern abutment, removal of portions
of the existing northern abutment, and armoring the face of the new northern abutment and footing with rock slope
protection. Work on the southern abutment'will require placement of rock slope protection differently than previously
analyzed in MND Addendum #1, as well. In addition, based.on community interest, decorative/safety lighting and
pedestrian overlooks will be added to the bridge design.
Pursuant to the provisions of the California Environmental Quality Act:
❑ An Environmental Impact Report was'prepared and certified (SCH # )
❑ The Project was encompassed by an Environmental Impact Report previously prepared for (SCH#).
® A 2nd Addendum to the Mitigated Negative Declaration was prepared on May 19, 2008.
Copies of the record of project approval and the-Negative Declaration or the final EIR may be examined at the office of the
Contra Costa County Public Works Department.
® The Project will not have a significant environmental effect.
❑ The Project will have a significant environmental effect.
® Mitigation measures were made a condition of approvalof the project.
❑ A statement of overriding considerations was adopted.
❑ Findings were adopted pursuant to Section 15091 of the State CEQA Guidelines.
Date: By:
Community Development Department Representative
AFFIDAVIT OF FILING AND POSTING
1 declare that on I received and posted this notice as required by California
Public Resources Code Section 21152(c).. Said notice will remain posted for 30 days from the filing date.
Signature Title
Applicant: Department of Fish and Game Fees Due: Total Due: $
Public Works Department X Neg Dec-$1,876.75 Total Paid $
255 Glacier Drive
Martinez,CA 94553 X County Clerk-$50 Receipt#:
Community Development Dept:-$25
Attn: Leigh Chavez
G:\GrpData\EngSvc\ENVIRO\TransEng\l3ethe]Island Bridge\CEQA\Addcndum k2 NOD.doc
CALIFORNIA ENVIRONMENTAL QUALITY ACT
NOTICE OF DETERMINATION
CONTRA COSTA COUNTY COMMUNITY DEVELOPMENT DEPARTMENT
651 PINE STREET 4TH FLOOR NORTH WING MARTINEZ, CALIFORNIA 94553-0095:
Telephone: (925)313-2296 Contact Person: Cece Sellgren, Environmental Planner
Project Description,Common Name(if any) and Location:Bethel Island Bridge Replacement Project. County File#CP
03-36. The project consists of replacement of the existing aging wooden bridge with a new concrete structure according to
current design standards. The project includes constructing a new approximately 860-foot long,50-foot wide bridge.with two
12-foot lanes,a 12-foot left turn lane at the south end,two 5-foot shoulders,two 5-foot sidewalks and barrier railings. Based on
the increased length of the bridge,the project also includes constructing a raised access road between the bridge approach
and the levee on the southeast side of the bridge. As a result of the complexity of the bridge replacement project design and
construction logistics, several minor technical changes to the project analyzed by the Mitigated Negative Declaration filed on
November 5, 2003 have been determined to be,necessary during detailed project design. These minor.technical changes
include: two minor road detours, several utility relocations, minor drainage improvements, and replacement of the planned
mechanically stabilized earth (MSE)wall with a new embankment slope. These minor technical changes will require real
property transactions beyond those discussed within the November 2003 document.
Pursuant to the provisions of the California Environmental Quality Act:.
❑ .An Environmental Impact Report was prepared and certified(SCH# )
❑ The Project was encompassed by an Environmental Impact Report previously prepared for (SCH# ).
® An Addendum to the.Mitigated Negative.Declaration was prepared on December 22,2005.
Copies of the record of project approval and the Negative Declaration or the final EIR may be examined at the office of the
Contra Costa County Public Works Department.
_J The Project will not have a significant envirohmentai effect.
❑ The Project will have a significant environmental effect.
® Mitigation measures were made a condition of approval of the project.
❑ A statement of overriding considerations was adopted.
❑ Findings were adopted pursuant to Section 15091 of the State CEQA Guidelines.
Date: /� l]fo :By:
Community Development Department Representative
AFFIDAVIT OF FILING AND POSTING
I declare that on I received and posted this notice as required by California
Public Resources Code Section 21152(c). Said notice will remain posted for 30 days from the filing date. .
Signature Title
Applicant: ®County Clerk-$50
Public Works Department Total Due: $50
255 Glacier Drive Total Paid $
Martinez, CA 94553.
Attn: Leigh Chavez i l " `-- !--,-::D �� Receipt#:
' FEB 15 2006
S.L. WEIR, COUNTY CLERK
CONT C17�A Cr, LINTY
BY %'- UTY
1
ADDENDUM to the
MITIGATED NEGATIVE DECLARATION
for the Bethel Island Bridge Replacement Project
SCH# 2003082087
Project # 0662-684043.
CP# 03-36
PREFACE
The Bethel. Island Bridge Replacement Project Mitigated Negative Declaration
(MND)evaluated the proposed project which consists of replacement of the existing aging
wooden bridge with a new concrete structure according to current design standards: The
project consists of constructing a new approximately 860-fo6t long, 50=fo6t wide bridge with
two 12-foot lanes, a 12-foot left turn lane at the south end, two 5-foot shoulders, two 5-foot
sidewalks and barrier railings. Based on the increased length of the.bridge, the project
also includes constructing a raised access road between the bridge approach 'arid the
levee on the southeast side of the bridge.
This document serves as an Addendum to the Bethel Island Bridge Replacement
Project Mitigated Negative Declaration(CP#03-36; SCH#2003082087). The MND for the
project consists of the.original MND (dated July 1; 2003 and filed on November 5, 2003),
and this Addendum.
The Contra Costa Community Development Department(CDD)is the Lead Agency
for the project, and on November 5, 2003, the Board of Supervisors (Board) approved the
project and filed a Notice of Determination (NOD) with the County Clerk. .
CEQA PROCESS
The California Environmental Quality Act (CEQA) stipulates that an Addendum
(CEQA Guidelines.Section 15164) to a previously adopted MND maybe prepared if only
minor technical changes are necessary and none of th;e conditions described in CEQA
Guidelines Section 15162 have occurred:
1. No substantial changes are proposed in the project which will require
major revisions of the previous MND due to the involvement of new
significant environmental effects or a substantial increase in the severity'of
previously identified significant effects;
2. No substantial changes with respect to the circumstances under which
the project is undertaken which require major revisions of MND due to the
involvement of new significant effects or a.substantial increase in the severity
of previously identified significant effects; or
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3. No new information of substantial importance shows that the project will
have one or more significant.effects not previously discussed in the MND.
In accordance with CEQA Guidelines Section 15164(d), the Board shall consider
this Addendum along with the MND prior to making a decision on the project. According
to CEQA Guidelines Section 15164(c)an Addendum does not require circulation for public
review but can be included in or attached to the MND. As noted in the Preface, this
Addendum is attached to the MND for the Bethel Island Bridge Replacement Project (CP#
03-36, SCH# 2003082087).
EXPLANATION OF THE ADDENDUM
This Addendum to the MND,for Bethel Island Bridge Replacement Project identifies minor
technical changes in the project design.
DESIGN
The logistics associated with replacing the Bethel Island Bridge (both design and
construction) are very complicated since thE: new bridge will be constructed in essentially
the same location as.the old bridge. The bridge is being replaced in the same location
specifically to avoid major impact to the downtown Bethel Island community. In order to
allow for one lane open in each direction continually during .construction, the bridge
engineer has phased construction with the eastern half of the new bridge being constructed
during the 15t construction season (while the old bridge still carries traffic)and the western
half of the bridge being constructed during the 2nd season (once traffic has . been
transferred from the old bridge).
As a result of the complexity of the bridge replacement project, several minor
technical changes to the project analyzed by the Mitigated Negative Declaration filed on
November 5, 2003 have been determined to be necessary during detailed project design.
These minor technical changes include:two minor road detours, several utility relocations,
minor drainage improvements, and replacement of the planned mechanically stabilized
earth (MSE) wall with a new.embankment slope. These minor technical changes will
require real property transactions beyond those discussed within the November. 2063
document. Each of these additions or modifications to the previously analyzed project is
discussed below.
This Addendum is consistent with County policies and does not lead directly or
indirectly to significant physical changes in the project, nor does it alter the adequacy or the
completeness of the environmental impacts and mitigation measures identified in the MND.
Therefore, this Addendum to the MND is appropriate.
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ADDITIONS TO THE MND
This section identifies,the language which is added :and/or changed (bold:face fype) or
deleted (seeut) to the text and figures of the -MND. The environ .mental .impacts are
discussed in "Environmental Initial Study Bethel. Island Bridge Replacement Project,dated
July 1, 2003 (a ached)and filed'on November 5, 200.3. Tfie changes below pertainto the
document referenced.above.
1. Road Detours .'
Page 1, end of the 2nd Paragraph (Project'Descripfioh): In order°.to accommodate
local traffic during `construction of the pe�mane:nt Bethel Island:Road'= Wells
Road intersectiori,=.a temporary Welis'Road.detour will be constructed to:allow
traffic to travel aroun& the roadwork. The Wells Road: detour will be
approximately 1,000 feet long and 20`feet wide and Will. bei;paved to: ensure
adequate access:. The detour will be located on APN 032-112=004, b.ut it will be
constructed as close.to the intersection of Wells Road and Bethel Island Road as
possible to minimize. the.detour road's footprint on the underlying'paircel."This
..,
temporary Wells Road detour.will be removed prior fo completion of the project
and the underlying area will be returned to its ongin.al condition(level.grassland).
In addition to the Wells Road detour, in order to accommodate traffic on Bethel
Island Road while- the southern bridge abutment is being constructed, a
temporary detour road will also be constructed;along the west side of Bethel
IslandRoad. The temporary Bethel Island Road detour will be 26 feet wide and
850 feet long andwill be paved. The detour road will_be constructed on APNs
032-330-0101 032-330-027 and 032-130-022.; The detour road W�ill.be constructed
immediately adjacent .to Bethel Island Road to minimize the detour r'oad's
footprint on the underlying parcels. Similar to the Wells `Road detour;' this
temporary detour road will be removed prior to.project.completion and the area
not encumbered by permanent slope easements will be'returned to its original
condition.
Real Property transactions: will be necessary to allow for construction of both
detour roads; however, both of these detour roads will be located on parcels that
were already expected to require some level of property acquisition in' support of
the project. Real property transactions on these.:parcels were discussed in. the
MND filed in November of 2003. No new significant impacts will result.fro_ m
construction of the two temporary detour roads.:
2. Utility Relocations
Page 34, end of the 1st Paragraph (Utilities and:Service Systems): In order to clear the
work zone to `allow for construction of the new bridge, overhead electric lines .
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that are currently located on the existing bridge will require temporary relocation.
The power lines will be removed from the existing bridge and rerouted to
approximately 100' tall temporary poles that will allow the power lines to
completely span Dutch Slough. The temporary poles will be located
approximately 425' east of the existing bridge and behind both levees.Once the
new bridge has been completed, the temporary poles will be removed and the
power lines will be run permanently on the new bridge. Other utilities, including
SBC (communications) and Comcast (cable) will also be relocated to PG&E's
temporary lines to accommodate construction, and then permanently installed on
the new bridge following its completion. In addition, since the replacement
bridge will be longer than the existirig bridge, Ironhouse Sanitary District will
need to upgrade their existing.pumping:system in its existing location. The
bridge work will also necessitate Ironhouse Sanitary's installation of a new sewer
line under.the permanent access road from Wells Road to the southern levee as
well as .new sewer lines along the east and west side of the new,13:ethel Island
Road embankment and.relocation of the sewer force.main onto the new bridge.
The utility modifications.necessitated by the.bridge replacement work.wilI require
real property transactions including temporary and permanent.easements. The
utility relocations will occur in previously disturbed areas.and no new significant
impacts will occur as a result of the relocations.
3. Drainage Work
Page 12, end of the 1St Paragraph(Bioloc�ical Resources): Rather than out Ili into
the.existing drain pipe that ties into a.private drain system on the west side of
Bethel Island Road as.they currently do, flows from. the existing roadside ditch
along Wells Road(that will be culverted as a result of the project)will be rerouted
to an existing earthen drainage ditch approximately 450 feet south.of Wells Road.
Flows will be rerouted since the existing drainage system is private and isnot
adequate to handle the existing flows. In`order to ensure that the rerouted flows
do not erode the banks of the ditch at the outfall location, rock riprap will be
installed to dissipate the.energy of the flows.. Similar to the Wells Road drainage
already analyzed in the November 2003. MND, this roadside drainage ditch does
not gravity flow to Dutch Slough; instead it must be pumped to the slough.
Based on its lack of continuous,hydrology and severely degraded nature, the
drainage ditch lacks habitat value. Real Property transactions may be necessary
in support of the drainage work along Bethel.Island Road. No new significant
impacts will result from installation of the outfall.
Page 23, 4th Paragraph (Hydrology and Water Quality): As part,of the work necessary
to realign a short portion of Riverview Place to conform to the new higher grade
of.Bethel Island Road, drainage inlets will be installed that will tie to an outfall at
the.existing drainage ditch east of Rivorview Place. The drainage inlets will be
installed in an area that was already expected to be disturbed by the project.
G:\Grppata\EngSvc\ENVIRO\TransEng\Bethel island Bridge\Neg Dec Addendum.doc
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Real Property transactions may be necessary in. support of;the drainage inlet
work along Riverview Place. No new significant impacts will occur as a result of
the Riverview Place drainage inlet work.
4. Embankment Slope
Page 1, end of 2nd Paragraph (Project Description): The e::+.e^rged.1e^r9+h ^f+ho.F,ririnc
hr eaf feet aleng the southwest GGFRGr of the r,rr�;^,.+ +o The extended length of the
bridge will also require construction of a 2:1 embankment fill slope along the
southwest corner of the site rematching the slope design on the east side of Bethel
Island Road. Permanent-real property acquisitions will be necessary in support
of this work.
Page 7,'3d Paragraph .(Aesthetics): T#e-e� eided-deng# -e# �+ ;� -rII r^,;r r;r
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the wall will be lGGated adjaGeRttetwe existing bu�inesl§,06
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extended length. of the ' bridge will require co'nstr'uction. of an eaIrthen -
embankment at a 2.:1 slope-on the southwest corner of the project site. This
embankment.slope solution is a simpler and. less expensive approach than the
mechanically stabilized earthen wall originally ,planned for this location_ ' In
addition, the earthen embankment will match the design on the southeast side of
the roadway, making it a more uniform solution than the MSE wall originally
proposed and analyzed in the November 2003 MND. The embankment will start
approximately 250 feet south of the southern levee and extend to approximately
700 feet south of the levee. The embankment. is. not expected to' have a
significant. aesthetic impact based on 'a number of factors,`including: 1).the
embankment will be a gently sloping earthen berm covered in hydroseeded
grasses, 2) the embankment will be located adjacent to two businesses (rather
than residences), 3) the business located at the tallest point of the embankment
does not have any windows facing the roadway, 4) based on the current location
of boat storage', the view of the .embankment will be partially covered by
stationary boats.
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Real Property transactions will be necessary to allow,for construction_ of the
embankment; however, the embankiinent will be located on parcels:th'at were
already expected to require some level of property acquisition in support of the
project. Real property transactions on these parcels were discussed in the MND
filed in November of 2003. No new significant impacts will result from
construction of the,embankment.
5. Levee Work
Page 14, new 4th Paragraph (Biological Resources): At the request of Reclamation
District 799 (RD799), steel sheet piliing'will be installed vertically through the
center of the existing southern levee beneath the location of the new bridge. The
County has agreed to incorporate this work into the bridge construction contract
on behalf of.RD799. The Reclamation District made this request based on their
long term goal to install sheet piling along all of their. levees. Because. the
presence of the new longer bridge prE�vents the use of tall sheet pile drivers; the
sheet piles will be installed before the! new bridge is installed. This sheet piling
work will occur entirely outside of the. slough and.. will have no 'impact on
biological:resources.in the area.
Additionally, at the request of.RD799, 1the ex.istirig concrete bridge abutment will
be partially removed and rock slope protection will be installed on the bank.of the
.
levee to the high tide line. All work.associated with the partial abutment,removal
and :bank protection will occur outside of the:slough, and the avoidance and
minimization measures.already analyzed in the MND filed.in.November 2003 will.
ensure that potential impacts to water quality and biological resources are
avoided and minimized. No new biological impacts are'expected as a result of
this additional work on the levee. All necessary regulatory permits will be
obtained for the project prior to initiation of construction.
. .Page 28, new paragraph (Noise): The pile.driving associated with installation of
the sheet piles within the RD799 levee will be brief in duration and: is .not
expected.to add significantly to the noise impacts associated with the project.
The sheet piles that will be installed sunder the location of the new bridge are
narrow. plates of.steel.that will be driven by press-in method,which is a quieter
installation method than traditional pille driving. The sheet piles are shallow in
depth and will be installed over.a short distance (approximately 80 feet). Based
on the shallow depth, short installations distance, and comparatively quiet press-
in installation method, noise impacts a:>,well as vibration impacts associated with
the sheet pile driving are expected to be negligible.
Figures section: Figure 5 identifies the locations of the two new detour roads and
PG&E utility pole relocation.
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CONTRA COSTA COUNTY ADDENDUM FINDINGS for the
MITIGATED NEGATIVE DECLARATION for
BETHEL ISLAND BRIDGE REPLACEMENT PROJECT .
The following information is added to.the previous MND and is presented to comply with
Section 15091 of the CEQA Guidelines for the MND for the Bethel Island Bridge
Replacement Project
1. Environmental Effect: Modifications to the design section as described in this
Addendum, are minor technical changes or additions to the project and will not
result in any additional environmental effects not previously discussed.
Findings: There.are no significant environmental impacts associated with the
minor,technical changes or additions for the proposed activity for.which this
Addendum was prepared.
Statement of Facts:
a. The project to be developed pursuant to this Addendum to the MND for the
Bethel, Island Bridge Replacement Project is substantially similar to the project
analyzed in the MND.
b. The MND for the Bethel Island Bridge Replacement Project consists of the MND,
comments received, responses to the comments raised, and this Addendum. The
MND was completed in compliance with CEQA.
c. There are no substantial changes, pursuant to.CEQA Guidelines Section 15162
(a)(1), in the project that require major revisions of the MND due to the involvement
of new significant environmental effects or.a substantial increase in the severity of
previously identified significant effects. The project is substantially similar to the
project analyzed in the MND.
d. There are no substantial changes with respect to the circumstances, pursuant to
CEQA Guidelines Section 15162 (a)(2), under which the Bethel Island Bridge
Replacement Project is undertaken which require major revisions of the previous
MND due to the involvement of new significant environmental effects or a
substantial increase in the severity of previously identified significant effects. Those
circumstances remain substantially similar to the circumstances analyzed in the
MND.
e. There is no new information of substantial importance, pursuant to CEQA
Guidelines Section 15162 (a)(3), which shows that the project will have one or
more.significant effects not previously discussed.in the MND.
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f. None of the conditions calling for the preparation of a subsequent or
supplemental EIR have occurmd (see items 1 c e above). Therefore, it is
appropriate to adopt this Addendum to the MND to make the minor technical
changes and additions discussed in this document (CEQA Guidelines 15164).
This Addendum shall be considered along with the MND prior to the Board
making a decision on the minor technical changes or additions to the project,
and in considering these changes or additions, the Board is considering the
identical or substantially similar underlying project.
The findings are supported by substa.ntial evidence in the administrative record and are
based on the MND for the Bethel Island Bridge Replacement Project,which was subject to
public review.
In accordance with CEQA Guidelines Section 15164(d), the County Board of Supervisors
shall. consider this Addendum along with the MND prior to making a decision on the
project. According to CEQA Guidelines Section 15164(c) an Addendum does not require
circulation for public review but can be included in or attached to the MND. As noted in the
Preface,this Addendum is attached to the I\AND for the Bethel Island Bridge Replacement
Project (CP# 03-36; SCH# 2003082087).
LC:
G:\GrpData\EngSvc\ENVIRO\TransEng\Bethel Island Bridge\Neg Dec Addendum.doc
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CONTRA PUBLIC WORKS DEPARTMEN :T ..
COSTA INITIAL STUDY
COUNTY OF ENVIRONMENTAL SIGNIFICANCE
PROJECT # 0662-6R4043
CP# 03-36
PROJECT NAME: Bethel Island Bridge Replacement Project
PREPARED BY: Leigh Chavez DATE: July 1, 2003
APPROVED BY: let f C _ DATE:
RECOMMENDATIONS:
() Categorical Exemption (Class ) ( ) Negative Declaration
( ) Environment Impact Report Required ( X ) Mitigated Negative Declaration
The project will not have a significant effect on the environment. The recommendation is
based on the following: There is no substantial evidence that the project or any of its aspects may
cause a significant effect on the environment (Sec. 15063(b)(2)).,
What changes to the project would mitigate the identified impacts: N/A
USGS Quad Sheet:. Jersey Island Base Map Sheet:#: F27Parcel# N/A
GENERAL CONSIDERATIONS:
.1. Project Description: The Contra Costa County,Public Works Department is proposing to
replace the Bethel Island Bridge, located in the east Contra Costa County area (Figures 1,
.2). The bridge has been categorized as "functionally obsolete" by Caltrans and the.
replacement has been determined to be necessary in order to replace the aging wooden
structure with a new concrete structure according to current design standards. The existing
bridge, built in 1948.is 460 feet long and 28 feet wide. It consists of a concrete deck over a
wooden substructure containing 25 bents. The bridge currently has- two 11-foot lanes, two
narrow sidewalks, and no shoulder area.
The project consists of constructing a new approximately 800-foot long, 50-foot wide bridge
with two 12-foot lanes, a 12-foot left turn lane at the south end, two 5-foot shoulders, two 5-
foot sidewalks, barrier railings and a pedestrian staircase. Based on the increased length of
the bridge, the project also includes constructing a raised access road between the bridge
approach and the levee on the south side for general and emergency access. The extended
length of the bridge will also require construction.of a wall varying in height from 2 to 25 feet
for roughly 450 linear feet along the southwest corner of the project site.
Support piles for the new bridge will be installed within the slough, beyond the south levee,
and in the north levee. Although design of the- replacement bridge requires that the new
bridge be longer and wider to accommodate .current design standards,:the bridge has been
designed specifically to avoid major impact to the downtown Bethel Island community by
locating the new bridge in essentially the same location as the old bridge. Figure 3 delineates
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CALIFORI ENVIRONMENTAL QUAL17 . ACT
NOTICE OF DETERMINATION JAN 1
CONTRA COSTA COUNTY COMMUNITY.DEVELOPMENT DEPARTMEW , ;.;�
�,m.�jrNEe: L
651 PINE STREET 4TH FLOOR NORTH VYING .: MARTINEZ, CALIFORNIA
Telephone: (925)313-2296 Contact.Person: .Cece Seligren, Environmental Planner
Project Description, Common Name (if any).and Locati.on:.BetheI Island Bridge Replacement Project,County File#CP 03-36:Project
Description: The Contra Costa County Public Works Department is proposing to replace the Bethel Island Bridge, located in the east Contra
Costa County area. The bridge has been categorized as"functionally obsolete"by Caltrans and the replacement has been determined to be
necessary in order to replace the aging wooden structure with a.new concrete.structure according to current design standards..The project
consists of constructing a new approximately 800-foot long,50-foot wide bridge'with two 12-foot lanes,a 12-foot left turn lane 6t the south end,
two 5-foot shoulders,two 5-foot sidewalks,barrier railings and a pedestrian staircase. The project also includes constructing a raised access
road between the bridge approach and the levee on the south side for geneeal arid emergency access. The extended length of the bridge will
also require construction of a wall varying in height from 2 to 25 feet for roughly 450 linear feet along the southwest cornea of the.project site.
Support piles for the new bridge will be installed within the slough, beyond the south levee, and in the north levee. Although design of the
replacement bridge requires that the new bridge be longer and wider to accommodate current design standards,the bridge has been designed
specifically to avoid major impact to the downtown Bethel Island community by locating the new bridge in essentially the same location as the
old bridge.Construction of the bridge will occur over two construction seasons. The eastem half of the bridge will be constructed during the 151
construction season and.the western half of the bridge will be,constructed during the 2";d season. In order to ensure adequate emergency
access during construction, the bridge engineer has designed the construction phasing to accommodateone lane open in each direction
continually during construction. In order to construct the new bridge,property acquWtiori,.is required including partial parcel acquisition,slope
easements,and temporary construction easements in the vicinity of the project. Relocation of residential and business occupants may also,be
required. The project may also require conforming and/or relocation of several driveways.Several boat slips'on the northeast side of the bridge
may be located outside of the road right of way in an area necessary for bridge construction. If the slips are impacted by the project,the County
will relocate the boats and offer to rent the spaces from the slip rental business. Real Property transactions necessary to construct the
replacement bridge may affect a number of parcels including: APN 031-091-011,APN 031-093-034,APN 031-093-027,APN 031=093=028,
APN 031-093-018,APN 031-093-025,APN 031-093-026,APN 031-093-035,APN'032-140-015,APN 0321140-012,APN 032-330-010,and
APN 032-112-004. Driveway conforms may be necessary on APN 032-130-022; APN 032-330-027 and APN 032-330-010. In addition,
following completion of the project,further real property transfers,such as dispensation of surplus.property,may occur. Project Location: The
project is located along Bethel Island Road over Dutch Slough in the east Contra Costa County area. Bethel Island Road is the only access to
Bethel Island.
The project was approved on:
Pursuant to the provisions of the California Environmental Quality Act:
( ) An Environmental Impact Report was-prepared and certified (SCH# )
( ) The Project was encompassed by an Environmental Impact Report previously prepared
for (SCH# )..
( X ) A Mitigated Negative Declaration was prepared following identification of a potentially significant impact
Copies of the record of project approval and the Negative Declaration or the final EIR may be examined at the office of the Contra Costa
County Community Development Department..
(' X ) The Project will not have a significant environmental effect with incorporated.mitigaf TTrmasu
( ) The Project will have a significant environmental effect. j—I
( ) Mitigation measures were made a condition of approval of the project,
A statement of overriding considerations was adopted.
4
( ). I k
( ) Findings were adopted pursuant to Section 15091 of the State CEOA Guidelines:
JFDiL-r
Date: I�" y"�' By: <--�—�
Community Development Department Representative g
I S.L.-WEIR, COUNi CLERK
NTRAFFIDAVIT OF FILING AND,POSTING a' �''
NOV 05 2003 BY : PUTY
I declare that on I received and posted this no ice
California Public Res urces Code Section 21152(c). Said notice will remain posted for 30 days from the filing
dato /
DEPUTY COUNTY CLERK
Signature Title
Applicant:
Public Works Department Department of Fish and Game Fees Due: Total Due: $
255 Glacier Drive Y. Neg Dec-$1,250 Total Paid $
Martinez,CA 94553
Attn:Leigh Chavez X County Clerk-$50 Receipt#:
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October 22, 2003
Page Three
Comment 4: The design of the bridge with a .pedestrian walkway on• both sides of the bridge is
consistent with the current design standards specified by Caltrans. Although pedestrian use is
not particularly heavy on the bridge, Bethel Island Road is fairly heavily traveled during .the
summer months, particularly on weekends and holidays; therefore, the bridge has been
designed with two walkways to limit the need for pedestrians to cross Bethel Island Road.
Comment 5: The new bridge will have a' vertical navigational clearance of 19.5 feet above
mean high water and 23 feet above mean low water. This is an increase of approximately-3:5
feet above the existing bridge. ,The bridge will also have a horizontal clearance of
approximately 78 feet, which is considerably wider than the existing width of 36 feet. The Coast
Guard has agreed the proposed navigational clearances "meet the reasonable needs of vessels
operating on the waterway". Any additional increase ih.vertical navigational clearance'would
result in substantial increase in cost of the replacement structure.
Comment 6: In order to minimize traffic impacts during construction, the bridge engineer has
designed the construction phasing to accommodate one lane open in each direction continually
during construction. There is a limited potential for infrequent and brief lane closures for short
distances on a sporadic and as-needed basis; however, these closures would only occur on one
lane at a time, on weekdays, and during the middle portion of the day. These potential closures
would be similar to any temporary closures due to a general construction project and are not
expected to cause significant traffic delays. Rega'rdiess of project phasing and current.
construction stage, one lane in each direction will always be open. at the end of every
construction day as well as .on weekends and holidays; therefore, traffic impacts as a result of
construction activities are expected to remain at a level that is less than significant.
I hope this letter addresses your concerns. The project is currently scheduled to be heard by
the County Board of Supervisors on November 4, 2003. Neil Leary, the project engineer, will
contact you in the near future to discuss the project. You may contact me at (925) 313-2366 or
lchavez5pw.co.cohtra-costa.ca.us or Neil Leary at (925) 313-2278 or nleary(a>pw.co.contra-
costa.ca.is if you have questions regarding the project. Thank you.
Sincerely,
Lei havez
Planner III
Engineering Services
LC:gpp
G:\GrpData\EnoSvc\ENVIRO\2000.projects\Bethel Island Bridge\D'AnnaResponse.doc
cc. N. Leary, Design
S. Fernandez, Transportation
E.Whan, Engineering Services
C. Sellgren, Engineering Services
Mr. Wayne D'Anna
October 22, 2003
Page Two
activities. The estimated number of days for the second construction season will be
approximately 10 — 15 days with similar conditions (e.g., multiple and lengthy breaks between
pile driving activities). Since the actual time necessary to drive each individual pile is 'brief, no
pile driving will need to occur at night, on weekends or on holidays. Contract specifications will
require notification via signage of expected pile driving occurrences.
Comment 2: The displaced bed material that is removed from the bridge pilesduring the. pile
driving operations will be used on the project site in areas that require fill. Although this fill
material may be temporarily stockpiled in the project area until the ultimate fill location(s)--is
adequately prepared, the stockpiles will be carefully maintained and monitored to ensure wind
erosion and dirt-tracking does.not occur. Any permanent fill placed in or near your property will
be covered with asphalt paving materials or. rE!vegetated with hydroseeding and/or erosion
control blanketing.
Currently the two D'Anna Yacht Center boat slips that are closest to the existing bridge
encroach into County road..right of way. Following adoption of the California Environmental
Quality Act (CEQA) and National Environmental Policy Act (NEPA) documents for the project,
staff from the County's Real Property Division, will be in contact with you regarding this
encroachment, as well as obtaining temporary easements for the project conforms t.o your
parcels along Bethel Island Road north of the bridge.
Comment 3: According to the Department's bridge consultant, Mr. Nygaard, the pile driving
activities are expected to have a negligible impact on surrounding structures. Per Mr. Nygaard,
pile driving effects rarely extend beyond the ac,ual impact area due to inefficient transfer of
force through soil. In addition, since the bridge pilings will be driven as shells, vibration
associated with the pile driving will be minimized relative to the vibration'associated with driving
a solid pile (i.e., there is less material to displace). Nevertheless, in order to further minimize
the potential vibration. associated with pile driving activities in the slough, construction will
include preliminary placement of oversized hollow steel columns on the bed of the slough at
each pile location. These steel columns will be sized to extend from the bed of the slough to the
water line. Once the steel columns are lowered into place, they will be dewatered and the steel
shell piles will be driven in the ciewatered column. The dewatered area surrounding the steel
piling shell will provide a buffer, effectively isolating the work activity from the water in the slough
and minimizing the percussion and vibratory effects experienced in the slough and surrounding
areas as a result of the pile driving.
In addition, according to Mr. Nygaard, vibration due to vehicles using the new bridge is expected
to be minimal. The existing Bethel Island Bridge has shallow pilings that transfer vibrations
resulting from vehicles fairly effectively. However, the new bridge will have larger and
considerably deeper pilings. Based on the size and depth of the pilings, vibration due to vehicle
traffic on the bridge is expected to be less than currently exists even though the new bridge will
be moved closer to the D'Anna Yacht Center.
0
0
Contra Public Works Department Maurice M.Shiu
Public Works Director
Costa 255 Glacier Drive R.Mad,Avalon
County Martinez, CA 94553-4825 Depury Director
Telephone: (925)313-2000
Julia F.Bueren
FAX (925)313-2333 Deoury Director
Wei;site: wv.,w.co.contra-costa.ca.us/cieoart/i)w
October 23, 2.003 Patricia R.McNamee
Devuiy Director
Mr. Wayne D'Anna
D'Anna Yacht Center, Inc.
B.I. Marina Resort
6050 Bethel Island Road
P.O. Box 1870
Bethel Island, CA 94511
Our File: Bethel Island Bridge Replacement Project
Project Number: 0662-684043
Dear Mr. D'Anna:
Thank you for your comments on the Bethel Island Bridge Replacement Project Mitigated
Negative Declaration (CP#03-36). The Contra Costa County Public Works Department
(Department) received your comment letter via fax on October 20, 2003. 1 have divided your
comments into seven separate items in an effort to ensure each of your comments is addressed
(please see your attached letter with comment numbers noted in the margins). Following are
responses to your comments:
Comment 1: Standard dust control and erosion control practices, including, but not limited to,
general watering of exposed areas and/or use of chemical stabilizers will be adhered to ouring
construction. These control measures will minimize the potential for wind erosion.as a result of
exposure due to grading and associated construction activities. These measures will be
incorporated into the construction contract and will be monitored during construction to ensure
they are implemented effectively. In addition, a Stormwater Pollution Prevention Plan (SWPPP)
will be prepared by the contractor and accepted. by the Department prior to . project
implementation. The SWPPP will address a number of issues including construction generated
dust and dirt-tracking on roadways. Implementation of the SWPPP and other good-
housekeeping measures required by the contract plans and specifications will maintain a clean,
debris and dust-free environment in the project area.
Contract specifications will also require the use of properly tuned and muffled equipment to
minimize noise generated as a result of construction. Working hours will be limited to 7:00 a.m.
to 7:00 p.m. Monday through Friday, and 9:00 a.m. to 7:00 p.m. on weekends and holidays in
order to limit noise disturbance during sensitive hours. These working hours will be strictly
adhered to unless modified following written approval by the resident engineer and appropriate
notification of nearby property and business owners. The working hours will be incorporated as
part of the construction contract.
Pile driving activities are expected to be staggered over multiple, often non-consecutive days
rather than being conducted in a concentrated and intensive effort. The set up time for each
individual pile is lengthy, so there will be relatively long breaks between individual pile driving
events.. The estimated number of days with pile driving during the first construction season will
be approximately 15 — 20 days with multiple and lenothy breaks every day between pile driving
Ronald Keil .
' 1741 Carl Road
Rescue, CA 95672-9604 RF7�17..F 4.77-Q
1 Q�, 530-672-4222
Imo'
ro nker ledrrecway.com SEP 1 0 2003
September 3, 2003
ENVIRONMENTAL
Contra Costa County Public Works Department
Attn: Environmental (ORG 4523)
255 Glacier Drive
Martinez, CA 94553.
Re: County file # CP 03-36 or parcel # 030 020 043
Dec:r Gentlepersons:
We own property on 4238 Stone Road, Bethel Island and have been notified
of the Bethel Island Bridge Project. The notice was sent to our old address.
We have moved from our old address at
3758 Rosemar Ave
San Jose, CA 95127
Please send any future correspondence -to us at our new. Rescue address
indicated above.
Sincerely,
Ronald Keil
• — _ I' :� any / l \ .. .. v
DX
YACHT CENTER, INC
--- _
September 22, 2003
Leigh Chavez, Planner III
Contra Costa County.Public Works Department
255 Glacier Drive
Martinez, Ca. 9.4553
Dear Mr. Chavez,
I am the managing o er of the properties at 6050 Bethel Island Rd. We are at the base of the:curren
Bethel Island Bridge I am concerned about the impact to our business with the new bridge proposal
coming within severe feet of our salesriding. 1 am c cemed that the dirt, residue and noise from the
project will efie-clivety close our business Furthermore we would have fill coming from the piles being.
driven in the surrounding areas close to our marina. Is a plan In place to make sure that this fill Is o?
removed from our area? We display new,yechts in this area and it would be very difficult at best to keep
them clean during conslruelion and with the bridge coming so close to us I em concerned for the for g-
term impag
Darn also concerned that the bridge being.so. close to our buildingwould destabilize our current structure
and possibly render it unusable.We would have significant vibration with every.vehicle crossing the
bridge. Perhaps a plan to move our sales building to at least a position away from the new:bridge that Is
equal to the distance that v✓ecurrently heve'would be a potential solutio
CD7oes the bridge have to have two walkways.? I do not know why two walkways would be necessary +1,=
considering that there is not much for people to walk to on both sides of the roadwe�Ell also would like to
make sure that a new bridge would be tell enough.to have normal height vessels able to go under it(g)
Mavessels today have 22'-24' high.fly bridges and it would be good to accommodate them for the
future This may also make it possible to build the new bridge over the exisling one to eliminate the down,
time for traffic during construction. Has this been considered'
I would like to have a meeting fo discuss the Impact that a new, wider bndge'would have-on the viability
of our business. Please call me at 510 262-8255 to set up a convenient time to meet.
I appreciate your.attention 10 this matter.
Si cerely,
I D'.SZ. •
Wayne Anna
President 8 managing property owner
Cc: Emest Piervcci, esq.:
O OAKLAND Phone 510-451.7000, Fax 510.451.7026 Oakland Estuary, 11 Embsrcedero West, Suite 100, Oakland, CA 94607
0 EETHE_ ;SLaNC Phone 925.684•3720. Fax 925•684•90716.1. Marina Resor,, 6050 Belnel Island Rd., Box 1870, Bethel IslanC,CA 9461';
STATE OF CALIFORNIA—BUSINESS TRANSPORTATION AND HOUSING AGENCY GRAY DAVIS Governor
DEPARTMENT OF TRANSPORTATION
P. O. BOX 23660
OAKLAND, CA 94623-0660
(510) 286-4444
510 286-4454 TDD Flex yP�er,
( ) Be en�vrn a t!
Win.,
September 18, 2003
CC004729
CC 4-R34.92
SCH2O03082087
Ms. Leigh Chavez, Planner ID
Contra Costa County Public Works Department
255 Glacier Drive
Martinez, CA 94553 .
Dear Ms. Chavez:
Bethel Island Bridge Replacement Project— Initial Study/Mitigated Negative Declaration
Thank you for including the California Department of Transportation in the environmental review
process for the proposed project. We have exarnined the Initial Study/ Mitigated.Negative
Declaration and -are satisfied that the project will not have a significant impact to State
transportation facilities.
Should you have any questions regarding this letter; please call Lisa Carboni of my staff at (510)
622-5491.
Sincerely,
iTIMOTHY SABLE
District Branch Chief
IGR/CEQA
c: Scott Morgan (State Clearinghouse)
'Caltrans improves mobdti y across California'
e
In accordance with the recommendations in the Phase H Environmental Site Assessment,petroleum
impacted soils will be properly segregated and managed, a Certified Industrial Hygienist will be
retained to prepare.a Lead Compliance Plan to be implemented during construction, an asbestos
containing material and lead based paint survey will be conducted by the CIH and if these materials
are present,they will be handled appropriately, and any timber sections that will be removed will be
transported to and disposed of at a local landfill that is permitted to accept chemically treated wood
products.
The project does not have the potential to eliminate important examples of the major periods of
California history or prehistory; not will the project have cumulative, direct or indirect effects that
could cause substantial adverse effects on human beings. The project will replace a functionally
obsolete bridge with a new structure according to current design standards.
g\enviro\2000Projects\Bethe Us land\NEGDEC
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 36 of 36
f
Potentially
Significant
Potentially Unless Less than
Significant Mitigation Significant No
IMD2Ct Incorporation Impact Impact
h'VIl. MANDATORY FINDINGS OF SIGNIFICANCE .
a. Does the project have the potential to degrade _ x
the quality of the environment, substantially
reduce the habitat of a fish and wildlife species,
cause a fish or wildlife population to drop below
self-sustaining levels,threaten to eliminate a
plant or animal community,reduce the number
or restrict the range of a rare or endangered
plant or animal or eliminate important examples
of the major periods of California hista.ry or
prehistory?
b. Does the project have impacts that are indiv- — _ X _
idually limited,but cumulatively considerable?
("Cumulatively considerable"means that the
incremental effects of a project are considerable
when viewed in connection with the effects of
past projects, the effects of other current projects,
and the effects of probable future projects)?
C. Does the project have environmental effects _ — x _
which will cause substantial adverse effects on
human beings, either directly or indirectly?
SUNIMARY: The project does not have the potential to impact the quality of the environment,
substantially reduce the habitat of a fish or wildlife: species, cause a fish or wildlife population to
drop below self-sustaining levels, threaten to eliminate a plant or animal community, reduce the
number or restrict the range of a rare or endangered plant or animal. 1n order to ensure impacts to
sensitive biological resources are minimized, the pilings will be driven only after establishing a
buffer zone between the active work area and the water in the slough. This buffer zone will
minimize the percussion and vibratory effects experienced in the slough and surrounding areas. In
addition, to avoid potential impacts to sensitive species, all in-water work will be limited to the
summer and fall months of anygiven year; and during pile driving activities contract specifications
will require the installation of silt trapping devices of the contractor's design to ensure that siltation
in the slough is kept to a minimum. The five native trees that will be removed in order to implement
the project will be replaced at a 2:1 ratio and maintained for three years to ensure successful
establishment.
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 35 of 36
Potentially
Significant
Potentially Unless Less than
Significant Mitigation Significant No
Impact Incorporation Impact impact
t
XVI. UTILITIES AND SERVICE SYSTEMS -
Would the project:
a. Exceed wastewater treatment requirements _ _ X
of the applicable Regional Water Quality
Control Board?
b. Require or result in the construction of new _ _ _ X
water or wastewater treatment facilities
or expansion of existing facilities,the
construction or which could cause significant
environmental effects?
C. Require or result in the construction of new _ _ _ X
storm water drainage facilities or expansion
of existing facilities, the.construction of which
could cause significant environmental effects?
d. Have sufficient water supplies available to _ _ _ X
serve the project from existing entitlement
and resources, or are new or expanded
entitlement needed?
e. Result in-a determination by the wastewater _ _ _ X
treatment provider which serves or may serve
the project that it has adequate capacity to serve
the project's projected demand in addition to the
provider's existing commitments?
f. Be served by a landfill with sufficient _ _ _ X
permitted capacity to accommodate the
project's solid waste.disposal needs?
g. Comply with federal, state and local statutes _ _ _ X
and regulations related to solid waste?
SUMMARY: No Impact. The existing sanitary sewer force main as well as overhead electrical,
phone and cable utilities will be relocated to the new bridge structure. All utility relocation will
be conducted in coordination with the appropriate utility companies. In addition the contractor
will be required to contact Underground Service Alert (USA) prior to initiating construction to
ensure no construction activities will come in contact with utilities.
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page.34 of 36
Will provide access to the south levee. From the south levee motorists may access the area west
of the bridge via the levee under the bridge and the, area east of the bridge via the levee road.
Based on the fact that access to businesses near the south levee is characterized by inadequate
site distance with rapidly oncoming traffic, the proposed access will actually be beneficial to
these businesses (particularly the boat storage facility since customers currently have to negotiate
the difficult left turn across oncoming traffic, often while towing large boat trailers).
In order to ensure adequate emergency access during construction, the budge engineer has
designed the construction phasing to accommodate one lane open in each direction continually
during construction. There is a limited potential for infrequent and brief lane closures for short
distances on a sporadic and as-needed basis; however, these closures would only occur on one
lane at a time, on weekdays, and during the middle portion of the day. These potential closures
would be similar to any temporary closures due to a general construction project and are not
expected to cause significant traffic delays. Regardless of project phasing and current
construction stage, one lane in each direction will always be open at the end of every construction
day as well as on weekends and holidays.
On the northeast side of the bridge, the access into the D'Anna Yacht Sales.will be raised
slightly, and, if determined to be necessary during 1he design process, access may be,provided off
of Riverside Drive rather than directly from Bethel Island Road. This shift in access will require
customers to travel less than 70 additional feet in order to turn the comer onto Riverside Drive
which is not a significant impact to traffic patterns in the area.
Based on the length of the bridge, one business located on the southwest side of the bridge will
require a driveway relocation (APN 032-330-010). The relocation will entail moving the access
farther south by approximately 150 feet. The new driveway location will provide essentially.
identical access, it will simply be shifted from the north end of the property to the south end.
No parking will be removed by the project. In addition, the parking located at the business
immediately southwest of the bridge will actually be more convenient since customers will no
longer be forced to back into oncoming, rapidly-moving traffic in order to access Bethel Island
Road. Instead they will utilize the newly provided ;access under the bridge.
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 33 of 36
Potentially
Significant
Potentially Unless Less than
Significant Mitigation, Significant No.
Imp2Ct Incorimoration Impact Impact
XV. TRANSPORTATION/TRAFFIC -.Would
the project:
a. Cause an increase in traffic which is _ X
substantial in relation to the existing traffic
load and capacity of the street system (i.e.,
result in a substantial increase in either the
number of vehicle trips, the volume to capacity
ratio on roads, or congestion at intersectionsp'•
b. Exceed, either individually or cumulatively, _ _ X _
a level of service standard established by
the county congestion management agency
for designated roads or highways?
C. Result in a change in air traffic patterns, _ _ X
including either an increase in traffic levels
or a change in location that results in substantial
safety risks?
d. Substantially increase hazards due to a design; _ _ X.
feature (e.g'., sharp curves or dangerous inter
sections)or incompatible uses (e.g., farm
equipment)?
e. Result in inadequate emergency access? _ X
f. Result in inadequate parking capacity?
g. Conflict with adopted policies,plans, or _ X
programs supporting alternative transportation i
(e.g., bus turnouts, bicycle racks)?
SUNUyIARY; Less Than Significant Impact. There will be no.substantial increase to the width.of
the roadway, therefore, the project will not increase the capacity of Bethel Island Road, nor will it
increase traffic on Bethel Island Road. Although there will be additional traffic generated ':bv
construction of the replacement bridge due to construction vehicles,the traffic-will be temporary and
minor in nature.
In order to provide emergency egress:above the one hundred year flood elevation, the project
includes constructing a raised access road between the bridge approach and the levee on the
southeast side. This road will function as both general and emergency access.to and from the .
southern levee and to and from properties that access off the south levee. This modified access
will allow customers and residents to turn off Bethel Island Road and onto an access road that
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 32 of 36
periodic maintenance of road improvements will continue to be performed by the County.
Potentially
Significant
Potentially Unless Less than
Significant Mitigation Significant No.
Impact Incomotation Impact Impar
XIV. RECREATION -
a. Would the project increase the use of _ X
existing neighborhood and regional parks
or other recreational facilities such that
substantial physical deterioration of the
facility would occur or be accelerated?
b. Does the project include recreational _ — _ X.
facilities or require the construction or
expansion of recreational facilities which
might have an adverse physical effect ol'i
the environment?
SUMMARY: Less Than Significant Impact. The County Resource Mapping System and the
field reviews did not identify any recreational opportunities in the immediate project area.
However; the Delta is heavily used by fishing and boating enthusiasts. Minor,delay in access to
these recreational areas may occur due to typical construction activities; however, the delay will
be less than significant since two lanes will remain open for traffic.
Installation of the replacement bridge will not have a significant impact on recreational boating
activities, since the bridge is already in place and the new bridge will have a higher clearance and
a much wider navigation opening than the existing 7b ridge. The navigation opening will be open
throughout the project with only short temporary closures during girder installation. During
these closures, flaggers will be on-site to direct boa.:,traffic.
Bethel Island Road is categorized as a combination trail (primary bike path and riding trail)in the
County.Resource Mapping System, however, the construction of the replacement bridge will
continue to allow for access to these activities: with the widened shoulders, the bike and,
pedestrian traffic will be more easily accommodated.
The General Plan notes the proposal for a neighborhood park and community park in the vicinity
of the bridge. The replacement project will have no impact on the properties proposed for use as
parks nor on the ultimate installation and utilization of the parks.
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 31 of 36
a
Potentially
Significant
Potentially Unless less than
Significant Mitigation Significant No
Impact Incorporation Impact Impact
I. Fire Protection? _ _ X
2.' Police Protection? _ X _
3. Schools? _ X
4. Parks? _ —7 _ X
5. Other Public facilities? X
SUMMARY: .Less Than Sigrlific.ant'Impact. The.project is located within the Bethel Island .
County Fire Protection District. The Bethel Island.County Fire Protection District.serves as both
the on and off-island fire protection district. The closest off-island fire:station is located in the
Town of Knightsen. There is a fire station located approximately 0.5 mile from the bridge on
Bethel Island. The project is located within the Oakley Union School District and the Liberty..
Union High School District.
In order to accommodate the fire district's request to have access to both levees in the case of a
levee breach, the project includes constructing a raised access road between the bridge approach
and the levee on the southeast side: This road will function as both general access to the
southern side.of the bridge and emergency access to.the southern levee.. The fire district is.aware
of the proposal to modify access to the southern levee and their minor concerns will be
accommodated within the bridge design. The fire district has indicated that they are pleased the
bridge is scheduled to be replaced with a bridge that meets current design standards (letter'to Bill
Fernandez from Fire.Chief David Wahl, Bethel Island Fire Protection District, July 21, 1998).;
In order to ensure adequate emergency access during construction, the bridge engineer has
designed the construction phasing to,accommodate one lane open in each direction continually
during construction. There is a limited potential for infrequent and brief lane closures for short
distances on a sporadic and as-needed basis; however, these closures would only occur on one
lane at a time, on weekdays, and during the middle portion of the day. These potentia] closures
would be similar to any temporary closures due to a. general construction project and are not
expected to cause significant traffic delays. Regardless of project phasing and current
construction stage, one lane in each direction will always be open at the end of every construction
day as well as on weekends and holidays. :.
Once construction is complete, the replacement bridge is expected to have a positive impact on
police and fire response times based on the slightly wider lanes and shoulder areas. In addition,
once constructed, the new bridge will not increase the.need.for fire or police protection, schools,
parks or other governmental services. The County currently maintains Bethel Island Road and
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 30 of 36
property and will likely be impacted by the project. The four residences are currently occupied
by renters. If relocation of the occupants is required, the County's Relocation Assistance Program
will provide the necessary assistance to allow the households to secure comparable, decent, safe
and sanitary replacement housing in the area pursuant to the Federal Relocation Act. The
assistance will include.help finding and securing replacement housing, rent differential payments
and moving cost reimbursement. A Relocation hr.)pact Study (RIS) that included a survey of
available homes in the area was conducted for the project. The RIS concluded that there is a
sufficient supply of replacement housing available each month for the residential occupants in
the area to accommodate the needs of the up to four households potentially being displaced.
Construction of new housing is not expected to be:necessary in order to relocate the displaced
tenants. In addition, three businesses on this same property may require relocation. The
County's Relocation Assistance Program will provide for the reimbursement of compensable,
actual, and reasonable moving costs related to relocating to a new site pursuant to the Federal
Relocation Act. Several boats slips on the northeast side of the bridge may be located outside,of
the road right of way in an area necessary for bridge construction. If the slips are impacted by the
project, the County will relocate the boats and offer to rent the spaces from the slip rental.
business.
In order to conform the new bridge to existing grade, the project may require slope easements
and temporary construction easements on a number.of parcels including: APN 031-091-01 1,
APN 031-093-034, APN 031-093-027, APN 031-093-028, APN 031-093-018, APN 031-093-
025, APN 031-093-02.6, APN 031=093-035, APN 032-140-015, APN 032-140-012, APN 032-
330-010, and APN 032-112-004. Driveway conforms may be necessary on APN 032-130-022,
APN 032-330-027 and APN 032-330-010. In addition, a temporary construction easement.will
be required on the northeast quadrant of the bridge in the waterway along several boat slips.
These boat slips will be required to be vacant during construction.
Potentially'
Significant
Potentially Unless Less than
Significant Mitigation Significant No
impact Incorporation Impact impact
XIII. PUBLIC SERVICES.. .
a. Would the project result in substantial
adverse physical impacts associated with
the provision of new or physically altered
governmental facilities,need for new or
physically altered governmental facilities,
the construction of which could cause significant
environmentalimpacts, in order to mairitain
acceptable service ratios,response time., Or
other performance objectives for any of the
public services:
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 29 of 36
estimated number of days for the second construction season will be approximately 10 — 15 days
with similar conditions (e.g., multiple and lengthy breaks between pile driving activities). In an
effort to ensure pile driving does riot have to occur at nighttime (when h would be more
noticeable and disturbing), the bridge engineer has designed the project to allow for two-lane
traffic while accommodating pile driving. Increased noise as a result of construction activities
will be temporary and sporadic and will therefore remain at a level that is less than significant.
Since the actual time necessary to drive the individual piles is brief, no pile driving will need to
occur at night, on weekends or on holidays.
Potentially
Significant
Potentially Unless Less than
Significant Mitigation Significant No
Impact Incorporation Imoact Impact
XII. POPULATION AND HOUSING-
Would the project:.
a.. Induce substantial population growth in an _ _ _ X
area, either directly(for example,by proposing
new homes and.businesses) or indirectly(for
example,through extension of roads or other
infrastructure)?
b. Displace substantial numbers of existing X
housing,necessitating the construction of
replacement housing elsewhere?
C. Displace substantial nutribers of people,
necessitating the construction of replacement
housing elsewhere?
SUMMARY: Less Than Significant Impact. The proposed project is located along an existing
roadway. The Bethel Island community is a collection of residential and commercial properties.
The population of Bethel Island was recorded in 1990 as'approximately 2,115 residents.. Most of
the local businesses cater to the recreational boating clientele,although there are several general
businesses including liquor stores and real estate offices. Bethel Island also has a number of
residential areas that consist of both primary residences and vacation homes. Replacement of the
bridge will not affect available capacity of Bethel Island Road and will,therefore, not induce
population growth. The project will not result in a change in the location, distribution, density or
growth rate of human population in the area.
Construction of the new bridge and associated levee access roads will require partial acquisition
of the property located to the southeast of the bridge site'(Parcels APN 032-140-015 and APN
032-140-012). Three residential dwellings and one mobile home are currently located on this
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 28 of 36
Potentially
Significant
Potentially Unless Less than
Significant Mitigation' Significant No
Impact Incorporation Irrtoact Impact
e. For a project located within an airport land _ _ _ X
use plan or, where such a plan has not been
adopted, within two miles of a public airport
Or public use airport,would the project .
expose people residing or working in the
project area to excessive noise levels?
f. For a project within the vicinity of a private _ � _ X
airstrip, would the project expose people
residing or working in.the project area i.o
excessive noise levels?
SUMMARY: Less Than Significant Impact. The dominant source of ambient noise in the
project area is vehicles already using Bethel Island Bridge. Construction of the new bridge will
not increase the capacity of Bethel Island Road; therefore, the noise associated with vehicle use
will not be increased by implementation of the project. The existing bridge is the only access to
Bethel Island, and all vehicles accessing the island already use the existing bridge; therefore; the
ambient noise levels associated with routine use of the new bridge will remain the same. On the
southern end of the bridge the roadway in the location of the businesses will.be raised to a
maximum height of 25 feet. Raising the traffic above the businesses is expected to minimize
noise levels experienced by the adjacent businessei3.
Construction activities will increase the noise leve!.•m the vicinity of the project temporarily. In
general, construction activities produce noise levels of 86 dBA at 50 feet. The majority of the
construction activities associated with the bridge re-placement will have comparable noise levels
to this generalized average. Contract specifications will require the use of properly tuned and
muffled equipment to minimize noise generated as a result of construction. Working hours will
be limited to 7:00 a.m. to 7:00 p.m. Monday through Friday, and 9 a.m. to 7 p.m. on weekends
and holidays in order:to limit noise disturbance during sensitive hours. These hours will be
strictly adhered to unless modified upon written approval by the resident engineer. The working
hours will be.incorporated as part of the construction contract.
Pile driving activities generally.produce a noise level of approximately 100 dBA at 50 feet.
Although the noise associated with pile driving is unavoidable, pile driving activities are
expected to be staggered over multiple, often non-consecutive days rather than being conducted
in a concentrated and intensive effort. The set up time for each individual pile is lengthy, so
there will be relatively long breaks between individual pile driving events: The estimated
number of days with pile driving during the first construction season will be approximately
20 days with multiple and lengthy breaks every day.between pile driving activities. The
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 27 of 36
Potentially
Significant
Potentially Unless Less than
Significant Mitigation Significant No
Impact Incorporation Impact IMP=
X. MINERAL RESOURCES - Would the
project:
a. Result in the loss of availability of a known _ X
mineral resource'that would be of value to
the region and the residents of the state?
b. Result in the loss of availability of a locally- _ _ _ X
important mineral resource recovery site
delineated on a local general plan,specific
plan or other land use plan?.
SUMMARY: Less Than Significant Impact. During construction, the project will use paving
materials (i.e., asphalt), wood products, concrete and other materials derived from natural
resources; however, the project will not significantly impact these resources. The use of oil and
gasoline to operate the machinery for construction purposes is negligible and of a short-term,
temporary nature. In order to minimize impacts due to construction activities, contract
specifications will stipulate the elimination of unnecessary idling of equipment when not in use.
Xl. NOISE- Would the project result in:
a. Exposure of persons to or generation of _ _ X
noise levels in excess of standards established
in the local general plan or noise ordinance,
or applicable standards of other agencies?
b. Exposure of persons to or.generation of _ _ X
excessive ground borne vibration or ground
borne noise levels?
C. A substantial permanent increase in _ X _
ambient noise levels in the project vicinity
above levels existing without the project?
d. A substantial temporary or periodic increase _ X .
in ambient noise levels in the project vicinity
above levels existing without the project?
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 26 of 36
bridge is also consistent with the policies outlined by the General Plan: existing circulation
facilities shall be improved and maintained by eliminating structural and geometric design
deficiencies (Policy 579); physical conflicts between vehicular traffic, bicyclists, and pedestrians
shall be minimized (Policy 5-13); and curbs and sidewalks shall be provided in appropriate areas
(Policy 5-15).
There is currently a proposal to develop a parcel that is southeast of the Bethel Island Bridge.as
well as several proposed developments on-island; however replacing the existing bridge with a
bridge that is consistent with current design standards is compatible with this future planned
development. Since the purpose of the bridge is to replace an aging wooden structure; rather than
to increase capacity, construction of the new bridgf; will not have a growth inducing effect on
Bethel Island or the surrounding off-island area and is not expected to have any effect on current
or future development trends. In addition, based on current use and developable area on Bethel
Island, the two-lane design of the bridge is expected to be adequate for future development.
Construction of the new bridge and associated levee access roads will require partial acquisition
of the property located to the southeast of the bridge site (APN 032-140-015 and APN 032-140-
012). Three residential dwellings and one mobile home are currently located on this.property
and will likely be impacted by the project. The'foui residences are currently occupied by tenants.
If relocation of the occupants is required,.the,County's Relocation Assistance Program will
provide the necessary assistance to allow the households to secure comparable, decent, safe and
sanitary replacement housing in the area pursuant to the Federal Relocation Act. The assistance
will include help finding and securing replacement housing, rent differential payments and
moving cost reimbursement. In addition, three businesses on this same property may require
relocation. The County's Relocation Assistance Program will provide for the reimbursement of
compensable, actual, and reasonable moving costs :related to relocating to a new site pursuant to
the Federal Relocation Act. Several boats slips on the northeast side of the bridge may be located
outside of the road right of way in an area necessar, for bridge construction. If the slips are
impacted by the project, the County will relocate the boats and offer to rent the spaces from the
slip rental business.
In order to conform the new bridge to existing grade, the project may require slope easements
and temporary construction easements on a number of parcels including: APN 031-091-011,
APN 031-093-034, APN 031-093-027, APN 031-093-028, APN 031-093-018, APN 031-093-
025, APN 031-093-026, APN 031-093-035, APN 032-330-010, and APN 032-112-004. In
addition, driveway conforms may be necessary on APN 032-130-022, APN 032-330-027 and
APN 032-330-010. Additional real property transactions, including dispensation of surplus
property following completion of the project, may also be required.
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 25 of 36 c
order to minimize the possibility of water quality impacts.
Potentially
Significant
Potentially Unless Less than
Significant Mitiption Significant No
Impact Incorporation Impact impact
EK. LAND USE AND PLANjVNG- Would
the project:
a. Physically divide an established community? ` . . _ _ X
b. Conflict with any applicable land use plan, _ _ _ X
Policy, or regulation of an agency.with .
jurisdiction over the project (including , but
not limited to the general plan, specific plan,
local coastal program, or,zoning ordinance)
adopted for the puipose of avoiding or
mitigating an environmental effect?
C. Conflict with any applicable habitat _ _ _ X
conservation plan or nattiral community
conservation plan?
SUMMARY: No Impact. The Bethel Island community is a collection of residential and
commercial properties located along Dutch Slough in the Delta area of eastern Contra..Costa
County. The Contra Costa County General Plan concept for the Bethel Island area is to preserve
and enhance the rural and recreational quality of the unique area while providing opportunities
for additional residential and.commercial growth tied to water-oriented recreation. Most of the
local businesses cater to the recreational boating clientele, although there are several general
businesses in the area including liquor stores and real estate offices. Bethel Island also has a
number of residential areas that consist of both primary residences and vacation homes.
r
The Bethel Island Bridge is already in place; therefore, constructing the.replacement bridge in.
approximately the same location will:riot further physically divide an established community.
The project will not result in a substantial alteration of th.e present or planned land use of the
area. The project has been specifically designed to avoid impacts to the extent feasible to the
Bethel Island Community. The Public Works Department has made a concerted effort to
construct the replacement bridge as close to the existing:;bridge location as possible (while
accommodating current design standards) in order to avoid disrupting the local community and
nearby neighborhoods.
Reconstruction of the bridge is consistent with the goals_and policies set forth by the Contra
Costa County General Plan. For example, principle goals of the General Plan include providing
a safe, efficient and balanced transportation system (Goal 5-A) and balancing transportation and
circulation needs with the desired character of the community (Goal 5-C). Reconstruction of the
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 24 of.36 .
shell within the shell will provide a buffer, effectively isolating the work activity fTom the watei
in the slough and minimizing the percussion and vibratory effects experienced in the slough and
surrounding areas as a result of the pile driving. Nuisance water resulting from seepage into the
work area will be treated prior to release in the slough to ensure sedimentation is minimized.
The existing bridge pilings will be removed such ghat the amount of silt created due to
disturbance of the slough bed is minimized. Potential removal methods include snapping the
piles at the mud line through the use of heavy equipment such as an excavator or cutting the piles
with an underwater chainsaw and lifting them out. The mud line is expected to be the weakest
point of the old piles, therefore, snapping the piles is expected to have similar impacts to cutting
the piles at mudline (the piles are expected to break.relatively easily if lateral-force is applied).
Since any method chosen to remove the piles will have associated siltation effects, a silt. curtain
will be installed around the piles to allow.the disturbed sediment to settle in the vicinity of the
pile rather than throughout the slough.
With.the vibration minimized,potential sedimentation within the slough will also be minimized.
However, in order to further minimize sedimentation as a result of pile driving activities,
contract specifications will require the installation of silt trapping devices of the contractor's
design to ensure that siltation in the slough during pile driving.and;other-in-water work is kept to
a minimum. The silt trapping devices will be reviewed by the County. In addition, to.prevent
any work materials from entering Dutch Slough dltring construction of the new bridge and
removal of the.old bridge, debris containment methods (e.g., a net barrier) will be required by
contact specifications. The design of the. debris containment will be at the contractor's discretion
and will be reviewed by the County:
Standard construction safety practices will be inco-rp'orated into the project to reduce the
possibility of a spill of gasoline, oil, or other pollutant that could have a significant impact on
water quality. In the event of any toxic substances being.discharged into Rock Slough; local .
water agencies and cities that utilize the Delta as a drinking water source will be immediately
notified of the discharge. In addition, the Department of Fish and Game and the Regional Water
Quality Control Board will be notified of any spills. The contractor will be required to use his
best efforts to work with these agencies to contain and remove the discharged substances from
the public water supply to an appropriate location for remediation.
Total disturbance due to construction of the replacement bridge will be approximately 3.5 acres.
Based on the proximity to the slough and the expected two-year phasing of the project,
appropriate best management practices to minimize erosion will be required as part of the project
specifications. A Stormwater Pollution Prevention Plan will be prepared by the contractor and
accepted by Public.Works prior to project implementation. At the completion of the project, all
disturbed areas will be stabilized through the use of hydroseeding and/or erosion control
blanketing, as appropriate. Water Quality Certification will be obtained from the San Francisco
Bay Regional Neater Quality Control Board (RWQ,—'B) prior to construction of the project.
Special conditions required by the certification wil:! be complied with during construction in
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 23 of 36
Potentially
Significant
Potentially Unless less than
Significant Mitigation Significant No
Impact Incorooratioi pig Impact
i. Expose people or structures to a significant _ X
risk of loss, injury or death involving flooding,
including flooding as a result of the failure
of a levee or dam?
j. Inundation by seiche, tsunami, or mudflow? _ _ _ X
SUMMARY: Less Than Sigi ificant,Impact. The Bethel Island Bridge crosses over Dutch
Slough. According to the Contra Costa County Flood Control District Flood Insurance Rate
Zone Information Map and the Resource Mapping System, the project site is located in a Zone;A
(areas of 100-year flood) floodplain. However, since.the.new bridge will be constructed in
approximately the same location as the existing bridge,:and.since the clearance will be greater
than the existing bridge, there will be no increased exposure of people-or property to flooding.
Additionally since the design of the new bridge is not significantly different than the.existing
bridge, it will not impair the flow of water, nor will it alter the course or flow of floodwaters. In
fact, there will be fewer piles installed for the new bridge than there are currently in the slough
supporting the existing bridge allowing for slightly greater capacity in the slough.
The increase in the bridge size is necessary to add an additional foot of lane area on both lanes; as
well as sidewalks and shoulders on both sides of the bridge. These improvements willnot create
an impervious surface area that will substantially increase the rate and amount of runoff. ,
Therefore, the amount of surface water in Dutch Slough will not change significantly as a result .
of the project.
Building the bridge will not adversely affect the qumtity;or quality-of surface water, ground
water or public water supply. Measures will be undertaken in the design and construction of the
Bethel Island'Bridge project to avoid adverse impacts to--water quality. The bridge pilings Will be
constructed of steel encased concrete.-The steel piling shells will be driven into the bed of the .
slough; the bed material will be removed from the pile,:and the shell will be filled with concrete .
.to create the support structure for the bridge. Since the bridge pilings are driven as shells,
vibration associated with the pile driving will be minimized relative to the vibration associated -
with a solid pile because there is less material to displace. Nevertheless; in order to minimize:
the potential sedimentation and vibration associated with pile driving activities, construction will
include preliminary placement of oversized hollow steel columns on the bed of the slough at each
pile location. These steel columns will be sized to extend from the bed of the slough to the water
line. Once the steel columns are lowered into place; they will be dewatered and the steel shell':
piles will be driven in the dewatered column. The dewatered area surrounding the steel.piling
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 22.of 36
Potentially
Significant
Potentially Unless Less than
Significant Mitigation Significant No
Impact Incorporation Impact Impact
VIII. HYDROLOGY AND WATER QUALITY -
Would the project:
a. Violate any water quality standards or X _
waste discharge requirements?
b. Substantially deplete groundwater suppoes. _ _ X _
or interfere substantially with groundwater
recharge such that there would be a net
deficit in aquifer.volume or a lowering
of.the local,groundwater table level (e.g;,
the production rate of pre-existing nearby
wells would drop to a level which would not
support existing land uses or planned uses
for which permits have been granted)? r
C. Substantially alter the existing drainage _
pattern of the site or..area,including through .
the alteration of the..course of a stream of river,
in a manner which would result in substantial
erosion or siltation on- or off-site?
d. Substantially alter the existing drainage _ X
pattern.of the site or area, including through
the alteration of the course of a stream or
river, or substantially increase the rate o:.-
amount of_suiface runoff in a manner which
would result in flooding on-.or off-site?
C. Create or contribute runoff water which _. X _
would exceed the capacity of existing or
planned storm water drainage systems or
provide substantial.additional sources of::
polluted runoff?
f. Otherwise substantially degrade water _ — X
quality?
g. Place housing within a 100-year flood X
hazard area as mapped on a federal Flood
Hazard Boundary or Flood Insurance Rate .
Map or other flood hazard delineation map?
h. Place within a 100-year flood hazard area X
structures which would impede or redirect
flood flows?
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 21 of 36
1)petroleum leakage associated with an above ground storage tank, 2) an area of elevated lead
concentration due to an unknown source, 3) structures that may potentially have asbestos-
containing materials, and'4) the wooden bridge pilings that have been chemically treated..
The data associated with source l) indicate that gasoline and diesel products have been released
to soils and groundwater in the vicinity of the storage tank. The detected concentrations exceed
their Risk Based Screening Levels established by the Regional Water Quality Control Board for
commercial/industrial sites. However, the Phase D concluded that given that the proposed use of
the area is a roadway, risks to human health and the environment will be'limited to construction
workers and construction elements. The Phase D recommends properly segregating and
managing soils from the area as petroleum-impacted soils. The Phase II further recommends
conducting any necessary dewatering activities in accordance with applicable NPDES permits.
The contractor will be made aware that there is petroleum contamination at this location and
these recommendations will become a part of the project's plans and specifications.
The data associated with source 2) indicate that.there is not a significant risk to construction
workers and the environment due to elevated lead levels as long as-appropriate measures are
implemented during construction. As.a result of the Phase D recommendations, a Certified
Industrial Hygienist (CIH)will be retained to prepare a Lead Compliance Plan that will be
implemented during construction to ensure workers are protected and soils are.appropriately
handled.
Per Phase D recommendation,' prior to demolition of any structures, an asbestos containing
material (ACM) and lead based paint (LBP) survey will be conducted-by a CIH to evaluate
whether these materials are present in structures to be demolished..If the materials are present,
the appropriate removal measures will be implemented to ensure no worker exposure to these
materials occurs.
The wooden pilings associated with the bridge have been:chemically treated. Per Phase D
recommendation, any timber sections.'that will be removed will be transported to and disposed of
at a local landfill that is permitted to accept chemically treated wood products.
The project has the potential to release hazardous substances, such as accidental petroleum spills
from equipment, during construction.'Per the contract specifications, standard construction
safety practices, such as placement of stationary equipment over drip pans and regular
maintenance of vehicles to minimize the potential.for leaks, will be followed during construction
to ensure no accidental release of hazardous substances or increase in the potential for exposure
to these substances.
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration,
Page 20 of 36
Potentially
Significant
Potentially Unless less than
Significant Mitigation Significant No
Impact lncorvoration linnact ]mnact
d. Be located on a site which is included on a _ _ X
list of hazardous materials sites compiled
pursuant to Government .Code Section 65862.5
and, as a result,would it create a significant
hazard to the public or the environment?
e. For a.project located within an airport land };
use plan or, where such a plan has not been
adopted;within two miles of a public airport
or public use airport,would the project result in
a safety hazard for people residingor working in
the project area.
f. Fora project within the vicinity of a private _ _ _ x
airstrip,would the project result in a safety
hazard for people residing or working in the
project area?
g. Impair implementation of or physically _ _ x
interfere with an adopted emergency response
plan or emergency evacuation plan?
h. Expose.people or structures to a significant _ _ X
risk of loss, injury or death involving,wildland
fires, including where wildlands are.adjacent.
to urbanized areas or where residences are
intermixed with wildlands?
SUMMARY: Potentially Significant Unless Mitigated. According to the "State of California
Hazardous Waste and Substances Site List" (April 1998), there are no hazardous waste sites
within the project area; however, based on the types of businesses (e.g., boat storage and repair)
surrounding the project area, a Phase I Environmental Site Assessment was conducted to identify
any potential environmental concerns associated with the past or present use, generation, storage,
or disposal of hazardous materials at the project site and adjacent sites that could impact the
project site. The Phase I report concluded that there is a potential for soil and groundwater
contamination at the project site. Based on these potential sources of contamination, the Phase I
report recommended a sampling plan be prepared and implemented as part of a Phase D Site
Assessment prior to project construction to determine whether any chemicals of potential
concern are present in the soil and groundwater within the project impact area.
The Phase D determined that there are four potential sources of contamination at the project site:
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 19 of 36
Superficial grading ofthe project area is not expected to result in.unstable earth conditions or change
geographical substructures. Exposure of people or property to geologic hazards is not expected to
increase as a result of the project. All areas left exposed due to construction of the bridge will be
seeded with a mix including native grasses and wildflowers upon completion of the project in order
to stabilize exposed soil.
In order to mininvze the potential sedimentation and vibration associated with pile driving activities,
construction will include preliminary placement of oversized hollow steel columns on the bed of the
slough at each pile location. These steel columns will be sized.to extend from the bed of the slough
to the water line. Once the steel columns are lowered into place, they will be dewatered and the piles
will be driven in the dewatered column. The dewatered area between the column and the steel
pilings will provide a buffer, effectively isolating the work activity from the water in the slough and
minimizing the percussion and vibratory effects experienced in the slough and surrounding areas as a-
result of the pile driving. Nevertheless,pile driving activities may cause minor waves within Dutch
Slough as a result of vibration; however, this type of vibratory wave dissipates rapidly,and the pile
driving activities are riot expected to cause significant wave-based erosion on the banks of the levees,
particularly since the levees in the area of the bridge are armored with rock nprap.
Potentially
Significant
Potentially Unless Less than
Significant Mitigation Significant No
Impact Incorporation Impact Impact
vIl. HAZARDS AND HAZARDOUS MATERIALS -
Would the project:
a. Create a significant hazard to the public _ X
or the environment through the routine
transport, use, or disposal of hazardous
materials?
b. Create a significant hazard to the public _ _ _X _
or the environment through reasonably
foreseeable upset and accident conditions
involving the release of hazardous materials
into the environment?
C. Emit hazardous emissions or handle _ _ _ X
hazardous or acutely hazardous materials,
substances, or waste within one-quarter mile
of an existing or proposed school?
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 18 of 36
Potentially
Significant
Potentially Unless Less than
Significant Mitigation Significant No
Impact Incorporation Impact Impact
d. Be located on expansive soil,.as defineij in _ _ X
Table 18-1-B of the Uniform.Building Code
(1994), creating substantial risks to life'or
property?
e. Have soils incapable of adequately sup1porting _ _ _ X
the use of septic tanks or alternative w2ste
disposal systems where sewers are not,available
for the disposal of waste.water?.
SUMMARY: Less Than Significant Impact. Th.e on and off-island areas (Bethel Island versus
Hotchkiss Tract)differ greatly in regards to soils,topographic and geographic conditions,and levee
stability. The on-island area consists of weak,organic soils that underlie the perimeter levee system,
provides limited opportunities for evacuation in the event of a levee failure, is generally below sea
level and subsiding;and provides limited opportunities for safe disbursement of flood water because .
it is a small island closed by levees. In the off-island area (Hotchkiss Tract), the soil is sandy and
less subject to subsidence,the elevation is higher,die levee system is in an improved condition,there
are several evacuation alternatives, and it is part of the mainland.
Grading of the construction site will result in a minor change in topography and temporarily increase
the exposure of soils to wind erosion. Standard dust.control and erosion control practices,including,
but not limited to, general watering of exposed areas and/or use of chemical stabilizers will be
adhered to. These control measures will minimize the potential for wind erosion as a result of
exposure due to grading and associated construction activites. These measures will be incorporated
into the construction contract.
Construction of the replacement bridge will not expose people to adverse impacts due to seismic
activity. The soils in the location of the bridge have a high liquefaction potential and stability of the
soils during earthquake activity is poor. There is an earthquake fault with an uncertain location that
runs in a north-south direction on the eastern side of Bethel Island. The unstable soils and the nearby
fault have been accounted for in the design process and the replacement bridge will be designed to
handle the Maximum.Credible Earthquake (MCE) event (California Seismic Hazard Map, 1996).
The MCE event is the largest earthquake reasonably expected to impact the structure based on
recorded data.
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 17 of 36
Based on the lack of evidence of archaeological resources and the determination that neither the
residential and business structures,, nor the budge or levees are historically significant, the
archeological consultant determined that impacts to cultural resources are not expected.
Nevertheless, contract specifications will include measures related to discovery of cultural resources,
including informing personnel connected with the project of the possibility of finding archaeological
and/or historical resources,requiring notification of the Resident Engineer and stopping work within
85 feet of a discovery, and retention of a cultural resources consultant to provide assistance in the
event of a discovery.. In addition, the.Resident Engineer for the project will receive, instruction
regarding identification of archaeological and historical resources in the field.
Potentially
Significant.
Potentially Unien Less than
Significant Mitigation Significant No
impact Incorporation impact Impact,
VI. GEOLOGY AND SOILS-Would the
project?
a. Expose people or structures to potential
substantial adverse effects, including'the .
risk of loss, injury, or death involving:
1. Rupture of a known earthquake fault, _ _ X _
as delineated on the most.recent Alquist-
Priolo Earthquake Fault Zoning Map
issued by the State Geologist for the
area or based on other substantial evidence
of a known fault? Refer'to Division of Mines
and Geology Special.Publication 42.
2. Strong seismic ground shaking? _ _ X _
3. Seismic-related ground failure, including _ _ X
liquefaction?
4. Landslides?
b. Result in substantial soil erosion or the loss _ X
of topsoil?
C. Be located on a'geologic unit or soil that is _ _ X .
unstable, or that would become unstable as
a result of the project, and potentially result
in on-or off-site landslide, lateral spreading,
subsidence, liquefaction,or collapse?
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 16 of 36
Potentially
Significant
Potentially Unless Less than
Significant Mitigation Significant No
Impact Incomoration Impact impact
V. CULTURAL RESOURCES. Would the project-
a. Cause a substantial adverse change in tlkie _ X
significance of a historical resource as
defined in §15064.5?
b.. Cause a substantial adverse change in the _ X
significance of an archaeological resource
pursuant to §15064.5?
C. Directly or indirectly destroy a unique _ X
paleontological resource or site or unique
geologic feature?
d. Disturb any human remains, including _ _ X
those interred outside of formal cemeteiies?
SUMMARY: Less. Than Significant Impact. A records search conducted by the Northwest
Information Center(NWIC) at Sonoma State University indicated a high possibility of identifying
Native American resources and a low possibility of identifying historic archaeological resources in
the project area. Based on the results of their research, KWIC recommended further archival and
field study by a qualified archaeologist. As a result of the NWIC recommendation, the County
hued an archaeological consultant to conduct a more detailed review of.the area. The consultant
researched a number of sources including the National Register of Historic Places (NHRP), the
California Register of Historic Resources, the California Inventory of Historic Resources and the
Native American Heritage Commission. In addition to the in-depth records search; the consultant
also visually inspected the unpaved portions of the project impact area in 15 meter wide parallel
transects. Based on the records search and field review,no archaeological resources were.identified
within the project area;therefore; archaeological resources are not expected to be encountered during
construction.
The. consultant also reviewed the project for potential historic architectural resources. The
architectural historian concluded that there are no properties within the project impact area that
appear to meet the criteria necessary for eligibilit}' for the National Register of Historic Places.
Included within the analysis for historic architectural resources were the Bethel Island Levee and the
Hotchkiss Tract Levee. In addition to archeological and architectural resources,the archeologist also
researched the historic value of the Bethel Island I.I idge itself. Although the bridge is a typical
example of post-World War E development,it is one:of many such bridges that survive. In addition,
the bridge was altered in 1969 and no longer possesses historical integrity.
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 15 of 36
The project description has also been designed to include,a number of additional measures that
will further minimize impacts.to these sensitive fish species; ..Inparticular, to avoid potential
impacts to fish spawn and/or fry, all iin=water work will be limited to the summer and fall months
of any given year. This work window will be strictly adhered to unless otherwise ageed to by
the County and NMFS or USFWS.. During pile driving activities (e.g., placing the protective
steel shells on the slough bed), contract specifications will require the installation of silt trapping
devices of the contractor's design to ensure that, siltation in the slough is kept to a minimum.
Although design of the silt trapping devices will beat the discretion of the contractor,the.design
will be reviewed by the County. The,pile driving construction method and the avoidance and
minimization measures built into theproject description are expected:to effectively minimize
impact to all fish species present within Dutch Slough regardless of varying spawning periods
and the negotiated construction window.
Based on the limited.impacts to emergent-wetland vegetation (the primary breeding and feeding
habitat of the sensitive.fish species potentially in the Delta), and avoidance and minimization
measures that have been incorporated:into the project descripiion, it is expected that consultation
with the resource agencies.will be informal and the project will be,deemed notlikely to adversely
affect the listed fish species (pers.coma Scott Cotter, USFWS:Biologist, 2%7/01). However,
regardless of whether the consultation is ultimately informal or.formal, the Department will.
implement any conditions negotiated .with the resource agencies to ensure that impacts.to the
sensitive fish species remain at a level of less than significant..
Five native trees (one cottonwood and four willows)will be removed as a result of the prof ect.
Although the trees are native and are typically known as riparian species, the willows and
cottonwood are isolated from Dutch Slough by the levees. The high groundwater table in the
area is likely functioning as the.necessary source of water for these five trees. The five trees will
be replaced at a 2:1 ratio near the bottom.of.the fill slopes associated with.the new access road.
Based on the high water table; the plantings are expected to thrive. Nevertheless, the trees will
be maintained for three years to ensure successful establishment. In order to minimize damage to
any additional trees that are not planned for removal but may be impacted by construction,
contract specifications will include protective measures such as'clean trimming of roots and
limbs. Orange construction fencing will be installed to delineate the limits of construction
impact in areas that are considered sensitive (primarily surrounding the slough and the nearby
freshwater marsh). The fencing will serve.to isolate environmentally sensitive areas (ESAs) from
construction activities.
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration.
Page 14 of 36
A fifth habitat type, freshwater marsh, is located in the general vicinity of the bridge; however,
this habitat type does not fall within the project impact area. There is apotential, for indirect
impacts to the freshwater marsh due to increased sedimentation'as a result.of construction
activities-, however, these potential impacts will. be reduced less than significant as a result of the
implementation of standard dust and erosion measures during project implementati-on,and well as
the clear delineation of the marsh as a sensitive area that must be avoided.
The Delta is considered critical habitat for Delta smelt (Hypomesus transpgci;dus); a'state`and
federally listed.endangered fish. In addition, Dutch Slough has potential habitat for state
threatened and federally proposed endangered spring run salmon (Onocorhyn'chus'ishawvscha),
state endangered and federally endangered winter nin salmon (Onocorhynchus tshawyischa)
federally threatened Sacramento splittail (Pogonichthys macrolepidotus), federally threatened
steelhead (Onocorhynchus mykiss), and federally endangered tidewater goby(Eucyclogobius
newberryi). Dutch Slough is also potential habitat for several fish species:that are federal species
of concern including green sturgeon (Acispenser medirgstris), longfin smelt (Spiririchus
thaleichthys), river lamprey (Lampetra ayresi), and Pacific lamprey (Lampetra tridentate). The
slough also falls within an area categorized as Essettial Fish Habitat (EFH) for starry flounder
(Platichthys stellatus). Although consultation.with the resource agencies with jurisdiction over
these listed species (U.S. Fish and Wildlife Service USFWS, and National Marine Fisheries
Service - NMFS), will be formally conducted between the Federal Highways Administration'
(FHWA—the federal agency with funding authority over the project) and the Services,staff from
the County have coordinated with staff from the re&:iurc'e agencies to assist'with'projectplanning.
Construction methods that will be used for the bridge have been chosen to accommodate'
sensitive resources. The bridge pilings will be constructed of steel encased concrete. The steel
piling shells will be driven into the bed of the slouga, the bed material will be removed from the
pile, and the shell will be filled with concrete to cre;ite the support structure for the bridge. Since'
the bridge pilings are driven as shells, vibration associated with the pile driving will be
minimized relative to the vibration associated with a solid pile because there is less material to
displace. Nevertheless, in order to ensure impacts as a result of pile driving are minimized,
project construction has been further designed to minimize impacts to sensitive biological
resources within the slough. In order to minimize the potentia] sedimentation and vibration.
associated with pile driving activities, construction will include preliminary placement of
oversized hollow steel columns on the bed of the slough at each pile location. These steel
columns will be sized to extend from the bed of the slough to the water line. Once the steel
columns are lowered into place, they will be dewate.red and the steel shell piles will be driven in
the dewatered column. The dewatered area surrounding the steel piling shell within the shell will
provide a buffer, effectively isolating the work activity from the water in the slough and
minimizing the percussion and vibratory effects experienced in the slough and surrounding areas
as a result of the pile driving. Nuisance water resulting from seepage into. the work area will be
treated prior to release in the slough to ensure sedimentation is minimized.
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration. .
Page 13 of 36
dactylon), and Himalayan blackberry(Rubus discolor). The drainage serves as a roadside ditch
along Wells Road.and all water collected at the lowest point of the drainage is pumped under
Bethel Island Road: The project will require the placement of fill within the length of this
drainage; however, a jurisdictional delineation conducted for the project determined that the
drainage is not subject to U.S.. Army Corps of Engineers jurisdiction since the Corps does not
take jurisdiction.,over drainage ditches (Denise Duffy & Associates, December 2001). The Corps
will be contacted so they may confirm the jurisdictional delineation. In addition, based on the
lack of continuous hydrology and the severely degraded nature of the drainage, the California
Department of Fish and Game will likely opt not to take jurisdiction over the ditch; however they
will be contacted in order.to allow them to make a determination regarding their jurisdiction.
The third type of habitat can be classified as urban or ruderal.. This habitat type occurs above the
high tide line of the slough and includes the disturbed, developed areas behind the levees.Along
the banks of the slough, this area is covered primarily in riprap and the majority of the associated
vegetation is weedy and sparsely scattered. Vegetation in the area consists of turkey mullen
(Eremocarpus setiferum), pampas grass (Cotadi ria selloana), yellow star thistle (Centuarea
solstitialis), and sea fig (Carpobrotus occidentalis). Beyond the top of bank of the slough.the
vegetation is a blend of horticultural plants and weeds including black mustard (Brassica nigra),
wild radish (Raphahus sativus), and palm (Washingtonia.ftlifera). Much of this area is also
covered by concrete, bare or graveled ground and structures. Typical animal species expected'in
this habitat type include raccoon (Procyon lotor.), opossum (Didelphismarsupialis), scrub jay
(Aphelocoma californica), American crow (Corvus brachyrhynchos), and rock dove (Columbia
livia). Based on the previous level of disturbance associated with this habitat type and the lack of
sensitive species, no significant impacts are expected as a result of the project.
The fourth habitat type consists of the bridge itself. Several barn swallow (Hirundo rustica) and .
cliff swallow (Petrochelidon pyrrhonoia) nests were identified along the length offthe bridge .
structure. Although swallows are not a federally or state listed species, they are protected under .
the Migratory Bird Treaty Act and impacts to the birds could be considered potentially
significant. Based on the likelihood that the swallows return to the bridge site on an annual
basis, the Public Works Department will remove the swallow nests prior to February 15 of the:
year bridge demolition will occur and install exclusionary netting before the swallows return to
build new nests. With these precautions, the potential impacts to the swallows will be reduced to
a level that is less than significant. Itis also possible, blit unlikely based'on habitat conditions:
that the bridge may be used by the western mastiff bat (Eumops perotis), a federal and state
species of concern. Based on the lack of expansion joints and hinges on the bridge, there is no.
quality roosting habitat; however, in order to ensure no impacts to sensitive bat species, a
qualified bat biologist will conduct a habitat survey of the bridge. If the survey does not find
evidence of bat utilization of the bridge, no further action will be taken. However, if itis
determined that bats may roost at or near the bridge, coordination with the California.Department
of Fish and Game will be initiated to.ensure the species are adequately protected.
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 12 of 36
Potentially
Significant'
Potentially Unless Less than
Significant Mitigation Significant No
IMD2Ct Incorporation. fact ImDact
e. Conflict with any local policies or — X-
ordinances protecting biological resources,
such as tree preservation policy or ordinance?
f. Conflict with the provisions of an _ _ _ X
adopted Habitat Conservation Plan,
Natural Community Conservation Plan,
or other.approved local,regional, or
state habitat conservation plan?
SUNIlyIARY: Potentially Significant Unless Mitigated. There are four habitat types located.
within the project area. The first habitat type consists of the slough that Bethel Island Bridge
crosses (Dutch Slough). This habitat type is defined as the portion of the slough that occurs
below the mean high tide.line. Within this habitat ripe, the area between.the high tide line and
the low tide line of the slough consists primarily of riprap and. sparse cover.(less than 10 %) of
weedy species such as dock (Rumex sp.), thistle (Circium.sp.), willow weed (Epilobium sp.), and
crab grass (Digitaria sanguirlahs). Typical animal :;pecies expected to occur between the low and
high tide line of the.slough include.western toad (Bufo boreas),western fence lizard (Sceloporus
occidentalis), and great egret (Casmerodius albus). In the area from the low tide line to the .
bottom of the slough there is no visible vegetation. Typical animal..species expected to.occur
below the low tide line include crayfish, catfish, and mosquito fish.
The slough below the mean high tide line is subject to U.& Army Corps of Engineers'
jurisdiction and a Corps permit will be obtained.for all work within the slough below the mean
high tide line. In addition, the slough is subject to California Department.ofFish.and Game and
California Regional Water Quality Control Board jurisdiction. A Streambed Alteration
Agreement and Water Quality Certification will be obtained from the respective agencies prior to.
initiating work within the slough. Conditions of these permits will be negotiated between the
agencies and the Public Works Department and will be strictly adhered to'during construction.
There.is one small (144 square foot)patch of emergent wetland vegetation on the northeast.bank
of the slough. Based on the abundant amount of similar emergent vegetation adjacent to the
project site and within the slough,potential disturbance of this small patch of emergent
vegetation is not considered a significant impact to the habitat.
The second habitat type consists of a small drainage: ditch and associated fringe wetlands along.
Wells Road. The drainage ditch is highly disturbed and contains garbage and concrete pieces as
well as limited vegetation including duckweed (Lernna sp.) and cattails (Tvpho.latifolia). The
banks of the drainage ditch support hoary nettle (Urtica diocia), Bermuda grass (Cynodon
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page I I of 36
properly tuned and muffled equipment and the elimination of unnecessary idling of equipment
when not in use. Iinpl.ementation of dust control practices including general watering of
exposed areas and/or use of chemical:stabilizers will also minimize air quality impacts. The
temporary,negligible deterioration of,ambient air quality at the construction site will have no
potentially adverse long-term;impacts to air quality.
Nopermanent air quality impacts due'to vehicle traffic will be.generated.by the project since no
additional trips will be generated by the bridge replacement. .Although"the replacement bridge
will satisfy current design requirements, it will have the same number of vehicle lanes; therefore,
the new budge will not have increased capacity and will not lead to an increase in vehicle trips to
Bethel Island.
Potentially
Significant
Potentially Unless Less than
Significant Mitigation Significant No
impact Incorporation Impact Impact
TV. BIOLOGICAL RESOURCES. Would the project:
a. Have a substantial adverse effect, either
directly or through habitat modifications,
on any species identified as a candidate,
sensitive, or special status species in local
or regional plans,.polices, or regulations,or
by the California Department of Fish and
Game or U.S. Fish and Wildlife Service?
b. Have a substantial adverse effect on any X
riparian habitat or other,sensitive natural
community identified in local or regional.
plans,policies,regulations or by the California
Department of Fish and.Game or US Fish.
and Wildlife Service? .
C. Have a substantial adverse effect on _ X
federally protected wetlands as defined
by Section 404 of the Clean Water Act
(including, but not limited to,marsh; vernal.
pool, coastal, etc.)through direct removal,
filling, hydrological interruption, or other
means?
d. Interfere substantially with the movement _ _ X _
of any nativeresident or migratory fish or
wildlife species or with established-native
resident or migratory wildlife corridors, or
impede the use of native.wildlife nursery sites?
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration..
Page 10 of 36
SUMMARY: Less Than Significant Impact. The project will not impact any locally or statewide
important farmland. The land immediately adjacent to the project is primarily developed with
businesses catering to the recreational boating enthusiast. The Contra Costa Cotinty Important
Farmland Map(1998)identifies the project as beim;within"urban and built-up' land", "Farmland of
Local Importance"'surrounds the urban and built up areas according to the Important Fam land Map;
however, the area with this designation is located entirely outside of the project area and will not be
impacted by the project.
Potentially
Significant
Potentially Unless Less than
Significant Mitigation Significant No
impact incorporation Impact Impact
III. AIR QUALITY. Where available, the
significance criteria established.by the
applicable air quality management or air
pollution control district may be relied upon
to make the following determinations.
Would the project:
a. Conflict with or obstruct implementation _ X
of the applicable air quality plan?
b. Violate any air quality standard or _ _ X
contribute to an existing or projected
air quality violation?
c: Result in a cumulatively considerable _ _. X _
net.increase of any criteria pollutant for
which the project region is non-attainment
under an applicable federal or state ambient
air quality standard (including releasing
emissions which exceed quantitative
thresholds for ozone precursors)?
d. Expose sensitive receptors to substantiz..l _ _ X
pollutant concentrations?
e. Create objectionable odors affecting a _ }�
substantial number of people?
SUMMARY: Less Than Significant Impact. Shore-term emissions and objectionable odors may
be generated during construction; however, they will be minor and temporary. In order to
minimize impacts due to construction activities, contract specifications. will stipulate the use of
Bethel Island_Bridge Replacement Project
Mitigated Negative Declaration
Page 9 of 36
from either side of the bridge, and the:smaller amount of bridge pilings will allow for a more open
view of Dutch Slough from the surrounding areas.
There is limited vegetation in the vicinity of the bridge. .The slough banks are almost entirely
covered in riprap. What little vegetation there is within the project area consists primarily q weedy
ruderal species. Approximately five native trees will require removal in order to construct the raised
access road southeast of the bridge. These trees will be replaced at a 2:1 ratio.near the bottom ofthe
fill slopes associated.with the new access road. The trees will be maintained for three years to ensure
successful establishment. Several additional ornamental trees may require removal in order to
construct the raised access road.
The Bethel Island Bridge Replacement Project will include installation.of two pole lights, one at each
end of the bridge, to.provide for safety lighting. This safety lighting will not create a significant'
source of light or glare. At the southern end of the bridge, the new bridge will be an average of 20
feet higher than the existing bridge;however,the bridge will be constructed of concrete which has a
relatively neutral color and texture that does not reflect light effectively and will;therefore,not create
significant glare.
Potentially
Significant
Potentially Unless Less than
Significant Mitigation Significant No
Impact Incomoration Imnact Impact
I.I. AGRICULTURAL RESOURCES: In determining
whether impacts to agricultural resources are
significant environmental effects, lead agencieS
may refer to the California Agricultural Land
Evaluation and Site Assessment Model (1997)
prepared by the California Dept. Of Conservation
as an optional model to use in assessing impacts
on agricultural and farmland. Would the project:
a. Convert Prime Farmland, Unique Farmland, _ _ _ X
or Farmland of Statewide Importance
(Farmland), as shown on the maps prepared
pursuant to the Farmland Mapping and Monitoring,
Program of the California Resources Agency,
to non-agricultural use?
b. Conflict with existing zoning for _ _ _ X
agricultural use, or a Williamson
Act contract?
C. Involve other changes in the existing _ _ _ X
environment which, due to their location
or nature, could result in conversion of
Farmland, to non-agricultural use?
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 8 of 36'
To the extent feasible,the replacement bridge has been designed to avoid impact to the Bethel Island
Community; therefore, conditions surrounding the: bridge will be roughly the same following
implementation of the project. The replacement bridge will be constructed in approximately the
same location as the existing bridge but it will be lunger and wider than the existing bridge. The
northern end of the new bridge will touch down and return to existing road grade iri essentially the
same location as the existing northern end. The southern end of the bridge will extend roughly 270
feet farther than it currently does. The length of the bridge must be increased in order to meet the
required 35-mile per hour (mph) stopping sight distance criteria as.well as to provide the adequate
clearance over the levee in compliance with Caltrzms' minimum height for overpasses. On the
southeast side of the bridge, a raised access road will provide general and emergency access to the
existing southern levee road.
Based on the extended length of the new bridge, the two businesses nearest the slough on the-
southwestern
hesouthwestern side of the bridge will look under the new taller bridge and at the gently sloping raised
earthen berm of the access road on the other side of Bethel Island Road. Thi' new view will be more
pleasant than the view the businesses currently have which consists of Bethel Island Road and the
marine store and boat storage directly across Bethel Island Road. With installation of the raised
access road, the homes and businesses nearest the bridge on the southeastern side of the bridge will
view a gently sloping earthen berm covered in hydroseeded grasses rather than the back of a boat
storage facility; therefore, views from this direction will be improved by the project.
The extended length of the bridge will require construction of a mechanically stabilized earth(MSE)
wall varying in height from 2 to 25 feet for roughly 4.50 linear feet along the southwest corner of the
project site. The wall will start approximately 250 feet south of the southern levee and extend to
approximately 700 feet south of the levee. Although the wall will be fairly tall,it is not expected to
have a significant aesthetic impact based on a number of factors, including` 1) the wall will be
located adjacent to two existing businesses (rather than residences), 2) the business located at the
tallest point of the wall does not have any windows facing the roadway, 3) based on the current
location of boat storage, the view of the wall will be partially covered by stationary boats, 4) the
business located farthest south where the wall tapers down will view the wall at a height varying
between 5 and 10 feet, and 5) construction will include an architectural finish (such as a fractured-
face finish or textured finish)to ensure that the wall is aesthetically pleasing. There is one residence
located in an area that may have at least a partial view of the retaining wall; however; that
residence's current view consists of the back of a tall boxy building; therefore, impacts due to
installation of the retaining wall are not considered significant.
The replacement bridge project is consistent with Transportation and Circulation Element Policy
No. 5-37 (The existing system of scenic routes shall be enhanced to increase the enjoyment and
opportunities for scenic pleasure driving to major recreational and cultural centers throughout this
and adjacent counties). Replacement of the bridge will bring the bridge up to current design
standards allowing for the construction of sidewalks and shoulders along. the length of the new
bridge. Construction of adequate sidewalks will allow pedestrians to view the Dutch Slough area
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 7 of 36
EVALUATION OF ENVIRONMENTAL IMPACTS:
Potentially
Significant
Potentially Unless Less than
Significant Mitigation Significant No
impact Ineorpontion .Impact Impact
I. AESTHETICS. Would the proposal:
a. Have a substantial adverse effect on a _ _ X
scenic vista?
b. Substantially damage scenic resources, _ X
including,but not limited to,trees,rock
outcroppings, and historic buildings within
a state scenic highway?-
C. Substantially degrade the existing
visual character or quality of the site and
its surroundings?
d. Create a new source of substantial light _ _ X _
or glare which would adversely affect
day or nighttime views in the area?
SUMMARY: Less Than Significant Impact. Bethel Island Road is classified as a scenic route iri the
Contra Costa County General Plan. In the vicinity of the Bethel Island Bridge Replacement project,
the most visually prominent feature is Dutch Slough. The area immediately surrounding the bridge
consists primarily of businesses geared toward the recreational boating community;therefore,typical
views in the vicinity of the bridge include fairly nondescript and boxy warehouse-style buildings
generally used.for boat storage and/or repair, and boats stored on trailers. The existing bridge
consists of a concrete deck over a wooden substructure containing twenty=five creosote:coated
timber bents with multiple pilings in each bent. Although the existing bridge is not unpleasant to
view, the structure is clearly aging and is supported by multiple piers on multiple bents that,obstruct
the view of the slough. The new bridge will be constructed with a concrete deck and pilings. Based
on the updated design, the bridge will have considerably fewer pilings than the existing bridge;
therefore, views of the slough under the bridge wi11 be generally less obstructed than they currently .
are. A small-scale model of the bridge has been displayed at public meetings to allow the interested
public a representative view of the proposed bridge.
Bethel Island Bridge Replacement Project
Mingated Negative Declaration
Page 6 of 36
SOURCES
In the process of preparing the Checklist and conducting the evaluation, the following references
(which are available for review at the Contra Costa County Public Works Department, 255 Glacier
Drive, Martinez, CA 94553)were consulted:
I. Contra Costa Resource Mapping System - Quad Sheet Panels for Jersey Island Quadrangle,
California
2. The (Reconsolidated) County General Plan (July 1996) and Draft EIR on the General Plan
(September 1990)
3. Contra Costa County Important Farmland Map 1998,California Department of Conservation
Division of Land Resources Protection, 1959
4. Field reviews and/or Project Description.(including coordination with Planning and Design
Engineer)
5. Soil Survey of Contra Costa County, Soil Conservation Service, 9/77
6. Contra Costa County Flood Insurance Rate Zone Information Map
7. State of California Hazardous Waste and Substances Sites List, April 1998
8. Natural Environment Study/Biological Assessment, Bethel Island Bridge Replacement
Project, Josh Harwayne, Denise Duffy & Associates, December 2061
9. Historic Property Survey Report,Bethel Island Bridge Replacement Project,Denise Bradley,
Historian, URS Corporation, September 2001
10. Socioeconomic Study (Community Impact Analysis), Bethel Island Bridge Replacement
Project,Leigh Chavez, Contra Costa Count),Public Works Department Planner III,February
2002
11. Location Hydraulic Study and Floodplain Encroachment Study, Bethel Island Bridge
Replacement Project,Bill Fernandez,Public Works Department Senior Engineer,May 2002
12. Draft Relocation Impact Study and Last Resort Housing Plan, Bethel. Island Bridge
Replacement Project, Crossroads Right of Way, June 11, 2002
13. Phase I Environmental Site Assessment, Subsurface Consultants, Inc., July 26, 2001
14. Phase U Environmental Site Assessment, Fugro West, Inc., February,.
15. Bethel Island Community Web Page
16. Bridge Consultant Project Schedule and Work Window Justification,Russ Nygaard,Earth.-
Tec, May 2003.
17. Contra Costa County Orthophoto and GIS data, Bethel Island area .
18. Letter to Bill Fernandez,Associate Civil Engineer,Bethel Island Fire Protection District;July
21, 1998
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 5 of 36
DETERMINATION
On the basis of this initial evaluation:
_ I find that the proposed project COULD NOT have a significant effect on the environment,
and a NEGATIVE DECLARATION will be prepared.
✓ I find that although the proposed project could have a significant effect on the environment,
there will not be a significant effect in this case because the mitigation measures described on"
an attached sheet have been added to the project. A MITIGATED NEGATIVE
DECLARATION will be prepared.
I find that the proposed project.MAY have a significant effect on the environment, and an
ENVIRONMENTAL IMPACT REPORT is required.
I find that the proposed project MAY have a significant effect(s)on the environment,but at
least one effect (1) has been adequately analyzed in an earlier document pursuant to
applicable legal standards, and (2)has been addressed by mitigation measures based on the
earlier analysis as described on attached sheets, if the effect is a "potentially significant
impact" or "potentially significant unless mitigated." An ENVIRONMENTAL EVIPACT
REPORT is required, but it must analyze only the effects that remain to be addressed.
I find that although the proposed project could have a significant effect on the environment,
there WILL NOT be a significant effect in this case because all potentially significant effects
(a)have been analyzed adequately in an earlier EIR pursuant to applicable standards and(b)
have been avoided or mitigated pursuant to that earlier EIR,including revisions or mitigation
measures that are imposed upon the proposed project.
Signature Date
a5. V h CY05 CCC Communitv Development Department
Printed Name For
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 4 of 36
t
10. Other public agencies whose approval is required (e.g., permits, financing approval, or
participation agreement): U.S. Army Coifs of Engineers Nationwide Permit, Regional
Water Quality Control Board Section 401 Water Quality Certification, California Department
of Fish and Game (Streambed Alteration Agreement), U.S. Fish and Wildlife Service
(Informal Section 7 Consultation), National Marine Fisheries Service (Informal Section 7
Consultation), Reclamation District 799 Perrtut, Bethel Island Municipal Improvement
District Permit, State Lands Commission Lease Agreement, FHWA/Caltrans (NEPA
clearance).
ENVIRONMENTAL FACTORS POTENTIALLY AFFECTED:
The environmental factors checked.below would be-potentially affected by this project,involving at
least one impact that is a "Potentially Significant Impact" as indicated by the checklist on the
following pages.
_ Land Use and Planning _ Transportation/Circulation Public Services
_ Population and Housing X Biological Resources _ Utilities and Service
Systems .
Geological Problems _ Energy/Mineral Resources Aesthetics
Water X Hazards — Cultural Resources
Air Quality _ Noise _ Recreation
_ Mandatory Findings , No Significant
of Significance Impacts Identified
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 3 of 36
Support piles for the new bridge will be installed v✓ithin the slough,beyond the south. levee;
and in the north levee. Although design of the replacement bridge requires that the new
bridge be longer and wider to accommodate current design standards, the bridge has been
designed specifically to avoid major impact to the. downtown Bethel Island community by
locating the new bridge in essentially the same location as the old bridge. Figure 3 delineates
the expected limit of impact as a result of construction activities associated with the bridge
replacement project.
Construction of the bridge will occur over two construction seasons. The eastern half of the
bridge will be constructed during the 151 construction season and the western half of the
bridge will be constructed during the 2°d season. Bridge construction will be divided into
four distinct phases. The first three phases will be conducted during the first construction
season and the fourth phase will be conducted the following summer. The first phase will-
consist of the construction of a raised access road on the southeastern side of the.bridge.
Phase two of the project will consist of construction of the eastern half of the new bridge.
Phase three will include detouring one lane of traffic onto the new bridge and completion of
the eastern half of the.bridge at the north abutment. During phase four, two lanes of traffic
will use the new bridge while the existing bridge is removed and the remaining western
portion of the new bridge is constructed. In order to ensure adequate emergency access
during construction, the bridge engineer has designed the construction phasing to
accommodate one lane open in each direction continually during construction.
In order to construct the new bridge,property acquisition is required including partial parcel
acquisition, slope easements, and temporary construction easements in the vicinity of the
project. Relocation of residential and business occupants may also be required. The project
may require conforming and/or relocation of several driveways. Real Property transactions
necessary to construct the replacement bridge may affect a number of parcels including:APN
031-091-011, APN 031-093-034,APN 031-093-027,APN 031-093-028,APN 031-093-018,
APN 031-093-025, APN 031 -093-026, APN 03.1-093-035, APN 032-140-015, APN 032-
140-012,APN 032-33.0-010,and APN 032-112=004. Driveway conforms maybe necessary
on.APN 032-130-022, APN 032-330-027 and APN 032-330-010. In addition, following
completion of the project, further real property transfers, such as dispensation of surplus
property,may occur.
9. Surrounding Land Uses and Setting: Land immediately surrounding the project area
consists of business uses generally tied to.the
marina industry.
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
Page 2 of 36
Environmental Checklist Form
1: Project Title: Bethel Island Bridge Replacement Project
2• Lead Agency Name and Address: Contra Costa County Corrimur ity Development
Department
651 Pine Street, North Wing - 4th Floor
Martinez, CA 94553
3. Contact Person and Phone Number: Leigh Chavez (925) 313=2366
4, Project Location- The project site is located along Bethel Island'Road
over .Dutch Slough in the east.Contra Costa County
area. Bethel Island Road is tli& orily access to Bethel
Island.
5. Project Sponsor's Name/Address: Contra Costa County Public Works Department
6. General Plan Designation: Public:/Semi-public roadway, (Marina Commercial,
Local Commercial land use.adjacent to roadway)
7. Zoning: Existing Arterial Road
8. Description of Project:
The Contra Costa County Public Works Department is proposing to replace the Bethel Island
Bridge, located in the east Contra Costa County area (Figures 1, 2). The bridge has been
categorized as"functionally obsolete"by Caltrans and the replacement has been determined
to be necessary in order to replace the aging wooden structure with a new concrete structure
according to current design standards: The existing bridge,built in 1948,is 460 feet long and
.28 feet wide. 11 consists of a concrete deck over a wooden substructure,contaimng 25 bents.
The bridge currently has two 11-foot lanes, two narrow sidewalks, and no shoulder area.
The project consists of constructing a new approximately 800-foot long, 50-foot wide bridge
with two 12-foot lanes, a 12-foot left tum lane at the south end,two 5-foot shoulders,two 5-
foot sidewalks,barrier railings and a pedestrian staircase. 'Based on the increased length of
the bridge, the project also includes constntcting a raised access road between the bridge
approach and the levee on the south side for general and emergency'access. The extended
length of the bridge will also require constraction of a wall varying in height from 2 to 25
feet for roughly 450 linear feet along the southwest corner of the project site.
Bethel Island Bridge Replacement Project
Mitigated Negative Declaration
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the expected limit,of impact as a.result,of construction activities associated with.the bridge
replacement project I
Construction of the. bridge will.occur'.over two construction seasons. ;The:easterh half;of the
bridgewill be constructed during fhe Vconstruction season and the western half'.of the
bridge will be constructed during the 2"d season. Bridge construction will.be:divided into four
distinct phases. The`first three phases will be conducted during the first.construction season
and the fourth phase will ,be.6onducted the following summer. The first phase will.corisist of
the construction.of a raised access road on the southeastern side of the bridge. Phase_ two .
of the project will consist of construction of the eastern half of the new';bridge... Phase three
will include detouring one lane. of traffic onto the new bridge' and completion-of the.eastern
half of the bridge: ;t the north.abutment. During phase four; two.lanes of traffic will:use the
new.bridge while the existing-'bridge is removed and. the remaining westernportion:of the .
new bridge is. constructed: In order to ensure adequate emergency access during
construction, the, bridge engineer= has designed the construction.; phasing. to'accommodate
one lane open in each direction:continually'during.construction;
In order to. construct the new bridge;. property acquisition is. required including- partial i parcel
acquisition, slope easements; and.temporary construction ease ts ,will be:needed;in the
vicinity of the project '(Figure 4).. Relocation of residential and business.occupants.ma,y alto
oe required: The Project may. also require conforming and/relocation ;of several driveways..
Real Property. transactions necessary.to construct the%,.replacemenO bridge may affect a
number of parcels..including: APN 031--091. .-011, APN 031 093=034, APN 03'1-093-027-.,;Ai.P,N
031-093-028; APN.�,031-093-01'8, APN 031=093-025,.APN 031=093-026; APN 031=093-035,
APN 0.32-140=015, APN 032=.140-012, APN 032-330-010, and APN. 032-112-004:. Driveway
conforms may. be necessary on APN, 032-130-022, APN 032-330-027 and:APN 032-330=
010. In.addition, ;following completion of the project, further real property transfers, such as
dispensation.of surplus property, may occur. t
2. Location:.The project is located along. Bethel Island Road 'over Duteh Slough in'the east
Contra Costa CouritV area. Bethel:Island Road is,the only.access to Bethel.Isla hd
3. Does it appear that any, feature of the, project will generate significant public concern?
[] yes .[X] no. ( 1.maybe (Nature of concern): l:
4. Will the project require approval`or permits by:-other than a Countyagency7
[ X ] yes [ ] no Agency Name(s) U.S. Army Corps of. Engineers Nationwide Permit,
Regional Water Quality.Control Board Section.401Wafer :Ouality Certification, California
Department of Fish and Game (Streambed Alteration .Agreement), U.S. Fish and Wildlife
Service (Informal Section 7 Consultation), National. Marine Fisheries Service .(Informal
Section 7 Consultation), Reclamation District 799 .Permit', Bethel Island Municipal
Improvement District Permit, .State Lands Commission Lease'Agreement, FHWA/Caltrans
,
(NEPA clearance).
5. Is the project within the Sphere of Influence of any city?. No
G:GrpData\Enviro\2000Projects\Bethellslandbridge\Initial Study cover
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