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Home My WebLink AboutMINUTES - 02142006 - C.3 3 TO: BOARD OF SUPERVISORS c?_sE-L °� Con a FROM: MAURICE M. SHIU, PUBLIC WORKS DIRECTOR `s Costa ot _ DATE: FEBRUARY 14, 2006 County srA-coaN`� SUBJECT: APPROVE the Addendum to the Bethel Island Bridge Replacement Project Mitigated Negative Declaration in compliance with the California Environmental Quality Act. Bethel Island area. (District V) [CDD-CP# 03-36] Project No. 0662-6R4043. SPECIFIC REQUEST(S)OR RECOMMENDATION(S)&BACKGROUND AND JUSTIFICATION RECOMMENDED ACTION: APPROVE the Addendum to the Bethel Island Bridge Replacement Project Mitigated Negative Declaration in compliance with the California Environmental 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 DIRECT the Director of Community Development to file the Notice of Determination with the County Clerk, and Continued on Attachment: ® SIGNATURE: RECOMMENDATION OF COUNTY ADMINISTRATOR ❑ RECOMMENDATION OF BOARD COMMITTEE [APPROVE OTHER SIGNATURE(S): ACTION OF BO ON �YK >/y APPROVED AS OMMENDED JZ --+CJTHER ❑ VOCE OF SUPERVISORS V UNANIMOUS(ABSENT �� ) I hereby certify that this is a true and correct copy of an action AYES: NOES: taken and entered on the minutes of the Board of Supervisors on ABSENT: ABSTAIN: the date shown. LC: y G:\GrpData\EngSvc\Enviro\BO\2006\(02-14-06)CEQA-Bethel Addendum to MND ATTESTED: Orig.Div:Public Works(Environmental Section) JOHN SWEETEN, Clerk of the bard of§upervisors and County Contact: L.Chave,-,(313-2366) cc: Administrator—Ann.G Kuevor Administrator Auditor-Controller Community Development—K.Piona Public Works: Construction By Deputy Design—N.Leary IF Environmental—L.Chavez SUBJECT: APPROVE the Addendum to the Bethel Island Bridge Replacement Project Mitigated Negative Declaration in compliance with the California Environmental Quality Act. Bethel Island area. (District V) [CDD-CP# 03-36] Project No. 0662-6R4043. DATE: February 14, 2006 PAGE: 2 of 2 RECOMMENDED ACTION (con't): AUTHORIZE the Public Works Director to arrange for payment of a $25 fee to Community Development for processing and a $25 fee to the County Clerk for filing the Notice of Determination. FISCAL IMPACT: The estimated project cost is $7 million funded by Highway Bridge Rehabilitation and Replacement Program Funds (80%) and Local Road Funds (20%). REASONS FOR RECOMMENDATIONS AND BACKGROUND: The Bethel Island Bridge Replacement Project Mitigated Negative Declaration evaluated the proposed project which consists of replacement of an existing aging wooden bridge with a new concrete structure according to current design standards. Asa result of the complexity of the bridge replacement project,several minor technical changes to the project have been determined to be necessary during detailed project design. These minor technical changes will require real property transactions beyond those originally analyzed. The Addendum to the Mitigated Negative Declaration addresses the minor technical changes and real property transactions necessary. The adopted Mitigated Negative Declaration and the Addendum are attached. CONSEQUENCES OF NEGATIVE ACTION: Delay in approving the addendum will result in a delay in the Department's ability to move forward with Real Property transactions, which would delay implementation of the project. ADDENDUM 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 heft 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. 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 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; 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 G:\GrpData\EngSvc\ENVIRO\TransEng\Bethel Island Bridge\Neg Dec Addendum.doc 1 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 1 st 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 2003 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. G:\GrpData\EngSvc\ENVIRO\TransEng\Bethel Island Bridge\Neg Dec Addendum.doc 2 ADDITIONS TO THE MND This section identifies the language which is added and/or changed (bold face type) or deleted (c Rkeou) to the text and figures of the MND. The environmental impacts are discussed in "Environmental Initial Study: Bethel Island Bridge Replacement Project, dated July 1, 2003 (attached) and filed on November 5, 2003. The changes below pertain to the document referenced above. 1. Road Detours Page 1, end of the 2nd Paragraph (Project Description): In order to accommodate local traffic during construction of the permanent Bethel Island Road — Wells Road intersection, a temporary Wells Road detour will be constructed to allow traffic to travel around the roadwork. The _ Wells Road detour will be approximately 1,000 feet long and 20 feet wide and will be paved to ensure adequate access. The detour will be located on APN 032-112-004, but 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 parcel. This temporary Wells Road detour will be removed prior to completion of the project and the underlying area will be returned to its original 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 Island Road. The temporary Bethel Island Road detour will be 26 feet wide and 850 feet long and will be paved. The detour road will be constructed on APNs 032-330-010, 032-330-027 and 032-130-022. The detour road will be constructed immediately adjacent to Bethel Island Road to minimize the detour road'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 from construction of the two temporary detour roads. 2. Utility Relocations Page 34, end of the 1 st Paragraph (Utilities and Service Systems): In order to clear the work zone to allow for construction of the new bridge, overhead electric lines G:\GrpData\EngSvc\ENVIRO\TransEng\Bethel Island Bridge\Neg Dec Addendum.doc 3 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 existing 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 Bethel Island Road embankment and relocation of the sewer force main onto the new bridge. The utility modifications necessitated by the bridge replacement work will 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 1 st Paragraph (Biological Resources): Rather than outfalling 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 is not 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 maybe necessary in support of the drainage work along Bethel Island Road. No new significant impacts will result from installation of the outfall. Page 23,4 th 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 Riverview Place. The drainage inlets will be installed in an area that was already expected to be disturbed by the project. G:\GrpData\EngSvc\ENVIRO\TransEng\Bethel Island Bridge\Neg Dec Addendum.doc 4 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 extended length of the bridge will alSe Fequ*FG GenGtFUGtlon of a wall vaFying in height frorn 2 to 25 feet f9F Feughly 450 linear feet a!Gng the Se ithWeSt GGFRer of the pFejeGt site, The extended length of the bridge 'will also require construction of a 2:1 embankment fill slope along the southwest corner of the site matching 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, 3rd Paragraph (Aesthetics): Th, extended lengthof bridge Will roniiro GenGtFUGtien ef a meGhaniGally stabilized eaFth (MSF=)wail vaFying OR height from 2 to 25 feet fel;Feughly 450 lineaF feet aleRg the seuthweSt GGFner of the pFGjeGt site. Thewall will MaFt approximately 250 foot south of the eFthGFn leyeo and—exted to appFeximately 700 feet seuth Gf the levee. Although the wall will be fairly tall, t RE)t s 4)the wall will be lOGated adjaGent tG two existing busine sses (FatheF than Fesi-d---------,', 2)the bus;nesslGGated at the tallest pGint ef the wall does Rot have jews faGiRg the 3) based Gn the GUFFent IGGatien ef beat GteFage, the view of the wall wall r wall;the wall tapeFs dewn will view the wall at a height vaFying between 5 and 10 feet, and 5) textu Fed fiRish)to ensuFe that the wall as ae6thetiGally pleasing. The— is--esidenGe IGGated in an aFea that may have at least a partial view Gf the FetaiRiRg , that s The extended length of the bridge will require construction of an earthen 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. G:\GrpData\EngSvc\ENVIRO\TransEng\Bethel Island Bridge\Neg Dec Addendum.doc 5 Real Property transactions will be necessary to allow for construction of the embankment; however, the embankment 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 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 piling 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 prevents 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, the existing 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 under 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 pile 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 installation distance, and comparatively quiet press- in installation method, noise impacts as 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. G:\GrpData\EngSvc\ENVIRO\TransEng\Bethel Island Bridge\Neg Dec Addendum.doc 6 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. G:\GrpData\EngSvc\ENVIRo\TransEng\Bethel Island Bridge\Neg Dec Addendum.doc 7 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 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 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:\GrpData\EngSvc\ENVIRO\TransEng\Bethel Island Bridge\Neg DecAddendum.doc 8 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. ® 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: ® County Clerk-$50 Public Works Department Total Due: $50 255 Glacier Drive Total Paid $ Martinez, CA 94553 Attn: Leigh Chavez Receipt#: 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. ® 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: ® County Clerk-$50 Public Works Department Total Due: $50 255 Glacier Drive Total Paid $ Martinez, CA 94553 Attn: Leigh Chavez Receipt#: i I 1 � � u 1 z �V I =' o m o ii � � 1 a c � O ;� zn` ! Q� CU t w cn I ' w U U m a Ci W L T d C O— iU H d 1 U • I7(5 (D-) C) m c- 4 m o I E 4—j a o nl �� lLJ o$ I W 'O t� O 00 m K N C m C W Mo I W 3:m m CALIFORI ENVIRONMENTAL QUALIT . ACT NOTICE OF DETERMINATION JAN 12 2004 CONTRA COSTA COUNTY COMMUNITY DEVELOPMENT DEPARTMENT;z':j;j ,�t �j;,��,� „�,•AL 651 PINE STREET 4TH FLOOR NORTH WING MARTINEZ, CALIFORNIA 94553'=009b 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.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 at 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 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.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 2nd season. 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 orderto 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 also require conforming and/or relocation of several driveways.Several boat slips on the northeast side of the bridge maybe 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 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. 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 mitigat7f1-11TU 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: � !, NOV riltj. Community Development Department Representative I S.L.. EiR, OOUN CLERKNTRA i AFFIDAVIT OF FILING AND POSTING C .11 ,i BY I declare that on 140VO� ® `� �oQ� I received and posted this no"ice P�Tc � California Public Res urces Code Section 21152(c). Said notice will remain posted for 30 days from the filing da DEPUTY COUNTY-CLERK Signature Title Applicant: Public Works Department Department of Fish and Game Fees Due: Total Due: $ 255 Glacier Drive X Neg Dec-$1,250 Total Paid $ Martinez,CA 94553 Attn:Leigh Chavez X County Clerk-$50 Receipt#: G:\GrpData\EngSvc\ENVIRO\2000projects\BethellslandBridge\NOD .y CONTRA PUBLIC WORKS DEPARTMENT 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: �G DATE: $'- - 05 RECOMMENDATIONS: Q 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#: F27 Parcel # 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 Figure 1 a " ..... rl 4 t J L 1 7tt' ;a m J}V o ht m i r*l O TO , { a 0 j�'� Q) 7° II ti kwM0.4 � N f L rel 1 ' O JI V/ (9 2 11 •\/ U p ILI ti U PZQ, / J zCD `° If L �1 a) RIO CLfit o � maqgv st' ids w .t r" U- ddb din j 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 1St construction season and the western half of the bridge will be constructed during the 2nd 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 will be needed in the vicinity of the project (Figure 4). Relocation of residential and business occupants may also be required. The project may also require conforming and/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 031-093-1728, APN 031-093-018, APN 031-093-025, APN 031-093-026, 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, following completion of the project, further real property transfers, such as dispensation of surplus property, may occur. 2. 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. 3. Does it appear that any feature of the project will generate significant public concern? [] yes [X] no [] maybe (Nature of concern): 4. Will the project require approval or permits by other than a County agency? [ X ] yes [ ] no Agency Name(s): U.S. Army Corps 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 Permit, Bethel Island Municipal Improvement District Permit, State Lands Commission Lease Agreement, FHWA/Caltrans (NEPA clearance). S. Is the project within the Sphere of Influence of any city? 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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 the only 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. 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. Bethel Island Bridge Replacement Project Mitigated Negative Declaration Page 1 of 36 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 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 I" construction season and the western half of the bridge will be constructed during the 2°6 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 southeastem 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 ofparcels 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 032- 140-012,APN 032-330-01.0, 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 manna industry. Bethel Island Bridge Replacement Project Mitigated Negative Declaration Page 2 of 36 10. Other public agencies whose approval is required (e.g., permits, financing approval, or participation agreement): U.S. Army Corps 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 Permit, 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 proj ect,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 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 RvIPACT 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 IM?ACT 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 � I 6 -nmentry `S, (�� .S CCC Community DeveloDepartment Printed Name For Bethel Island Bridge Replacement Project Mitigated Negative Declaration Page 4 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: 1. 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, 1999 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 2001 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 County 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 II Environmental Site Assessment, Fugro West, Inc., February, 2003 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 EVALUATION OF ENVIRONMENTAL IMPACTS: Potentially Significant Potentially Unless Less than Significant Mitigation Significant No Impact Incorporation 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 _ _ X 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 in 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 will 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 Mitigated Negative Declaration Page 6 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 longer and wider than the existing bridge. The northern end of the new bridge will touch down and return to existing road grade in 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 Caltrans' 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 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. This 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 450 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 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 of 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 of the 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 Incorporation Impact LMpact H. 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 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 County Important Farmland Map(1998)identifies the proj ect as being within"urban and built-up land". "Farmland of Local Importance"surrounds the urban and built up areas according to the Important Farmland 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 M. 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 substantial _ _ X _ pollutant concentrations? e. Create objectionable odors affecting a — _ X _ substantial number of people? SUMMARY: Less Than Significant Impact. Short-term emissionsand 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 properly tuned and muffled equipment and the elimination of unnecessary idling of equipment when not in use. Implementation 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. No permanent 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 bridge 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 IV. BIOLOGICAL RESOURCES. Would the project: a. Have a substantial adverse effect, either _ _ X _ 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 native resident 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 Potentially Significant Potentially Unless Less than Significant Mitigation. Significant No Impact Incorporation Impact Impact 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? SUMMARY: 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. Withinn this habitat type, 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 %o) of weedy species such as dock (Rumex sp.), thistle (Circium sp.), willow weed (Epilobium sp.), and crab grass (Digitaria sanguinalis). Typical animal species 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.S. 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 of Fish 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 (Lemna sp.) and cattails (Typha latifolia). The banks of the drainage ditch support hoary nettle (Urtica diocia), Bermuda grass (Cynodon Bethel Island Bridge Replacement Project Mitigated Negative Declaration Page 11 of 36 1 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 nprap and the majority of the associated vegetation is weedy and sparsely scattered. Vegetation in the area consists of turkey mullen (Eremocarpus setiferum),pampas grass (Cotaderia 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 (Raphanus sativus); and palm (Washingtonia filiferd). 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 (Didelphis marsupialis), 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 pyrrhonota)nests were identified along the length of the 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. It is also possible, but 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 it 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 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 a potential 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,implementation 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 transpacificus), a state and federally listed endangered fish. In addition, Dutch Slough has potential habitat for state threatened and federally proposed endangered spring run salmon (Onocorhynchus tshawytscha), state endangered and federally endangered winter run salmon (Onocorhynchus tshawytscha), 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 (Spirinchus thaleichthys), river lamprey(Lampetra ayresi), and Pacific lamprey(Lampetra tridentate). The slough also falls within an area categorized as Essential 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- NUTS), 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 resource agencies to assist with project planning. 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 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 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 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 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 The project description has also been designed to include a number of additional measures that will further minimize impacts to these sensitive fish species. In particular, to avoid potential impacts to fish spawn and/or fry, all in-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 agreed 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 be at 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 the project 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 description, it is expected that consultation with the resource agencies will be informal and the project will be deemed not likely to adversely affect the listed fish species (pers. com. 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 project. 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 Potentially Significant Potentially Unless Less than Significant Mitigation Significant No Impact Incorporation Impact Impact V. CULTURAL RESOURCES. Would the project: a. Cause a substantial adverse change in the _ _ 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 cemeteries? SUMMARY: Less Than Significant Impact. A records search conducted by the Northwest Information Center(KWIC) 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, NWIC recommended further archival and field study by a qualified archaeologist. As a result of the NWIC recommendation, the County hired 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 eligibility 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 Bridge itself. Although the bridge is a typical example of post-World War H 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 Based on the lack of evidence of archaeological resources and the determination that neither the residential and business structures, nor the bridge 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 Unless Less than Significant Mitigation Significant No Impact Incomoration 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 d. Be located on expansive soil, as defined 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 supporting _ _ _ X the use of septic tanks or alternative waste disposal systems where sewers are not available for the disposal of waste water? SUMMARY: Less Than Significant Impact. The 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,the 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 Superficial grading of the 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 proj ect in order to stabilize exposed soil. 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 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 not 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 riprap. Potentially Significant Potentially Unless Less than Significant Mitigation Significant No Impact Incorporation Impact Impact VII. 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 Imnact 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 _ _ _ 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 result in a safety hazard for people residing or working in the project area. f For a 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 U 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 H 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 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 1) 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 H 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 H 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 H 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 II 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 II 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 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 supplies _ _ 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)? C. Substantially alter the existing drainage _ _ X _ pattern of the site or area,including through the alteration of the course of a stream or 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 or amount of surface runoff in a manner which would result in flooding on-or off-site? e. 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 Potentially Significant Potentially Unless Less than Significant Mitigation Significant No Impact Incorporation Impact 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 Significant 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, theproject 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 will not 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 quantity 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 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. The existing bridge pilings will be removed such that 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 during 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 incorporated 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 Water Quality Control Board (RWQCB)prior to construction of the project. Special conditions required by the certification will be complied with during construction in Bethel Island Bridge Replacement Project Mitigated Negative Declaration Page 23 of 36 order to minimize the possibility of water quality impacts. Potentially Significant Potentially Unless Less than Significant Mitigation Significant No Impact Incomoration Impact impact IX. LAND USE AND PLANNING-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 purpose of avoiding or nutigating an environmental effect? C. Conflict with any applicable habitat _ _ _ X conservation plan or natural 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 t6 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. The Bethel Island Bridge is already in place; therefore, constructing the replacement bridge in approximately the same location will not further physically divide an established community. The project will not result in a substantial alteration of the 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 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 5-9); 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 5715). 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 bridge 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 four 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 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 031-091-011, 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 Potentially Significant Potentially Unless Less than Significant Mitigation Significant No Impact Incorporation Impact Impact 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. XI. 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 Potentially Significant Potentially Unless Less than Significant Mitigation Significant No Impact Incorporation Fact 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 to 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 businesses. Construction activities will increase the noise level in 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 replacement 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 15 — 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 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 not have to occur at nighttime (when it 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 Impact 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 numbers of people, _ _ X 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 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 Impact 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 031-091-011, 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 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 fact Incorporation Fact 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 environmental impacts, in order to maintain acceptable service ratios,response times.or other performance objectives for any of the public services: Bethel Island.Bridge Replacement Project Mitigated Negative Declaration Page 29 of 36 Potentially Significant Potentially Unless Less than Significant Mitigation Significant No Impact Incorporation Impact Impact 1. Fire Protection? _ X _ 2. Police Protection? _ X _ 3. Schools? X 4. Parks? — _ X 5. Other Public facilities? — X SUMMARY: Less Than Significant 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 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. 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 periodic maintenance of road improvements will continue to be performed by the County. Potentially Significant Potentially Unless Less than Significant Mitigation Significant No Impact Incorporation lml)act Impact 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 on 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 bridge. 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 boat 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 Potentially Significant Potentially Unless Less than Significant Mitigation Significant No Impact Incomoration 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 intersections)? 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? _ _ _ X g. Conflict with adopted policies,plans, or _ _ _ X programs supporting alternative transportation (e.g.,bus turnouts,bicycle racks)? SUNEVIARY: 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 by 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 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 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. 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 the 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 corner 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 Impact Incorporation Impact Impact 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 Potentially Significant Potentially Unless Less than Significant Mitigation Significant No Impact Incorporation fact Impact XVII. 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 history 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? SUMMARY: 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. In 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 any given 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 In accordance with the recommendations in the Phase II 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\2000Proj ects\Bethellsland\NEGDEC Bethel Island Bridge Replacement Project Mitigated Negative Declaration Page 36 of 36 STATE OP CALIFORNIA—BUSINESS TRANSPORTATION AND HOUSING AGENCY GRAY DAVIS Governor DEPARTMENT OF TRANSPORTATION P. O. BOX 23660 OAKLAND, CA 94623-0660 (510) 286-4444 Flex your power! (510) 286-4454 TDD Be energy efficient! September 18, 2003 CCO04729 CC-4-834.92 SCH2O03082087 Ms. Leigh Chavez, Planner III 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 examined 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 (5 10) 622-5491. Sincerely, TIMOTHY U. SABLE District Branch Chief IGR/CEQA c: Scott Morgan (State Clearinghouse) `Caltrans improves mobility across California' CC- 20 03 ch,0N) 09 : 06 DAN .11 &6 YACHT CENTER, INC Ir,/r.n l'' �riu;rc ,riiirr 1y74 September 22, 2003 Leigh Chavez, Planner III Contra Costa County Public Works Department 255 Glacier Drive Martinez, Ca. 94553 Dear Mr. Chavez, I am the managing o er of the properties at 6050 Bethel Island Rd. We are at the base of the current Bethel Island Bridge I am concerned about the impact to our business with the new bridge proposal 1 coming within severe feet of our sales ilding. I am c ceed that the dirt, residue and noise from the project will effectively close our businesss.:Furth ermore wm e 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 yachts in this area and it would be very difficult at best to keep them clean during constri ction and with the bridge coming so close to us I am concerned for the long- term impact-1 Ilam also concerned that the bridge being so close to our building would destabilize our current structure and possibly render it unusable. We would have significant vibration with every vehicle crossing the `3 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 we currently have would be a potential solution Does the bridge have to have two walkways? I do not know why two walkways would be necessary �} considering that there is not much for people to walk to on both sides of the roadwar�l also would like to make sure that a new bridge would be tall enough to have normal height vessels able to go under itO Ma vessels 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 existing one to eliminate the down& time.for traffic during construction. Has this been considered` , �J I would like to have a meeting to discuss the Impact that a new, wider bridge would have on the viability of our business. Please call me at 510 282-8255 to set up a convenient time to meet. I appreciate your attention to this matter. S1 cerely, Wayne.D'Anns I President & managing property owner , Cc: Ernest Pierucci, esq. O OAKLAND Phone S10.451.7000, Fax 510.451.7026 Oakland Estuary, 11 Embsrcadero West, Suite 100, Oakland, CA 94607 O Bc-THEL ISLAND Phone 925.884.3720. Fax 925.684.9071 B.I. Marina Reson, 6050 Bethel Island Rd., Box 1870, Bethel Island, CA 94511 0 NEWPORT BEACH Phone 949.723-4506. Fax 949-723.4501 1-Ido Marina Village, 3400 Vla Oporto, Suite 101, Newport Beach, CA 92663 Ronald Keil 1741 Carl Road Rescue, CA 95672-9604 ` ' ��'` '� V- P�9 530-672-4222 SEP 1 0 2003 ronkei I@drrecway.com September 3, 2003 ENVIRONMENTAL Contra Costa County Public Works Department Attn: Environmental (OPG 4523) 255 Glacier Drive Martinez, CA 94553 Pe: County file # CP 03-36 or parcel # 030 020 043 Derr Gentlepersons: We own property on 4238 Stone Poad, 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 Posemar Ave San Jose, CA 95127 Please send any future correspondence to us at our new Rescue address indicated above. Sincerely, Donald Keil Mau Contra Public Works Department Public or sDi Public Works Director Costa 255 Glacier Drive R.Mitch Avalon CountMartinez, CA 94553-4825 Deputy Director County Telephone: (925) 313-2000 Julia R.Bueren FAX: (925) 313-2333 Deputy Director Web site:www.co.contra-costa.ca.us/depart/pw October 23, 2003 Patricia R.McNamee Deputy 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: 0662-6R4043 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 during 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 lengthy breaks every day between pile driving 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 piles during 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 revegetated 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 to 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 actual 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 dewatered 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. Mr. Wayne D'Anna 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 in 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. 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; 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 Ichavezaapw.co.contra-costa.ca.us or Neil Leary at (925) 313-2278 or nlea ry(a)pw.cc.contra- costa.ca.is if you have questions regarding the project. Thank you. Sincerely, Lei havez Planner III Engineering Services LC:gpp G:\GrpData\EngSvc\ENVIRO\2000 projects\Bethel Island Bridge\D'AnnaResponse.doc cc. N. Leary, Design B. Fernandez,Transportation E.Whan, Engineering Services C. Sellgren, Engineering Services s 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. 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 at 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 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.Construction of the bridge will occur over two construction seasons. The eastern half of the bridge will be constructed during the 15( construction season and the western half of the bridge will be constructed during the 2nd season. 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 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 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 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. 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 mitigation measures ( ) 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: Public Works Department Department of Fish and Game Fees Due: Total Due: $ 255 Glacier Drive X Neg Dec-$1,250 Total Paid $ Martinez,CA 94553 Attn:Leigh Chavez X County Clerk-$50 Receipt#: G:\GrpData\EngSvc\ENVIRO\2000projects\BethellslandBridge\NOD