HomeMy WebLinkAboutMINUTES - 03211989 - 2.6 TO: BOARD OF SUPERVISORS, AS THE GOVERNING BODY OF THE
CONTRA COSTA COUNTY FLOOD CONTROL AND WATER
CONSERVATION DISTRICT
FROM: J. MICHAEL WALFORD, CHIEF ENGINEER
DATE: MARCH 21, 1989
SUBJECT: Wildcat and San Pablo Creeks Corps of Engineer Project
Specific Request(s) or Recommendation(s) & Background &
Justification
I. RECOMMENDATION ACTION
A. ACCEPT attached report from Wildcat and San Pablo
Creeks Project Design Team summarizing the final
consensus plan including recommendations that the Corps
of Engineers evaluate a gabion-walled, concrete bottom
channel section on San Pablo Creek between the railroad
tracks and the Board give special recognition to Ann
Riley and Greg Connaughton for their contributions to
the Design Team.
B. ACKNOWLEDGE receipt of letters stating preferences
regarding channel lining type for San Pablo Creek
between the railroad tracks.
C. ACCEPT attached report from the Chief Engineer recom-
mending that the Board reaffirm the Corps of Engineers
approved plan alternative of a concrete channel lining
for San Pablo Creek between the railroad tracks.
D. DIRECT the Chief Engineer to solicit a letter from the
Corps of Engineer indicating their views on each
alternative, the extent of any local funding increase
associated with each alternative and the extent of
flooding potential avoided by constructing the project
in 1990 in lieu of 1991. , -_
Continued on attachment: X yes Signature: % �. ( �A49L_
Recommendation of County Administrator
Recommendation of Board Committee
Approve Other:
Signature(s) :
Action of Board on: MAR 21 1989
Approved as Recommended_ Other
Vote of Supervisors I HEREBY CERTIFY THAT THIS IS
A TRUE AND CORRECT COPY OF AN
_ Unanimous (Absent ) ACTION TAKEN AND ENTERED ON
Ayes: Noes: THE MINUTES OF THE BOARD OF
Absent: Abstain: SUPERVISORS ON DATE SHOWN.
Attested MAR 21 1989
Orig. Div. : Public Works (DESIGN) PHIL BATCHELOR,
cc: County Administrator CLERK OF THE BOARD
County Counsel OF SUPERVISORS AND
Community Development Director COUNTY ADMINISTRATOR
Public Works Director
PW Design By v
PW Accounting DEPUTY CLE Z
MFK:GC:bb:pg
bo: 21.t3
Wildcat-San Pablo Creeks
BO:21.t3
Page 2
E. ACKNOWLEDGE completion of the task of the Wildcat San
Pablo Creeks Project Design Team, THANK Jim Cutler of
the Community Development Department for chairing the
Design Team, DIRECT the Public Works Director to
prepare certificates of appreciation for all members of
the Design Team, AUTHORIZE Supervisor Tom Powers to
sign the certificates on behalf of the Board, and
CONVEY special recognition to Ann Riley and Greg
Connaughton for their work.
F. DIRECT the Clerk of the Board to reschedule this issue
before the Board on April 25, 1989, for decision on
whether or not to request the Corp of Engineers to
change the adopted plan for San Pablo Creek between the
railroad tracks to provide for gabion channel walls in
lieu of concrete channel walls and the recommendations
in the Design Team Report.
II. FINANCIAL IMPACT
The Chief Engineers report indicates that the gabion channel wall
will result in higher project costs of approximately $75, 000. 00
and higher future maintenance cost of approximately $3 , 500. 00
annually.
III. REASONS FOR RECOMMENDATION/BACKGROUND
The Design Team has had extensive discussion on the section of
San Pablo Creek between the railroad tracks. Two alternatives
were considered. The first alternative is a rectangular
concrete channel section which is the current Corps of Engineers
adopted plan. The Flood Control District staff recommends this
alternative. This channel is the least costly alternative and is
expected to have a minimal annual maintenance cost. The
rectangular concrete channel will have the least impact on
adjacent property and will provide the greatest flexibility for
subsequent upstream improvements. Finally, if directed to
proceed with design of the rectangular concrete channel, the
Corps of Engineers anticipates a construction start in April,
1990.
The second alternative, which is recommended by the Design Team
for consideration, is a gabion-walled channel with a concrete
bottom. The Design Team expects that vegetation, whether
intentionally placed or not, will grow on the gabions thereby
softening their appearance. However, the Army Corps of Engineers
expects one-quarter to one-third of the channel length between
the railroads will require complete concrete lining to perform
acceptably. Implementation of the gabion alternative will
require an extensive hydraulic model study to identity its affect
upon proposed upstream improvements. The Corps of Engineers
predicts a construction start in May of 1991 for the gabion
alternative due to the increased design time and study.
It is recommended that the Board solicit input from the Corps of
Engineers on this issue before making a decision as to which
alternative should be recommended for implementation. The Board
should know from the Corp of Engineers the estimated local cost
share for each alternative and the extent of potential flooding
in 1990 due to the expected delay in the project for model
testing the gabion channel wall alternative. Soliciting comments
from the Corp of Engineers will require postponing the decision
on this issue until April 25, 1989.
IV. CONSEQUENCES OF NEGATIVE ACTION
The project cannot proceed without a decision on this issue.
CONTRA COSTA COUNTY
COMMUNITY DEVELOPMENT DEPARTMENT
TO: Board of Supervisors DATE: March 15, 1989
FROM: Jim Cutler
Chairman, Wildcat an PabloD�Team
SUBJECT: Final Report
The Wildcat/San Pablo Design Team has completed all of the tasks necessary for
the construction and maintenance of the U. S. Corps of Engineers Flood Control
project. On several previous occasions, the .Committee has brought reports and
issues forward to the Board for its consideration and final determination.
Unless the Board gives the Committee additional assignments, this shall be the
last report of our Committee. The Committee should be sunseted. The Finance
Committee, Chaired by Maria Viramontes of Assemblyman Campbell 's office, is
still active .and is working to offset project costs.
This final report covers 6 areas, each of which is addressed individually below:
1. The Maintenance .Master Plan
The last major effort of the Committee was the development of a maintenance
Master Plan for the Wildcat/San Pablo Flood Control project. It provides
detailed instructions to County staff for the maintenance of these
projects. In our opinion, it is unique and ,may serve as a forerunner to
other efforts throughout the State. The Corps of Engineers, County Flood
Control staff, and the regulatory agencies are to be commended on the
cooperative efforts to prepare a plan that all can live with. A copy of
the plan is Attachment A to this report. This plan outlines performance
criteria for maintaining the creeks and discusses contingencies to be used
if the facility doesn't work exactly as designed.
We request that the Board of Supervisors accept this plan.
2. Assurances the Plan will be built as designed.
Historically, there were charges that construction on this project wasn't
being done according to the approved plans and thus led to less than
favorable publicity for the County and the Corps of Engineers. The Design
Team has put in place an impressive array of safeguards to insure the
project proceeds as planned. While mistakes and accidents do occur, the
County should feel they have gone to great lengths to minimize any future
problems. Among the safeguards are protection for trees which aren't to be
disturbed during the construction process. First, the Corps of Engineers
generally staked the areas to be protected. Next Greg Connaughton, of the
Flood District staff, verified and more clearly staked the areas to be
protected. Lastly, the County's consultant, Phil Williams and Associates,
verified in ,the field, the staked areas for conformity with the approved
plans.
Additionally, according to the County's signed agreement with the Richmond
Unified School District, an arborist will be on-site to direct the
construction work next to the trees which are to be maintained at Verde
School . This is part of the Corps of Engineers construction contract.
In addition to the Corps of Engineers supervision of the project, Flood
Control District staff will have personnel on-site on the average of 3
times a week as a backstop to the Corps efforts.
We feel that the safeguards in place will lead to the project being built
as planned.
3. Phase II Project
Phase I of the Wildcat/San Pablo project constructs improvements from San
Pablo Bay upstream to the Atchison, Topeka & Santa Fe Railroad. Phase II
of the project, as authorized by the U. S. Congress, would provide a
continuation of the project upstream into the City of San Pablo, and the
watershed extents upstream into El Sobrante and into parks and watershed
lands to the east.
The Corps of Engineers is currently committed to undertaking a detailed
hydraulic model study which could lead to a second phase Corps of Engineers
project, if it meets the cost benefits analysis and an acceptable design
can be found.
The Design Team recommends that the County consider establishing a new
committee to work with the Corps of Engineers and the City of San Pablo
upon completion of those studies, if it appears the Corps is interested in
pursuing this Phase II work.
Many of the agencies which were involved in the Design Team process might
be willing to volunteer to participate in such a committee, while others
would not be appropriate due to differing authorities and constituencies.
We recommend the Board direct the Flood Control District staff to bring
this issue back to the Board for consideration if it appears a Phase II
project can be justified. This referral should occur at the onset of the
design process.
4. Buffer Zones
The Design Team recommends that the Board of Supervisors communicate with
the City of Richmond recommending that a 100 foot buffer zone be required
on each side of the Wildcat Creek Flood Control right-of-way for the
"U-Pull-It" project permit (an automobile dismantling yard) . Providing a
buffer to the project will allow for the protection of the facility, will
avoid impacts to the regional trail and will minimize adverse water quality
impacts. For the same reasons, we also recommend that both the County and
Richmond should consider including a 100 foot buffer zone requirement
within all new land use decisions, and permits along the rights-of way of
both creeks to provide for consistency in land use controls. This should
be considered as part of the joint general plan program being developed by
the City and the County for the North Richmond area.
5. Commendations
While all members of the Design Team and staff provided contributions, the
Design Team requested that I bring to your attention two participants whose
efforts were critical to our successful effort:
Greg Connaughton, of Flood Control staff, provided guidance, patience and
direction throughout the lengthy process. He was always there with answers
and direction.
Ann Riley, representing the Urban Creeks Council , served as the Committee's
conscience, always pushing us toward a sound, but environmentally,
sensitive approach.
Their special efforts should be recognized.
6. San Pablo Creek between the railroad tracks
There is one area which the Committee has not finalized a recommendation on
and that is the reach on San Pablo Creek between the two railroad tracks.
This area is constrained by land uses close to the creek. The County's
Work Furlough center and West County Corporation yard constrain the area
available for expansion of the right-of-way. There are significant
archeological resources which need protection in this area. The Design
Team feels that these constraints limit potential design alternatives along
this reach. While the Design Team would prefer a gabion-lined channel
instead of a concrete rectangular channel , they aren't sure that such a
design is feasible. They have not voted for either design approach.
The reason for this inaction is the Corps of Engineers hydraulic model
studies upstream of this site for the Phase II project. The Design Team
felt that it was important to have the results of these studies before a
design concept was finalized along this transition area. This reach design
could affect the nature of upstream work. It would be a shame to lock in a
project which might need to be modified based on upstream potential design
options. The small area which might be subject to flooding and the one,
year potential delay, appears an acceptable risk to insure that a correct
construction decision is made along this reach and for integration upstream
within the project.
We recommend that a decision on design along this reach be withheld until
the Corps hydraulic model studies are complete (potentially a one
construction year delay) .
JWC/jb
Attachment
jwc3/wldcatsp.mem
Attachment A
MAI ATL WCE MAS'T'ER PTII
FCR THE
WIILC..AT-SAN PABLO CREEKS PEACE I PRWEGT
The intent of this maintenance master plan is to sustain the design level of
flood protection while maximizing envie oranental and recreational use of the
creek corridor in a cost effective manner.
The channels are designed to efficiently convey runoff due to storms of 100
year recurrence interval while providing 3 feet of freeboard along
=Itainment levees (levees confining a 100 year water surface with an
elevation greater than the adjacent ground surface) and 2 feet elsewhere.
The channels are also expected to protect the downstream marshes from
degradation due to stream sediment deposition and to provide a riparian
corridor alone, both cre3cs and an anadr=cus fish passage along Wildcat
Creek by ccncentrat=x; low flows in a channel adjacent to the south (left)
bank. Major storm runoff is conveyed by both the lour flow channel and the
flood plain to the north.
The low flow channels are pry to be stable, low maintenance project
elements meant to reestablish and enhance the riparian values lost• due to
channel construction. vegetation established on the south c'kannel bank and
within a 10 foot wide band i=nediately north of the low flow channel is
intended, when mature, to provide a shade canopy to inhibit growth in the
channel area and a soil re;inforcisq root matrix to resist erosion. In
addition, the rkazrow low flow dmmels are expected to produce flow
velocities sufficient to maintain sediments in suspension during most runoff
events thereby minimizing sediment deposition.
' A'c a✓ Flo:.r I
44
f7,o.v Pr's' �fC�y ri oit
fir ,.
Since the low flow channel area is required to,convey a proportionate share
of the Q runoff volume, vegetation removal and pruning will be necessary
to maiAS an unobstructed flow area. , The unobstructed area will be
equivalent in width to the low flow channel top width and will extend
vertically from the adjacent flood plain elevation to the elevation of the
design water surface plus 2 feet. Vegetation in the invert and on the side
slopes of the low flow channel as well as the limbs of canopy vegetation
which project into the unobstructed area Will be subject to pruning or
removal.
Although the channel design concept is similar on Wildcat and San Pablo
Creeks, each creek is expected to perform differently. Wildcat Creek will
be subject to a large sediment load. it is anticipated that the majority of
coarse sediments will accumulate in the stilling basin sited between sta.
95+00 and Sta. 101+00. Fine sediments should remain suspended until
discharge into San Pablo Bay via Castro Slough. However, a sediment load of
unknown magnitude will be deposited in the flood plain and possibly in the
low flow channel areas.. Deposition of this material in the low flow channel
is the Principal concern of maintenance contingency planning for Wildcat
Creek.
The bottom width of the low flow channel on San Pablo Creek is is feet and
10 feet, downstream and upstream of 3rd Street, respectively. ccqouter
models indicate, that under 5 year recurrence runoff conditions, a 40 foot
bottom width is required for a stable low flow channel. Thus, the principal
concern of maintenance contingency planning for San Pablo Creek is the
inherent instability of the low flow channel which may result in serious
erosion.
Sediment ac=elation and channel erosion may occur on each creek.
Therefore, all of the following "General Principals" including the plans
for managing sedimentation and erosion apply to both creeks.
I. General Principles
A. Definition of Adequate Flood protection
Adequate flood protection is considered to be provided if the 100-
year flood level encroaches on the project freeboard by no more
than 50%. Mus criterion is the performance standard which
determines the need for maintenance activity.
B. Flood Plain Maintenarr-e
Notwithstanding the provisions of the above paragraph I.A.
vegetation In the flood plain and on the adjacent north (right)
bank and service road areas will be mechanically mowed whenever it
exceeds a height of 18 inches or as necessary for fire protection
in accordance with the direction of the Fire Marshall.
2
C. liability for Channel
The Flood Control District has sole liability for the channel
improvements and assuring that the channel continues to function
adequately based on the original design.
D. Financing for Maintenance
The funding for the maintenance activities on these creeks is
limited. The District will seek the most cost effective methods
to accomplish the maintenance plan outlined below.
E. Channel Inspection
The Corps of Engineers (Corps) and the Contra Costa County Flood
Control and Water Conservation District (District) inspect the
Wildcat and San Pablo Creek channels in the spring and fall, each
year, to assure adequate maintenance. The annual maintenance plan
is determined as a. result of the spring field review. An advance
notice of the date and time scheduled for the spring field review
will be sent to the agencies and organizations listed in Appendix
A of this plan. A representative of each agency and organization
is welcome to attend the spring field review. A copy of the
annual maintenance plan will be mailed to the agencies having
regulatory or contractural authority over the project.
F. Vegetation and Sediment Management
1. With the exception of containment levees and rock lined
channel sections, riparian trees will be allowed to grow to
maturity on the south bank and within a 10 foot wide
corridor immediately north of the low flow channel.- The
limits of the 10 foot wide vegetation corridor are defined in
Section II. Specific Reaches, of the plan.
2. Tres and other vegetation with root structures capable of
intruding into the structural core will be removed from
containment levees. The structural core is defined as a
trapezoidal prim with a minimum 12 foot horizontal top
width, increasing in horizontal extent by 3 horizontal to 1
vertical on the channel side face and by 2 horizontal to 1
vertical on the landside face and projecting to the landside
ground surface elevation. Affected containment levees on
Wildcat Creek extend from Sta. 37+00 to Sta. 48+00 Rt. and
Sta.. 60+00 to 67+00 Rt. and on San Pablo Creek from Sta.
59+00 to Sta. 62+00 Rt. The roots of existing vegetation
shown to remain and plantings established as part of the
landscaping plan are not expected to violate the structural
core of containment levees.
3
3. With the exception of the Verde School Reach described in
section II, "Specific Reaches" of this plan, no vegetation
will be allowed on rock lined channel surfaces. Refer to
channel cross sections, Appendix B.
4. The District will use labor intensive methods to remove
vegetation and clear debris from the low flow channels if
economical labor resources are available. In order to
facilitate the removal and clearing operations, access
corridors may be provided in the 10 foot wide riparian band
north of the low flow channel by removing a maximum of 15
foot widths of vegetation at a minimum spacing of 100 feet on
center. When vegetation thinning is prescribed, the flood
plains and north bank areas will be mechanically mowed.
Herbicides will not be used for five years after landscaping
installation and will be considered thereafter only in
extreme circumstances when inexpensive hand labor resources
are unavailable.
5. Maintenance outside the areas noted above in paragraphs
I.B. , I.F.1., I.F.2 and I.F.3 will be carried out in
accordance with a prescribed maintenance plan developed
pursuant to an annual field review and the following
described program:
a. The creeks will be divided into reaches based upon
continuity of cross section and vegetation. The channel
reaches are designated in the Corps of Engineers'
Operations and Maintenance (0 & M) Manual.
b. Representative cross sections will be established within
each reach for annual survey to define the level of
sediment deposition and for visual comparison with
standard reference drawings which define composite
roughness for a realistic range of vegetation density
and projection into the channel. The reference drawings
are included in the 0 & M Manual.
C. The depth of sediment deposition and composite roughness
at each representative cross section will be analyzed to
assure conformance with the performance standard by
using curves which correlate percent reduction of
freeboard with depth of sediment and composite
roughness. The correlation curves are included in the 0
& M Manual.
d. Wien analysis indicates that a 100 year recurrence storm
water on-fam will exceed the design water surface plus
50 percent of the freeboard depth, channel maintenance
will be required.
4
e. The appropriate form of maintenance within a reach,
either silt removal or vegetation management, will be
determined by the Flood Control District with the
concur of the agencies having regulatory or
cxantract authority over the channel reach.
f. M ere channel maintenance is indicated, sufficient
"J i mer rt removal ardor vegetation management will be
performed to bring the channel reach to a condition of
zero freeboard reduction.
6. It is the intention of the District to maintain the channels
in an environmentally sensitive manner. The flood plain
areas north of both the low flow channel and the associated
10 foot riparian corridor will be maintained by mowing
vegetation and/or removing sediment as indicated by the
annual field review.
A hierarchy of increasingly intense mainte� procedures
will be applied to correct problems of obstruction, erosion,
and sediment deposition associated with the low flow
channels. Terms specific to these procedures are defined as
follows:
Frequent - recurring at less than 10 year intervals.
Infrequent - recurring at 10 year or greater intervals.
Short reach - less than a 200 foot length of channel.
IAng reach - a 200 foot or longer channel length.
Minor diversion - an offset of the low flow channel
centerline of 10 feet or less from the design
centerline; the low flow channel remains within the
riparian corridor.
Major diversion - an offset of the low flow channel
centerline of more than 10 feet from the design
centerline. The low flow channel extends outside of the
riparian corridor.
Except for emergency work, maintenance effort in the low flow
channel and 10 foot riparian corridor shall be the miniTa=
necessary as prescribed in the annual maintenance plan,
developed in consultation with the agencies having regulatory
and contractural authority over the project and in accordance
with the following procedures:
a. Stable low flow channel - prune and remove vegetation
from the low flow channel as necessary to clear flow
obs-txuc cns. Access through the` 10 foot riparian
5
corridor will be limited to 15 foot wide openings spaced
at a minirmlm of 100 foot intervals.
b. Infrequent sediment mon over a short reach-
remove sediment by machine. Access through the 10 foot
riparian corridor may be made at frequent intervals,
however, enphasis will be placed on saving tree canopy.
Cuttings will be planted to replace any removed trees;
understory vegetation will be reestablished naturally.
C. Frequent minor diversion - allow channel to stabilize;
no regarding. Remove 10 foot riparian corridor
vegetation which obstructs flow. Allow former channel
area to revegetate naturally.
d. Infrequent minor/major diversion - regrade channel to
the design condition. Replace disturbed or removed
trees with cuttings, understory vegetation will be
reestablished naturally.
e. Infrequent sediment obstruction over a long reach-
remove sediment and north bank riparian corridor by
machine to reestablish design conditions. Reestablish
10 foot riparian corridor trees by planting cuttings;
understory vegetation will be reestablished naturally.
f. Frequent major diversion - Relocation of the meandering
low flow channel reach will be performed when determined
necessary as a result of the annual field review to
assure the design level of flood protection and to
minimize maintenance effort. Along the major diversion
reach the 10 foot north bank riparian corridor will be
removed and an equivalent vegetation area will be
provided by planting cuttings within the former (design)
low flow channel area. Maintain low flow channel as
part of the adjacent flood plain area.
g. Frequent sediment obstruction over a short/long reach-
regrade channel at a 10 foot right (north) offset frcm
the design law flaw channel centerline. Replace the 10
foot north bank riparian corridor by planting cuttings
within the former channel area to provide equivalent
vegetation area. Maintain low flow channel as part of
the adjacent flood plain area.
h. Frequent sediment removal from the low flow channel
required by the California Department of Fish and Game
to promote fish passage - regrade channel at a 10 foot
right (north) offset from the design low flow channel
centerline. . Replace the 10 foot north bank riparian
corridor by planting cuttings within the former channel
6
area to provide equivalent vegetation area. Maintain
low flow channel as part of the adjacent flood plain
area.
7. &exgency conditions may require selective vegetation
removal. In such circumstances, . the District will attempt
to minimize the impacts on creek vegetation. Removed trees
will be replaced with cuttings.
II. gUggific Section
A. Wildcat Creek from Castro Slough upstream to the berm (station 10
+ 00 to22 + 50) .
San Pablo Creek from bay to edge of sanitary landfill site
(station 10 + 00 to 31 + 50) .
The District has no maintenance responsibility and will perform no
maintenance within these reaches. These channels are expected to
stabilize at depths and cross sections that will not require any
future dredging.
B. Wildcat Creek from start of berm upstream to the transition zone
(station 22 +50 to 37 + 501.
The District will maintain the berm to provide the designed
containment. Reestablishment of the berm (training levee) will be
performed by placing suitable material obtained from, an upland
area or dredged from the adjacent creek area by appropriate,
efficient means least destructive to the habitat. No dredging is
required of the District in this reach. The sole maintenance
activity shall be the reestablishment of the berm. If the berm
needs to be reestablished, it is expected that it will revegetate
naturally. The District will not be responsible for revegetation.
C. Wildcat Creek from start of transition zone upstream to North
Richmond Bypass Bridcte (station 37 + 50 to 58 + 62) .
Channel maintenance will be performed in accordance with the
annual maintenance plan. Volunteer vegetation will be allowed to
grow within a 10 foot wide corridor north of the low flow channel
between Sta. 45+00 and Sta. 52+00. This vegetation may be removed
to facilitate low flow channel maintenance. South bank vegetation
will not be disturbed.
The District will control the vegetation on the berm containing
the service road to the extent necessary to meet Corps of
Engineers and District inspection requirements. We do not
anticipate extensive vegetation removal in this area. The
District will not remove any vegetation to facilitate recreation
activities.
7
D. San Pablo Creek from edge of sanitary landfill to the new landfill
bridge (station 31 +50 to 43 +20) .
awu-Ael maintenance will be performed in accordance with the
annual maintenance plan. The District will not trim or remove any
live vegetation on the south and west bank of the creek. There is
no 10 foot wide north bank riparian corridor in this reach.
E. Wildcat Creek from North Richmond Bypass upstream to Verde School
(station 58 + 62 to 90 + 00) .
San Pablo Creek from sanitary landfill bridge upstream to Third
Street (station 43 + 20 to 78 + 60) .
Channel maintenance will be performed in accordance with the
annual maintenance plan. The District will not remove vegetation
fia, the south bank area except when necessary for access to
repair a bank failure, restore project freeboard or other
emergency incident. The extent of removal will be minimized but
it shall be sufficient to provide for an efficient repair process.
Further, the most direct access will be utilized where possible
which might include a direct crossing of the creek in lieu of a
longitudinal access. Removed trees will be replaced by planting
cuttings.
Within 50 feet of each bridge the vegetation shall be removed to
maintain the hydraulic capacity of the road crossing.
F. Wildcat Creek at Verde School (station 90 + 00 to 96 + 00) .
The District shall maintain this reach of creek as a typical rock-
..lined trapezoidal shaped channel in accordance with the annual
maintenance plan. Above the 10-year recurrence storm water
level, only non-woody plants will be allowed to grow on the sides
of the rock and gabion lining. Vegetation on the south bank above
the rock lining will be maintained to the extent necessary to
protect the rock lining and to remove dead vegetation which poses
a hazard to adjacent property. Vegetation in the service road
area (18 feet wide) on the north side of the channel will be
controlled to the extent necessary to prevent any restriction on
maintenance activities.
G. Wildcat Creek fran Venae School to SPRR Tracks (station 96 + 00 to
100 + 60) .
The District may remove sediment annually from the sediment trap
located in this reach. The vegetation on the south bank and on
the uppermost 6 vertical feet of the north bank shall be left
undisturbed except in the area of the access raarps.
8
H. Wildcat Creek fran SM to ATOF (station 100 + 60 to 108 +00)_.
This section shall be maintained as a rock-lined trapezoidal
channel in accordance with the armual maintenance plan.
I. San Pablo Creek from Third Street upstream to the SPRR Tracks
(station 78 + 60 to 101 + 60) .
Ommel maintenance will be performed in accordance with the
annual maintenance plan. The District will not remove vegetation
from the south bank area except when necessary for access to
repair a bank failure or ether emergency incident. The extent of
removal will be minimized but it shall be sufficient to provide
for an efficient repair process. Further, the most direct access
will be utilized where possible which might include a direct
crossing of the creek in lieu of a longitudinal access.
The District will allow the south bank vegetation canopy to
overhang the low flow dharml; growth in and north of the low flow
channel invert will be remaved.
GC:bb:pg
wantce3
March 16, 1989
9
MAINTENANCE PIAN
. Fr.R THE
Wn= AND SAN PABLa Cl2= RFACH F PRO=
APPENDIX A
Advance notice of the arTival spring field review will be sent to the
following agencies and organizations:
Regional Manager, Region III
Calif. Dept. of Fish & Game
P.O. Box 47
Ybuntville, CA 94599
Chairperson
CC Shoreline Committee
237 Bishop Avenue
Richmond, CA 94801
City Manager
City of Richmond
Civic Center and MacDonald
Richmond, CA 94801
City Manager
City of San Pablo
#1 Alvarado Square
San Pablo, Ca 94806
General Manager
East Bay Regional Park
11500 Skyline Boulevard
Oakland, CA 94619
Cthair perscn
Richmond Neighborhood Comm.
258 Sixth Street
Richmond, CA 94801
Superintendent
Richmond Unified School District
3.108 Bissell Avenue
Richmond, CA 94804
Executive Officer
S.F. Bay Conserv. & Dev. C=u-
30 Van Ness Avenue
San Francisco CA 94102
Director
Save San Francisco Bay Assoc.
2500 Iawell Avenue
Richmond, CA 94804
t
maxmtive Officer
State Coastal Conservancy
1330 Rmadway, Suite 1100C
Oakland, CA 94612
Executive Officer
State Lands Ccmm ssion
1807 13th Street
Sacramento, CA 95814
U.S. Fish & Wildlife Service
Chief, Div. of Ecological Services
2800 Cottage Way, Ian. E-1803
Sacramento, CA 95825-1846
U.S. Fish & Wildlife Services
Chief, Endangered Species Office
2800 Cottage Way, Rn E 1823
Sacramento, CA 95825-1846
Director
Urban Creeks Council
2335 Roosevelt Ave.
i.-.•rkeley, CA 94703
Chief
West County Fire Protection Dist.
401 27th Street
Richmond, CA 94804
Notice regarding agency or organization change of ams must be in writing
and clearly marked: "Change of Address for Notification of Annual
Maintenance Field Review, Wildcat and San Pablo Creeks Reach I Project" and
must be mailed to:
Chief Engineer
Contra Costa County Flood Control
and Water Conservation District
255 Glacier Drive
Martinez, CA 94553
GC:bb
app.wc
2/2/89
2
APPENDIX g
WILDCAT : Gnd SAN PABLO CREEKS
REACH I CROSS SECTIONS
VEGETATION KEY
SALT TOLERANT VEGETATION
UNDERSTORY VEGETATION
REPLANTED TREES and
UNDERSTORY VEGETATION
EXCEPT WHEN NOTED
AS EXISTING.
'\r 1
POSSIBLE LOCATION OF
ENHANCEMENT OR RECREATIONAL
rLANDSCAPING.
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