HomeMy WebLinkAboutMINUTES - 02281995 - 1.21 •--�- /x.,71
TO: BOARD OF SUPERVISORS p�
FROM: J. MICHAEL WALFORD, PUBLIC WORKS DIRECTOR
DATE: February 28, 1995
SUBJECT: Approve San Ramon Creek Property Structure Rehabilitation Project, Danville area.
Project No.: 7520-669322-94, CDD-CP #95-1
SPECIFIC;REQUEST(S)OR RECOMMENDATION(S)&BACKGROUND AND JUSTIFICATION
I. Recommended Action:
APPROVE Project, and
DETERMINE that the project is a California Environmental Quality Act Class 1C Categorical
Exception, and DIRECT the Chief Engineer to prepare contract plans and specifications for
construction.
DIRECT the Director of Community Development to file a Notice of Exemption with the County
Clerk.
DIRECT the Chief Engineer to arrange for payment of the $25.00 handling fee to the County
Clerk for filing of the Notice of Exemption.
II. Financial Impact:
r
The estimated project cost is $330,000, funded by Flood Zone 3B (100%).
III. Reasons for Recommendations and Background:
The project includes the reconstruction of portions of Drop Structure No. 4 and the repair of failed
subdrainage systems at Drops 7, 8, 9, and 11 on San Ramon Creek.
Continued on Attachment: X SIGNATURE:
_RECOMMENDATION OF COUNTY ADMINISTRATOR
_RECOMMENDATION OF BOARD COMMITTEE
APPROVE OTHER
SIGNATURE(S):
ACTION OF BOARD O 29)11W APPROVED AS RECOMMENDED ✓OTHER_
VOTeOF SUPERVISORS
✓✓ UNANIMOUS (ABSENT )
AYES: NOES:
ABSENT: ABSTAIN:
BF:kd
g\Design\BO\BO28b:t2 I hereby certify that this is a true and cortex COPY Of"
an aciion-taken and entered On-the inftww-0t tli0
Contact: Bill Fernandez, 313-2294 eoard suaerrisors on the`sate shown. -
( ) � -119-9.5--
Orig.
19 Q5
Ori Div: Public Works (Design Division r � '
9� ( g ) .PHIL B/1TGHELOR,CIWk of the eoara
cc: County Administrator agora and county Administrator -
Attn: E. Kuevor
Auditor-Controller Deputy
PW Accounting -- - --
San Ramon Creek Property Structure Rehabilitation Project
February 28, 1995
Page Two
The recent collapse of Drop Structure No. 5 was attributed to a failed subdrainage system
therefore, this project is needed to insure the long term function of these vital grade control
structures along San Ramon Creek.
IV. Consequences of Negative Action:
Delay in approving the project will result in a delay of design and construction may jeopardize
completing the project this construction year.
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�, PRO z �r`, .+ , .
tµ ,�5 JECT'NAME• Drop Structure Rehabilitatio '
- J ,- «,1)�v,J= t ; �' ' {;San Ramo II C#s 4, 7 9,`& 11)
4 J Y „{ f ., �} ,K, a rr, ".,�, nand Sycamore Creeks .
l.e j 1 7£d;; y .:{yr,AYnq �,) 1+�'Nq'.'iW_ („ ,r t 5 k ,y r -
soy r Il x _4 , ,
[ 4
12EPARE)5 BY. Janet Frattirt '/
y., Axl
yt t ,„ f r,...P: i; ', t t January 3, 1995
DATE• .
REVIEWED BY
1 DATE: e
J r
' REC4MII�II?NDATIONS I ., ,t
"a7 Y3 yJ m 1
t> >St f Ja 5 5 C rf i i f{,� d .+ h r
1 + r. i 5 h44 F .. _r-. a
�Yr (x),1.Cate oncal t
f g Exemption Class 1c
't t, (`) Environment m a ) t ( ) Negattve Declaration
p ct Report Regwred ( ) Conditional Ne
r, } , r, aration
5 r 1 {�Vy}h Jp,h4'Ittft�4 yu {'9 *��'4r .x+1� t r��{ 3 t a 3 3, ,r d v H n 1 ,; tivQi D�iCiI
r �4t t'^.:'4-Cr��i^Y'��"y*t, �K M ' -1,llvzi$E t�'xy5 +' f�<t ttJ Vii, �J Y 5,ja r.,,'�"" ,
'`tt ' 'i i.lt'i rtl c �'� dJ+pYo dr 'S...-r.;;r'r'fit f :i A+'t:t",40�.,, , �cfy k,� F..•
Ivk w J l not have a siI 11
,x b„ , 5 y t gnifiCAllt effect on the e
oll1. m�ronnient, mmen
E r. " s aced on the f orovm 1 ?�4 ;� r{ Aix Z'he taco dation is
7' .j Fi XAt*," �'n '��* .S}i�r,tft,2a,,rAv V, r� 4'r6 3x j "kit d r , Y i{, ,
.
,, "u.3, a protect consists of the rehabilitation of existin structures
^,f �:x �;'?boyond thatt previously e�nsting. No scenic resources llbe removed asr�sion of use
e3rj�', project. ;xk i at s f rv.p j[ a'7,}i , t ,Y
tf J F r , `, suit of the
:z, tit s. t
1.
a r aJ y , d r rr: -
What changes to the prolectrwould `mitigate the identified
11
for any sigcant unpat:ts and conditional ne1. impacts (fit mitigation measures
N/A ,} 1. 1 �e declaration),
�' r
r; ! , t .r r i t t +�
i ,� ,' �,US , Quad Sheet Las Trampas/DiabIo Base Ma `�Sh
f ' r V,,;4�4(5� tr.,,�,�'! , f.,' ° ^,. � w ,�, r= P eat# R15,S15 T16 U16 Parcel#
{ j !j� 1 f't4�, 1 k 4r1't ,`)g `5 �,.,j,yt r s r.{S e" sit � � � N/A
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k `" , ' Gds I:CONS DFRATIONS ,,'M t�, z' J
,?trAs��T 'fT �x.tc�ii� �lr It 5 ,�Yc '} 'h,, { s �"` � �'Inr ! ` 1"I -
Y< 9, y ,, < t: fyr fT r r t> d i t t� r 11 II
1�tra �- 4 +i•^1 �i�y' t W' d"t 1r Y=4 ,�
x 5, Ps ,iJ motion d 4 r r f 1° f 4
x° f r, • ' ` ' The drop'striicturesj�are lIliz ocated
• ' r � ` within the
� l yn } infivea
�,, �` . � 7 g� ar<d Dait�ille (Figures' & 2)�M,Z F ,tr,t , ;1 teas Towns of Alamo
itt }. ,t t4� ,y', �Sa.t� � t* d, `�` .r r' h t t' w � 7u f,. c a5 .r'r +ti i
t { f 6 J ,S h
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' 1 i/•y, , A4 � D6cj 1, Yon• y +N. f/i4 .: \ k ' t ,.: - ;.
, P The protect consists of rehabilitating five flood control drop
� ,;",r,.�r ;, structures within existing rights of way: Construction activities involve (a) Removal
+«� of ;backfill matenal;in order to replace the failed subdrain i e s stem
, � perforated lactic i'e. P P Y with
P P P This will restore fhe.drainage of ground water collecting
behind the structures.:(b) Holes.will be drilled in each existing concrete structure
release water`collected from the`pipe,s tem, thereby reducing the risk of structure to
P P , y
failures. f„(c);Low flow pipes will be removed'and.replaced. (d) Replace seven
f � detenoratin six foot hi
' ,{ '` g� , 1. gh energy dissipators. . They will be anchored to an existin
}{,`$ 5; �kii rcoricrete'.slab at drop structure- #4 '; e
Y OCofferdams, bypass pipes, and silt traps
' ;' '$nd%r filters ma be:installed
5 ��"'a;` Of the project. Once rehabilitation s oma le ares be removed upon completion
tY 0 r,��6F'{.v, t rt r
= w` " , _��`' :�material t1.o the on P , the area will be backfilled with native
�r ,<<, � r ,t mal plait configuration (Figure`3 Rock ri ra
�� � 3y ,�, arouzid the tt� of the p )' P� P may be added
„ ,5 , ; , �{ a ,, p dro structures to minimize erosion.
r �l,taF 1N, f fs tFpy C '(r, tt1+. fit` sit;.�''>"e'Yir r c , .
rt r5�{.r �ot a,{ �_ ,7.Pataii,M1,r r;: t�Yly v 044 f rr r;: .i .
1., "'. � !'k, ".t �y Wi� ,_ � f k't5 .y t
DOe$ It S ear that`
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�'�'J'S ` ; ��• PP any feature of the protect w enerate si
,�!! 'bf} t� J N/
z , . concern? yea° ( n /�/{{�(tp g gnificant public
' -t.3'.'N}' 7{ /4' S 4 4 / :n 3 4 i.O �, •Y1 V of WJ1ce -
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xj [ ] (Na rn):
4
s ,,
}= Will the pro�eet`i a 4
. , , r eQ pprovat or permits by other than a Coon agency?
r t ; t,1>, < [ � no Agency,Names) DFG 1601 A ee t3' Ixl Yes
r gi went and ACOE.
4, 4 ; .
5 t 'v Is the Pl anthin the Sphere of Influence of a>iy city? ame N
tY (N ) o.
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NOT TO SCALE c 1 '_s.•. _ .. � 9
ricin K L 3
Existing
Folded Crest Wier
Replace Replace failed subdrain
energy dissipators FLOW
at Drop Structure#4 amb i
Backfill to be replaced to
original plan configuration
PLAN VIEW
Existing
Wier Crest
Existing low Sow Pipes
to be removed and replaced
Existing
Soil seat for sub drain
Existing sWWrain and g:avei
filter to be removed•and replaced
PROFILE
PURPOSE. TYPICAL REHABILITATION
Rehabirrtaiion Drop Structures#4, 7-9, 8t it
of Four Drop Structures
Along San Ramon Creek CONTRA COSTA COUNTY
One Drop Stye Creek a Along PUBLIC WORKS DEPARTMENT
Sycamore 255 GLACIER DRIVE
January 1995 MARTINE4 CA 94553
CONTRA COSTA COUNTY
COMMUNITY DEVELOPMENT DEPARTMENT
DATE: / / -S
TO: Development Engineer/Architect
FROM: James W. Cutler, Chief of Comprehensive Planning Vu/
By: Matt Tomas, Senior Planner
SUBJECT: MANDATORY REFERRAL FOR GENERAL PLAN CONFORMANCE
Community Development staff has reviewed the attached project, CP _ to determine
if mandatory referral for General Plan Conformance, as required by Section 65402 of the
Government Code, is necessary.
The project needs no further mandatory referral clearance from County staff subject to the
following
/actions:
C� This project has been determined to be exempt from 65402 review.
( ) This project has been determined to be exempt from 65402 review in
accordance with the Board of Supervisors Resolution 81/522 because the
project involves a road alignment project of a minor nature.
( ) This project should be referred to the City of for 65402 review.
{ ) Community Development staff makes the following attached recommendation
which should be incorporated into the staff report on this matter.
The project needs mandatory referral and County staff will process this project in the
following manner:
( ) 65402 review is required. Community Development staff will carry this matter
before the appropriate Planning Commission.
{ ) 65402 review must be withheld until completion of an Environmental Impact
Report on this project.
( ) Other procedures.
JWC/MT:gms
cxhIUNR4gpc
Contra Community ConHarvey E. Bragdon
t J l Director of Community Development
Development Costa
Department County
County Administration Building
651 Pine Street
4th Floor, North Wing ,.�.-5E.• -_of
Martinez, California 945530095
Phone: 6415-4202 � '-�� j� January 11, 1995
.Si-CU U'y'C'i
County File #CP 95-1
Attention: Public Works Department
Janet Frattini - Design Division
Dear Applicant:
The Contra Costa County Community Development Department has completed an initial study of the environmental
significance of the project represented by your pending application bearing County File Number CP 95-1 (Drop
Structures Rehabilitation V's 4,7-9&11). In conformance with Contra Costa County Guidelines for implementing
the California Environmental Quality Act of 1970(CEQA), it has been determined that your project will not have
a significant effect on the environment. Your project falls within the following category:
GO AN ENVIRONMENTAL IMPACT REPORT (EIR) IS NOT REQUIRED.
(✓) The project is categorically exempt (Class 1 c ).
( ) The CEQA requirements are accommodated by the EIR previously prepared for
( ) A statement that an EIR is not required (Negative Declaration of Environmental Significance has
been filed by the Community Development Department (unless appealed).
( ) Other: General Rule of Applicability (Section 15061(b)(3))
( 11 AN ENVIRONMENTAL IMPACT REPORT (EIR) IS REQUIRED.
() The complexity of your project requires your submission of additional special reports or
information (as outlined on the attached sheet) (which will be outlined in a forthcoming letter).
( ) A consultant will be hired to prepare the environmental impact report. This procedure is
explained on the attached sheet.
Preparation of the EIR cannot be started until the fee and additional information requested is
received by the Community Development Department.
If you have questions concerning this determination or desire additional information relative to environmental
impact report regulations, please call (510) 646-2031 and ask for Debbie Chamberlain.
Sincerely yours
Harvey E. Bragdon
Director f Community Development
By:
.Qms
CALIFORNIA ENVIRONMENTAL QUALITY ACT
Notice of Exemption
Contra Costa County Community Development Department
.651 Pine Street, 4th Floor - North Wing, McBrien Administration Building
Martinez, CA 94553-0095
Telephone: (510) 313-2296 Contact Person: Vickie Germany - Public Works Dept.
Project Description, Common Name (if any) and Location: DROP STRUCTURE REHABILITATION(#'s 4, 7-9
AND 111 - SAN RAMON AND SYCAMORE CREEKS County File #CP 95-1: The project consists
rehabilitating five flood control drop structures within existing rights-of-way. Construction activities involve:
(a) removal of backfill material in order to replace the failed subdrain pipe system with perforated plastic
pipe. This will restore the drainage of ground water collecting behind the structures; (b) holes will be drilled
in each existing concrete structure to release water collected from the pipe system, thereby reducing the
risk of structure failures; (c) low flow pipes will be removed and replaced; (d) replace seven deteriorating,
six-foot high energy dissipators. They will be anchored to an existing concrete slab at drop structure #4;
and (f) cofferdams, bypass pipes, and silt traps and/or filters may be installed. These structures will be
removed upon completion of the project. Once rehabilitation is complete, the area will be backfilled with
native material to the original plan configuration. Rock rip-rap may be added around the top of the drop
structures to minimize erosion. Subject project is located as follows: The drop structures are located in five
areas within Alamo and the Town of Danville.
This project is exempt from CEOA as a:
Ministerial Project (Sec. 15268) Other Statutory Exemption, Section _
_ Declared Emergency (Sec. 15269(a)) _ General Rule of Applicability(Section 15061(b)(3))
Emergency Project (Sec. 15269(b) or (c))
r/ Categorical Exemption, Class 1c Section 15301
for the following reason(s): The project will not have a significant effect on the environment.
The project consists of the rehabilitation of existing structures involving no expansion of use beyond that
previously existing. No scenic resources will be removed as a result of the project.
Date: _ By:
Community Development Department Representative
AFFIDAVIT OF FILING AND POSTING
1 declare that on I received and posted this notice as required by California Public
Resources Code Section 21152(c). Said notice will remain posted for 30 days from the filing date.
Signature Tide
Applicant:
County Public Works Department Department of Fish and Game Fee - Exempt
255 Glacier Drive
Martinez, CA 94553 County Clerk Fee'$25 Due Receipt #
Attn: Janet Frattini