Marina Lagoon Spot Dredging Project

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Exp. 09-30-25
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CO. PINOLE HERCULES MARTINEZ
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DC S AITL A YY P N A C F S IF R A C ICC A O N A N O L M M C A . S A IS A T N C E S F B O O O R R U A I C S T C N B H O C O A I . S N . C E O LOS S RA A EN N N Z L O EANDRO HAYWARD PLEASAN L T IV O E N RMORE
SAN BRUNO
LINDA MAR MILBRBAUERLINGAME UNION CITY
MONTARA MSAANTEO FOSTER CITY FREMONT
MOSS BEACH BELMONT NEWARK
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HALF MOON PR B AE A RD Y KWOO R D E W DW OO O D OA S DTM I H D C EE E I N TRL YTOO PNARK PA USTN L AI O VN.F A OR L D TO MILPITAS
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SJOASNE SANTA CLARA
PESCADERO SARATOGA CO.
SANTA CRUZ
CO. SCOTTS VALLEY LOCATION MAP VICINITY MAP
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LEGEND
GENERAL NOTES
VIEW LETTER VIEW LETTER
1. THE CONTRACTOR SHALL BE SOLELY RESPONSIBLE FOR INSTALLING AND MAINTAINING ALL
WARNING SIGNS AND DEVICES NECESSARY TO SAFEGUARD THE PUBLIC AND THE WORK, AND
X SAMPLE VIEW TITLE X
FOR PROVIDING PROPER AND SAFE ROUTING OF THE BOATING, VEHICULAR AND PEDESTRIAN
TRAFFIC DURING THE PERFORMANCE OF THE WORK. THIS REQUIREMENT SHALL APPLY ## SCALE: 1"=50' ##
CONTINUOUSLY AND SHALL NOT BE LIMITED TO WORKING HOURS. THE USE OF FLAGGERS, SHEET NUMBER VIEW
BARRICADES, AND CONSTRUCTION SIGNING SHALL COMPLY WITH THE CITY OF SAN MATEO'S REFERENCED TO 1
STANDARD SPECIFICATION; AND BUOYS, LIGHTS, OR OTHER NAVIGATIONAL AIDS SHALL SHEET NUMBER VIEW
COMPLY WITH THE U.S. COAST GUARD REQUIREMENT. REFERENCED FROM
2. THE CONTRACTOR SHALL BE RESPONSIBLE FOR DETERMINING THE EXACT LOCATION OF ALL VIEW TITLE DETAIL CALLOUT KEYED NOTE
UTILITY SERVICES WITHIN THE PROJECT LIMITS OF CONSTRUCTION. THE CONTRACTOR SHALL
BE RESPONSIBLE FOR ALL DAMAGE INCURRED TO UTILITIES TO THE SATISFACTION OF THE CITY. VIEW LETTER
3. PROJECT OWNER:
CONTACT: JAMES YANG, SENIOR ENGINEER X P#
DEPARTMENT OF PUBLIC WORKS, CITY OF SAN MATEO ## ##
650-522-7575, JYANG@CITYOFSANMATEO.ORG X
##
4. DESIGN ENGINEER: SHEET NUMBER VIEW
MOFFATT & NICHOL REFERENCED TO
2185 N. CALIFORNIA BLVD, SUITE 500
WALNUT CREEK, CA 94596 SECTION CALLOUT PHOTOGRAPH DETAIL CALLOUT WITH
CONTACT: JACLYN GNUSTI, P.E.
925-944-5411 CALLOUT LEADERS
5. CONTRACTOR SHALL PROVIDE THE ENGINEER WITH A DETAILED DREDGING AND DISPOSAL
OPERATIONS PLAN PRIOR TO COMMENCING WORK, SEE SPECIFICATIONS.
6. THE CONTRACT DOCUMENTS AND SPECIFICATIONS REPRESENT THE SCOPE OF WORK.
UNLESS OTHERWISE SHOWN THEY DO NOT INDICATE THE METHOD OF WORK. THE
CONTRACTOR SHALL SUPERVISE AND DIRECT THE WORK AND SHALL BE SOLELY
RESPONSIBLE FOR ALL MEANS AND METHODS, TECHNIQUES, SEQUENCES AND PROCEDURES.
JACLY N G N U STI
SHEET NUMBERS AND TITLES
1. TITLE SHEET 2. OVERALL PLAN 3. SEDIMENT REMOVAL AREAS - EXISTING CONDITIONS 4. NORTH LAUNCH REHANDLING SITE 5. DREDGE PLAN 1 OF 2 LESLIE CREEK DREDGE AREA 6. DREDGE PLAN 2 OF 2 BOREL CREEK DREDGE AREA
7. SECTIONS LESLIE CREEK DREDGE AREA 8. SECTIONS BOREL CREEK DREDGE AREA 9. CONSTRUCTION BMPs
TEEHS
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PROJECT LOCATI
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MATEO-HAYWARD
BRIDGE
SAN FRANCISCO BAY
BAIR ISLAND
101
280
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WATER LEVEL SUMMARY
MARINA LAGOON'S PRIMARY WATER SOURCE IS TIDAL FLOW THROUGH O'NEILL SLOUGH DURING
HIGH TIDES. IN ADDITION TO BEING TIDALLY INFLUENCED, THE WATER LEVELS ARE REGULATED
ON A SEASONAL BASIS, SEE TABLE 1 AND TABLE 2.
WATER LEVELS SHOWN ARE ONLY FOR REFERENCE AND MAY NOT REPRESENT CONDITIONS
DURING CONSTRUCTION.
TABLE 1:
NOAA STATION ID#9414523 REDWOOD CITY CA
DATUM VALUE DESCRIPTION
MHHW 7.02 MEAN HIGHER-HIGH WATER
MHW 6.39 MEAN HIGH WATER
MSL 3.22 MEAN SEA LEVEL
MLW 0.02 MEAN LOW WATER
NAVD88 0.00 NORTH AMERICAN VERTICAL DATUM OF 1988
MLLW -1.18 MEAN LOWER-LOW WATER
TABLE 2:
MARINA LAGOON OPERATING LEVELS
LEVEL OPERATING RANGE
PERIOD COMMENTS ADJUSTMENT (NAVD88, FT)
NOVEMBER 1 - PREPARING FOR
-1FT TO -1.5FT 0.5 TO 1.0
NOVEMBER 30 WINTER RAINS
DECEMBER 1 - WINTER OPERATING
-0.4FT TO -0.9FT 0.1 TO 0.6 APRIL 14 LEVEL
APRIL 15 - SPRING
+1.0FT TO +1.5FT 0.5 TO 1.0
APRIL 30 INTERMEDIATE LEVEL
ABBREVIATIONS MAY 1 - +1.0FT TO +1.5FT 1.5 TO 2.0 SUMMER OPERATING
OCTOBER 31 LEVEL
CT COURT NAVD88 NORTH AMERICAN VERTICAL
DR DRIVE DATUM OF 1988
ELEV ELEVATION ST STREET PROJECT DATUM AND SURVEY INFORMATION
(E) EXISTING TYP TYPICAL
FT FEET VERT VERTICAL COORDINATE SYSTEM: CALIFORNIA STATE PLANE ZONE 3, NAD83(2011) US SURVEY FEET
FWY FREEWAY VERTICAL DATUM: NORTH AMERICAN VERTICAL DATUM OF 1988 (NAVD88) US SURVEY FEET
HORZ HORIZONTAL MAX MAXIMUM ALL ELEVATIONS ARE REFERENCED TO NAVD88, FEET. MHW MEAN HIGH WATER MHHW MEAN HIGHER-HIGH WATER
MIN MINIMUM
MLW MEAN LOW WATER MLLW MEAN LOWER-LOWWATER
MSL MEAN SEA LEVEL
1

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C CONSTRUCTION ACCESS PLAN - NORTH LAUNCH REHANDLING SITE
2 SCALE: 1" = 50'
GENERAL NOTES:
1. THE CONTRACTOR SHALL KEEP ALL STREETS AND VEHICULAR TRAFFIC AREAS CLEAN.
2. THE CONTRACTOR IS RESPONSIBLE FOR ANY TRAFFIC AND PEDESTRIAN CONTROLS REQUIRED DURING THE DURATION OF
THE PROJECT.
3. THE CONTRACTOR SHALL INSTALL AND MAINTAIN PERIMETER FENCING AS REQUIRED TO MAINTAIN SECURITY OF SITE.
4. THE CONTRACTOR SHALL PROTECT-IN-PLACE ALL STRUCTURES, UTILITIES, AND OBJECTS WITHIN THE WORK SITE. ANY
DAMAGE TO THESE ITEMS CAUSED BY THE WORK SHALL BE REPAIRED BY THE CONTRACTOR AT THEIR EXPENSE.
5. OPERATION, TRANSIT, OR STAGING OF CONSTRUCTION EQUIPMENT AND PLACEMENT OF STOCKPILE OF MATERIAL SHALL BE
CONDUCTED WITHIN THE PORTIONS OF THE LAGOON NECESSARY FOR DREDGING, TRANSPORT, AND OFFLOADING
OPERATIONS AND UPLAND WITHIN THE PERIMETER FENCING.
6. IF ADDITIONAL STAGING AREA SPACE IS REQUIRED IT IS THE CONTRACTORS RESPONSIBILITY TO ACQUIRE NECESSARY
EASEMENTS AND AGREEMENTS AND COORDINATE USAGE AND ACCESS OF SUCH PLACES.
7. CONTRACTOR TO ESTABLISH PEDESTRIAN DETOUR ROUTE. ROUTE TO BE COORDINATED WITH THE CITY.
8. EXISTING PARKING LOT IS DECOMPOSED GRANITE SURFACE.
9. CONTRACTOR TO PROVIDE PEDESTRIAN ACCESS TO THE EXISTING MAIN PEDESTRIAN PATH OUTSIDE OF WORK HOURS.
10. THE CONTRACTOR IS ALLOWED TO REMOVE BOLLARDS AT THE ACCESS ROAD, BUT SHALL REPLACE THEM IN-KIND.
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J HART CLINTON DR
MARINA LAGOON
P2
X X X X 4
(E) MAIN PEDESTRIAN
X PATH (SEE NOTE 9)
X ( ( S E E ) P E A N R O K T IN E G 8 ) LOT (E ( ) D L O IG N H O T T P D O IS LE T , U T R Y B P ) O A D L (E A ) U B N O C A H T RAMP
R
TEMPORARY PEDESTRIAN X P1 (E) ( P O U V B E L R IC H E U A T D IL I P T O Y W E E A R SE L M IN E E N S T ) H O R
PATH DETOUR, SEE NOTE 7 4 N C P1 VIEW OF BOAT LAUNCH RAMP
X A 4 LOOKING SOUTHEAST
(E) BOAT 1
X LAUNCH RAMP
(E) PUBLIC UTILITY
EASEMENT (OVERHEAD (E) PEDESTRIAN PATH
X POWER LINES)
X
(E) LIGHT POLE
APPROXIMATE BOUNDARY OF (E) BOAT (PROTECT IN
EXISTING UTILITIES NORTH LAUNCH REHANDLING SITE LAUNCH PLACE), TYP
(DO NOT DISTURB) RAMP
MARINA LAGOON
(E) SINGLE LANE
ACCESS ROAD TO
REHANDLING SITE
(E) BOLLARDS, TYP
SEE NOTE 10.
P2 VIEW OF ACCESS ROAD
4 LOOKING WEST
LEGEND:
APPROXIMATE TRUCK ROUTE
X APPROXIMATE BOUNDARY OF NORTH
LAUNCH RAMP REHANDLING SITE
(PERIMETER FENCING)
(E) MAIN PEDESTRIAN PATH
TEMPORARY PEDESTRIAN PATH DETOUR
50' 0' 50' 100' 1 SCALE: 1''=50'

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NOTES:
1. PROVIDED BY THE CITY.
2. PROVIDED FOR THE CONTRACTORS
INFORMATION & REFERENCE.
3. THE A/E MAKES NO GUARANTEE OR
WARRANTY OF THE ACCURACY OR
COMPLETENESS OF THIS SHEET.

DDooccuussiiggnn EEnnvveellooppee IIDD:: 755EB872077A6259--EDAED45D--44145172--B813CEF8--AA3415BB3349FAE0FB565D33
State of California - Natural Resources Agency GAVIN NEWSOM, Governor
DEPARTMENT OF FISH AND WILDLIFE CHARLTON H. BONHAM, Director
Bay Delta Region
2825 Cordelia Road, Suite 100
Fairfield, CA 94534
R3lsa@wildlife.ca.gov
www.wildlife.ca.gov
June 12, 2025
Katherine Sheehan
City of San Mateo Public Works Department
330 West 20th Avenue
San Mateo, CA 94403
(650) 522-7300
ksheehan@cityofsanmateo.org
AMENDMENT OF LAKE OR STREAMBED ALTERATION AGREEMENT
NOTIFICATION NO. 1600-2013-0268-R3, Marina Lagoon General Maintenance Project
Dear Matt Fabry:
The California Department of Fish and Wildlife (CDFW) has received your request to
amend the above referenced Lake or Streambed Alteration Agreement (Agreement)
and the required fee in the amount of $1,882.25, for a major amendment. Your request
to amend the Agreement includes:
Modifying the project's maximum sediment removal from 750 cubic yards of
sediment per outfall to a cumulative maximum of 2,000 cubic yards of sediment
removal across all previously identified maintenance sites;
Redefining the type(s) of dredging equipment to be used to include an excavator
with standard or long-reach arm stationed from a float or similar, in addition to an
Aquamog;
Adding an additional sediment dewatering site to the project, at the northern
portion of Joinville Park adjacent to the boat ramp at Latitude 37.569838,
Longitude -122.290927; and
Removing Measure 2.5, Seasonal Work Period for Activities near Joinville Park.
The project will adhere to the seasonal work period specified in Measure 2.1 for
all dredging activities.
CDFW hereby agrees to amend the Agreement with addition of the following conditions:
2.30 Limits on Sediment Removal in the Lagoon. Sediment removal shall be limited to
the amounts and timing specified in the Project Description. Specifically, sediment
removal shall be limited to a cumulative maximum of 2,000 cubic yards in each
year.
All other conditions in the Agreement remain in effect unless otherwise noted herein.
Conserving California's Wildlife Since 1870

DDooccuussiiggnn EEnnvveellooppee IIDD:: 755EB872077A6259--EDAED45D--44145172--B813CEF8--AA3415BB3349FAE0FB565D33
Matt Fabry
1600-2013-0268-R3
June 12, 2025
The Agreement and this amendment letter must be readily available at project work
sites and must be presented when requested by a CDFW representative or agency with
inspection authority.
If you have any questions regarding this letter, please contact Shannon Husband,
Environmental Scientst at (707) 337-1364 or by email at
Shannon.Husband@wildlife.ca.gov.
Sincerely,
Craig Weightman, Environmental Program Manager
ec: California Department of Fish and Wildlife
Wesley Stokes, Senior Environmental Scientist (Supervisor)
Wesley.Stokes@wildlife.ca.gov
ACKNOWLEDGEMENT
I hereby agree to the above-referenced amendment.
Katherine Sheehan for Matt Fabry, Director of P6u/b1l2i/c2 0W2o5rks
Print Name: _______________________________ Date: ____________________
Signature: ________________________________
Rev. 06/26/2023 Page 2 of 2

Jessica Vargas May 28, 2025
Department of the Army
San Francisco District, Corps of Engineers
450 Golden Gate Avenue, 4th Floor, Suite 0134
San Francisco, CA 94102
Jessica Vargas:
On behalf of Jaclyn Gnusti of Moffatt & Nichol and James Yang of the City of San Mateo
Department of Public Works, please find our report "Characterization of the Sediment from the
Marina Lagoon in San Mateo, CA: Results of Sediment Sampling and Analysis" for review at
the May 28th DMMO meeting. An electronic copy of this report has been uploaded to the
DMMO website for DMMO participating agency representatives to access.
If you have any questions, please give me a call at (707) 207-7778. I look forward to hearing
from you.
Sincerely,
Mike McElroy
Sr. Project Manager
(w/ enc): Brenda Goeden, BCDC
Selina Louie, SFRWQCB
Jennifer Siu, U.S. EPA
Marlene Schroeder, CSLC
Arn Aarreberg, CDFW
Sara Azat, NMFS
Jaclyn Gnusti, Moffatt & Nichol
James Yang, City of San Mateo

DATA REPORT
Characterization of the Sediment from the Marina Lagoon
in San Mateo, CA: Results of Sediment Sampling and
Analysis
Permits
USACE Permit # 2000-257530S
BCDC Permit # M2004.030.00 Amendment No. 1
RWQCB CIWQS Place ID # 445464
CDFW SAA:1600-2013-0268-R3
Prepared for
City of San Mateo, Public Works Department
330 W. 20th Avenue
San Mateo, CA 94403
Prepared by
Pacific EcoRisk
2250 Cordelia Road
Fairfield, CA 94534
May 2025

Pacific EcoRisk Environmental Consulting and Testing
Table of Contents
Page
1. INTRODUCTION ...................................................................................................................... 1
1.1 Project Overview .................................................................................................................. 1
1.2 Objectives of the Sediment Investigation ............................................................................. 2
1.3 Organization of this Document ............................................................................................ 2
2. FIELD SEDIMENT SAMPLE COLLECTION ......................................................................... 6
3. SAMPLE PROCESSING ......................................................................................................... 11
3.1 Homogenization and Compositing of Sediments ............................................................... 11
3.2 Shipping of Sediment Samples to the Analytical Laboratories .......................................... 11
3.2.1 Chain-of-Custody (COC) Protocol .............................................................................. 11
4. RESULTS OF PHYSICAL/CHEMICAL ANALYSES ........................................................... 13
4.1 ML-2025-DU1 Analytical Chemistry Results ................................................................... 13
5. QUALITY CONTROL REVIEW ............................................................................................ 19
5.1 Sediment Conventional and Chemical Analytical QA/QC Summary ................................ 19
6. SUMMARY .............................................................................................................................. 21
7. REFERENCES ......................................................................................................................... 22
i

Pacific EcoRisk Environmental Consulting and Testing
Appendices
Appendix A Sampling Field Logs and Data Sheets
Appendix B Eurofins Data Report for the Sediment Analyses
List of Figures
Page
Figure 1-1. Location Map: San Mateo Marina Lagoon .................................................................. 3
Figure 1-2. Vicinity Map: San Mateo Marina Lagoon ................................................................... 4
Figure 1-3. Project Map: San Mateo Marina Lagoon - North Dredge Boundary .......................... 5
Figure 1-3. Project Overview: San Mateo Marina Lagoon ............................................................. 6
Figure 2-1. Site Map: Proposed and Actual Sample Locations - San Mateo Marina Lagoon ....... 8
Figure 2-2. Proposed and Actual Sample Locations: San Mateo Marina Lagoon - North
Dredge Boundary .......................................................................................................... 9
Figure 2-3. Proposed and Actual Sample Locations: San Mateo Marina Lagoon - South
Dredge Boundary ........................................................................................................ 10
List of Tables
Page
Table 1-1. City of San Mateo Marina Lagoon Dredging Volumes ................................................ 2
Table 2-1. Locations of Sampling Stations and Core Depths Achieved ......................................... 7
Table 4-1. San Mateo Lagoon 2025 Sediment Sample Chemistries ............................................ 14
ii

Pacific EcoRisk Environmental Consulting and Testing
List of Acronyms
Bay San Francisco Bay
BCDC Bay Conservation and Development Commission
CDFW California Department of Fish and Wildlife
City City of San Mateo
COC Chain-of-custody
DDT Dichlorodiphenyltrichloroethane
DMMO Dredged Material Management Office
Eurofins Eurofins Calscience
GPS Global positioning system
HDPE High density polyethylene
IDA Isotope Diltution Analyte
ITM Inland Testing Manual
Lagoon Marina Lagoon
LCS Laboratory Control Sample
g/kg Microgram per kilogram
mg/kg Milligram per kilogram
MLLW Mean lower low water
MDL Method detection limit
MS Matrix Spike
MSD Matrix Spike Duplicate
NAVD88 North American Vertical Datum 1988
OCI Organochlorine
PAH Polycyclic aromatic hydrocarbons
PCB Polychlorinated biphenyls
PER Pacific EcoRisk, Inc.
QA/QC Quality assurance/quality control
RRF Relative response factor
SAP Sampling and Analysis Plan
SFEI San Francisco Estuary Institute
SFRWQCB San Francisco Regional Water Quality Control Board
TEG TEG Oceanographic Services
TMDL Total maximum daily load
TOC Total organic carbon
USACE U.S. Army Corps of Engineers
iii