APPENDIX B4-2025 Proposed Dredge Prism - 27853423.pdf

PDF 1 MB Posted Oct 27, 2025

Attached to: Maintenance Dredging Coast Guard Station Cape Disappointment – Ilwaco - WA - FY 2026
Solicitation number: 70Z08826R0000384
Issued by: Department of Homeland Security US Coast Guard

About this file

Written by GovTribe AI · Oct 27, 2025

These are technical engineering drawings prepared by the U.S. Coast Guard Civil Engineering Unit in Oakland, California, depicting a dredging project for the Clay Street Site. The documents detail a proposed maintenance dredging area with precise geospatial coordinates and cross-sectional views, showing dredging parameters including a primary dredge prism at -10 Mean Lower Low Water (MLLW) and an overdredge zone at -12 MLLW. The drawings include detailed topographical information, existing and proposed contour lines, eelgrass spatial distribution, riprap shoreline protection, and specific instructions to preserve existing shoreline infrastructure. Key notes emphasize not removing or disturbing riprap, shoreline protection, haul out pier piles, and strictly adhering to the permitted maintenance dredging boundary. The site is located near the Columbia River, with multiple cross-sectional views (A-A' through F-F') illustrating the proposed dredging scope and existing grade elevations.

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Other files

File	Type	Posted
ABSTRACT OF OFFERS-Form 1419-29848529-26B0000384-DREDGE CAPE D.pdf	PDF	Dec 4, 2025
Amendment 0002 - IFB 70Z08826B0000384 DREDGING AT USCG CAPE D.pdf	PDF	Nov 21, 2025
APPENDIX B5-Final Cape Disappointment WQMPP_18April2021.pdf	PDF	Oct 29, 2025
Amendment 0001 - IFB 70Z08826B0000384 DREDGING AT USCG CAPE D.pdf	PDF	Oct 29, 2025
IFB_70Z08826B0000384_MAINTENANCE DREDGING AT USCG STATION CAPE DISAPPOINTMENT.pdf	PDF	Oct 27, 2025
APPENDIX B3-Pre-Dredge Eelgrass Survey - 24-103-01.pdf	PDF	Oct 27, 2025
APPENDIX B1-PERMITS - NWS-2021-246.pdf	PDF	Oct 27, 2025
APPENDIX D-WAGE DETERMINATION-WA20250080-08AUG25.pdf	PDF	Oct 27, 2025
APPENDIX G-CERT OF AUTHORIZATION TO BIND CORPORATION FAR 4.pdf	PDF	Oct 27, 2025
APPENDIX F-Clarification Request Form.docx	DOCX document	Oct 27, 2025
APPENDIX B2-Eelgrass Mitigation Plan - 20-021-01.pdf	PDF	Oct 27, 2025
APPENDIX A-SF1442-STACAPED DREDGE_B0000384.pdf	PDF	Oct 27, 2025
APPENDIX C-SPECIFICATIONS-Dredging at USCG Cape Disappointment_03Sep25.pdf	PDF	Oct 27, 2025
APPENDIX E-Contractor Responsibility.pdf	PDF	Oct 27, 2025
APPENDIX A1-Bid Breakdown Sheet.xlsx	XLSX spreadsheet	Oct 27, 2025

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TOP OF SLOPE

TOP OF ECOBLOCKS

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TOE OF SLOPE

APPROXIMATE LOCATION OF

BURIED JETTY. PARTIALLY

OBSERVED IN 2002, BUT BURIED

DURING MARCH 2025 SURVEY.

TOE OF SLOPE

NOTES

EXISTING MAJOR CONTOUR

EXISTING MINOR CONTOUR

RIPRAP SHORELINE PROTECTION (APPROXIMATE)

EELGRASS - SPATIAL DISTRIBUTION

EELGRASS - AREAL EXTENT

EELGRASS - VEGETATED COVER

LEGEND

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APPROXIMATE LOCATION OF 3" OUTFALL

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APPROXIMATE LOCATION OF 12" OUTFALL

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NOAA BENCHMARK "0581 C" IDENTIFIED AS "BBDX15"

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PIER

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GANGWAY

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GANGWAY

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FIXED DOCK

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BREAK WATER

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HAUL OUT PIER

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COVERED AREA

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ABOVE STORAGE AREA

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0.0 MLLW

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8.07' MHHW

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D. STALTERS

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WSP USA

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U. S. COAST GUARD

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USCG. CEU OAKLAND

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USCG CAPE DISAPPOINTMENT DREDGE

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EXISTING CONDITION HYDROGRAPHIC SURVEY

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A. KERN

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STEVEN OSGOOD

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CIVIL

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OAKLAND

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OAKLAND, CALIFORNIA 94612-5203

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P. MCCARTHY

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OAKLAND

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PSN 27853423

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CIVIL

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CIVIL ENGINEERING UNIT OAKLAND

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1301 CLAY STREET SUITE 700N

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T. MARLEY

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D. SCHALL

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WEST

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REV 0

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2025 DREDGE PRISM DESIGN

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AutoCAD SHX Text Brice Engineering, LLC 3700 Centerpoint West, Suite 800 Anchorage, Alaska 99503 Sea Sight Survey, LLC Cle Elum, Washington Merkel & Associates, Inc. 5434 Ruffin Road San Diego, California 92123

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1. BATHYMETRIC DATA IS FROM A SURVEY CONDUCTED BY SEA SIGHT SURVEY, LLC. ON MARCH 29, BATHYMETRIC DATA IS FROM A SURVEY CONDUCTED BY SEA SIGHT SURVEY, LLC. ON MARCH 29, 2025 AND REPRESENTS THE SEA FLOOR CONDITIONS PRESENT ON THAT DATE. THE HYDROGRAPHIC SURVEY WAS CONDUCTED IN ACCORDANCE WITH THE METHODS AND ACCURACIES OUTLINED IN THE CORPS OF ENGINEERS' HYDROGRAPHIC SURVEYING MANUAL (EM 1110-2-1003, NOVEMBER 30, 2013). THE SURVEY WAS PERFORMED USING A 16' SURVEY VESSEL, NORBIT iWBMSh 0.9x0.9 DEG BEAM (MULTIBEAM SONAR), APPLANIX WAVEMASTER II INERTIAL NAVIGATION SYSTEM, AML-3 SOUND VELOCITY PROFILER, PORTUS POLE MOUNT, HEMISPHERE S631 ROVER. 2. HORIZONTAL DATUM IS BASED ON STATE PLANE WASHINGTON ZONE SOUTH (NAD 1983). HORIZONTAL DATUM IS BASED ON STATE PLANE WASHINGTON ZONE SOUTH (NAD 1983). 3. SOUNDINGS ARE IN FEET BELOW MEAN LOWER LOW WATER (MLLW), AS REFERENCED TO NOAA SOUNDINGS ARE IN FEET BELOW MEAN LOWER LOW WATER (MLLW), AS REFERENCED TO NOAA BENCHMARK "0581 C" LOCATED AT COORDINATES: NORTHING: 365,627.12' sFT EASTING: 743,956.89' sFT ELEVATION: 13.35' MLLW. 4. HORIZONTAL COORDINATES ARE FROM AN OPUS SHARED SOLUTION FOR NOAA BENCHMARK "0581 HORIZONTAL COORDINATES ARE FROM AN OPUS SHARED SOLUTION FOR NOAA BENCHMARK "0581 C" RECORDED AS PID: BBDX15, OBSERVED IN 2022. ELEVATION IS FROM PUBLISHED VALUE FOR NOAA BENCHMARK "0581 C" AS FOUND ON NOAA TIDAL BENCHMARK SHEET FOR STATION 9440581. 3. EELGRASS VEGETATED EXTENT IS FROM A SURVEY CONDUCTED BY MERKEL & ASSOCIATES, INC. EELGRASS VEGETATED EXTENT IS FROM A SURVEY CONDUCTED BY MERKEL & ASSOCIATES, INC. ON APRIL 5, 2025, WITHIN THE DEFINED SURVEY EXTENTS. A NEW EELGRASS SURVEY WILL BE REQUIRED PRIOR TO ANY DREDGING.

TOP OF SLOPE

TOP OF ECOBLOCKS

TOP OF SLOPE

TOE OF SLOPE

APPROXIMATE LOCATION OF

BURIED JETTY. PARTIALLY

OBSERVED IN 2002, BUT BURIED

DURING MARCH 2025 SURVEY.

TOE OF SLOPE

DO NOT REMOVE OR DISTURB

ANY RIPRAP OR SHORELINE

PROTECTION. DO NOT

DISTURB HAUL OUT PIER PILES.

DO NOT DREDGE

OUTSIDE

PERMITTED

BOUNDARY

EXISTING MAJOR CONTOUR

EXISTING MINOR CONTOUR

PROPOSED MAJOR CONTOUR

PROPOSED MINOR CONTOUR

PERMITTED MAINTENANCE DREDGING AREA

PROPOSED DREDGE TOE

PROPOSED AREAS BELOW DREDGE TOE TO BE DREDGED

TO -10' MLLW

PROPOSED AREAS ABOVE DREDGE TOE TO BE DREDGED

BASED OFF 3:1 SLOPE FROM PERMITTING LIMITS OR EDGE

OF RIPRAP LIMITS SHOWN (WHICHEVER IS FURTHEST

FROM SHORELINE) WATERWARD TO DREDGE TOE

RIPRAP SHORELINE PROTECTION (APPROXIMATE)

EELGRASS - SPATIAL DISTRIBUTION

EELGRASS - AREAL EXTENT

EELGRASS - VEGETATED COVER

LEGEND

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APPROXIMATE LOCATION OF 3" OUTFALL

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APPROXIMATE LOCATION OF 12" OUTFALL

AutoCAD SHX Text NO DREDGE OVERDEPTH ALONG SHORELINE SLOPE. 3:1 SLOPE STARTING AT PERMITTING LIMITS OR EDGE OF RIPRAP LIMITS SHOWN (WHICHEVER IS FURTHEST FROM SHORELINE) WATERWARD AS TO NOT DISTURB EXISTING SHORELINE RIPRAP PROTECTION.

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NOAA BENCHMARK "0581 C" IDENTIFIED AS "BBDX15"

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FLOATING DOCK

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FLOATING DOCK

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MLBS COVERED MOORING BUILDING

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COVERED BOATHOUSE

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PIER

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GANGWAY

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GANGWAY

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FIXED DOCK

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BREAK WATER

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HAUL OUT PIER

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COVERED AREA

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ABOVE STORAGE AREA

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FLOATING DOCK

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FLOATING DOCK

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MLBS COVERED MOORING BUILDING

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PIER

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GANGWAY

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GANGWAY

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FIXED DOCK

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BREAK WATER

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HAUL OUT PIER

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COVERED AREA

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ABOVE STORAGE AREA

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0.0 MLLW

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8.07' MHHW

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8.07' MHHW

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3:1 SLOPE LIMITS

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3:1 SLOPE LIMITS

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DREDGE TOE LIMITS EL = -10' MLLW

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D. STALTERS

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WSP USA

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U. S. COAST GUARD

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USCG. CEU OAKLAND

AutoCAD SHX Text 2025 Proposed Dredge Prism

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USCG CAPE DISAPPOINTMENT DREDGE

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PROPOSED DREDGE PRISM & PLAN

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A. KERN

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STEVEN OSGOOD

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OAKLAND

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OAKLAND, CALIFORNIA 94612-5203

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P. MCCARTHY

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OAKLAND

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PSN 27853423

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CIVIL ENGINEERING UNIT OAKLAND

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1301 CLAY STREET SUITE 700N

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CIVIL ENGINEERING UNIT

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T. MARLEY

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D. SCHALL

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STATION CAPE DISAPPOINTMENT

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US0041921.9075

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1. BATHYMETRIC DATA IS FROM A SURVEY CONDUCTED BY SEA SIGHT SURVEY, LLC. ON BATHYMETRIC DATA IS FROM A SURVEY CONDUCTED BY SEA SIGHT SURVEY, LLC. ON MARCH 29, 2025 AND REPRESENTS THE SEA FLOOR CONDITIONS PRESENT ON THAT DATE. THE HYDROGRAPHIC SURVEY WAS CONDUCTED IN ACCORDANCE WITH THE METHODS AND ACCURACIES OUTLINED IN THE CORPS OF ENGINEERS' HYDROGRAPHIC SURVEYING MANUAL (EM 1110-2-1003, NOVEMBER 30, 2013). THE SURVEY WAS PERFORMED USING A 16' SURVEY VESSEL, NORBIT iWBMSh 0.9x0.9 DEG BEAM (MULTIBEAM SONAR), APPLANIX WAVEMASTER II INERTIAL NAVIGATION SYSTEM, AML-3 SOUND VELOCITY PROFILER, PORTUS POLE MOUNT, HEMISPHERE S631 ROVER. 2. THIS IS NOT A BOUNDARY SURVEY, AND EXCLUDES MATTERS OF UNWRITTEN RIGHTS. THIS IS NOT A BOUNDARY SURVEY, AND EXCLUDES MATTERS OF UNWRITTEN RIGHTS. 3. EELGRASS VEGETATED EXTENT IS FROM A SURVEY CONDUCTED BY MERKEL & ASSOCIATES, EELGRASS VEGETATED EXTENT IS FROM A SURVEY CONDUCTED BY MERKEL & ASSOCIATES, INC. ON APRIL 5, 2025, WITHIN THE DEFINED SURVEY EXTENTS. A NEW EELGRASS SURVEY WILL BE REQUIRED PRIOR TO ANY DREDGING. 4. DREDGE DEPTH IS 10FT BELOW MLLW. DREDGE DEPTH IS 10FT BELOW MLLW. 5. DREDGE VOLUME WAS CALCULATED USING AUTOCAD CIVIL 3D 2025 COMPOSITE VOLUME DREDGE VOLUME WAS CALCULATED USING AUTOCAD CIVIL 3D 2025 COMPOSITE VOLUME METHOD. COMPUTATIONS INCLUDE MATERIAL WITHIN 3:1 SIDE SLOPE 6. CUT TO -10' MLLW INCLUDING SIDE SLOPES = 7,100 BANK CUBIC YARDS CUT TO -10' MLLW INCLUDING SIDE SLOPES = 7,100 BANK CUBIC YARDS 7. CUT WITH 2-FT OVERDREDGE INCLUDING SIDE SLOPES = 11,000 BANK CUBIC YARDS CUT WITH 2-FT OVERDREDGE INCLUDING SIDE SLOPES = 11,000 BANK CUBIC YARDS 8. DO NOT DREDGE DEEPER THAN ELEVATION -10 FEET ALONG SHORELINE (NO OVERDREDGE). DO NOT DREDGE DEEPER THAN ELEVATION -10 FEET ALONG SHORELINE (NO OVERDREDGE). THE FINAL DREDGE SLOPE ALONG SHORELINE SHALL BE NO STEEPER THAN 3H:1V AND SHALL DAYLIGHT WATERWARD OF ANY RIPRAP SHORELINE PROTECTION 9. DO NOT REMOVE OR DISTURB ANY RIPRAP OR SHORELINE PROTECTION DO NOT REMOVE OR DISTURB ANY RIPRAP OR SHORELINE PROTECTION

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2025 DREDGE PRISM DESIGN

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Brice Engineering, LLC 3700 Centerpoint West, Suite 800 Anchorage, Alaska 99503 Sea Sight Survey, LLC Cle Elum, Washington Merkel & Associates, Inc. 5434 Ruffin Road San Diego, California 92123

C D

E F F'E'

D'C'

DREDGE PRISM (-10 MLLW) DREDGE OVERDEPTH (-12 MLLW)

DREDGE PRISM (-10 MLLW) DREDGE OVERDEPTH (-12 MLLW) DREDGE PRISM (-10 MLLW) DREDGE OVERDEPTH (-12 MLLW)

DREDGE PRISM (-10 MLLW) DREDGE OVERDEPTH (-12 MLLW)

DREDGE PRISM (-10 MLLW)

DREDGE OVERDEPTH (-12 MLLW)

EXISTING GRADE

EXISTING GRADE EXISTING GRADE

EXISTING GRADE

APPROXIMATE RIPRAP EXTENT, DEPTH

UNKNOWN. DO NOT REMOVE OR DISTURB

ANY RIPRAP OR SHORELINE PROTECTION

EDGE OF PERMITTED

DREDGE AREA

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BOUNDARY

APPROXIMATE RIPRAP EXTENT, DEPTH

UNKNOWN. DO NOT REMOVE OR DISTURB

ANY RIPRAP OR SHORELINE PROTECTION

APPROXIMATE RIPRAP EXTENT, DEPTH

UNKNOWN. DO NOT REMOVE OR DISTURB

ANY RIPRAP OR SHORELINE PROTECTION

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D. STALTERS

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WSP USA

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U. S. COAST GUARD

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USCG. CEU OAKLAND

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USCG CAPE DISAPPOINTMENT DREDGE

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A. KERN

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STEVEN OSGOOD

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CIVIL

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OAKLAND

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OAKLAND, CALIFORNIA 94612-5203

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P. MCCARTHY

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OAKLAND

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PSN 27853423

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CIVIL

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CIVIL ENGINEERING UNIT OAKLAND

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1301 CLAY STREET SUITE 700N

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CIVIL ENGINEERING UNIT

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T. MARLEY

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D. SCHALL

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STATION CAPE DISAPPOINTMENT

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US0041921.9075

AutoCAD SHX Text Portland, OR 97224

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CONSULTANTS

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PROJECT MGR

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TECHNICAL DIRECTOR

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DISCIPLINE/SHT NO

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A/E PROJECT NO:

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CAD FILE NAME:

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SHEET TITLE

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MARK

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ISSUE

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DESCRIPTION

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DATE

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DIVISION CHIEF

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APPROVED BY:

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AutoCAD SHX Text 15'

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SCALE: 1" = 30' NO VERTICAL EXAGGERATION

AutoCAD SHX Text THIS DRAWING IS FULL SIZE WHEN PLOTTED 24"x36"

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REV 0

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2025 DREDGE PRISM DESIGN

AutoCAD SHX Text 09/12/2025

Brice Engineering, LLC 3700 Centerpoint West, Suite 800 Anchorage, Alaska 99503 Sea Sight Survey, LLC Cle Elum, Washington Merkel & Associates, Inc. 5434 Ruffin Road San Diego, California 92123

File details come from the government source that posted it. Updated Oct 27, 2025.