APPENDIX B2-2023 Hydro Survey.pdf
PDF 2 MB Posted
- Attached to
- MAINTENANCE DREDGING AT THE U. S. COAST GUARD (USCG), STATION CAPE DISAPPOINTMENT, ILWACO, WA - FY 2024
- Solicitation number
- 70Z08824B0000113
About this file
This document contains a federal contract solicitation and related hydrographic survey report. The solicitation is for maintenance dredging services at the U.S. Coast Guard Station in Cape Disappointment, Washington. Services include conducting dredging, pre-and post-dredge surveys, disposal of dredged materials, internet monitoring of operations, and compliance with environmental permits. The work window closes June 1, 2024 and all dredging must be completed by this date. The procurement value is estimated between $1,000,000 to $5,000,000. The solicitation will result in a firm fixed-price contract awarded by the Department of Homeland Security's U.S. Coast Guard. The hydrographic survey report provides bathymetric data and details from a post-dredging survey conducted in February 2023, with soundings, contours, notes on equipment and procedures, and a quantity summary indicating material removed.
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Text version
MLBS COVERED MOORING
BUILDING COVERED BOATHOUSE
MLBS COVERED MOORING
BUILDING COVERED BOATHOUSE
0+
1+
2+
3+
START: 0+00.00
END: 3+00.00
F
F'
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SECTION F-F'
-20
-10
-20
-10
0+00 1+00 2+00
Post-Dredge - Feb 3. 2023
DREDGE PRISM (-10 MLLW)
DREDGE OVERDEPTH (-12 MLLW)
EDGE OF PERMITTED
DREDGE AREA
EDGE OF PERMITTED
DREDGE AREA
EL
EV
AT
IO
N (F
T)
F F'
3+00
THIS HYDROGRAPHIC SURVEY WAS COMPLETED BY AN AMERICAN CONGRESS ON SURVEYING AND MAPPING CERTIFIED HYDROGRAPHER.
JAMES W. GLAESER DATE
NSPS-THSOA CERTIFIED HYDROGRAPHER #222
NORTHWEST HYDRO INC.
31 COUGAR CREEK RD.
SKAMANIA, WA 98648
PH (360) 241-7313
EMAIL: james@northwesthydro.com
SURVEY CONTROL POINT TABLE
POINT NORTHING EASTING ELEVATION DESCRIPTION
0581 C 2015 365627.100 743956.580 13.34 STEEL ROD
Scale: 1" = 30'
NOTES:
1. HORIZONTAL DATUM: NAD83-11 WASHINGTON SOUTH SPC. COORDINATES BASED ON RTK CORRECTIONS RECEIVED
FROM THE WASHINGTON REFERENCE NETWORK (WSRN).
2. UNITS: U.S. SURVEY FEET
3. VERTICAL DATUM: MEAN LOWER LOW WATER (MLLW). MLLW VERTICAL DATUM ESTABLISHED FROM NOAA BENCHMARK "0581 C" AND NOAA TIDE STATION CAPE DISAPPOINTMENT (STATION ID 9440581). SEE SURVEY
CONTROL TABLE FOR PROJECT MONUMENT USED FOR THIS MAPPING.
4. CONTOUR INTERVAL: 1 FOOT. CONTOURS WERE DEVELOPED FROM A GRIDDED 1 FT X 1FT DATASET USING AN
INVERSED WEIGHTED AVERAGE OF ALL SOUNDINGS.
5. ALL HORIZONTAL POSITIONING AND VESSEL ATTITUDE WAS PROVIDED IN REAL TIME USING AN APPLANIX POS-MV RTK GPS AIDED INERTIAL SENSOR. RTK CORRECTIONS WERE RECEIVED THE WASHINGTON STATE
REFERENCE NETWORK (WSRN)
6. SOUNDINGS WERE COLLECTED USING A R2SONIC 2022 MULTIBEAM SONAR SYSTEM AND DATA PROCESSING WAS
COMPLETED USING HYPACK HYSWEEP SOFTWARE.
7. THIS BATHYMETRIC SURVEY IS REPRESENTATIVE OF THE GENERAL CONDITION OF THE RIVERBED AT THE TIME OF THE SURVEY. THE CONDITION OF THE BOTTOM MAY CHANGE AT ANY TIME AFTER THE DATE OF THIS SURVEY.
8. ALL BATHYMETRIC DATA WAS COLLECTED IN ACCORDANCE WITH THE U.S ARMY CORPS OF ENGINEERS
HYDROGRAPHIC SURVEY MANUAL EM-1110-02-1003 (NOVEMBER 2013).
US Coast Guard - Cape Disappointment Dredging Post-Dredge Bathymetric Survey
Columbia River Data Collected: February 3, 2023
0 30 60
INDICATES -10 MLLW DREDGE AREA
LEGEND
February 6, 2023
2023 USCG CAPE DISAPPOINTMENT DREDGE QTY
Minimum Dredge Elev +1 Allowable Over-dredge Total Dredge Qty Avail.
Pre-Dredge Available 10,229 cy 4,821 cy 15,050 cy Post- Dredge Available 189 cy 1,553 cy 1,742 cy Pay Quantity Removed 10,040 cy 3,268 cy 13,308 cy
Project Total Quantity Removed 15,154 cy
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