ATTACHMENT C - Q58DCSRestoration_Bathymetric Condition Survey 10_2023.pdf

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NSN, Q-58 DCS Restoration
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This is a bathymetric condition survey document prepared by the Naval Facilities Engineering Command (NAVFAC) Mid-Atlantic Region Hydrographic Branch in Norfolk, Virginia. The survey was conducted on October 12, 2023, at the Norfolk Deperming Station Q58 Tower in Norfolk, Virginia, and depicts depth soundings relative to NOAA Mean Lower Low Water (MLLW) datum in feet.

The survey employed Class 1 hydrographic survey methods using a Reson T50 and/or T20 multi-beam sonar system with horizontal positions obtained via Applanix POS/MV GPS with network RTK and/or POSPAC PPK corrections and NOAA VDATUM models. Horizontal datum reference is the Virginia State Plane Coordinate System, Zone 4502, in U.S. Survey Feet (NAD83). Multibeam survey data was processed using HYPACK/HYSWEEP software with a cell size of 20' x 20' for display purposes and 5' x 5' for volume calculations, both utilizing average depth statistics. The survey area extends approximately 600 feet to the edge of Norfolk Harbor Channel, with depth ranges color-coded from less than 6.00 feet (red) to greater than or equal to 30.00 feet (dark blue). The document was processed, drawn, and checked by B. O'Malley and includes coordinate reference data showing positions in both X and Y state plane coordinates along the survey boundaries.

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No. Date Revision BY

MID-ATLANTIC REGION - CI CORE

HYDROGRAPHIC BRANCH

NORFOLK, VIRGINIA

NAVFAC DRAWING NO:

Lead Surveyor:

Processed By:

Drawn By:

Checked By:

MAXIMO:

JOB ORDER NO:

WORK ORDER NO:

NORFOLK DEPERMING STATION Q58 TOWER - NORFOLK, VA

SCALE: 1" = 60' SHEET 1 OF 1

B. O'Malley

B. O'Malley

B. O'Malley

BATHYMETRIC CONDITION SURVEY - OCTOBER 2023

OCTOBER 12, 2023

SURVEY NOTES:

1. DEPTH SOUNDINGS SHOWN HEREIN ARE IN FEET AND REFER TO THE NOAA MEAN LOWER LOW WATER (MLLW) DATUM.

2. THE HYDROGRAPHIC SURVEY WAS CONDUCTED USING CLASS 1 HYDROGRAPHIC SURVEY METHODS & ACCURACIES OUTLINED IN THE CORPS OF ENGINEERS' HYDROGRAPHIC SURVEYING MANUAL (EM 1110-2-1003).

3. ALL SOUNDINGS WERE RECORDED USING A RESON T50 AND/OR T20 MULTI-BEAM SONAR SYSTEM WITH HORIZONTAL POSITIONS OBTAINED VIA APPLANIX POS/MV GPS W/MRU UTILIZING NETWORK RTK AND/OR

POSPAC PPK CORRECTIONS AND NOAA VDATUM MODELS.

4. HORIZONTAL DATUM: VIRGINIA STATE PLANE COORDINATE SYSTEM, ZONE 4502, U.S. SURVEY FEET (NAD83).

5. MULTIBEAM SURVEY DATA DEPICTED AND/OR USED FOR CALCULATING VOLUMES IS REPRESENTATIVE OF A LARGER

DATA SET AND HAS BEEN PROCESSED USING HYPACK/HYSWEEP SOFTWARE AS FOLLOWS:

SOUNDING DATA FOR DISPLAY:

CELL SIZE: 20' X 20', SOUNDING POSITION: CENTER OF CELL, CELL STATISTICS: AVERAGE DEPTH.

SOUNDING DATA FOR VOLUME CALCULATIONS:

CELL SIZE: 5' X 5', SOUNDING POSITION: CENTER OF CELL, CELL STATISTICS: AVERAGE DEPTH.

6. SURVEY DATE(S) OCTOBER 12, 2023.

DEPTHS SHOWN

ARE RELATIVE

TO NOAA MLLW

DCS

+/- 600' TO EDGE OF

NORFOLK HARBOR

CHANNEL

DCS

AREA MAP (NTS)

MSF SHALLOW RANGE

North

< 6.00

6.00 - 7.99

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12.00 - 13.99

14.00 - 15.99

16.00 - 17.99

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20.00 - 21.99

22.00 - 23.99

24.00 - 25.99

26.00 - 27.99

28.00 - 29.99

>= 30.00

100 200 300 40050

Scale: 1 Inch = 60.00 Feet Feet

File details come from the government source that posted it. Updated .