U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8664662 PUBLICATION DATE: 02/05/2004 Name: ARMY DEPOT, COOPER RIVER SC NOAA Chart: 11527 Latitude: 32° 54.6' N ( 32.91000) USGS Quad: NORTH CHARLESTON Longitude: 79° 57.1' W ( -79.95170) To reach the tidal bench marks from the intersection of U.S. Highway 52 (Rivers Avenue) and Remount Road in North Charleston, proceed east on Remount Road for 4.3 km (2.7 mi) to the entrance to U.S. Army Charleston Storage Activity (TROSCOM), then turn left and go north through the guard gate on Virginia Avenue to Avenue A, then turn right and proceed east on Avenue A for 1.0 km (0.6 mi) to Perimeter Road, then turn right and proceed on Perimeter Road for 0.3 km (0.2 mi) to Dock Road, then turn left and proceed east on Dock Road for 1.0 km (0.6 mi) to Basin Road, then turn left and proceed NE onto Basin Road to the Goose Creek wood pier just past the sharp bend in the road. The bench marks are along Basin Street and in the area around the concrete pier. The tide gage and staff were on the west end of the Goose Creek wood pier. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: CREEK 1976 DESIGNATION: CREEK MONUMENTATION: Survey disk VM#: 4082 AGENCY: US Army Corps of Engineers (USE) IDB PID#: CJ1477 SETTING CLASSIFICATION: Concrete pier OPUS PID#: CJ1477 LATITUDE: 32° 54.5' N ( 32.90830) LONGITUDE: 79° 57.1' W ( -79.95170) The primary bench mark is a disk set flush in the NE end of the concrete pier, 12.22 m (40.1 ft) south of the NW edge of the pier, 3.57 m (11.7 ft) south of fire hydrant #855, 1.83 m (6.0 ft) north of the NE edge of the pier, and 0.43 m (1.4 ft) SE of the SE railroad track.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8664662 PUBLICATION DATE: 02/05/2004 Name: ARMY DEPOT, COOPER RIVER SC NOAA Chart: 11527 Latitude: 32° 54.6' N ( 32.91000) USGS Quad: NORTH CHARLESTON Longitude: 79° 57.1' W ( -79.95170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 4 1942 DESIGNATION: 866 4662 TIDAL 4 MONUMENTATION: Tidal Station disk VM#: 4080 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: CJ0217 SETTING CLASSIFICATION: Concrete pier OPUS PID: LATITUDE: 32° 54.4' N ( 32.90670) LONGITUDE: 79° 57.3' W ( -79.95500) The bench mark is a disk set flush in the SW end of the concrete pier, 12.65 m (41.5 ft) SE of a light pole, 1.22 m (4.0 ft) NNW of the SE corner of the pier, and 0.91 m (3.0 ft) NNE of the south corner of the pier. BENCH MARK STAMPING: 4662 C 1976 DESIGNATION: 866 4662 C MONUMENTATION: Metal Rod VM#: 4081 AGENCY: National Ocean Survey (NOS) IDB PID#: CJ1476 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 32° 54.4' N ( 32.90670) LONGITUDE: 79° 57.3' W ( -79.95500) The bench mark is a metal rod set along Basin Road near the gate in the fence separating the Army Depot and the Port Terminal properties, 14.26 m (46.8 ft) NW of the steps at the SW end of the concrete pier, 9.39 m (30.8 ft) SE of a pipeline, 2.44 m (8.0 ft) from a metal witness post and sign, and 1.46 m (4.8 ft) NNE of the wire fence gate. The datum point is level with the ground, being the top of a copper-clad steel rod driven 12.2 m (40 ft) to refusal, and encased in a PVC pipe and concrete kickblock. NOTE: A disk was formerly crimped to the top of the rod but was removed.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8664662 PUBLICATION DATE: 02/05/2004 Name: ARMY DEPOT, COOPER RIVER SC NOAA Chart: 11527 Latitude: 32° 54.6' N ( 32.91000) USGS Quad: NORTH CHARLESTON Longitude: 79° 57.1' W ( -79.95170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4662 E 1987 DESIGNATION: 866 4662 E MONUMENTATION: Tidal Station disk VM#: 4083 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 32° 54.8' N ( 32.91330) LONGITUDE: 79° 57.3' W ( -79.95500) The bench mark is a disk set at the base of building #838 near the intersection of Dock and Basin Roads, 23.47 m (77.0 ft) east of the centerline of Dock Road, 21 m (69 ft) NNW of power pole #3901, 12.2 m (40.0 ft) NNW of the centerline of Basin Road, and 1.22 m (4.0 ft) ENE of building #838. The bench mark is 0.73 m (2.4 ft) below the ground, crimped to a copper-clad steel rod driven 6.7 m (22 ft) to refusal, and encased in a 4-inch PVC pipe with a plug and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8664662 PUBLICATION DATE: 02/05/2004 Name: ARMY DEPOT, COOPER RIVER SC NOAA Chart: 11527 Latitude: 32° 54.6' N ( 32.91000) USGS Quad: NORTH CHARLESTON Longitude: 79° 57.1' W ( -79.95170) T I D A L D A T U M S Tidal datums at ARMY DEPOT, COOPER RIVER based on: LENGTH OF SERIES: 2 YEARS TIME PERIOD: July 1987 - June 1989 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8665530 CHARLESTON, COOPER RIVER ENTRANCE Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (09/22/1989) = 3.143 MEAN HIGHER HIGH WATER MHHW = 1.809 MEAN HIGH WATER MHW = 1.707 North American Vertical Datum NAVD88 = 0.971 MEAN SEA LEVEL MSL = 0.957 MEAN TIDE LEVEL MTL = 0.883 MEAN LOW WATER MLW = 0.059 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (04/07/1989) = -0.664 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW CREEK 1976 3.506 1.799 NO 4 1942 3.511 1.804 4662 C 1976 2.208 0.501 4662 E 1987 1.958 0.251
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8664662 PUBLICATION DATE: 02/05/2004 Name: ARMY DEPOT, COOPER RIVER SC NOAA Chart: 11527 Latitude: 32° 54.6' N ( 32.91000) USGS Quad: NORTH CHARLESTON Longitude: 79° 57.1' W ( -79.95170) D E F I N I T I O N S Mean Sea Level (MSL) is a tidal datum determined over a 19-year National Tidal Datum Epoch. It pertains to local mean sea level and should not be confused with the fixed datums of North American Vertical Datum of 1988 (NAVD88). NAVD88 is a fixed datum derived from a simultaneous, least squares, minimum constraint adjustment of Canadian/Mexican/United States leveling observations. Local mean sea level observed at Father Point/Rimouski, Canada was held fixed as the single initial constraint. NAVD88 replaces NGVD29 as the national standard geodetic reference for heights. Bench mark elevations relative to NAVD88 are available from NGS through the World Wide Web at National Geodetic Survey. NGVD29 is a fixed datum adopted as a national standard geodetic reference for heights but is now considered superseded. NGVD29 is sometimes referred to as Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological Survey Topographic Quads. NGVD29 was originally derived from a general adjustment of the first-order leveling networks of the U.S. and Canada after holding mean sea level observed at 26 long term tide stations as fixed. Numerous local and wide-spread adjustments have been made since establishment in 1929. Bench mark elevations relative to NGVD29 are available from the National Geodetic Survey (NGS) data base via the World Wide Web at National Geodetic Survey. NAVD88 and NGVD29 are fixed geodetic datums whose elevation relationships to local MSL and other tidal datums may not be consistent from one location to another. The Vertical Mark Number (VM#) and PID# shown on the bench mark sheet are unique identifiers for bench marks in the tidal and geodetic databases, respectively. Each bench mark in either database has a single, unique VM# and/or PID# assigned. Where both VM# and PID# are indicated, both tidal and geodetic elevations are available for the bench mark listed. The NGS's Integrated Data Base (IDB PID) provides geodetic datum based on traditionally leveled and bluebooked ties to the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/. The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/. The NAVD88 elevation is shown on the Elevations of Tidal Datums Table Referred to MLLW only when two or more of the bench marks listed have NAVD88 elevations. The NAVD88 elevation relationship shown in the table is derived from an average of several bench mark elevations relative to tide station datum. As a result of this averaging, NAVD88 bench mark elevations computed indirectly from the tidal datums elevation table may differ slightly from NAVD88 elevations listed for each bench mark in the NGS database.