U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 4 Station ID: 8664022 PUBLICATION DATE: 04/21/2003 Name: GEN. DYNAMICS PIER, COOPER R. SC NOAA Chart: 11527 Latitude: 33° 0.5' N ( 33.00830) USGS Quad: KITTREDGE Longitude: 79° 55.4' W ( -79.92330) To reach the tidal bench marks from the junction of U.S. Highway 52 and U.S. Highway 176 at Goose Creek, proceed SE on Red Bank Road (County Road S-8-29) for 10.9 km (6.8 mi) to Bushy Park Road (Country Road S-8-503), (also 6.0 km (3.7 mi) east along Red Bank Road from its intersection with N. Rhett Avenue extencded), thence 5.6 km (3.5 mi) northerly along Bushy Park Road to the entrance of the former General Dynamics Corporation now operated by the Marine Energy Systems Corporation (MESC) at 2040 Bushy Park Road. Thence 0.72 km (0.45 mi) east through the security gate along the road to the north side of the barge slip. The primary bench mark is located in the vicinity of the barge slip and the tide gage pier. The tide gage and staff were located on a pier just north of the barge slip. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 4022 A 1976 DESIGNATION: 866 4022 A TIDAL MONUMENTATION: Tidal Station disk VM#: 606 AGENCY: National Ocean Survey (NOS) IDB PID#: DD1303 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 33° 0.5' N ( 33.00830) LONGITUDE: 79° 55.3' W ( -79.92170) The primary bench mark is a disk located in the vicinity of the barge slip and the tide gage pier, 15.06 m (49.4 ft) SW of the SW corner of the wooden pier, 7.32 m (24.0 ft) north of the top of the rock bank at the barge slip, and 0.3 m (1.0 ft) east of utility pole SPSJ 1-70 KD. The bench mark is set at ground level, crimped to a copper-clad steel rod driven 4.91 m (16.1 ft) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 4 Station ID: 8664022 PUBLICATION DATE: 04/21/2003 Name: GEN. DYNAMICS PIER, COOPER R. SC NOAA Chart: 11527 Latitude: 33° 0.5' N ( 33.00830) USGS Quad: KITTREDGE Longitude: 79° 55.4' W ( -79.92330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4022 C 1976 DESIGNATION: 866 4022 C TIDAL MONUMENTATION: Tidal Station disk VM#: 608 AGENCY: National Ocean Survey (NOS) IDB PID#: DD1301 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 33° 0.6' N ( 33.01000) LONGITUDE: 79° 55.5' W ( -79.92500) The bench mark is a disk located near the NE corner of the large green aluminum sided sub-assembly building, 11.70 m (38.4 ft) south of the gravel road around the building, 5.64 m (18.5 ft) NW of the NE corner of the building, and 2.35 m (7.7 ft) north of the north face of the building at the most easterly entrance on the north side of the building. The bench mark is set at ground level, crimped to a copper-clad steel rod driven 3.69 m (12.1 ft) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: 4022 F 1982 DESIGNATION: 866 4022 F MONUMENTATION: Bench Mark disk VM#: 609 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete slab OPUS PID: LATITUDE: 33° 0.6' N ( 33.01000) LONGITUDE: 79° 55.6' W ( -79.92670) The bench mark is a disk set flush in the NE corner of a 4 m x 7 m (13.1 ft x 23 ft) concrete slab near the NE corner of the north wing of a large green aluminum sided sub-assembly building, 31.85 m (104.5 ft) NW of the NW corner of the most northwesterly concrete slab with a 5-inch PVC pipe filled with concrete, 11.52 m (37.8 ft) north of the NE corner of the north wing of the building, 7.83 m (25.7 ft) SE of the centerline of a dirt road, and 0.70 m (2.3 ft) south of the north corner of a concrete base supporting liquid oxygen tank.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 4 Station ID: 8664022 PUBLICATION DATE: 04/21/2003 Name: GEN. DYNAMICS PIER, COOPER R. SC NOAA Chart: 11527 Latitude: 33° 0.5' N ( 33.00830) USGS Quad: KITTREDGE Longitude: 79° 55.4' W ( -79.92330) T I D A L D A T U M S Tidal datums at GEN. DYNAMICS PIER, COOPER R. based on: LENGTH OF SERIES: 16 Years TIME PERIOD: January 1977 - December 1992 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 (09/04/1979) = 2.447 MEAN HIGHER HIGH WATER MHHW = 1.477 MEAN HIGH WATER MHW = 1.390 MEAN SEA LEVEL MSL = 0.792 MEAN TIDE LEVEL MTL = 0.727 North American Vertical Datum NAVD88 = 0.665 MEAN LOW WATER MLW = 0.063 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (01/28/1986) = -0.756 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 4022 A 1976 2.380 0.990 4022 C 1976 2.835 1.445 4022 F 1982 3.121 1.731
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 4 Station ID: 8664022 PUBLICATION DATE: 04/21/2003 Name: GEN. DYNAMICS PIER, COOPER R. SC NOAA Chart: 11527 Latitude: 33° 0.5' N ( 33.00830) USGS Quad: KITTREDGE Longitude: 79° 55.4' W ( -79.92330) 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.