U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8663665 PUBLICATION DATE: 02/05/2004 Name: RICHMOND PLANTATION, E. BR. COOPER RIVER SC NOAA Chart: 11527 Latitude: 33° 4.6' N ( 33.07670) USGS Quad: HUGER Longitude: 79° 51.3' W ( -79.85500) To reach the tidal bench marks from the intersection of State Highway 41 and State Highway 402 in Huger, proceed north on State Highway 402 for 10.6 km (6.6 mi) to the entrance of Richmond Plantation Girl Scout Camp, then turn into the camp and proceed SE on the entrance road for 5.07 km (3.15 mi) to a brick gate, then continue SE through the gate on the sand road for 0.40 km (0.25 mi) to a large brick house (administration building). The bench marks are located on the Camp grounds. The tide gage and staff were located on the dock SE of the brickhouse. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 3665 A 1976 DESIGNATION: 866 3665 A TIDAL MONUMENTATION: Tidal Station disk VM#: 4008 AGENCY: National Ocean Survey (NOS) IDB PID#: DD1225 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 33° 4.7' N ( 33.07830) LONGITUDE: 79° 51.4' W ( -79.85670) The primary bench mark is a disk located north of a small wooden bridge that spans a canal ditch on the grass track road leading to the dock, 53.58 m (175.8 ft) ESE of a twin limbed 2.29 m (7.5 ft) diameter oak tree, 6.43 m (21.1 ft) north of the north corner of the wooden bridge, 4.57 m (15.0 ft) ENE of the centerline of the grass track road leading to the dock, 4 m (12 ft) NW of the NW edge of the canal ditch, and 1.95 m (6.4 ft) WNW of a 0.46 m (1.5 ft) diameter palmetto tree. The bench mark is at ground level, crimped to the top of a copper clad steel rod driven 7.3 m (24 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 5 Station ID: 8663665 PUBLICATION DATE: 02/05/2004 Name: RICHMOND PLANTATION, E. BR. COOPER RIVER SC NOAA Chart: 11527 Latitude: 33° 4.6' N ( 33.07670) USGS Quad: HUGER Longitude: 79° 51.3' W ( -79.85500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 3665 B 1976 DESIGNATION: 866 3665 B TIDAL MONUMENTATION: Tidal Station disk VM#: 4009 AGENCY: National Ocean Survey (NOS) IDB PID#: DD1224 SETTING CLASSIFICATION: Copper pipe OPUS PID: LATITUDE: 33° 4.7' N ( 33.07830) LONGITUDE: 79° 51.4' W ( -79.85670) The bench mark is a disk located west of the small wooden bridge that spans a canal ditch on the grass track road leading to the dock, 21.34 m (70.0 ft) east of the center of a bamboo tree/bush, 8.72 m (28.6 ft) SSW of bench mark 3665 A 1976, 3.81 m (12.5 ft) NNE of a 2.04 m (6.7 ft) diameter oak tree, 3.32 m (10.9 ft) WNW of the west corner of the wooden bridge, and 3.26 m (10.7 ft) SW of the centerline of the grass track road leading to the dock. The bench mark is at ground level, brazed to the top of a 2-inch diameter copper pipe driven 1.2 m (4 ft) into the ground, and encased in compacted soilcrete. BENCH MARK STAMPING: 3665 C 1976 DESIGNATION: 866 3665 C TIDAL MONUMENTATION: Tidal Station disk VM#: 4010 AGENCY: National Ocean Survey (NOS) IDB PID#: DD1223 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 33° 4.7' N ( 33.07830) LONGITUDE: 79° 51.4' W ( -79.85670) The bench mark is a disk located SE of the brick house on the SW side of the grass track road leading to the dock, 79.25 m (260.0 ft) NNW of bench mark 3665 B 1976, 51.57 m (169.2 ft) SE of the SE corner of the brick house, 7.16 m (23.5 ft) SW of the centerline of the road, 5.79 m (19.0 ft) west of a 0.61 m (2.0 ft) diameter sweet gum tree with a 6 on it, and 4.45 m (14.6 ft) north of a twin trunked holly tree. The bench mark is at ground level, crimped to the top of a copper clad steel rod driven 3.7 m (12 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 3 of 5 Station ID: 8663665 PUBLICATION DATE: 02/05/2004 Name: RICHMOND PLANTATION, E. BR. COOPER RIVER SC NOAA Chart: 11527 Latitude: 33° 4.6' N ( 33.07670) USGS Quad: HUGER Longitude: 79° 51.3' W ( -79.85500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 3665 D 1976 DESIGNATION: 866 3665 D TIDAL MONUMENTATION: Tidal Station disk VM#: 4011 AGENCY: National Ocean Survey (NOS) IDB PID#: DD1222 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 33° 4.8' N ( 33.08000) LONGITUDE: 79° 51.4' W ( -79.85670) The bench mark is a disk located at the east corner of the intersection of a sand road leading to some cabins and the grass track road leading to the dock, near an old iron street lamp beside the brick house, 48.46 m (159.0 ft) NNE of the north corner of the brick house, 15 m (49 ft) ESE of a lone magnolia tree, 8 m (26 ft) ENE of the centerline of the grass track road, 7.38 m (24.2 ft) SSE of the centerline of the sand road leading to the cabins, and 4.27 m (14.0 ft) ESE of the street lamp. The bench mark is at ground level, crimped to the top of a copper-clad steel rod driven 5.5 m (18 ft) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: 3665 E 1976 DESIGNATION: 866 3665 E TIDAL MONUMENTATION: Tidal Station disk VM#: 4012 AGENCY: National Ocean Survey (NOS) IDB PID#: DD1221 SETTING CLASSIFICATION: Copper pipe OPUS PID: LATITUDE: 33° 4.8' N ( 33.08000) LONGITUDE: 79° 51.5' W ( -79.85830) The bench mark is a disk near the SE corner of the brick wall surrounding a garden NW of the brick house, 29.57 m (97.0 ft) WSW of the main sand road, 6.55 m (21.5 ft) NNE of a 2.04 m (6.7 ft) diameter oak tree, 1.52 m (5.0 ft) SW of the SE corner of the brick wall, 0.64 m (2.1 ft) SSE of the brick wall, and at ground level. The bench mark is set at ground level, brazed to the top of a 2-inch diameter copper pipe driven 1.2 m (4 ft) into the ground, and encased in compacted soilcrete.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8663665 PUBLICATION DATE: 02/05/2004 Name: RICHMOND PLANTATION, E. BR. COOPER RIVER SC NOAA Chart: 11527 Latitude: 33° 4.6' N ( 33.07670) USGS Quad: HUGER Longitude: 79° 51.3' W ( -79.85500) T I D A L D A T U M S Tidal datums at RICHMOND PLANTATION, E. BR. COOPER RIVER based on: LENGTH OF SERIES: 1 YEAR TIME PERIOD: September 1976 - August 1977 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8664022 GEN. DYNAMICS PIER, COOPER R. Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (11/21/1976) = 1.294 MEAN HIGHER HIGH WATER MHHW = 0.952 MEAN HIGH WATER MHW = 0.891 MEAN SEA LEVEL MSL = 0.520 MEAN TIDE LEVEL MTL = 0.484 North American Vertical Datum NAVD88 = 0.164 MEAN LOW WATER MLW = 0.078 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (02/25/1977) = -0.547 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 3665 A 1976 1.739 0.848 3665 B 1976 1.816 0.925 3665 C 1976 5.885 4.994 3665 D 1976 9.250 8.359 3665 E 1976 8.499 7.608
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8663665 PUBLICATION DATE: 02/05/2004 Name: RICHMOND PLANTATION, E. BR. COOPER RIVER SC NOAA Chart: 11527 Latitude: 33° 4.6' N ( 33.07670) USGS Quad: HUGER Longitude: 79° 51.3' W ( -79.85500) 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.