U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8667178 PUBLICATION DATE: 05/23/2003 Name: POINT OF PINES, N. EDISTO R. SC NOAA Chart: 11522 Latitude: 32° 35.1' N ( 32.58500) USGS Quad: ROCKVILLE Longitude: 80° 13.7' W ( -80.22830) To reach the tidal bench marks from Edisto Island Post Office, proceed NE on County Road S-10-1452 for 3.1 km (1.9 mi) until the paved road becomes a dirt road, then proceed on the private dirt road for 2.7 km (1.7 mi) to the west bank of North Edisto River. The bench marks are along the berm line and adjacent field. The tide gauge and staff were on a platform constructed 61 m (200 ft) offshore NE of bench mark 7178 E 1977. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 7178 E 1977 DESIGNATION: 866 7178 E TIDAL MONUMENTATION: Tidal Station disk VM#: 11317 AGENCY: National Ocean Survey (NOS) IDB PID#: CK2515 SETTING CLASSIFICATION: Galvanized steel rod OPUS PID: LATITUDE: 32° 35.1' N ( 32.58500) LONGITUDE: 80° 13.6' W ( -80.22670) The primary bench mark is a disk located along the beach just above the berm line, 19.20 m (63.0 ft) SSE of a 1.07 m (3.5 ft) diameter oak tree, 16.31 m (53.5 ft) north of a cluster of three oak trees, 16.03 m (52.6 ft) east of a lone 0.3 m (1 ft) diameter palmetto tree, 4.88 m (16.0 ft) SE of an old barb wire fence leading into the river, and 0.91 m (3.0 ft) east of a witness post. The bench mark is 6 cm (0.2 ft) above the ground, crimped to a galvanized steel rod driven 11.3 m (37 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 6 Station ID: 8667178 PUBLICATION DATE: 05/23/2003 Name: POINT OF PINES, N. EDISTO R. SC NOAA Chart: 11522 Latitude: 32° 35.1' N ( 32.58500) USGS Quad: ROCKVILLE Longitude: 80° 13.7' W ( -80.22830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: OAK NO 2 1933 DESIGNATION: OAK RM 2 MONUMENTATION: Reference Mark disk VM#: 11313 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: CK5142 SETTING CLASSIFICATION: Concrete post OPUS PID: LATITUDE: 32° 35.1' N ( 32.58500) LONGITUDE: 80° 13.7' W ( -80.22830) The bench mark is a disk set in the top of a 0.30 m (1.0 ft) diameter round concrete post located inland from the beach, 23 m (75 ft) west of the high water line, 4.27 m (14.0 ft) east of a 0.76 m (2.5 ft) diameter palmetto tree, 4.27 m (14.0 ft) NW of the center of a group of three palmetto trees which are 0.46 m (1.5 ft) in diameter, and 8 cm (0.25 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 8667178 PUBLICATION DATE: 05/23/2003 Name: POINT OF PINES, N. EDISTO R. SC NOAA Chart: 11522 Latitude: 32° 35.1' N ( 32.58500) USGS Quad: ROCKVILLE Longitude: 80° 13.7' W ( -80.22830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: OAK 1963 DESIGNATION: OAK MONUMENTATION: Azimuth Mark disk VM#: 11314 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: CK3356 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 32° 35.1' N ( 32.58500) LONGITUDE: 80° 13.7' W ( -80.22830) The bench mark is a disk set in the top of a concrete monument located along the NW edge of an irrigation ditch and tree-brush line, 1.0 km (0.6 mi) west of the river bank, 54 m (178 ft) NNW of the center of the road in the tree gap, 4.57 m (15.0 ft) west of the centerline of a dirt road along the side of the field, 4.21 m (13.8 ft) east of a fence line, 0.3 m (1.0 ft) SSE of a fiberglass witness post, and at ground level. BENCH MARK STAMPING: 7178 C 1977 DESIGNATION: 866 7178 C TIDAL MONUMENTATION: Tidal Station disk VM#: 11315 AGENCY: National Ocean Survey (NOS) IDB PID#: CK2513 SETTING CLASSIFICATION: Galvanized steel rod OPUS PID: LATITUDE: 32° 35.1' N ( 32.58500) LONGITUDE: 80° 13.6' W ( -80.22670) The bench mark is a disk located along the beach just above the berm line, 32 m (105 ft) SE of the NW corner of an old tabby ruin, 28.74 m (94.3 ft) SSE of bench mark 7178 D 1977, 20.06 m (65.8 ft) SW of a 0.61 m (2.0 ft) diameter palmetto tree, 6.77 m (22.2 ft) NE of a 0.21 m (0.7 ft) diameter bent oak tree, and 1.31 m (4.3 ft) east of a metal witness post. The bench mark is 6 cm (0.2 ft) above the ground, crimped to a galvanized steel rod driven 11.3 m (37 ft) to refusal, and encased in a 4-inch PVC pipe and a concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 8667178 PUBLICATION DATE: 05/23/2003 Name: POINT OF PINES, N. EDISTO R. SC NOAA Chart: 11522 Latitude: 32° 35.1' N ( 32.58500) USGS Quad: ROCKVILLE Longitude: 80° 13.7' W ( -80.22830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7178 D 1977 DESIGNATION: 866 7178 D TIDAL MONUMENTATION: Tidal Station disk VM#: 11316 AGENCY: National Ocean Survey (NOS) IDB PID#: CK2514 SETTING CLASSIFICATION: Galvanized steel rod OPUS PID: LATITUDE: 32° 35.1' N ( 32.58500) LONGITUDE: 80° 13.6' W ( -80.22670) The bench mark is a disk located along the beach just above the berm line, 28.29 m (92.8 ft) SE of bench mark 7178 E 1977, 26.82 m (88.0 ft) NE of the NW corner of an old tabby ruin, 13.20 m (43.3 ft) SE of a cluster of 3 live oak trees, 10.36 m (34.0 ft) north of a lone 0.61 m (2.0 ft) diameter palmetto tree and 1.22 m (4.0 ft) ENE of a metal witness post. The bench mark is 6 cm (0.2 ft) above the ground, crimped to a galvanized steel rod driven 11.3 m (37 ft) to refusal, and encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 8667178 PUBLICATION DATE: 05/23/2003 Name: POINT OF PINES, N. EDISTO R. SC NOAA Chart: 11522 Latitude: 32° 35.1' N ( 32.58500) USGS Quad: ROCKVILLE Longitude: 80° 13.7' W ( -80.22830) T I D A L D A T U M S Tidal datums at POINT OF PINES, N. EDISTO R. based on: LENGTH OF SERIES: 11 MONTHS TIME PERIOD: June 1978 - April 1979 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: MEAN HIGHER HIGH WATER MHHW = 1.897 MEAN HIGH WATER MHW = 1.787 North American Vertical Datum NAVD88 = 1.067 MEAN SEA LEVEL MSL = 0.996 MEAN TIDE LEVEL MTL = 0.925 MEAN LOW WATER MLW = 0.062 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 7178 E 1977 2.418 0.631 OAK NO 2 1933 2.811 1.024 OAK 1963 3.872 2.085 7178 C 1977 2.373 0.586 7178 D 1977 2.324 0.537
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 8667178 PUBLICATION DATE: 05/23/2003 Name: POINT OF PINES, N. EDISTO R. SC NOAA Chart: 11522 Latitude: 32° 35.1' N ( 32.58500) USGS Quad: ROCKVILLE Longitude: 80° 13.7' W ( -80.22830) 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.