U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 PUBLICATION DATE: 11/13/1990 Station ID: 8664878 SUPERCEDED DATE: 04/21/2003 Name: OLD CAPERS BACK LANDING, CAPERS ISLAND, SANTEE PAS SOUTH CAROLINA NOAA Chart: 11521 Latitude: 32° 52.2' N USGS Quad: CAPERS INLET4 Longitude: 79° 41.2' W To reach the tidal bench marks from Capers Inlet, proceed north along Capers Creek by boat for 2 miles (3 km) to Santee Pass, then NE and east along Santee Pass for 1 mile (2 km) to the 90 degree bend in the river. The bench marks are on Capers Island, adjacent to a road/path leading from the landing to the ocean. The tide gage and staff were on the end of a small dock. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: OCL NO 1 1975 MONUMENTATION: Survey Disk VM#: 4109 AGENCY: PID: SETTING CLASSIFICATION: Copper-clad Steel Rod The bench mark is set at the foot of the dock, 22.5 feet (6.9 m) east of the east corner of the dock, 18.5 feet (5.6 m) east of a 4x4-inch post with sign Closed Area, and 1.9 feet (0.6 m) south of a witness post with sign. The bench mark is 0.3 foot (0.1 m) above grade, crimped to a copper-clad steel rod driven an unspecified depth to refusal, and encased in a 4-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: OCL NO 2 1975 MONUMENTATION: Survey Disk VM#: 4110 AGENCY: PID: SETTING CLASSIFICATION: Copper-clad Steel Rod The bench mark is set along an old palmetto log road in the marsh, 169.1 feet (51.5 m) SSE of Bench Mark OCL NO 1 1975, 4 feet (1 m) ENE of the centerline of the palmetto road, and 1.6 feet (0.5 m) WSW of a witness post with sign. The bench mark is 0.3 foot (0.1 m) above grade, crimped to a copper-clad steel rod driven an unspecified depth 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and Atmospheric Administration National Ocean Service Page 2 of 5 PUBLICATION DATE: 11/13/1990 Station ID: 8664878 SUPERCEDED DATE: 04/21/2003 Name: OLD CAPERS BACK LANDING, CAPERS ISLAND, SANTEE PAS SOUTH CAROLINA NOAA Chart: 11521 Latitude: 32° 52.2' N USGS Quad: CAPERS INLET4 Longitude: 79° 41.2' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: OCL NO 3 1975 MONUMENTATION: Survey Disk VM#: 4111 AGENCY: PID: SETTING CLASSIFICATION: Copper-clad Steel Rod The bench mark is set near the edge of the woods, 314.7 feet (95.9 m) SSE of Bench Mark OCL NO 2 1975, 74.2 feet (22.6 m) south of power pole #141416, 9.7 feet (3.0 m) NE of a 2.0-foot (0.6 m) diameter palmetto tree, and 1.5 feet (0.5 m) NNE of a witness post with sign. The bench mark is 0.2 foot (0.1 m) above grade, crimped to a copper-clad steel rod driven an unspecified depth to refusal, and encased in a 4-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: OCL NO 4 1975 MONUMENTATION: Survey Disk VM#: 4112 AGENCY: PID: SETTING CLASSIFICATION: Shallow-set Pipe The bench mark is set in a palmetto grove along the path to the ocean, 51.5 feet (15.7 m) south of Bench Mark OCL NO 3 1975, 5 feet (1.5 m) NE of the path, 3.8 feet (1.2 m) SW of a 2.0-foot (0.6 m) diameter palmetto tree, 3.5 feet (1.1 m) NW of a 2.0-foot (0.6 m) diameter palmetto tree, and 2.2 feet (0.7 m) west of a witness post with sign. The bench mark is 0.2 foot (0.1 m) above grade, brazed to a 4-foot (1 m) long, 2-inch copper pipe encased in concrete.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 PUBLICATION DATE: 11/13/1990 Station ID: 8664878 SUPERCEDED DATE: 04/21/2003 Name: OLD CAPERS BACK LANDING, CAPERS ISLAND, SANTEE PAS SOUTH CAROLINA NOAA Chart: 11521 Latitude: 32° 52.2' N USGS Quad: CAPERS INLET4 Longitude: 79° 41.2' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: OCL NO 5 1975 MONUMENTATION: Survey Disk VM#: 4113 AGENCY: PID: SETTING CLASSIFICATION: Shallow-set Pipe The bench mark is set along the path to the ocean, 83.0 feet (25.3 m) SE of Bench Mark OCL NO 4 1975, 13.6 feet (4.1 m) NNE of a 2.5-foot (0.8 m) diameter oak tree, 1.8 feet (0.5 m) SW of a tin shed/garage building, and 1.3 feet (0.4 m) NW of a witness post with sign. The bench mark is 0.4 foot (0.1 m) above grade, brazed to a 4-foot (1 m) long, 2-inch copper pipe encased in concrete.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 PUBLICATION DATE: 11/13/1990 Station ID: 8664878 SUPERCEDED DATE: 04/21/2003 Name: OLD CAPERS BACK LANDING, CAPERS ISLAND, SANTEE PAS SOUTH CAROLINA NOAA Chart: 11521 Latitude: 32° 52.2' N USGS Quad: CAPERS INLET4 Longitude: 79° 41.2' W T I D A L D A T U M S Tidal datums at OLD CAPERS BACK LANDING, CAPERS ISLAND, SANTEE PAS based on: LENGTH OF SERIES: 1 MONTH TIME PERIOD: OCTOBER 1975 TIDAL EPOCH: 1960-1978 CONTROL TIDE STATION: 8664941 CAPERS CREEK Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET: HIGHEST OBSERVED WATER LEVEL (10/05/1975) = 7.49 MEAN HIGHER HIGH WATER MHHW = 5.55 MEAN HIGH WATER MHW = 5.16 MEAN TIDE LEVEL MTL = 2.67 MEAN LOW WATER MLW = 0.18 MEAN LOWER LOW WATER MLLW = 0.00 LOWEST OBSERVED WATER LEVEL (10/07/1975) = -0.12 Bench Mark Elevation Information In FEET above: Stamping or Designation MLLW MHW OCL NO 1 1975 6.80 1.64 OCL NO 2 1975 5.89 0.73 OCL NO 3 1975 6.44 1.28 OCL NO 4 1975 8.47 3.31 OCL NO 5 1975 8.02 2.86
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 PUBLICATION DATE: 11/13/1990 Station ID: 8664878 SUPERCEDED DATE: 04/21/2003 Name: OLD CAPERS BACK LANDING, CAPERS ISLAND, SANTEE PAS SOUTH CAROLINA NOAA Chart: 11521 Latitude: 32° 52.2' N USGS Quad: CAPERS INLET4 Longitude: 79° 41.2' W 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 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.