U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8664878 PUBLICATION DATE: 07/26/2004 Name: OLD CAPERS LANDING, CAPERS ISLAND SC NOAA Chart: 11521 Latitude: 32° 52.2' N ( 32.87000) USGS Quad: CAPERS INLET Longitude: 79° 41.2' W ( -79.68670) To reach the tidal bench marks from Capers Inlet, proceed by boat north along Capers Creek for 3 km (2 nm) to Santee Pass, then proceed NE and east along Santee Pass for 2 km (1 nm) 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 located 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 DESIGNATION: 866 4878 TIDAL 1 OCL MONUMENTATION: Tidal Station disk VM#: 4109 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 32° 52.2' N ( 32.87000) LONGITUDE: 79° 41.2' W ( -79.68670) The primary bench mark is a disk located at the foot of the dock, 6.86 m (22.5 ft) east of the east corner of the dock, 5.64 m (18.5 ft) east of a 4x4-inch post with sign "Closed Area", and 0.58 m (1.9 ft) south of a witness post with sign. The bench mark is set 9 cm (0.3 ft) above grade, crimped to the top of a copper-clad steel rod driven an unspecified depth 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 2 of 5 Station ID: 8664878 PUBLICATION DATE: 07/26/2004 Name: OLD CAPERS LANDING, CAPERS ISLAND SC NOAA Chart: 11521 Latitude: 32° 52.2' N ( 32.87000) USGS Quad: CAPERS INLET Longitude: 79° 41.2' W ( -79.68670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: OCL NO 2 1975 DESIGNATION: 866 4878 TIDAL 2 OCL MONUMENTATION: Tidal Station disk VM#: 4110 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 32° 52.2' N ( 32.87000) LONGITUDE: 79° 41.2' W ( -79.68670) The bench mark is a disk located along an old palmetto log road in the marsh, 51.54 m (169.1 ft) SSE of bench mark OCL NO 1 1975, 1 m (4 ft) ENE of the centerline of the road, and 0.49 m (1.6 ft) WSW of a witness post with sign. The bench mark is 12 cm (0.4 ft) above grade, crimped to the top of a copper-clad steel rod driven an unspecified depth to refusal, and encased in a 5-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: OCL NO 3 1975 DESIGNATION: 866 4878 TIDAL 3 OCL MONUMENTATION: Tidal Station disk VM#: 4111 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 32° 52.2' N ( 32.87000) LONGITUDE: 79° 41.2' W ( -79.68670) The bench mark is a disk located near the edge of the woods, 95.92 m (314.7 ft) SSE of bench mark OCL NO 2 1975, 22.62 m (74.2 ft) south of power pole #141416, 2.96 m (9.7 ft) NE of a 0.61 m (2.0 ft) diameter palmetto tree, and 0.46 m (1.5 ft) NNE of a witness post with sign. The bench mark is set 6 cm (0.2 ft) above grade, crimped to the top of a copper-clad steel rod driven an unspecified depth to refusal, and encased in a 5-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: 8664878 PUBLICATION DATE: 07/26/2004 Name: OLD CAPERS LANDING, CAPERS ISLAND SC NOAA Chart: 11521 Latitude: 32° 52.2' N ( 32.87000) USGS Quad: CAPERS INLET Longitude: 79° 41.2' W ( -79.68670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: OCL NO 4 1975 DESIGNATION: 866 4878 TIDAL 4 OCL MONUMENTATION: Tidal Station disk VM#: 4112 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper pipe imbedded in concrete OPUS PID: LATITUDE: 32° 52.2' N ( 32.87000) LONGITUDE: 79° 41.2' W ( -79.68670) The bench mark is a disk brazed to a 1 m (4 ft) long, 2-inch copper pipe imbedded in concrete located in a palmetto grove along the path to the ocean, 15.70 m (51.5 ft) south of bench mark OCL NO 3 1975, 1.52 m (5.0 ft) NE of the foot path to the front beach, 1.16 m (3.8 ft) SW of a 0.61 m (2.0 ft) diameter palmetto tree, 1.07 m (3.5 ft) NW of a 0.61 m (2.0 ft) diameter palmetto tree, 0.67 m (2.2 ft) west of a witness post with sign, and 0.06 m (0.2 ft) above grade. BENCH MARK STAMPING: OCL NO 5 1975 DESIGNATION: 866 4878 TIDAL 5 OCL MONUMENTATION: Tidal Station disk VM#: 4113 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper pipe imbedded in concrete OPUS PID: LATITUDE: 32° 52.2' N ( 32.87000) LONGITUDE: 79° 41.2' W ( -79.68670) The bench mark is a disk brazed to a 1 m (4 ft) long, 2-inch copper pipe imbedded in concrete located along the path to the ocean, 25.30 m (83.0 ft) SE of bench mark OCL NO 4 1975, 4.15 m (13.6 ft) NNE of a 0.76 m (2.5 ft) diameter oak tree, 0.55 m (1.8 ft) SW of a tin tool shed/garage building, 0.40 m (1.3 ft) NW of a witness post with sign, and 0.12 m (0.4 ft) above grade.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8664878 PUBLICATION DATE: 07/26/2004 Name: OLD CAPERS LANDING, CAPERS ISLAND SC NOAA Chart: 11521 Latitude: 32° 52.2' N ( 32.87000) USGS Quad: CAPERS INLET Longitude: 79° 41.2' W ( -79.68670) T I D A L D A T U M S Tidal datums at OLD CAPERS LANDING, CAPERS ISLAND based on: LENGTH OF SERIES: 1 MONTH TIME PERIOD: October 1975 - October 1975 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8664941 SOUTH CAPERS ISLAND, CAPERS CREEK Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 1.670 MEAN HIGH WATER MHW = 1.548 MEAN SEA LEVEL MSL = 0.815 MEAN TIDE LEVEL MTL = 0.797 MEAN LOW WATER MLW = 0.047 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW OCL NO 1 1975 1.987 0.439 OCL NO 2 1975 1.709 0.161 OCL NO 3 1975 1.876 0.328 OCL NO 4 1975 2.496 0.948 OCL NO 5 1975 2.359 0.811
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8664878 PUBLICATION DATE: 07/26/2004 Name: OLD CAPERS LANDING, CAPERS ISLAND SC NOAA Chart: 11521 Latitude: 32° 52.2' N ( 32.87000) USGS Quad: CAPERS INLET Longitude: 79° 41.2' W ( -79.68670) 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.