U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8664545 PUBLICATION DATE: 06/27/2018 Name: CAINHOY, WANDO RIVER SC NOAA Chart: 11524 Latitude: 32° 55.6' N ( 32.92670) USGS Quad: CAINHOY Longitude: 79° 49.8' W ( -79.83000) To reach the tidal bench marks fron the intersection of U.S. Highway 17 and State Highway 41, proceed NW on State Highway 41 for 8.9 km (5.5 mi) to the junction with Clements Ferry Road in Cainhoy, then turn left and proceed east on Clements Ferry Road for 0.8 km (0.5 mi) to Fogarty Lane, then turn left and proceed south on Fogarty Lane for 0.5 km (0.3 mi) to the in Wando. The bench marks are along the shore. The tide gage and staff were on the pier behind the Cox residence. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 4545 A 1976 DESIGNATION: 866 4545 A TIDAL MONUMENTATION: Tidal Station disk VM#: 4061 AGENCY: National Ocean Survey (NOS) IDB PID#: CJ0501 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 32° 55.7' N ( 32.92830) LONGITUDE: 79° 49.8' W ( -79.83000) The primary bench mark is a disk located at the inshore end of the pier behind the Cox residence, 10.15 m (33.3 ft) NNE of a power pole on the pier with spot lights on it, 9.78 m (32.1 ft) NNE of the end of the pier, 8.69 m (28.5 ft) east of a 0.61 m (2.0 ft) diameter pecan tree, 6.34 m (20.8 ft) SE of a 0.46 m (1.5 ft) diameter magnolia tree, 4.36 m (14.3 ft) west of the edge of the marsh, and 0.98 m (3.2 ft) west of a witness post with sign. The bench mark is set 0.55 m (1.8 ft) below the ground, crimped to the top of a copper-clad steel rod driven 6.7 m (22 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: 8664545 PUBLICATION DATE: 06/27/2018 Name: CAINHOY, WANDO RIVER SC NOAA Chart: 11524 Latitude: 32° 55.6' N ( 32.92670) USGS Quad: CAINHOY Longitude: 79° 49.8' W ( -79.83000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4545 C 1976 DESIGNATION: 866 4545 C TIDAL MONUMENTATION: Tidal Station disk VM#: 4062 AGENCY: National Ocean Survey (NOS) IDB PID#: CJ0504 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 32° 55.7' N ( 32.92830) LONGITUDE: 79° 49.8' W ( -79.83000) The bench mark is a disk located about 91 m (300 ft) south of the Post Office, 15 m (49 ft) ESE of the SE corner of the porch of a one-story wood frome house with brick foundation, 9.94 m (32.6 ft) SE of a 0.46 m (1.5 ft) diameter pecan tree in the yard of a private residence, 3.57 m (11.7 ft) west of the center- line of State Road S-8-26, 1.52 m (5.0 ft) north of the corner post of a wire link fence, and 1.04 m (3.4 ft) north of power pole #177455. The bench mark is level with the ground, crimped to the top of a copper-clad steel rod driven 9.8 m (32 ft) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: 4545 D 1976 DESIGNATION: 866 4545 D TIDAL MONUMENTATION: Tidal Station disk VM#: 4063 AGENCY: National Ocean Survey (NOS) IDB PID#: CJ0502 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 32° 55.7' N ( 32.92830) LONGITUDE: 79° 49.8' W ( -79.83000) The bench mark is a disk located at the south end of Fogarty Lane, about 229 m (750 ft) south of the Post Office, 46 m (150 ft) west of the end of State Road S-8-26, 4.30 m (14.1 ft) NW of a 0.76 m (2.5 ft) diameter oak tree, 2.41 m (7.9 ft) south of the centerline of a dirt road, and 0.88 m (2.9 ft) SW of power pole #188980. The bench mark is level with the ground, crimped to the top of a copper-clad steel rod driven 8.2 m (27 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: 8664545 PUBLICATION DATE: 06/27/2018 Name: CAINHOY, WANDO RIVER SC NOAA Chart: 11524 Latitude: 32° 55.6' N ( 32.92670) USGS Quad: CAINHOY Longitude: 79° 49.8' W ( -79.83000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4545 E 1982 DESIGNATION: 866 4545 E 1982 MONUMENTATION: Tidal Station disk VM#: 4064 AGENCY: National Ocean Service (NOS) IDB PID#: CJ0500 SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 32° 55.7' N ( 32.92830) LONGITUDE: 79° 49.9' W ( -79.83170) The bench mark is a disk located at a power pole across the road from the Post Office, 38.22 m (125.4 ft) ENE of the NE corner of the Post Office, 33 m (108 ft) NNE of power pole #34344, 27.04 m (88.7 ft) SE of Fogarty Lane, 0.76 m (2.5 ft) south of power pole #34306, and 0.3 m (1.0 ft) west of a witness post with sign. The bench mark is level with the ground, crimped to the top of a stainless steel rod driven 9.8 m (32 ft) 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 4 of 5 Station ID: 8664545 PUBLICATION DATE: 06/27/2018 Name: CAINHOY, WANDO RIVER SC NOAA Chart: 11524 Latitude: 32° 55.6' N ( 32.92670) USGS Quad: CAINHOY Longitude: 79° 49.8' W ( -79.83000) T I D A L D A T U M S Tidal datums at CAINHOY, WANDO RIVER based on: LENGTH OF SERIES: 2 YEARS TIME PERIOD: 5/1/1988 - 4/30/1989 ; 5/1/1997 - 4/30/1998 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 (02/27/1998) = 2.525 MEAN HIGHER HIGH WATER MHHW = 1.998 MEAN HIGH WATER MHW = 1.893 North American Vertical Datum NAVD88 = 1.092 MEAN SEA LEVEL MSL = 1.079 MEAN TIDE LEVEL MTL = 0.976 MEAN LOW WATER MLW = 0.059 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (04/07/1989) = -0.870 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 4545 A 1976 2.501 0.608 4545 C 1976 5.360 3.467 4545 D 1976 4.784 2.891 4545 E 1982 5.579 3.686
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8664545 PUBLICATION DATE: 06/27/2018 Name: CAINHOY, WANDO RIVER SC NOAA Chart: 11524 Latitude: 32° 55.6' N ( 32.92670) USGS Quad: CAINHOY Longitude: 79° 49.8' W ( -79.83000) 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.