Bench Mark Sheet for 8679758, DUNGENESS, SEACAMP DOCK GA
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Published Bench Mark Sheet for 8679758 DUNGENESS, SEACAMP DOCK GA
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8679758 PUBLICATION DATE: 05/09/2011 Name: DUNGENESS, SEACAMP DOCK GA NOAA Chart: 11503 Latitude: 30° 45.8' N ( 30.76330) USGS Quad: CUMBERLAND ISLAND SOUTH Longitude: 81° 28.3' W ( -81.47170) To reach the tidal bench marks from Greyfield on North-South Road on Cumberland Island South proceed 1.6 km (1 mi) south to hard improved road, then west on improved road to the Cumberland Island National Seashore Park ranger station. The bench marks are located in the vicinity of the park ranger station. The tide gage and staff were located on the seacamp dock SW of the ranger station. T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 8679758 PUBLICATION DATE: 05/09/2011 Name: DUNGENESS, SEACAMP DOCK GA NOAA Chart: 11503 Latitude: 30° 45.8' N ( 30.76330) USGS Quad: CUMBERLAND ISLAND SOUTH Longitude: 81° 28.3' W ( -81.47170) T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NIGHTINGALE 2 1933 DESIGNATION: NIGHTINGALE 2 MONUMENTATION: Triangulation Station disk VM#: 4949 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: BC1815 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 45.9' N ( 30.76500) LONGITUDE: 81° 28.2' W ( -81.47000) The primary bench mark is a disk set in the top of a 1-foot square concrete monument, 12 m (41 ft) west of a chimney on the west side of the ranger station at Cumberland Island, 6 m (20 ft) east of a wooden bulkhead, and 3 m (9 ft) NW from a large oak tree along the bank. BENCH MARK STAMPING: 9758 B 1978 DESIGNATION: 867 9758 B TIDAL MONUMENTATION: Tidal Station disk VM#: 4950 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Unspecified deep rod OPUS PID: LATITUDE: 30° 45.8' N ( 30.76330) LONGITUDE: 81° 28.3' W ( -81.47170) The bench mark is a disk located at the NW corner of the ranger offices, 31 m (103 ft) SE of bench mark 9758 C 1978, 16.15 m (53.0 ft) ENE from bench mark Nightengale 2 1933, and 0.61 m (2.0 ft) NW of a wooden power pole (antenna mast). The bench mark is set flush with ground, crimped the to the top of a rod driven 1.2 m (4 ft).
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 8679758 PUBLICATION DATE: 05/09/2011 Name: DUNGENESS, SEACAMP DOCK GA NOAA Chart: 11503 Latitude: 30° 45.8' N ( 30.76330) USGS Quad: CUMBERLAND ISLAND SOUTH Longitude: 81° 28.3' W ( -81.47170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9758 C 1978 DESIGNATION: 867 9758 C TIDAL MONUMENTATION: Tidal Station disk VM#: 4951 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Unspecified deep rod OPUS PID: LATITUDE: 30° 45.8' N ( 30.76330) LONGITUDE: 81° 28.3' W ( -81.47170) The bench mark is a disk located behind the ranger offices at Cumberland Island in the NW corner of the yard area, 29.50 m (96.8 ft) west from bench mark 9758 D 1978, and 1 m (3 ft) east of a line of bush palms along the bank. The bench mark is set flush with the ground, and crimped to the top of a rod driven 1.2 m (4 ft). BENCH MARK STAMPING: 9758 D 1978 DESIGNATION: 867 9758 D TIDAL MONUMENTATION: Tidal Station disk VM#: 4952 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Unspecified deep rod OPUS PID: LATITUDE: 30° 45.8' N ( 30.76330) LONGITUDE: 81° 28.3' W ( -81.47170) The bench mark is a disk set betwen two large live oak trees behind the ranger offices at Cumberland Island, 29.50 m (96.8 ft) west of bench mark 9758 E 1978, and 28 m (92 ft) north of northernmost side of ranger building at the air conditioning unit heat pump. The bench mark is set flush with the ground, and crimped the top of a rod driven 1.2 m (4 ft).
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 8679758 PUBLICATION DATE: 05/09/2011 Name: DUNGENESS, SEACAMP DOCK GA NOAA Chart: 11503 Latitude: 30° 45.8' N ( 30.76330) USGS Quad: CUMBERLAND ISLAND SOUTH Longitude: 81° 28.3' W ( -81.47170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9758 E 1978 DESIGNATION: 867 9758 E TIDAL MONUMENTATION: Tidal Station disk VM#: 4953 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Unspecified deep rod OPUS PID: LATITUDE: 30° 45.8' N ( 30.76330) LONGITUDE: 81° 28.3' W ( -81.47170) The bench mark is a disk located behind the ranger offices at Cumberland Island, 12 m (38 ft) NE of a small aluminum storage shelter, and 7 m (22 ft) NE of the centerline of a small driveway leading to the rear of the building. The bench mark is set flush with the ground, and crimped to the top of a rod driven 1.2 m (4 ft).
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 8679758 PUBLICATION DATE: 05/09/2011 Name: DUNGENESS, SEACAMP DOCK GA NOAA Chart: 11503 Latitude: 30° 45.8' N ( 30.76330) USGS Quad: CUMBERLAND ISLAND SOUTH Longitude: 81° 28.3' W ( -81.47170) T I D A L D A T U M S Tidal datums at DUNGENESS, SEACAMP DOCK based on: LENGTH OF SERIES: 1 YEAR TIME PERIOD: January 1979 - December 1979 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8720030 FERNANDINA BEACH, AMELIA RIVER Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (09/04/1979) = 2.694 MEAN HIGHER HIGH WATER MHHW = 2.067 MEAN HIGH WATER MHW = 1.959 MEAN SEA LEVEL MSL = 1.044 MEAN TIDE LEVEL MTL = 1.010 MEAN LOW WATER MLW = 0.060 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (02/26/1979) = -0.826 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW NIGHTINGALE 2 1933 4.681 2.722 9758 B 1978 4.826 2.867 9758 C 1978 4.548 2.589 9758 D 1978 4.768 2.809 9758 E 1978 5.028 3.069
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 8679758 PUBLICATION DATE: 05/09/2011 Name: DUNGENESS, SEACAMP DOCK GA NOAA Chart: 11503 Latitude: 30° 45.8' N ( 30.76330) USGS Quad: CUMBERLAND ISLAND SOUTH Longitude: 81° 28.3' W ( -81.47170) 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.