U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8655875 PUBLICATION DATE: 05/31/2005 Name: SEA LEVEL, CORE SOUND NC NOAA Chart: 11550 Latitude: 34° 52.5' N ( 34.87500) USGS Quad: ATLANTIC Longitude: 76° 20.6' W ( -76.34330) To reach the benchmarks from the Post Office in Sea Level, NC, proceed east on US 70 for 0.64 km (0.4 miles) to Nelson Neck Road (SR 1373), then turn right and proceed south on Nelson Neck Road for 1.77 km (1.10 miles) to Taylor Seafood Company. The benchmarks are in the vicinity of Taylor Seafood Company. The tide station was located behind the warehouse on the wharf. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 5875 D 2004 MONUMENTATION: Tidal Station disk VM#: 17632 AGENCY: National Ocean Service (NOS) IDB PID#: DG7037 SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 34° 51.4' N ( 34.85670) LONGITUDE: 76° 23.2' W ( -76.38670) The primary bench mark is a disk located 45.15 m (148.1 ft) east of power pole number CK04, 7.25 m (23.8 ft) north of the centerline of Nelson Neck Road, and 0.75 m (2.5 ft) south of power pole number CK05. The bench mark is set 8 cm (0.3 ft) below grade, crimped to a stainless steel rod dirven 21.9 m (72 ft) to refusal, in a sleeve extending to a depth of 1.0 m (3 ft), and encased in a 5-inch PVC pipe with concrete kickblock and NOS logo cap. Note-This bench mark does not meet the specifications for a Class A rod mark. BENCH MARK STAMPING: 5875 A 2004 MONUMENTATION: Tidal Station disk VM#: 17633 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete dock OPUS PID#: DG7038 LATITUDE: 34° 51.4' N ( 34.85649) LONGITUDE: 76° 23.2' W ( -76.38746) The bench mark is disk set flush in a concrete dock located on the SW corner of Taylor Seafood Dock, 15.50 m (50.8 ft) south of the NW corner of the office building, 3.95 m (13.0 ft) SW of the SW corner of the office building, and 0.27 m (0.9 ft) east of the west side of the dock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8655875 PUBLICATION DATE: 05/31/2005 Name: SEA LEVEL, CORE SOUND NC NOAA Chart: 11550 Latitude: 34° 52.5' N ( 34.87500) USGS Quad: ATLANTIC Longitude: 76° 20.6' W ( -76.34330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5875 B 2004 MONUMENTATION: Tidal Station disk VM#: 17634 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete step OPUS PID: LATITUDE: 34° 51.4' N ( 34.85670) LONGITUDE: 76° 23.2' W ( -76.38670) The bench mark is a disk set in a concrete step located at the entrance door of the Mullet building, 22.51 m (73.8 ft) SW of the NW corner of the Freezer building, 16.26 m (53.4 ft) NNW of the NW corner of the Ice House building, 1.45 m (4.76 ft) NE of the NE corner of the Mullet building, and 0.30 m (1.0 ft) above the gound. BENCH MARK STAMPING: 5875 C 2004 MONUMENTATION: Tidal Station disk VM#: 17635 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete pad OPUS PID: LATITUDE: 34° 51.4' N ( 34.85670) LONGITUDE: 76° 23.2' W ( -76.38670) The bench mark is a disk set in a concrete pad located at the NE corner of the Freezer building, 29.72 m (97.5 ft) north of the SE corner of the Freezer building, 28.30 m (92.8 ft) SSW of the NW corner of the fence around the property, 22.01 m (72.2 ft) west of the centerline of Nelson Neck Road, and 0.9 m (3.0 ft) above ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8655875 PUBLICATION DATE: 05/31/2005 Name: SEA LEVEL, CORE SOUND NC NOAA Chart: 11550 Latitude: 34° 52.5' N ( 34.87500) USGS Quad: ATLANTIC Longitude: 76° 20.6' W ( -76.34330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5875 E 2004 MONUMENTATION: Tidal Station disk VM#: 17636 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete culvert OPUS PID: LATITUDE: 34° 51.4' N ( 34.85670) LONGITUDE: 76° 23.0' W ( -76.38330) The bench mark is set in the south end of a concrte culvert cover, 19.90 m (65.3 ft) east of the west edge of the road, 19.05 m (62.5 ft) SE of power pole number CK10, 8.12 m (26.6 ft) west of the east edge of the water, and 0.03 m (0.1 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8655875 PUBLICATION DATE: 05/31/2005 Name: SEA LEVEL, CORE SOUND NC NOAA Chart: 11550 Latitude: 34° 52.5' N ( 34.87500) USGS Quad: ATLANTIC Longitude: 76° 20.6' W ( -76.34330) T I D A L D A T U M S Tidal datums at SEA LEVEL, CORE SOUND based on: LENGTH OF SERIES: 2 MONTHS TIME PERIOD: May 2004 - June 2004 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8656483 BEAUFORT, DUKE MARINE LAB Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: North American Vertical Datum NAVD88 = 0.224 MEAN HIGHER HIGH WATER MHHW = 0.220 MEAN HIGH WATER MHW = 0.208 MEAN TIDE LEVEL MTL = 0.121 MEAN SEA LEVEL MSL = 0.120 MEAN LOW WATER MLW = 0.033 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 5875 D 2004 0.726 0.518 5875 A 2004 1.588 1.380 5875 B 2004 1.417 1.209 5875 C 2004 1.748 1.540 5875 E 2004 1.127 0.919
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8655875 PUBLICATION DATE: 05/31/2005 Name: SEA LEVEL, CORE SOUND NC NOAA Chart: 11550 Latitude: 34° 52.5' N ( 34.87500) USGS Quad: ATLANTIC Longitude: 76° 20.6' W ( -76.34330) 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.