U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8670424 PUBLICATION DATE: 04/21/2003 Name: PORT WENTWORTH GA NOAA Chart: 11512 Latitude: 32° 8.6' N ( 32.14330) USGS Quad: PORT WENTWORTH Longitude: 81° 8.5' W ( -81.14170) To reach the tidal bench marks from the end of interstate 516 and Route 21 in Savannah, GA. Proceed north on State Highway 21 for 6.6 km (4.1 mi), turn right on Crossgate Drive, proceed east on Crossgate Drive for 1.4 km (0.9 mi), turn right on State Highway 17/25, proceed south on State Highway 17/25 for 0.8 km (0.5 mi), turn left on to Oxnard Drive also into Dixie Crystals Sugar Refinery, proceed east on Oxnard Drive for 0.72 km (0.45 mi) to the front gate of the Dixie Crystals Sugar Refinery. The tidal bench marks are on the Dixie Crystals Sugar Refinery property. The tide gage was located on the south side of the plant pier on the Savannah River. Note: Contact plant security at main gate or Engineering Department at 912-964-1361 for access to the bench marks. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: A 3 1943 DESIGNATION: A 3 MONUMENTATION: Bolt VM#: 16682 AGENCY: US Army Corps of Engineers (USE) IDB PID#: CK0429 SETTING CLASSIFICATION: Building foundation OPUS PID: LATITUDE: 32° 8.6' N ( 32.14330) LONGITUDE: 81° 8.8' W ( -81.14670) The primary bench mark is the top of a 1-inch hexagonal brass bolt in the top of the projection of the concrete foundation of a 4-story brick building at the refinery, at a slight inset of the brick wall, about 0.05 mi. (0.08 km) east of the main entrance gate, 1.58 m (5.2 ft) west of NE corner of the building, 1.50 m (4.9 ft) east of east side of a door, 0.06 m (0.20 ft) north of north face of building, and about level with ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 8670424 PUBLICATION DATE: 04/21/2003 Name: PORT WENTWORTH GA NOAA Chart: 11512 Latitude: 32° 8.6' N ( 32.14330) USGS Quad: PORT WENTWORTH Longitude: 81° 8.5' W ( -81.14170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: A 3 A 1943 DESIGNATION: A 3 A MONUMENTATION: Survey disk VM#: 16683 AGENCY: US Army Corps of Engineers (USE) IDB PID#: CK0428 SETTING CLASSIFICATION: Building wall OPUS PID: LATITUDE: 32° 8.6' N ( 32.14330) LONGITUDE: 81° 8.6' W ( -81.14330) The bench mark is a disk set vertically in the east face of the concrete foundation of a 6 m (20 ft) high tin building housing the bag station, about 0.15 mi. (0.24 km) east and south along streets through the refinery near the SE corner of the plant, about 73 m (240 ft) west of a loading dock on the Savannah River, 0.18 m (0.6 ft) norht of the SE corner of the foundation, and about level with a concrete ramp which parallels the south side of building and leads to the loading dock. BENCH MARK STAMPING: NO 1 1934 DESIGNATION: 867 0424 TIDAL 1 MONUMENTATION: Tidal Station disk VM#: 16684 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: CK0427 SETTING CLASSIFICATION: Ramp OPUS PID: LATITUDE: 32° 8.6' N ( 32.14330) LONGITUDE: 81° 8.6' W ( -81.14330) The bench mark is a disk set in the top of a concrete ramp on the south side of warehouse No. 1, about 0.15 mile (0.24 km) east and south along streets through the refinery, at the south side of the refinery. Note - a spur railroad track parallels this building and leads to loading dock on Savannah River.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 8670424 PUBLICATION DATE: 04/21/2003 Name: PORT WENTWORTH GA NOAA Chart: 11512 Latitude: 32° 8.6' N ( 32.14330) USGS Quad: PORT WENTWORTH Longitude: 81° 8.5' W ( -81.14170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: X 212 1955 DESIGNATION: X 212 MONUMENTATION: Bench Mark disk VM#: 16685 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: CK0430 SETTING CLASSIFICATION: Building wall OPUS PID: LATITUDE: 32° 8.6' N ( 32.14330) LONGITUDE: 81° 8.8' W ( -81.14670) The bench mark is a disk set vertically in the north face of the concrete foundation of a 8 m (25 ft) high concrete, brick, and tin building (boiler and power building), inside a metal addition to the original building in the area of an emergency generator, about 18 m (60 ft) SE of the main entrance gate, 0.48 m (1.6 ft) east of the NW corner of the building, and 0.39 m (1.3 ft) above ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 8670424 PUBLICATION DATE: 04/21/2003 Name: PORT WENTWORTH GA NOAA Chart: 11512 Latitude: 32° 8.6' N ( 32.14330) USGS Quad: PORT WENTWORTH Longitude: 81° 8.5' W ( -81.14170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: X 212 RESET 1984 DESIGNATION: X 212 RESET MONUMENTATION: Vertical Control disk VM#: 16686 AGENCY: National Geodetic Survey (NGS) IDB PID#: CK6223 SETTING CLASSIFICATION: Sidewalk OPUS PID: LATITUDE: 32° 8.6' N ( 32.14330) LONGITUDE: 81° 8.8' W ( -81.14670) The bench mark is a disk set in the sidewalk to the left of the refinery entrance gate, at the SW corner of a first aid station, 1.90 m (6.23 ft) SW of a brick column, and 0.24 m (0.79 ft) east of the end of the sidewalk.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 8670424 PUBLICATION DATE: 04/21/2003 Name: PORT WENTWORTH GA NOAA Chart: 11512 Latitude: 32° 8.6' N ( 32.14330) USGS Quad: PORT WENTWORTH Longitude: 81° 8.5' W ( -81.14170) T I D A L D A T U M S Tidal datums at PORT WENTWORTH based on: LENGTH OF SERIES: 3 Months TIME PERIOD: May 2002 - July 2002 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8670870 FORT PULASKI, SAVANNAH RIVER Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 2.635 MEAN HIGH WATER MHW = 2.543 MEAN SEA LEVEL MSL = 1.424 North American Vertical Datum NAVD88 = 1.397 MEAN TIDE LEVEL MTL = 1.303 MEAN LOW WATER MLW = 0.063 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW A 3 1943 5.647 3.104 A 3 A 1943 4.915 2.372 NO 1 1934 5.695 3.152 X 212 1955 5.954 3.411 X 212 RESET 1984 6.069 3.526
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 8670424 PUBLICATION DATE: 04/21/2003 Name: PORT WENTWORTH GA NOAA Chart: 11512 Latitude: 32° 8.6' N ( 32.14330) USGS Quad: PORT WENTWORTH Longitude: 81° 8.5' W ( -81.14170) 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.