U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8678124 PUBLICATION DATE: 07/11/2012 Name: RACCOON KEY SPIT GA NOAA Chart: 11504 Latitude: 31° 0.9' N ( 31.01481) USGS Quad: JEKYLL ISLAND Longitude: 81° 27.4' W ( -81.45597) From I95 through Georgia take exit 29 for US-17/US-82/GA-520 toward Brunswick/Waycross/S Georgia Pkwy for .48 km (0.3mi). Keep right at the fork, follow signs for US-17 and merge onto GA-25 N/GA-520 E/U.S. 17B N for 8.69 km (5.4mi). Slight right onto GA-520 E/Jekyll Island Rd Continue to follow GA-520 E for 10.29km (6.4mi). Turn right onto S Riverview Dr for .96 km (0.6mi). Turn right on dirt road and follow around pond until you reach boat ramp. Proceed by boat southwest on ICW for 4.26 km (2.64 mi) to a southerly cut, proceed south on cut for 0.34 km (0.21 mi) to NOAA/NOS Tide Station 867 8124. The station is mounted to unmarked pylon and bench marks are onshore west of station. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 867 8124 A DESIGNATION: 867 8124 A MONUMENTATION: Bench Mark disk VM#: 20371 AGENCY: NOS IDB PID#: SETTING CLASSIFICATION: OPUS PID#: BBCR11 LATITUDE: 31° 0.9' N ( 31.01489) LONGITUDE: 81° 27.4' W ( -81.45642) The primary bench mark is a flange-encased metal rod located 20.2 km (12.6 mi) NE of Harrietts Bluff, 15.3 km (9.5 mi) south-southeast of Brunswick, 6.8 km (4.2 mi) east of dover bluff, 61.4 m (201.4 ft) NNW of bench mark 867 8124 B, 47.8 m (156.8 ft) W of NOAA/NOS tide station 867 8124, 29.3 m (96.1 ft) north-northeast of the northeastern edge of the woods, 0.6 m (2.0 ft) east of a witness post. The bench mark is set 0.3 m (1.0 ft) above the ground. The datum point is set 0.3 m (1.0 ft) above the ground, being the top of a stainless steel rod driven 11.0 m (36.1 ft) to refusal, and encased in a 5-inch logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8678124 PUBLICATION DATE: 07/11/2012 Name: RACCOON KEY SPIT GA NOAA Chart: 11504 Latitude: 31° 0.9' N ( 31.01481) USGS Quad: JEKYLL ISLAND Longitude: 81° 27.4' W ( -81.45597) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 867 8124 B DESIGNATION: 867 8124 B MONUMENTATION: Bench Mark disk VM#: 20372 AGENCY: NOS IDB PID#: SETTING CLASSIFICATION: OPUS PID: LATITUDE: 31° 0.9' N ( 31.01436) LONGITUDE: 81° 27.4' W ( -81.45617) The bench mark is a flange-encased metal rod located 20.2 km (12.6 mi) NE of Harrietts Bluff, 15.4 km (9.6 mi) SSE of Brunswick, 6.8 km (4.2 mi) east of Dover Bluff, 64.0 m (210.0 ft) NNW of bench mark 867 8124 C, 61.4 m (201.4 ft) SSE of bench mark 867 8124 A, 54.7 m (179.5 ft) SW of NOAA/NOS tide station 867 8124, 12.6 m (41.3 ft) NNE of the eastern edge of the woods, 0.6 m (2.0 ft) east of a witness post. The bench mark is set 15 cm (0.5 ft) above the ground, being the top of a stainless steel rod driven 11.0 m (36.1 ft) to refusal, and encased in a 5-inch logo cap. BENCH MARK STAMPING: 867 8124 C DESIGNATION: 867 8124 C MONUMENTATION: Bench Mark disk VM#: 20373 AGENCY: NOS IDB PID#: SETTING CLASSIFICATION: OPUS PID: LATITUDE: 31° 0.8' N ( 31.01383) LONGITUDE: 81° 27.4' W ( -81.45594) The bench mark is a flange-encased metal rod located 20.1 km (12.5 mi) NE of Harrietts Bluff, 15.5 km (9.6 mi) SSE of Brunswick, 6.8 km (4.2 mi) east of Dover Bluff, 92.70 m (304.13 ft) SW of NOAA/NOS tide station 867 8124, 64.0 m (210.0 ft) SSE of bench mark 867 8124 B, 62.3 m (204.4 ft) NNW of bench mark 867 8124 D, 11.9 m (39.0 ft) ENE of the eastern edge of the woods, 0.6 m (2.0 ft) E of a witness post. The bench mark is set 15.0 cm (0.5 ft) above the ground, being the top of a stainless steel rod driven 11.0 m (36.1 ft) to refusal, and encased in a 5-inch logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8678124 PUBLICATION DATE: 07/11/2012 Name: RACCOON KEY SPIT GA NOAA Chart: 11504 Latitude: 31° 0.9' N ( 31.01481) USGS Quad: JEKYLL ISLAND Longitude: 81° 27.4' W ( -81.45597) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 867 8124 D DESIGNATION: 867 8124 D MONUMENTATION: Bench Mark disk VM#: 20374 AGENCY: NOS IDB PID#: SETTING CLASSIFICATION: OPUS PID: LATITUDE: 31° 0.8' N ( 31.01331) LONGITUDE: 81° 27.3' W ( -81.45569) The bench mark is a flange-encased metal rod located 20.1 km (12.5 mi) NE of Harrietts Bluff, 15.5 km (9.6 mi) SSE of Brunswick, 6.8 km (4.2 mi) east of Dover Bluff, 92.70 m (304.13 ft) SW of NOAA/NOS tide station 867 8124, 64.0 m (210.0 ft) SSE of bench mark 867 8124 B, 62.3 m (204.4 ft) NNW of bench mark 867 8124 D, 11.9 m (39.0 ft) ENE of the eastern edge of the woods, 0.6 m (2.0 ft) E of a witness post. The bench mark is set 15.0 cm (0.5 ft) above the ground, being the top of a stainless steel rod driven 11.0 m (36.1 ft) to refusal, and encased in a 5-inch logo cap. BENCH MARK STAMPING: 867 8124 E DESIGNATION: 867 8124 E MONUMENTATION: Bench Mark disk VM#: 20375 AGENCY: NOS IDB PID#: SETTING CLASSIFICATION: OPUS PID: LATITUDE: 31° 0.8' N ( 31.01264) LONGITUDE: 81° 27.3' W ( -81.45544) The bench mark is a flange-encased metal rod located 20.0 km (12.4 mi) NE of Harrietts Bluff, 15.6 km (9.7 mi) SSE of Brunswick, 6.9 km (4.3 mi) E of Dover Bluff, 222.90 m (731.28 ft) SW of NOAA/NOS tide station 867 8124, 77.5 m (254.3 ft) SSW of bench mark 867 8124 D, 22.8 m (74.8 ft) NW of the edge of the highwater shoreline, 13.5 m (44.3 ft) ENE of the eastern edge of the woods, 0.6 m (2.0 ft) east of a witness post. The bench mark is set 15.0 cm (0.5 ft) above the ground, being the top of a stainless steel rod driven 11.0 m (36.1 ft) to refusal, and encased in a 5-inch logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8678124 PUBLICATION DATE: 07/11/2012 Name: RACCOON KEY SPIT GA NOAA Chart: 11504 Latitude: 31° 0.9' N ( 31.01481) USGS Quad: JEKYLL ISLAND Longitude: 81° 27.4' W ( -81.45597) T I D A L D A T U M S Tidal datums at RACCOON KEY SPIT based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: February 2012 - April 2012 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: MEAN HIGHER HIGH WATER MHHW = 2.172 MEAN HIGH WATER MHW = 2.063 MEAN SEA LEVEL MSL = 1.084 MEAN TIDE LEVEL MTL = 1.063 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 867 8124 A 2.478 0.415 867 8124 B 2.547 0.484 867 8124 C 2.553 0.490 867 8124 D 2.413 0.350 867 8124 E 2.316 0.253
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8678124 PUBLICATION DATE: 07/11/2012 Name: RACCOON KEY SPIT GA NOAA Chart: 11504 Latitude: 31° 0.9' N ( 31.01481) USGS Quad: JEKYLL ISLAND Longitude: 81° 27.4' W ( -81.45597) 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.