U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 10 Station ID: 8722414 PUBLICATION DATE: 03/13/2009 Name: GOMEZ FL NOAA Chart: 11474 Latitude: 27° 5.6' N ( 27.09330) USGS Quad: GOMEZ Longitude: 80° 8.2' W ( -80.13670) To reach the tidal bench marks from the intersection of State Highway A1A (SE Dixie Highway) and State Road 707 (SE Bridge Road) in Hobe Sound, proceed 0.2 km (0.1 mi) easterly on State Road 707 to SE Gomez Avenue, then turn left and proceed north on SE Gomez Avenue for 3.9 km (2.4 mi) to Coconut Street, then turn right and proceed east on Coconut Street for 0.5 km (0.3 mi) to its end. The bench marks are located on the concrete sea wall. The tide gage and staff were located east of the bench marks on day beacon #24 on the Intracoastal Waterway. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NO 3 1972 DESIGNATION: 872 2414 TIDAL 3 MONUMENTATION: Tidal Station disk VM#: 5473 AGENCY: National Ocean Survey (NOS) IDB PID#: AF6973 SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 27° 5.6' N ( 27.09330) LONGITUDE: 80° 8.2' W ( -80.13670) The primary bench mark is a disk located just west of the SW property corner at 8598 Coconut Street (Moorman Residence), 12.19 m (40.0 ft) SSE of the SW corner of a screened-in porch and pool at the Gould Residence, and 41.85 m (137.3 ft) west of the west tangent point of the SE corner of the sea wall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 10 Station ID: 8722414 PUBLICATION DATE: 03/13/2009 Name: GOMEZ FL NOAA Chart: 11474 Latitude: 27° 5.6' N ( 27.09330) USGS Quad: GOMEZ Longitude: 80° 8.2' W ( -80.13670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 1 1972 DESIGNATION: 872 2414 TIDAL 1 MONUMENTATION: Tidal Station disk VM#: 5471 AGENCY: National Ocean Survey (NOS) IDB PID#: AF6971 SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 27° 5.6' N ( 27.09330) LONGITUDE: 80° 8.2' W ( -80.13670) The primary bench mark is a disk set flush on the concrete sea wall, 41.18 m (135.1 ft) NE of bench mark NO 2 1972, 20 m (65 ft) north of the north tangent point of the SE corner of the sea wall, 1 m (4 ft) south of the property line, and 0.18 m (0.6 ft) from the seaward edge of the sea wall. BENCH MARK STAMPING: NO 2 1972 DESIGNATION: 872 2414 TIDAL 2 MONUMENTATION: Tidal Station disk VM#: 5472 AGENCY: National Ocean Survey (NOS) IDB PID#: AF6972 SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 27° 5.6' N ( 27.09330) LONGITUDE: 80° 8.2' W ( -80.13670) The bench mark is a disk set flush in the concrete sea wall at 8598 Coconut Street, 41.18 m (135.1 ft) SW of bench mark NO 1 1972, 27 m (88 ft) south of the SW corner of the house at 8598 Coconut Street, 24.69 m (81.0 ft) east of bench mark NO 3 1972, 17.16 m (56.3 ft) west of the west tangent point of the SE corner of the sea wall, and 0.18 m (0.6 ft) north of the south edge of the sea wall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 10 Station ID: 8722414 PUBLICATION DATE: 03/13/2009 Name: GOMEZ FL NOAA Chart: 11474 Latitude: 27° 5.6' N ( 27.09330) USGS Quad: GOMEZ Longitude: 80° 8.2' W ( -80.13670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 4 1972 DESIGNATION: 872 2414 TIDAL 4 MONUMENTATION: Tidal Station disk VM#: 5474 AGENCY: National Ocean Survey (NOS) IDB PID#: AF6974 SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 27° 5.6' N ( 27.09330) LONGITUDE: 80° 8.2' W ( -80.13670) The bench mark is a disk set flush in the concrete sea wall at 8597 Coconut Street, 29.93 m (98.2 ft) south of bench mark NO 5 1972, 22 m (72 ft) NE of the north corner of the house at 8598 Coconut Street, and 17.28 m (56.7 ft) north of bench mark NO 1 1972. BENCH MARK STAMPING: NO 5 1972 DESIGNATION: 872 2414 TIDAL 5 MONUMENTATION: Tidal Station disk VM#: 5475 AGENCY: National Ocean Survey (NOS) IDB PID#: AF6975 SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 27° 5.6' N ( 27.09330) LONGITUDE: 80° 8.2' W ( -80.13670) The bench mark is a disk set flush in the concrete sea wall at 8597 Coconut Street, 29.93 m (98.2 ft) north of bench mark NO 4 1972, 23.77 m (78.0 ft) south of the north tangent point of the NE corner of the sea wall at 8597 Coconut Street, and 15.18 m (49.8 ft) east of the SE corner of the house at 8597 Coconut Street.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 10 Station ID: 8722414 PUBLICATION DATE: 03/13/2009 Name: GOMEZ FL NOAA Chart: 11474 Latitude: 27° 5.6' N ( 27.09330) USGS Quad: GOMEZ Longitude: 80° 8.2' W ( -80.13670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 2414 F 1986 DESIGNATION: 872 2414 F TIDAL MONUMENTATION: Tidal Station disk VM#: 5476 AGENCY: National Ocean Service (NOS) IDB PID#: AF7553 SETTING CLASSIFICATION: Concrete box drain OPUS PID#: AF7553 LATITUDE: 27° 5.6' N ( 27.09330) LONGITUDE: 80° 8.6' W ( -80.14330) The bench mark is a disk set 0.09 m (0.3 ft) below the ground in the SW corner of a concrete box drain and bears 8.66 m (28.4 ft) west of the centerline of Gomez Avenue, 7.92 m (26.0 ft) south of the centerline of Coconut Street, and 1.13 m (3.7 ft) west of the west edge of the sidewalk. BENCH MARK STAMPING: 2414 H TIDAL DESIGNATION: 872 2414 H TIDAL MONUMENTATION: Tidal Station disk VM#: 5478 AGENCY: National Ocean Service (NOS) IDB PID#: AF7555 SETTING CLASSIFICATION: Concrete box drain OPUS PID: LATITUDE: 27° 5.6' N ( 27.09330) LONGITUDE: 80° 8.6' W ( -80.14330) The bench mark is a disk set 0.24 m (0.8 ft) below the ground in the NW corner of a concrete box drain and bears 8.53 m (28.0 ft) west of the centerline of Gomez Avenue, 8.53 m (28.0 ft) north of the centerline of Palm Street, 1.58 m (5.2 ft) west of the west edge of a sidewalk, and 64.47 m (211.5 ft) North of 2414 G 1986.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 10 Station ID: 8722414 PUBLICATION DATE: 03/13/2009 Name: GOMEZ FL NOAA Chart: 11474 Latitude: 27° 5.6' N ( 27.09330) USGS Quad: GOMEZ Longitude: 80° 8.2' W ( -80.13670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: D 403 1991 DESIGNATION: D 403 MONUMENTATION: Bench Mark disk VM#: 18921 AGENCY: National Geodetic Survey (NGS) IDB PID#: AF7530 SETTING CLASSIFICATION: Stainless Steel Rod OPUS PID: LATITUDE: 27° 4.0' N ( 27.06667) LONGITUDE: 80° 8.1' W ( -80.13500) The bench mark is a disk located 20.54 m (67.4 ft) WNW of the NW corner of a house, 12.71 m (41.7 ft) WNW of a utility pole, 8.99 m (29.5 ft) ENE of the near rail, 0.30 m (1.0 ft) below the level of the track, 0.30 m (1.0 ft) ENE of a witness post, 0.30 m (1.0 ft) ENE of a right-of-way marker, and on the extended center of SE Pine Cone Lane. The bench mark is crimped to a stainless steel rod driven an unspecified depth to refusal, with access to the datum point through a 5-inch logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 10 Station ID: 8722414 PUBLICATION DATE: 03/13/2009 Name: GOMEZ FL NOAA Chart: 11474 Latitude: 27° 5.6' N ( 27.09330) USGS Quad: GOMEZ Longitude: 80° 8.2' W ( -80.13670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: E 403 1991 DESIGNATION: E 403 MONUMENTATION: Bench Mark disk VM#: 18922 AGENCY: National Geodetic survey (NGS) IDB PID#: AF7529 SETTING CLASSIFICATION: Stainless Steel Rod OPUS PID: LATITUDE: 27° 4.8' N ( 27.08000) LONGITUDE: 80° 8.5' W ( -80.14167) The bench mark is a disk located 28.80 m (94.5 ft) ENE of the highway centerline, 8.11 m (26.6 ft) SSE of the center of SE Pettway Street, 7.89 m (25.9 ft) ENE of the Near Rail of the Florida East Coast Railroad, 7.59 m (24.9 ft) SW of a utility light pole with 2 guy wires, 3.41 m (11.2 ft) NE of a utility pole with a meter attached, and 0.40 m (1.3 ft) SSE of a witness post. The bench mark is crimped to a stainless steel rod driven an unspecified depth to refusal, with access to the datum point through a 5-inch logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 10 Station ID: 8722414 PUBLICATION DATE: 03/13/2009 Name: GOMEZ FL NOAA Chart: 11474 Latitude: 27° 5.6' N ( 27.09330) USGS Quad: GOMEZ Longitude: 80° 8.2' W ( -80.13670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: PINE 1929 NO 3 1980 DESIGNATION: PINE RM 3 MONUMENTATION: Bench Mark disk VM#: 18923 AGENCY: National Geodetic Survey (NGS) IDB PID#: AF6781 SETTING CLASSIFICATION: Concrete Monument OPUS PID: LATITUDE: 27° 5.7' N ( 27.09500) LONGITUDE: 80° 8.9' W ( -80.14833) The bench mark is a disk located 27.31 m (89.6 ft) SW of and level with the highway centerline, 14.11 m (46.3 ft) east of the SE corner of a house, 10.30 m (33.8 ft) NW of the centerline of Southeast Crossrip Street, 8.29 m (27.2 ft) SW of the SW leg of a sign (East Ridge Estates), and 0.21 m (0.7 ft) SE of a witness post. The bench mark is recessed (0.16 ft) blow the ground surface. BENCH MARK STAMPING: 2414 J 2005 DESIGNATION: 872 2414 J TIDAL MONUMENTATION: Tidal Station disk VM#: 18924 AGENCY: National Geodetic Survey (NGS) IDB PID#: SETTING CLASSIFICATION: Stainless Steel Rod OPUS PID: LATITUDE: 27° 5.8' N ( 27.09667) LONGITUDE: 80° 8.6' W ( -80.14333) The bench mark is a disk located 6.64 m (21.8 ft) east of the extended centerline of SE Gomez Avenue, 6.04 m (19.8 ft) north of the centerline of SE Cross Rip Street, 3.66 m (12.0 ft) west of the west edge of a 1.52 m (5.0 ft) concrete sidewalk, 2.90 m (9.5 ft) south of the south edge of a 1.52 m (5.0 ft) wide concrete sidewalk, 0.21 m (0.7 ft) south of a wooden brace pole with two guy wires attached and 0.18 m (0.6 ft) south of a carsonite witness post. The bench mark is a stainless steel rod driven to refusal at a depth of 20.72 m (68.0 ft) with an NGS logo cap flush with the ground and 0.30 m (1.0 ft) below the level of Cross Rip Street.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 10 Station ID: 8722414 PUBLICATION DATE: 03/13/2009 Name: GOMEZ FL NOAA Chart: 11474 Latitude: 27° 5.6' N ( 27.09330) USGS Quad: GOMEZ Longitude: 80° 8.2' W ( -80.13670) T I D A L D A T U M S Tidal datums at GOMEZ based on: LENGTH OF SERIES: 1 MONTH TIME PERIOD: April 1973 - April 1973 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8722429 HOBE SOUND BRIDGE, HOBE SOUND Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: North American Vertical Datum NAVD88 = 0.529 MEAN HIGHER HIGH WATER MHHW = 0.476 MEAN HIGH WATER MHW = 0.438 MEAN SEA LEVEL MSL = 0.246 MEAN TIDE LEVEL MTL = 0.240 MEAN LOW WATER MLW = 0.042 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW NO 3 1972 1.193 0.755 NO 1 1972 1.170 0.732 NO 2 1972 1.183 0.745 NO 4 1972 1.209 0.771 NO 5 1972 1.208 0.770 2414 F 1986 2.019 1.581 2414 H TIDAL 1.994 1.556 D 403 1991 7.464 7.026 E 403 1991 7.244 6.806 PINE 1929 NO 3 1980 6.951 6.513 2414 J 2005 2.185 1.747
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 9 of 10 Station ID: 8722414 PUBLICATION DATE: 03/13/2009 Name: GOMEZ FL NOAA Chart: 11474 Latitude: 27° 5.6' N ( 27.09330) USGS Quad: GOMEZ Longitude: 80° 8.2' W ( -80.13670) Foot Notes: Bench marks 2414 F 1986, 2414 H TIDAL, 2414 J 2005, D 403 1991, E 403 1991 and Pine 1929 NO 3 1980 are based on one differential leveling connection and do not meet the quality control standards of the NOS. Therefore, caution should be used when deriving elevations for these marks.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 10 of 10 Station ID: 8722414 PUBLICATION DATE: 03/13/2009 Name: GOMEZ FL NOAA Chart: 11474 Latitude: 27° 5.6' N ( 27.09330) USGS Quad: GOMEZ Longitude: 80° 8.2' W ( -80.13670) 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.