U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8724970 PUBLICATION DATE: 02/05/2004 Name: FAKA UNION BAY FL NOAA Chart: 11429 Latitude: 25° 54.2' N ( 25.90330) USGS Quad: ROYAL PALM HAMMOCK Longitude: 81° 30.8' W ( -81.51330) To reach the tidal bench marks from the Remuda Ranch Marina on State Highway 91, proceed by boat from the Marina along the Faka Union River to the mouth of the river at the Faka Union Bay. The tide gage and staff were SW of the mouth of the river. The bench marks are located NW of the gage site, marker NO. 51, and along a path leading through the mangrove. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 4970 A 1978 DESIGNATION: 872 4970 A TIDAL MONUMENTATION: Tidal Station disk VM#: 9738 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 25° 54.2' N ( 25.90330) LONGITUDE: 81° 30.8' W ( -81.51330) The primary bench mark is a disk located 110 m (360 ft) NW of channel marker NO. 51, 18.78 m (61.6 ft) west of the mangrove line, 0.15 m (0.5 ft) north of a witness post. The bench mark is 0.24 m (0.8 ft) above ground level, crimped to the top of a copper-clad steel rod driven 9.8 m (32 ft) to substantial resistance and encased in a steel pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8724970 PUBLICATION DATE: 02/05/2004 Name: FAKA UNION BAY FL NOAA Chart: 11429 Latitude: 25° 54.2' N ( 25.90330) USGS Quad: ROYAL PALM HAMMOCK Longitude: 81° 30.8' W ( -81.51330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4970 B 1978 DESIGNATION: 872 4970 B TIDAL MONUMENTATION: Tidal Station disk VM#: 9739 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 25° 54.2' N ( 25.90330) LONGITUDE: 81° 30.8' W ( -81.51330) The bench mark is a disk located NW of the gage site, 28.35 m (93.0 ft) west of the mangrove edge, 13.20 m (43.3 ft) north of bench mark 4970 A 1978, and 0.24 m (0.8 ft) SE of a witness post. The bench mark is 0.27 m (0.9 ft) above ground level, crimped to the top of a copper-clad steel rod driven 9.8 m (32 ft) to substantial resistance and encased in a steel pipe and concrete kickblock. BENCH MARK STAMPING: 4970 C 1978 DESIGNATION: 872 4970 C TIDAL MONUMENTATION: Tidal Station disk VM#: 9740 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 25° 54.2' N ( 25.90330) LONGITUDE: 81° 30.8' W ( -81.51330) The bench mark is a disk located NW of the gage site, 10.79 m (35.4 ft) WNW of bench mark 4970 B 1978, and 0.24 m (0.8 ft) SE of a witness post. The bench mark is 0.34 m (1.1 ft) above ground level, crimped to the top of a copper-clad steel rod driven 9.8 m (32 ft) to substantial resistance and encased in a steel pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8724970 PUBLICATION DATE: 02/05/2004 Name: FAKA UNION BAY FL NOAA Chart: 11429 Latitude: 25° 54.2' N ( 25.90330) USGS Quad: ROYAL PALM HAMMOCK Longitude: 81° 30.8' W ( -81.51330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4970 D 1978 DESIGNATION: 872 4970 D TIDAL MONUMENTATION: Tidal Station disk VM#: 9741 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 25° 54.2' N ( 25.90330) LONGITUDE: 81° 30.8' W ( -81.51330) The bench mark is a disk located NW of the gage site, 46 m (150 ft) west of the mangrove line, 13.75 m (45.1 ft) WSW of bench mark 4970 C 1978, and 0.27 m (0.9 ft) SE of a witness post. The bench mark is 15 cm (0.5 ft) above ground level, crimped to the top of a copper-clad steel rod driven 9.8 m (32 ft) to substantial resistance and encased in a steel pipe and concrete kickblock. BENCH MARK STAMPING: 4970 E 1978 DESIGNATION: 872 4970 E TIDAL MONUMENTATION: Tidal Station disk VM#: 9742 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 25° 54.2' N ( 25.90330) LONGITUDE: 81° 30.8' W ( -81.51330) The bench mark is a disk located NW of the gage site, 42.67 m (140.0 ft) NW of the mangrove line, 17.50 m (57.4 ft) SW of bench mark 4970 D 1978, and 0.24 m (0.8 ft) NNE of a witness post. The bench mark is 0.12 m (0.4 ft) above ground level, crimped to the top of a copper-clad steel rod driven 9.8 m (32 ft) to substantial resistance and encased in a steel pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8724970 PUBLICATION DATE: 02/05/2004 Name: FAKA UNION BAY FL NOAA Chart: 11429 Latitude: 25° 54.2' N ( 25.90330) USGS Quad: ROYAL PALM HAMMOCK Longitude: 81° 30.8' W ( -81.51330) T I D A L D A T U M S Tidal datums at FAKA UNION BAY based on: LENGTH OF SERIES: 4 MONTHS TIME PERIOD: December 1977 - March 1978 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8725110 NAPLES, GULF OF MEXICO Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.853 MEAN HIGH WATER MHW = 0.775 MEAN TIDE LEVEL MTL = 0.440 MEAN SEA LEVEL MSL = 0.418 MEAN LOW WATER MLW = 0.105 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 4970 A 1978 0.884 0.109 4970 B 1978 0.984 0.209 4970 C 1978 1.085 0.310 4970 D 1978 0.995 0.220 4970 E 1978 0.958 0.183
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8724970 PUBLICATION DATE: 02/05/2004 Name: FAKA UNION BAY FL NOAA Chart: 11429 Latitude: 25° 54.2' N ( 25.90330) USGS Quad: ROYAL PALM HAMMOCK Longitude: 81° 30.8' W ( -81.51330) 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.