U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8729017 PUBLICATION DATE: 04/21/2003 Name: FARMDALE, EAST BAY, ST. ANDREW BAY FL NOAA Chart: 11389 Latitude: 30° 1.0' N ( 30.01670) USGS Quad: ALLANTON Longitude: 85° 28.2' W ( -85.47000) To reach the tidal bench marks proceed west along U.S. 98 from the Bay-Gulf County line at the intersection of U.S. 98 and State Road 386 about 10.7 km (6.7 mi) passing through Mexico Beach, turn right on a semi-improved road and proceed due north about 2.6 km (1.6 mi) passing the Farmdale Cemetry on the right to the end where road forms a T, turn right (east) and follow this road to Farmdale and Allan's Fish camp, proceed due south about 195 m (640 ft) to the shoreline. The bench marks were located in the vicinity and tide gauge was located approximately 46 m (150 ft) south into water from this point. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 9017 A 1991 DESIGNATION: 872 9017 A MONUMENTATION: Flange-encased Rod VM#: 12503 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 30° 1.0' N ( 30.01670) LONGITUDE: 85° 28.2' W ( -85.47000) The primary bench mark is a flange encased rod near the military encampment area, 36 m (119 ft) north of the shoreline, 12 m (40 ft) SE of the end of the dim road, 1.83 m (6.0 ft) east of the extended centerline of the road, 0.49 m (1.6 ft) east of a 4-inch diameter white PVC pipe that projects 1.43 m (4.7 ft) (acting as a witness post), and 0.34 m (1.1 ft) west of a Carsonite witness post. The datum point is the top of a stainless steel rod driven 19.5 m (64 ft) to refusal and encased in a 5-inch PVC pipe with logo cap and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8729017 PUBLICATION DATE: 04/21/2003 Name: FARMDALE, EAST BAY, ST. ANDREW BAY FL NOAA Chart: 11389 Latitude: 30° 1.0' N ( 30.01670) USGS Quad: ALLANTON Longitude: 85° 28.2' W ( -85.47000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9017 B 1991 DESIGNATION: 872 9017 B MONUMENTATION: Flange-encased Rod VM#: 12504 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 30° 1.0' N ( 30.01670) LONGITUDE: 85° 28.2' W ( -85.47000) The bench mark is a flange encased rod west of the military encampment in a small open area along the dim track road, 12.95 m (42.5 ft) north of a palm tree, 0.46 m (1.5 ft) WSW of a 4-inch diameter white PVC pipe that projects 1.07 m (3.5 ft) (acting as a witness post), and 0.40 m (1.3 ft) ENE of a Carsonite witness post. The datum point is the top of a stainless steel rod driven 24.4 m (80 ft) and encased in a 5-inch PVC pipe with logo cap and concrete kickblock. BENCH MARK STAMPING: 9017 C 1991 DESIGNATION: 872 9017 C MONUMENTATION: Flange-encased Rod VM#: 12505 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 30° 1.0' N ( 30.01670) LONGITUDE: 85° 28.2' W ( -85.47000) The bench mark is a flange encased rod 0.56 km (0.35 mile) east of the T-junction along the dim dirt road, 60.66 m (199.0 ft) NW of an old power pole with no wires attached, 9.60 m (31.5 ft) north of the centerline of the dim dirt road, 0.61 m (2.0 ft) north of a 4-inch diameter white PVC pipe projecting 0.91 m (3.0 ft) (acting as a witness post), and 0.40 m (1.3 ft) south of a Carsonite witness post. The datum point is the top of a stainless steel rod driven 24.4 m (80 ft) and encased in a 5-inch PVC pipe with logo cap and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8729017 PUBLICATION DATE: 04/21/2003 Name: FARMDALE, EAST BAY, ST. ANDREW BAY FL NOAA Chart: 11389 Latitude: 30° 1.0' N ( 30.01670) USGS Quad: ALLANTON Longitude: 85° 28.2' W ( -85.47000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9017 D 1991 DESIGNATION: 872 9017 D MONUMENTATION: Tidal Station disk VM#: 12506 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 1.0' N ( 30.01670) LONGITUDE: 85° 28.2' W ( -85.47000) The bench mark is a disk set in top of a concrete monument 0.40 km (0.25 mile) east of the T-junction along the dim dirt road and near the intersection of a dim dirt road leading south, 13.56 m (44.5 ft) south of the centerline of the east-west dim dirt road, 7.92 m (26.0 ft) west of the centerline of the north-south dim dirt road, 0.61 m (2.0 ft) west of a 4-inch diameter white PVC pipe projecting 1.04 m (3.4 ft) (acting as a witness post), and 0.40 m (1.3 ft) east of a Carsonite witness post. BENCH MARK STAMPING: 9017 E 1991 DESIGNATION: 872 9017 E MONUMENTATION: Flange-encased Rod VM#: 12507 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 30° 1.0' N ( 30.01670) LONGITUDE: 85° 28.2' W ( -85.47000) The bench mark is a flange encased rod near the T-junction, 16.55 m (54.3 ft) south of a dim dirt road running east-west, 12.50 m (41.0 ft) south of the south end of a 0.61 m (2.0 ft) square concrete culvert running north-south, 7.16 m (23.5 ft) west of the the centerline of a dim dirt road running north-south, 0.61 m (2.0 ft) west of a 4-inch diameter white PVC pipe projecting 0.76 m (2.5 ft) (acting as a witness post), and 0.30 m (1.0 ft) east of a Carsonite witness post. The datum point is the top of a stainless steel rod driven 24.4 m (80 ft) and encased in a 5-inch PVC pipe with logo cap and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8729017 PUBLICATION DATE: 04/21/2003 Name: FARMDALE, EAST BAY, ST. ANDREW BAY FL NOAA Chart: 11389 Latitude: 30° 1.0' N ( 30.01670) USGS Quad: ALLANTON Longitude: 85° 28.2' W ( -85.47000) T I D A L D A T U M S Tidal datums at FARMDALE, EAST BAY, ST. ANDREW BAY based on: LENGTH OF SERIES: 1 Month TIME PERIOD: September 1991 - September 1991 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8729108 PANAMA CITY, ST. ANDREW BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.476 MEAN HIGH WATER MHW = 0.438 MEAN TIDE LEVEL MTL = 0.238 MEAN SEA LEVEL MSL = 0.236 MEAN LOW WATER MLW = 0.038 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 9017 A 1991 1.134 0.696 9017 B 1991 1.799 1.361 9017 C 1991 1.514 1.076 9017 D 1991 2.242 1.804 9017 E 1991 1.820 1.382
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8729017 PUBLICATION DATE: 04/21/2003 Name: FARMDALE, EAST BAY, ST. ANDREW BAY FL NOAA Chart: 11389 Latitude: 30° 1.0' N ( 30.01670) USGS Quad: ALLANTON Longitude: 85° 28.2' W ( -85.47000) 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.