U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8723423 PUBLICATION DATE: 09/15/2004 Name: TURKEY POINT, BISCAYNE BAY FLORIDA NOAA Chart: 11462 Latitude: 25° 26.2' N USGS Quad: ARSENICKER KEYS Longitude: 80° 19.8' W To reach the tidal bench marks from the intersection of U.S. Highway 1 and Palm Drive in Florida City, proceed 13 km (8 mi) east, then 1.9 km (1.2 mi) SE on a paved road to the Turkey Point Power Plant. The bench marks are in the vicinity of the Turkey Point Power Plant boat ramp and fuel pier. The tide gage and staff were located on the southwestern side of the boat ramp. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: A 316 1970 DESIGNATION: A 316 MONUMENTATION: Bench Mark disk VM#: 5846 AGENCY: National Geodetic Survey (NGS) PID#: AC1173 SETTING CLASSIFICATION: Concrete wall The bench mark is a disk set flush in the top of a concrete wall along the north side of the cooling canal at the fuel pier, 5.43 m (17.8 ft) south of the SE fuel pier, 1 m (3 ft) above the fuel pier, 8.23 m (27.0 ft) SE (130 magnetic) of asphalt drive where sidewalk runs perpendicular to drive, and 11.28 m (37.0 ft) SW (190 magnetic) from the NE corner of fence at the south gate post on asphalt drive. BENCH MARK STAMPING: B 316 1970 DESIGNATION: B 316 MONUMENTATION: Bench Mark disk VM#: 5847 AGENCY: National Geodetic Survey (NGS) PID#: AC1172 SETTING CLASSIFICATION: Concrete box The bench mark is a disk set flush in the NE corner of the top of a 1 m x 2 m (4 ft x 8 ft) concrete box with a metal cover, 39.62 m (130.0 ft) south (170 magnetic) from the west steel fuel tank, 10.67 m (35.0 ft) NNE (30 magnetic) of the north side of a concrete drain culvert that is positioned under asphalt drive, 6.55 m (21.5 ft) north of the centerline of the driveway, and level with the driveway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 8723423 PUBLICATION DATE: 09/15/2004 Name: TURKEY POINT, BISCAYNE BAY FLORIDA NOAA Chart: 11462 Latitude: 25° 26.2' N USGS Quad: ARSENICKER KEYS Longitude: 80° 19.8' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: LM 12 316 DESIGNATION: LM 12 316 FLPCO MONUMENTATION: Cap-and-Bolt VM#: 5848 AGENCY: Florida Power & Light Company (FLPCO) PID#: AC3303 SETTING CLASSIFICATION: Galvanized steel pipe The bench mark is a stainless steel bolt and washer located 0.6 km (0.5 mi) SW of the power plant, 8.23 m (27 ft) north of the centerline of the paved road, 2.59 m (8.5 ft) east of a foot bridge, and 2.19 m (7.2 ft) south of the intake canal. The bench mark is cemented into a 0.03 m (0.1 ft) diameter galvanized steel pipe driven to a depth of 6.1 m (20 ft), and encased in a pipe that projects 0.21 m (0.7 ft) above ground level. BENCH MARK STAMPING: TURKEY POINT NO 2 NO 2 DESIGNATION: TURKEY POINT 2 RM 2 MONUMENTATION: Reference Mark disk VM#: 5849 AGENCY: US Coast and Geodetic Survey (USC&GS) PID#: AC1176 SETTING CLASSIFICATION: Metal pipe imbedded in ground The bench mark is a disk set on a metal pipe embeded in ground, located about 1.3 km (0.8 mi) east of the Turkey Point Nuclear Power Plant on a peninsula known locally as Turkey Point, near the center of a picnic area, 55 m (180 ft) west of the shoreline at the east end of the point, 2 m (5 ft) west of the west edge of a stone wall, and 0.46 m (1.5 ft) below ground level in a depression. Note: Access to the bench mark is through the top of a 0.46 m (1.5 ft) diameter barrel.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 8723423 PUBLICATION DATE: 09/15/2004 Name: TURKEY POINT, BISCAYNE BAY FLORIDA NOAA Chart: 11462 Latitude: 25° 26.2' N USGS Quad: ARSENICKER KEYS Longitude: 80° 19.8' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: TURKEY POINT 3 1972 DESIGNATION: TURKEY PT 3 MONUMENTATION: Survey disk VM#: 5850 AGENCY: National Geodetic Survey (NGS) PID#: AE9200 SETTING CLASSIFICATION: Concrete monument The bench mark is a disk set on top of a round concrete post located 0.3 km (0.2 mi) NW of a point known locally as Turkey Point, 46 m (150 ft) NNW of the shoreline on the south side, 27 m (88 ft) SSE of the centerline of a gravel road, and 10 m (32 ft) NNW of the centerline of the road on the south side. BENCH MARK STAMPING: 3423 A 1993 DESIGNATION: 872 3423 A MONUMENTATION: Tidal Station disk VM#: 12527 AGENCY: National Ocean Service (NOS) PID: SETTING CLASSIFICATION: Concrete bulkhead The bench mark is a disk set flush in the SW corner of the top of a concrete bulkhead, attached to a 1.83 m x 2.44 m (6.0 ft x 8.0 ft) covered concrete pad (fish cleaning stand), 8.23 m (27.0 ft) west of the southwestern corner of the boat ramp, 8 m (26 ft) south of a 0.3 m (1 ft) square concrete light pole with two lights mounted at the top, 0.21 m (0.7 ft) north of the south edge of bulkhead, and 0.21 m (0.8 ft) east of the west end of bulkhead.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 8723423 PUBLICATION DATE: 09/15/2004 Name: TURKEY POINT, BISCAYNE BAY FLORIDA NOAA Chart: 11462 Latitude: 25° 26.2' N USGS Quad: ARSENICKER KEYS Longitude: 80° 19.8' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 3423 B 1993 DESIGNATION: 872 3423 B MONUMENTATION: Tidal Station disk VM#: 12528 AGENCY: National Ocean Service (NOS) PID: SETTING CLASSIFICATION: Concrete pad The bench mark is a disk set flush in the top of a 2.13 m x 2.13 m (7.0 ft x 7.0 ft) concrete pad, 30.48 m (100.0 ft) north of the SW end of the bulkhead, 7.47 m (24.5 ft) west of the NW corner of the boat ramp, and 0.43 m (1.4 ft) east of a steel I-beam covered with plastic piping located in the concrete pad. BENCH MARK STAMPING: 3423 C 1993 DESIGNATION: 872 3423 C 1993 MONUMENTATION: Tidal Station disk VM#: 12529 AGENCY: National Ocean Service (NOS) PID: SETTING CLASSIFICATION: Concrete bulkhead The bench mark is a disk set flush in the top of a concrete bulkhead on the SE side of the boat ramp, 4.57 m (15.0 ft) west of the SE end of the bulkhead, 3.81 m (12.5 ft) east of the SW corner of the bulkhead to the boat ramp, and 0.15 m (0.5 ft) north of the south edge of the bulkhead.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 8723423 PUBLICATION DATE: 09/15/2004 Name: TURKEY POINT, BISCAYNE BAY FLORIDA NOAA Chart: 11462 Latitude: 25° 26.2' N USGS Quad: ARSENICKER KEYS Longitude: 80° 19.8' W T I D A L D A T U M S Tidal datums at TURKEY POINT, BISCAYNE BAY based on: LENGTH OF SERIES: 1 YEAR TIME PERIOD: May 1970 - April 1971 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8723170 MIAMI BEACH (CITY PIER) Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (10/18/1970) = 0.935 MEAN HIGHER HIGH WATER (MHHW) = 0.543 NORTH AMERICAN VERTICAL DATUM-1988 (NAVD) = 0.536 MEAN HIGH WATER (MHW) = 0.525 MEAN TIDE LEVEL (MTL) = 0.279 MEAN SEA LEVEL (MSL) = 0.271 MEAN LOW WATER (MLW) = 0.033 MEAN LOWER LOW WATER (MLLW) = 0.000 LOWEST OBSERVED WATER LEVEL (04/24/1971) = -0.340 National Geodetic Vertical Datum (NGVD 29) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW A 316 1970 2.617 2.092 B 316 1970 2.154 1.629 LM 12 316 2.369 1.844 TURKEY POINT NO 2 NO 2 0.560 0.035 TURKEY POINT 3 1972 1.078 0.553 3423 A 1993 1.187 0.662 3423 B 1993 1.174 0.649 3423 C 1993 1.183 0.658
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 8723423 PUBLICATION DATE: 09/15/2004 Name: TURKEY POINT, BISCAYNE BAY FLORIDA NOAA Chart: 11462 Latitude: 25° 26.2' N USGS Quad: ARSENICKER KEYS Longitude: 80° 19.8' W 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 (NAVD 88). NGVD 29 is a fixed datum adopted as a national standard geodetic reference for heights but is now considered superseded. NGVD 29 is sometimes referred to as Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological Survey Topographic Quads. NGVD 29 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 NGVD 29 are available from the National Geodetic Survey (NGS) data base via the World Wide Web at National Geodetic Survey. NAVD 88 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. NAVD 88 replaces NGVD 29 as the national standard geodetic reference for heights. Bench mark elevations relative to NAVD 88 are available from NGS through the World Wide Web at National Geodetic Survey. NGVD 29 and NAVD 88 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 NAVD 88 elevation is shown on the Elevations of Tidal Datums Table Referred to MLLW only when two or more of the bench marks listed have NAVD 88 elevations. The NAVD 88 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, NAVD 88 bench mark elevations computed indirectly from the tidal datums elevation table may differ slightly from NAVD 88 elevations listed for each bench mark in the NGS database.