U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 8516501 PUBLICATION DATE: 11/24/2014 Name: BALDWIN, PARSONAGE COVE, HEMPSTEAD BAY NY NOAA Chart: 12352 Latitude: 40° 38.0' N ( 40.63330) USGS Quad: FREEPORT Longitude: 73° 37.0' W ( -73.61670) To reach the station from the intersection of sunrise highway 27 and N Oceanside road in Rockville center, proceed south on north Oceanside road 1.8 km (1.1 mi), turn left onto Davison Avenue and then immediately continue right at the fork onto Brower Avenue and proceed 1.3 km (0.8 mi) se to the intersection of Brower Avenue and Moreland Avenue, turn right onto Moreland Avenue and then immediately turn left for the mooring marina parking lot and the tide station. The bench marks are located along Atlantic Avenue, Church Street and Grand Boulevard. T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 8516501 PUBLICATION DATE: 11/24/2014 Name: BALDWIN, PARSONAGE COVE, HEMPSTEAD BAY NY NOAA Chart: 12352 Latitude: 40° 38.0' N ( 40.63330) USGS Quad: FREEPORT Longitude: 73° 37.0' W ( -73.61670) T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 09E06N DESIGNATION: 09E 06N MONUMENTATION: Flange-encased Rod VM#: 21122 AGENCY: New York State Department of Public Works IDB PID#: KU4802 SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 40° 38.5' N ( 40.64125) LONGITUDE: 73° 36.8' W ( -73.61261) The primary bench mark is set in the grass near the NE corner of the intersection, 11.68 m (38.3 ft) E of the center of a manhole in the sidewalk on the E side of Grand Avenue, 6.35 m (20.8 ft) WNW of the power pole with tag lil1, 6.20 m (20.3 ft) N of the centerline of church street and 0.23 m (0.8 ft) N of the sidewalk. The bench mark is set 14 cm (6 inches) below the sidewalk being the top of a stainless steel rod encased in a NCDPW logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 8516501 PUBLICATION DATE: 11/24/2014 Name: BALDWIN, PARSONAGE COVE, HEMPSTEAD BAY NY NOAA Chart: 12352 Latitude: 40° 38.0' N ( 40.63330) USGS Quad: FREEPORT Longitude: 73° 37.0' W ( -73.61670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 09E06NAZ DESIGNATION: 09E 06N AZ MONUMENTATION: Flange-encased Rod VM#: 21123 AGENCY: New York State Department of Public Works IDB PID#: KU4822 SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: KU4822 LATITUDE: 40° 38.5' N ( 40.64097) LONGITUDE: 73° 36.6' W ( -73.60961) The bench mark is a flange encased rod set in the sidewalk at the SW corner of the intersection of Church Street and Grand Boulevard, 20.15 m (66.1 ft) ENE of the school flag pole, 11.33 m (37.2 ft) W of the centerline of Grand Boulevard, 6.85 m (22.5 ft) S of the centerline of Church Street and 3.10 m (10.2 ft) ESE of a stop sign on the S side of church street. The bench mark is set 14 cm (6 inches) below the sidewalk being the top of a stainless steel rod encased in a NCDPW logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 8516501 PUBLICATION DATE: 11/24/2014 Name: BALDWIN, PARSONAGE COVE, HEMPSTEAD BAY NY NOAA Chart: 12352 Latitude: 40° 38.0' N ( 40.63330) USGS Quad: FREEPORT Longitude: 73° 37.0' W ( -73.61670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: S 377 1956 DESIGNATION: S 377 MONUMENTATION: Bench Mark disk VM#: 21124 AGENCY: US Coast and Geodetic Survey IDB PID#: KU1665 SETTING CLASSIFICATION: Brick school building OPUS PID: LATITUDE: 40° 38.4' N ( 40.64047) LONGITUDE: 73° 36.6' W ( -73.60961) The bench mark is a disk set vertically in the SE corner of the brick school building, 29.08 m (95.4 ft) W of the centerline of Grand Boulevard, 22.39 m (73.5 ft) S of concrete stairs to a building entrance, 0.36 m (1.2 ft) N of the SE corner of the building and 0.20 m (0.7 ft) above the sidewalk. BENCH MARK STAMPING: 6501 A 2014 DESIGNATION: 851 6501 A MONUMENTATION: Bench Mark disk VM#: 21125 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Concrete base of boat house OPUS PID: LATITUDE: 40° 38.3' N ( 40.63786) LONGITUDE: 73° 37.0' W ( -73.61725) The bench mark is set on the E side of the mooring marina building on the N side of the garage door sill, 23.98 m (78.7 ft) W of the SW corner of the cinderblock storage building, 13.27 m (43.5 ft) S of the concrete roadway wall, 13.26 m (43.5 ft) N of the SE corner of the mooring marina building, 5.95 m (19.5 ft) N of the center of the man door and 0.18 m (0.6 ft) S of the N end of the door.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 8516501 PUBLICATION DATE: 11/24/2014 Name: BALDWIN, PARSONAGE COVE, HEMPSTEAD BAY NY NOAA Chart: 12352 Latitude: 40° 38.0' N ( 40.63330) USGS Quad: FREEPORT Longitude: 73° 37.0' W ( -73.61670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6501 B 2014 DESIGNATION: 851 6501 B MONUMENTATION: Bench Mark disk VM#: 21126 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Concrete base of a bridge guard rail OPUS PID: LATITUDE: 40° 38.3' N ( 40.63819) LONGITUDE: 73° 37.0' W ( -73.61650) The bench mark is set in the E end of the concrete base of the guard rail along the S side of the bridge, 10.70 m (35.1 ft) E of the W face of the E bridge abutment, 2.68 m (8.8 ft) W of the SW corner of a rectangular electric vault cover, 2.51 m (8.2 ft) S of the steel curb, 0.19 m (0.6 ft) E of the first guard rail post and 0.15 m (0.5 ft) W of the W edge of the concrete wall with the Nassau county emblem.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 8516501 PUBLICATION DATE: 11/24/2014 Name: BALDWIN, PARSONAGE COVE, HEMPSTEAD BAY NY NOAA Chart: 12352 Latitude: 40° 38.0' N ( 40.63330) USGS Quad: FREEPORT Longitude: 73° 37.0' W ( -73.61670) T I D A L D A T U M S Tidal datums at BALDWIN, PARSONAGE COVE, HEMPSTEAD BAY based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: May 2014 - July 2014 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8531680 SANDY HOOK Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 1.482 MEAN HIGH WATER MHW = 1.382 MEAN SEA LEVEL MSL = 0.737 MEAN TIDE LEVEL MTL = 0.719 MEAN LOW WATER MLW = 0.055 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 09E06N 4.275 2.893 09E06NAZ 4.737 3.355 S 377 1956 5.311 3.929 6501 A 2014 3.565 2.183 6501 B 2014 6.973 5.591
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 8516501 PUBLICATION DATE: 11/24/2014 Name: BALDWIN, PARSONAGE COVE, HEMPSTEAD BAY NY NOAA Chart: 12352 Latitude: 40° 38.0' N ( 40.63330) USGS Quad: FREEPORT Longitude: 73° 37.0' W ( -73.61670) 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.