U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8519436 PUBLICATION DATE: 12/04/2014 Name: GREAT KILLS HARBOR NY NOAA Chart: 12331 Latitude: 40° 32.6' N ( 40.54330) USGS Quad: ARTHUR KILL Longitude: 74° 8.4' W ( -74.14000) To reach the tide station from the toll station at the W end of the Verrazano Narrows bridge, proceed 0.3 km (0.2 mi) W on i-278 to exit 15S on the right for lily pond avenue S, proceed 0.25 km (0.15 mi) around the exit ramp onto S Lily Pond Avenue, continue 0.9 km (0.6 mi) SE on Lily Pond Avenue to the sharp bend to the right, continue S and then SW 3.8 km (2.4 mi) on Father Capodanno Boulevard to Midland Avenue, turn right onto Midland Avenue and proceed NE 1.3 km (0.8 mi) to Hylan Boulevard, turn left and proceed 5.3 km (3.3 mi) SW on Hylan Boulevard to Cleveland Avenue, turn left and proceed SE 0.2 km (0.1 mi) on Cleveland Avenue to Mansion Avenue, turn left and proceed 0.3 km (0.2 mi) NE on Mansion Avenue to the gated entrance to the Richmond county yacht club on the right and the tide station at the end of the wooden dock. The bench marks are along Mansion Avenue and in the national park service gateway national recreation area at Great Kills Park. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 9436 D 2014 DESIGNATION: 851 9436 D MONUMENTATION: Flange-encased Rod VM#: 21080 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 40° 32.8' N ( 40.54628) LONGITUDE: 74° 7.8' W ( -74.13058) The primary bench mark is a flange encased rod set in the grass between the gravel road and the shore, 35.55 m (116.6 ft) W of the bulkhead road street sign, 13.68 m (44.9 ft) S of the centerline of the gravel road, 8.70 m (28.5 ft) NE of the wooden bulkhead and 1.32 m (4.3 ft) SW of a wooden piling along the edge of the gravel road.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8519436 PUBLICATION DATE: 12/04/2014 Name: GREAT KILLS HARBOR NY NOAA Chart: 12331 Latitude: 40° 32.6' N ( 40.54330) USGS Quad: ARTHUR KILL Longitude: 74° 8.4' W ( -74.14000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9436 B 2014 DESIGNATION: 851 9436 B MONUMENTATION: Bench Mark disk VM#: 21081 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Concrete island OPUS PID: LATITUDE: 40° 32.7' N ( 40.54444) LONGITUDE: 74° 8.4' W ( -74.14061) The bench mark is a disk set in the NW end of the concrete island for the automatic gate to the Richmond county yacht club parking lot, 45.42 m (149.0 ft) NNW of the most N corner of the bulkhead, 28.28 m (92.8 ft) SE of the SE corner of the marina grand restaurant, 11.85 m (38.9 ft) SE of the centerline of mansion avenue and 3.52 m (11.5 ft) NW of the automated entrance gate. BENCH MARK STAMPING: 9436 A 2014 DESIGNATION: 851 9436 A MONUMENTATION: Bench Mark disk VM#: 21082 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Footing of a garage door OPUS PID: LATITUDE: 40° 32.6' N ( 40.54297) LONGITUDE: 74° 8.5' W ( -74.14175) The bench mark is a disk set in a garage door sill on the N side of the Staten Island yacht sales building, 22.60 m (74.1 ft) S of the SE corner of the one story building to the N along mansion avenue, 14.48 m (47.5 ft) ESE of the NW corner of the building, 6.62 m (21.7 ft) WNW of the NE corner of the building and 0.15 m (0.5 ft) WNW of the E side of the garage door.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8519436 PUBLICATION DATE: 12/04/2014 Name: GREAT KILLS HARBOR NY NOAA Chart: 12331 Latitude: 40° 32.6' N ( 40.54330) USGS Quad: ARTHUR KILL Longitude: 74° 8.4' W ( -74.14000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9436 C 2014 DESIGNATION: 851 9436 C MONUMENTATION: Bench Mark disk VM#: 21083 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Concrete flagpole base OPUS PID: LATITUDE: 40° 32.8' N ( 40.54589) LONGITUDE: 74° 8.2' W ( -74.13728) The bench mark is a disk set in a concrete base for a flagpole, 27.91 m (91.6 ft) S of a power pole near the fence along the NE side of the boat yard, 17.60 m (57.7 ft) ESE of a light pole in the boat yard, 16.47 m (54.0 ft) S of the NW corner of the concrete pad for the travel lift, 9.58 m (31.4 ft) NNW of the bulkhead and 14 cm (6 inches) above grade. BENCH MARK STAMPING: 9436 E 2014 DESIGNATION: 851 9436 E MONUMENTATION: Flange-encased Rod VM#: 21084 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBDM38 LATITUDE: 40° 32.7' N ( 40.54494) LONGITUDE: 74° 7.6' W ( -74.12728) The bench mark is a flange encased rod set in the grass E of the building, 51.15 m (167.8 ft) SW of the SW corner of a green electrical utility box along the gravel road, 37.62 m (123.4 ft) SSE of a fire hydrant, 26.17 m (85.9 ft) ENE of the SE corner of the building, 23.89 m (78.4 ft) SE of the NE corner of the building and 10.39 m (34.1 ft) WSW of the center of a bench.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8519436 PUBLICATION DATE: 12/04/2014 Name: GREAT KILLS HARBOR NY NOAA Chart: 12331 Latitude: 40° 32.6' N ( 40.54330) USGS Quad: ARTHUR KILL Longitude: 74° 8.4' W ( -74.14000) T I D A L D A T U M S Tidal datums at GREAT KILLS HARBOR 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 = 1.666 MEAN HIGH WATER MHW = 1.564 MEAN SEA LEVEL MSL = 0.832 MEAN TIDE LEVEL MTL = 0.815 MEAN LOW WATER MLW = 0.066 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 9436 D 2014 3.749 2.185 9436 B 2014 2.734 1.170 9436 A 2014 3.226 1.662 9436 C 2014 3.419 1.855 9436 E 2014 6.554 4.990
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8519436 PUBLICATION DATE: 12/04/2014 Name: GREAT KILLS HARBOR NY NOAA Chart: 12331 Latitude: 40° 32.6' N ( 40.54330) USGS Quad: ARTHUR KILL Longitude: 74° 8.4' W ( -74.14000) 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.