U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 PUBLICATION DATE: 06/24/1983 Station ID: 9414358 SUPERCEDED DATE: 04/21/2003 Name: HUNTERS POINT, SAN FRANCISCO BAY CALIFORNIA NOAA Chart: 18649 Latitude: 37° 43.8' N USGS Quad: HUNTERSPOINT Longitude: 122° 21.4' W To reach the tidal bench marks from I-280 and U.S. Highway 101 interchange proceed 1.4 miles (2.2 km) south to Bayshore Blvd., Third Street exit, left onto Third Street, north 1.8 miles (2.9 km) to Evans Street, right turn on Evans Street, 0.7 mile (1.1 km) SE on Evans Street, one block south on Evans Street to Fairfax Street, right on Hunters Point Boulevard, 0.2 mile (0.3 km) after left turn on Innes Avenue and then 0.4 mile (0.6 km) to entrance to guard house with dry dock area at bottom of hill. The tide gage was located 50 feet (15.2 m) NW of NW corner of drydock No. 2 and the staff was located on an adjacent pier. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: HUNTERS POINT BM 2 1917 MONUMENTATION: Survey Disk VM#: 8098 AGENCY: PID#: HT0619 SETTING CLASSIFICATION: Wall The bench mark is set vertically in west wall at the NW corner of the small brick pump house (Building No. 204), between drydocks No. 2 and 3, 100 feet (30.5 m) east of center of capstan at SE corner of drydock No. 3, 64 feet (19.5 m) east of SE corner of south end of caisson of drydock, No. 2, and 0.5 foot (0.2 m) above the paved ground. BENCH MARK STAMPING: HUNTERS POINT BM 3 1917 MONUMENTATION: Survey Disk VM#: 8099 AGENCY: PID#: HT0618 SETTING CLASSIFICATION: Wall The bench mark is set veritically on south wall of brick boiler room C building No. 205, between drydocks No. 2 and 3, 100 feet (30.5 m) east of SW corner of boiler room building, 35 feet (10.7 m) north of north edge of drydock No. 2 and 15 feet (4.6 m) east of the centerline of the door at center of the boiler room wall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 PUBLICATION DATE: 06/24/1983 Station ID: 9414358 SUPERCEDED DATE: 04/21/2003 Name: HUNTERS POINT, SAN FRANCISCO BAY CALIFORNIA NOAA Chart: 18649 Latitude: 37° 43.8' N USGS Quad: HUNTERSPOINT Longitude: 122° 21.4' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4 1941 MONUMENTATION: Survey Disk VM#: 8100 AGENCY: PID#: HT0616 SETTING CLASSIFICATION: Concrete Platform The bench mark is set in top of SE corner of concrete loading platform at NE corner of large concrete machine shop Building No. 231, 96 feet (29.3 m) south of south side of drydock, No. 2, 0.5 foot (0.2 m) north of north wall of the building, and 3.4 feet (1.0 m) above the pavement. BENCH MARK STAMPING: 5 1941 MONUMENTATION: Survey Disk VM#: 8101 AGENCY: PID#: HT0615 SETTING CLASSIFICATION: Concrete Platform The bench mark is set on top of NW corner of concrete loading platform at the SW corner of the large concrete machine shop, Building No. 231, 260 feet (79.2 m) south of drydock No. 2, 0.5 foot (0.2 m) south of south wall of building, and 3 feet (0.9 m) above the pavement. BENCH MARK STAMPING: HUNTER WEST 1 1941 MONUMENTATION: Survey Disk VM#: 8102 AGENCY: PID#: HT0613 SETTING CLASSIFICATION: Concrete Post The bench mark is set in a concrete post at the head of drydock, No. 2, covered with a steel handhole and cover plate, 108 feet (32.9 m) south by east of center of capstan at head of drydock, 95 feet (29 m) west by north of fireplug on south side and near west end of drydock, 6 feet (1.8 m) west of inner rail of 50 ton crane, and 0.7 foot (0.2 m) below the pavement.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 PUBLICATION DATE: 06/24/1983 Station ID: 9414358 SUPERCEDED DATE: 04/21/2003 Name: HUNTERS POINT, SAN FRANCISCO BAY CALIFORNIA NOAA Chart: 18649 Latitude: 37° 43.8' N USGS Quad: HUNTERSPOINT Longitude: 122° 21.4' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: HUNTER EAST 1941 MONUMENTATION: Survey Disk VM#: 8103 AGENCY: PID#: HT0620 SETTING CLASSIFICATION: Retaining Wall The bench mark is set in the subsurface concrete retaining wall with a steel handhole and coverplate stamped SFWD over the mark at yard level, 96 feet (29.3 m) west of SW end of drydock caisson, 64 feet (19.5 m) west by north of center of capstan at SE end of drydock, 18 feet (5.5 m) south of south side of drydock, and 0.8 foot (0.2 m) below the pavement of yard.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 PUBLICATION DATE: 06/24/1983 Station ID: 9414358 SUPERCEDED DATE: 04/21/2003 Name: HUNTERS POINT, SAN FRANCISCO BAY CALIFORNIA NOAA Chart: 18649 Latitude: 37° 43.8' N USGS Quad: HUNTERSPOINT Longitude: 122° 21.4' W T I D A L D A T U M S Tidal datums at HUNTERS POINT, SAN FRANCISCO BAY based on: LENGTH OF SERIES: 13 MONTHS TIME PERIOD: NOV 1974-FEB 1976 TIDAL EPOCH: 1960-1978 CONTROL TIDE STATION: 9414760 ALAMEDA, CA Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET: HIGHEST OBSERVED WATER LEVEL (12/27/1974) = 8.16 MEAN HIGHER HIGH WATER MHHW = 6.73 MEAN HIGH WATER MHW = 6.10 MEAN TIDE LEVEL MTL = 3.61 * NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 3.12 MEAN LOW WATER MLW = 1.12 MEAN LOWER LOW WATER MLLW = 0.00 LOWEST OBSERVED WATER LEVEL (12/01/1975) = -1.86 * NGVD reference based on adjustment of 1958 and NOS levels of1974-1976. North American Vertical Datum (NAVD88) Bench Mark Elevation Information In FEET above: Stamping or Designation MLLW MHW HUNTERS POINT BM 2 1917 11.88 5.78 HUNTERS POINT BM 3 1917 12.14 6.04 4 1941 15.33 9.23 5 1941 15.38 9.28 HUNTER WEST 1 1941 11.32 5.22 HUNTER EAST 1941 10.65 4.55
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 PUBLICATION DATE: 06/24/1983 Station ID: 9414358 SUPERCEDED DATE: 04/21/2003 Name: HUNTERS POINT, SAN FRANCISCO BAY CALIFORNIA NOAA Chart: 18649 Latitude: 37° 43.8' N USGS Quad: HUNTERSPOINT Longitude: 122° 21.4' 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 (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 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.