U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 9415009 PUBLICATION DATE: 04/30/2003 Name: POINT SAN PEDRO, SAN FRANCISCO BAY CA NOAA Chart: 18654 Latitude: 37° 59.6' N ( 37.99330) USGS Quad: SAN QUENTIN Longitude: 122° 26.8' W (-122.44700) To reach the tidal bench marks from San Rafael High School, proceed east on Point San Pedro Road for 5.5 km (3.4 mi) to a road on the south side marked Basalt Rock Company, go down the company road, then under an overpass to a left turn and then follow the road along the shore until it reaches a loading ramp on the north side of a barge pier. The bench marks are on Basalt Rock Compay property along the shore. The tide gauge and staff were on the Basalt Rock Company pier near the boat ramp on San Pablo Strait. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 5009 A 1979 DESIGNATION: 941 5009 A MONUMENTATION: Tidal Station disk VM#: 11809 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Retaining wall OPUS PID#: BBCN53 LATITUDE: 37° 59.4' N ( 37.99000) LONGITUDE: 122° 26.8' W (-122.44700) The primary bench mark is a disk set flush in the north retaining wall of the northernmost barge loading ramp, 274 m (900 ft) north of a hopper structure adjacent to a rock crusher, 18 m (60 ft) west of the pier running parallel to the shore, 5 m (16 ft) north of the centerline of the ramp, 4 m (12 ft) NW of the west edge of a pivoting metal loading ramp, and 0.18 m (0.6 ft) from the edge of the foundation wall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 9415009 PUBLICATION DATE: 04/30/2003 Name: POINT SAN PEDRO, SAN FRANCISCO BAY CA NOAA Chart: 18654 Latitude: 37° 59.6' N ( 37.99330) USGS Quad: SAN QUENTIN Longitude: 122° 26.8' W (-122.44700) T I D A L B E N C H M A R K S BENCH MARK STAMPING: V 551 1956 DESIGNATION: V 551 MONUMENTATION: Bench Mark disk VM#: 11808 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: HT1035 SETTING CLASSIFICATION: Concrete foundation OPUS PID: LATITUDE: 37° 59.1' N ( 37.98500) LONGITUDE: 122° 26.9' W (-122.44800) The bench mark is a disk set flush in the NE corner of a foundation at the west end of the south one of two ruins of old wooden piers, and east of the south one of two old tin buildings along the shore. BENCH MARK STAMPING: 5009 B 1979 DESIGNATION: 941 5009 B MONUMENTATION: Tidal Station disk VM#: 11810 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Foundation wall OPUS PID: LATITUDE: 37° 59.4' N ( 37.99000) LONGITUDE: 122° 26.8' W (-122.44700) The bench mark is a disk set flush in the top of the north foundation wall for a subsurface conveyor running between the crushed rock hopper to the west and a barge loading dock to the east, 91 m (300 ft) NNE of the rock crusher, 27 m (89 ft) NNW of the NW corner of the company office, 8 m (27 ft) west of a cinder block structure leading to the barge dock, and 4 m (13 ft) west of the centerline of a road running north/south along the shore.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 9415009 PUBLICATION DATE: 04/30/2003 Name: POINT SAN PEDRO, SAN FRANCISCO BAY CA NOAA Chart: 18654 Latitude: 37° 59.6' N ( 37.99330) USGS Quad: SAN QUENTIN Longitude: 122° 26.8' W (-122.44700) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5009 C 1979 DESIGNATION: 941 5009 C MONUMENTATION: Tidal Station disk VM#: 11811 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete foundation OPUS PID: LATITUDE: 37° 59.4' N ( 37.99000) LONGITUDE: 122° 26.8' W (-122.44700) The bench mark is a disk set flush in the concrete foundation of the northernmost tin building along the shore, in the SW corner of the east doorway on the north side of the old fish plant building in a loading area extension of the main foundation slab, 69 m (225 ft) SE of the south edge of the east concrete wall forming a truck ramp for the nearby rock crusher, 14 m (46 ft) west of the NE corner of the foundation, 2.90 m (9.5 ft) from the east of the loading area, and 2.19 m (7.2 ft) from the north edge of the foundation. BENCH MARK STAMPING: 5009 D 1979 DESIGNATION: 941 5009 D MONUMENTATION: Tidal Station disk VM#: 11812 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete foundation OPUS PID: LATITUDE: 37° 59.4' N ( 37.99000) LONGITUDE: 122° 26.8' W (-122.44700) The bench mark is a disk set flush in the north corner of a concrete foundation for an employees locker building, 30 m (100 ft) south of an old metal tank adjacent to a group of tin buildings and a large gas storage tank to the east, 20 m (65 ft) SE of the NE corner of an asphalt-making plant, and 0.46 m (1.5 ft) east of the north corner of the building.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 9415009 PUBLICATION DATE: 04/30/2003 Name: POINT SAN PEDRO, SAN FRANCISCO BAY CA NOAA Chart: 18654 Latitude: 37° 59.6' N ( 37.99330) USGS Quad: SAN QUENTIN Longitude: 122° 26.8' W (-122.44700) T I D A L D A T U M S Tidal datums at POINT SAN PEDRO, SAN FRANCISCO BAY based on: LENGTH OF SERIES: 6 MONTHS TIME PERIOD: May 1980 - October 1980 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 9414290 SAN FRANCISCO, SAN FRANCISCO BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 1.789 MEAN HIGH WATER MHW = 1.607 MEAN TIDE LEVEL MTL = 0.964 MEAN SEA LEVEL MSL = 0.936 MEAN LOW WATER MLW = 0.321 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 5009 A 1979 5.445 3.838 V 551 1956 3.337 1.730 5009 B 1979 5.663 4.056 5009 C 1979 3.465 1.858 5009 D 1979 5.341 3.734
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 9415009 PUBLICATION DATE: 04/30/2003 Name: POINT SAN PEDRO, SAN FRANCISCO BAY CA NOAA Chart: 18654 Latitude: 37° 59.6' N ( 37.99330) USGS Quad: SAN QUENTIN Longitude: 122° 26.8' W (-122.44700) 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.