U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 9415143 PUBLICATION DATE: 11/23/2010 Name: CROCKETT, CARQUINEZ STRAIT CA NOAA Chart: 18654 Latitude: 38° 3.5' N ( 38.05830) USGS Quad: BENICA Longitude: 122° 13.4' W (-122.22300) To reach the tidal bench marks from Oakland, proceed north on U.S. Highway 80 for 35 km (22 mi) to the City of Crockett, then exit at Crockett Boulevard (Pomona Street) and proceed east for 0.7 km (0.4 mi) to Rolph Avenue, then turn left onto Rolph Avenue and proceed north for 0.5 km (0.3 mi) to the main gate at the California and Hawaiian Sugar Company Plant. The bench marks are located along the railroad tracks and near the sugar plant. The tide gage and staff were located on a piling on the west side of the dock for the sugar plant. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 2 1929 DESIGNATION: 941 5143 TIDAL 2 MONUMENTATION: Tidal Station disk VM#: 8575 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: JT0527 SETTING CLASSIFICATION: Brick wall of building OPUS PID: LATITUDE: 38° 3.4' N ( 38.05670) LONGITUDE: 122° 13.2' W (-122.22000) The primary bench mark is a disk set vertically in the south face of a brick wall of the shop building, near the main gate of the sugar plant, 30 m (100 ft) west of the SW corner of the building, 18 m (60 ft) NE of the lower gate at the entrance to the refinery, 15 m (50 ft) north of the entrance to California and Hawaiian Sugar refinery, 1 m (5 ft) east of the east end of the south entrance, and 0.46 m (1.5 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 9415143 PUBLICATION DATE: 11/23/2010 Name: CROCKETT, CARQUINEZ STRAIT CA NOAA Chart: 18654 Latitude: 38° 3.5' N ( 38.05830) USGS Quad: BENICA Longitude: 122° 13.4' W (-122.22300) T I D A L B E N C H M A R K S BENCH MARK STAMPING: TIDAL 7 1967 DESIGNATION: 941 5143 TIDAL 7 MONUMENTATION: Bench Mark disk VM#: 8576 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: JT0529 SETTING CLASSIFICATION: Brick wall of building OPUS PID: LATITUDE: 38° 3.4' N ( 38.05670) LONGITUDE: 122° 13.2' W (-122.22000) The bench mark is a disk set vertically in the south brick wall of Char House No. 3 filtration house at the California and Hawaiian Sugar refinery, 91 m (300 ft) NE of the lower gate to the refinery, 2.13 m (7.0 ft) east of the center door No. 6, 2.04 m (6.7 ft) west of the SE corner of the building, and 0.79 m (2.6 ft) above the concrete sidewalk.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 9415143 PUBLICATION DATE: 11/23/2010 Name: CROCKETT, CARQUINEZ STRAIT CA NOAA Chart: 18654 Latitude: 38° 3.5' N ( 38.05830) USGS Quad: BENICA Longitude: 122° 13.4' W (-122.22300) T I D A L B E N C H M A R K S BENCH MARK STAMPING: M 1198 1969 DESIGNATION: M 1198 MONUMENTATION: Bench Mark disk VM#: 8577 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: JT0533 SETTING CLASSIFICATION: Concrete pier OPUS PID: LATITUDE: 38° 3.3' N ( 38.05500) LONGITUDE: 122° 13.5' W (-122.22500) The bench mark is a disk set vertically in the north face of the first concrete pier south of the east lanes of the Interstate Highway 80 overpass, 0.5 km (0.3 mi) west along the Southern Pacific Railroad tracks from the refinery dock, 49.56 m (162.6 ft) SW of and across the track from bench mark H.L. MON 33, 17.53 m (57.5 ft) south of the rail of the south track, and 0.55 m (1.8 ft) west of the NE end of the concrete pier.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 9415143 PUBLICATION DATE: 11/23/2010 Name: CROCKETT, CARQUINEZ STRAIT CA NOAA Chart: 18654 Latitude: 38° 3.5' N ( 38.05830) USGS Quad: BENICA Longitude: 122° 13.4' W (-122.22300) T I D A L B E N C H M A R K S BENCH MARK STAMPING: SECTION 6 T2NR3W DESIGNATION: SECTION 6 T2NR3W MONUMENTATION: Survey disk VM#: 8578 AGENCY: Contra Costa County IDB PID#: SETTING CLASSIFICATION: Concrete block OPUS PID: LATITUDE: 38° 3.5' N ( 38.05830) LONGITUDE: 122° 13.4' W (-122.22300) The bench mark is a disk set in a concrete block cube at the corner indicated by the stamping, beneath Interstate Highway 80 northbound lanes of the bridge over Carquinez Strait, and 110 m (361 ft) SW of bench mark M 1198 1969. BENCH MARK STAMPING: H.L. MON 33 DESIGNATION: 941 5143 H.L. MON 33 MONUMENTATION: Survey disk VM#: 8579 AGENCY: US Army Corps of Engineers (USE) IDB PID#: SETTING CLASSIFICATION: Concrete post OPUS PID: LATITUDE: 38° 3.5' N ( 38.05830) LONGITUDE: 122° 13.4' W (-122.22300) The bench mark is a disk set in top of a round concrete post along the shore north of the railroad tracks, west of the west end of the California and Hawaiian Sugar Refinery Company wharf, and 0.61 m (2.0 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 9415143 PUBLICATION DATE: 11/23/2010 Name: CROCKETT, CARQUINEZ STRAIT CA NOAA Chart: 18654 Latitude: 38° 3.5' N ( 38.05830) USGS Quad: BENICA Longitude: 122° 13.4' W (-122.22300) T I D A L B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: TIDAL 3 ALIAS: 3 MONUMENTATION: Nail VM#: 8580 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: JT0526 SETTING CLASSIFICATION: Concrete post OPUS PID: LATITUDE: 38° 3.4' N ( 38.05670) LONGITUDE: 122° 13.2' W (-122.22000) The bench mark is a nail head set in top of a concrete post along the outside of south wall and near the main gate of the California and Hawaiian Sugar Refinery, 16 m (51 ft) east of the gate in the wall, 2 m (7 ft) north of the Southern Pacific Railroad Company side track, 1 m (3 ft) west of the fourth post east of the gate, and 0.06 m (0.2 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 9415143 PUBLICATION DATE: 11/23/2010 Name: CROCKETT, CARQUINEZ STRAIT CA NOAA Chart: 18654 Latitude: 38° 3.5' N ( 38.05830) USGS Quad: BENICA Longitude: 122° 13.4' W (-122.22300) T I D A L D A T U M S Tidal datums at CROCKETT, CARQUINEZ STRAIT based on: LENGTH OF SERIES: 1 YEAR TIME PERIOD: July 1977 - June 1978 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 9415144 PORT CHICAGO, SUISUN BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 1.812 MEAN HIGH WATER MHW = 1.643 MEAN SEA LEVEL MSL = 0.980 MEAN TIDE LEVEL MTL = 0.973 MEAN LOW WATER MLW = 0.303 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum NAVD88 = -0.118 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 2 1929 3.936 2.293 TIDAL 7 1967 4.238 2.595 M 1198 1969 4.046 2.403 SECTION 6 T2NR3W 4.204 2.561 H.L. MON 33 3.769 2.126 TIDAL 3 3.935 2.292 Foot Notes: Bench mark SECTION 6 T2NR3W is based on one differential leveling connection and does not meet the quality control standards of the NOS. Therefore, caution should be used when deriving elevations for this mark.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 9415143 PUBLICATION DATE: 11/23/2010 Name: CROCKETT, CARQUINEZ STRAIT CA NOAA Chart: 18654 Latitude: 38° 3.5' N ( 38.05830) USGS Quad: BENICA Longitude: 122° 13.4' W (-122.22300) 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.