U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 PUBLICATION DATE: 01/04/1985 Station ID: 9415498 SUPERCEDED DATE: 04/21/2003 Name: SUISUN CITY, SUISUN SLOUGH CALIFORNIA NOAA Chart: 18656 Latitude: 38° 14.2' N USGS Quad: FAIRFIELD Longitude: 122° 1.8' W To reach the tidal bench marks proceed along Marina Boulevard in Suisun City to the Suisun-Pacific Marina on the Suisun Slough. The bench marks are located on the marina property. The tide gage and staff were located on the seawall at the marina along Suisun Slough. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 5498 B 1977 MONUMENTATION: Survey Disk VM#: 8691 AGENCY: PID: SETTING CLASSIFICATION: Copper-clad Steel Rod The bench mark is 53.0 feet (16.2 m) SSW from the third light pole in a row extending SSW of the harbor master office, 15.5 feet (4.7 m) WNW of the gate leading to floating deck A, 11.0 feet (3.4 m) SE of a concrete high voltage utility box cover level with the ground, 3.8 feet (1.2 m) west of marina fire hydrant No. 500, and 0.1 foot (0.03 m) below the grade. The bench mark is on a rod driven 60.0 feet (18.3 m), inside a PVC pipe, and 0.4 foot (0.1 m) below the top of the PVC pipe. BENCH MARK STAMPING: 5498 B1 1977 MONUMENTATION: Survey Disk VM#: 8692 AGENCY: PID: SETTING CLASSIFICATION: Concrete Base The bench mark is set in a concrete base of a flagpole at the Suisun-Pacific Marina, in front of the harbor master house, 0.9 foot (0.3 m) east of the flagpole, and flush with the concrete base.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 PUBLICATION DATE: 01/04/1985 Station ID: 9415498 SUPERCEDED DATE: 04/21/2003 Name: SUISUN CITY, SUISUN SLOUGH CALIFORNIA NOAA Chart: 18656 Latitude: 38° 14.2' N USGS Quad: FAIRFIELD Longitude: 122° 1.8' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5498 C 1977 MONUMENTATION: Survey Disk VM#: 8693 AGENCY: PID: SETTING CLASSIFICATION: Copper-clad Steel Rod The bench mark is 91.0 feet (27.7 m) ESE from the east corner of the southwesternmost of 3 sheds, 45.0 feet (13.7 m) NE from the fourth light/power pole of a connected series of poles, 16.9 feet (5.2 m) NNW from the center of the gate leading to floating dock E, and 0.2 foot (0.06 m) below the grade. The bench mark is on a rod driven 54.0 feet (16.5 m), inside a PVC pipe, and 0.8 foot (0.2 m) below the top of the PVC pipe. BENCH MARK STAMPING: 5498 D 1977 MONUMENTATION: Survey Disk VM#: 8694 AGENCY: PID#: AE7864 SETTING CLASSIFICATION: Copper-clad Steel Rod The bench mark is set in the concrete seawall on the NE side of Suisun-Pacific Marina boat ramp, 910.0 feet (277.4 m) east from the north corner of the boat ramp, 16.5 feet (5.0 m) SSE from a lamp post, and flush in the seawall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 PUBLICATION DATE: 01/04/1985 Station ID: 9415498 SUPERCEDED DATE: 04/21/2003 Name: SUISUN CITY, SUISUN SLOUGH CALIFORNIA NOAA Chart: 18656 Latitude: 38° 14.2' N USGS Quad: FAIRFIELD Longitude: 122° 1.8' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5498 E 1977 MONUMENTATION: Survey Disk VM#: 8695 AGENCY: PID: SETTING CLASSIFICATION: Copper-clad Steel Rod The bench mark is 62.5 feet (19.0 m) NE from fire hydrant No. 72 in the Suisun-Pacific subdivision at the intersection of Marina Circle and Marina Drive, 50.0 feet (15.2 m) ENE from the center of the intersection of Marina Circle and Marina Drive, 20.8 feet (6.3 m) SSW from the power pole at the east corner of Marina Circle and Marina Drive, 2.0 feet (0.6 m) NNE from the Marina Circle road sign at the entrance to the marina, and 0.1 foot (0.03 m) above the grade. The bench mark is on a rod driven to 66.0 feet (20 m), inside a PVC pipe and 0.6 foot (0.2 m) below the top of the pipe.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 PUBLICATION DATE: 01/04/1985 Station ID: 9415498 SUPERCEDED DATE: 04/21/2003 Name: SUISUN CITY, SUISUN SLOUGH CALIFORNIA NOAA Chart: 18656 Latitude: 38° 14.2' N USGS Quad: FAIRFIELD Longitude: 122° 1.8' W T I D A L D A T U M S Tidal datums at SUISUN CITY, SUISUN SLOUGH based on: LENGTH OF SERIES: 15 MONTHS TIME PERIOD: APRIL 1977-JUNE 1978 TIDAL EPOCH: 1960-1978 CONTROL TIDE STATION: 9415144 PORT CHICAGO Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET: HIGHEST OBSERVED WATER LEVEL (01/16/1978) = 7.00 MEAN HIGHER HIGH WATER MHHW = 5.15 MEAN HIGH WATER MHW = 4.67 MEAN TIDE LEVEL MTL = 2.68 MEAN LOW WATER MLW = 0.69 MEAN LOWER LOW WATER MLLW = 0.00 LOWEST OBSERVED WATER LEVEL (05/05/1978) = -1.03 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In FEET above: Stamping or Designation MLLW MHW 5498 B 1977 7.91 3.24 5498 B1 1977 8.25 3.58 5498 C 1977 8.23 3.56 5498 D 1977 8.36 3.69 5498 E 1977 4.20 -0.47
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 PUBLICATION DATE: 01/04/1985 Station ID: 9415498 SUPERCEDED DATE: 04/21/2003 Name: SUISUN CITY, SUISUN SLOUGH CALIFORNIA NOAA Chart: 18656 Latitude: 38° 14.2' N USGS Quad: FAIRFIELD Longitude: 122° 1.8' 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.