U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 07/18/1984
Station ID: 9415103 SUPERCEDED DATE: 04/21/2003
Name: SUISUN POINT, CARQUINEZ STRAIT
CALIFORNIA
NOAA Chart: 18656 Latitude: 38° 2.1' N
USGS Quad: PORT CHICAGO Longitude: 122° 7.4' W
To reach the tidal bench marks from Highway 4 in Martinez exit at Marina Vista,
turn left, 0.5 miles along road past a biege house on right, then take a right
through a tunnel to Amorco gate. The bench marks are located on the point along
the railroad trucks leading to the strait. The tide gage and staff were located
on the Martinez Amorco wharf.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5103 A 1979
MONUMENTATION: Survey Disk VM#: 8540
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Pad
The bench mark is set in the SW corner of the concrete pad holding the
electrical main CIR A-2 Group C SW RK 268C at Avon 0.1 Company property near the
gas pumping house at the foot of the wharf, near tanks 80-B-30 and 80-B 21, and
24.2 feet (7.4 m) east of the SE corner of tin shed No. 45.
BENCH MARK STAMPING: 5103 B 1979
MONUMENTATION: Survey Disk VM#: 8541
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Wall
The bench mark is set in the northern concrete wall surrounding depressant tank
B-51, 25 feet (7.6 m) south of the centerline of the road, 7.9 feet (2.4 m) west
of pipes alongside the east wall, 4.0 feet (1.2 m) north of heater 4576, and 1.9
feet (0.6 m) west of the corner of the wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 07/18/1984
Station ID: 9415103 SUPERCEDED DATE: 04/21/2003
Name: SUISUN POINT, CARQUINEZ STRAIT
CALIFORNIA
NOAA Chart: 18656 Latitude: 38° 2.1' N
USGS Quad: PORT CHICAGO Longitude: 122° 7.4' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5103 C 1979
MONUMENTATION: Survey Disk VM#: 8542
AGENCY: PID:
SETTING CLASSIFICATION: Galvanized Steel Rod
The bench mark is west across road from tank 80-B-31, 37.4 feet (11.4 m) SW of
the red fire main, 11.5 feet (3.5 m) west of the centerline of the road, and 10
feet (3.0 m) NE of telephone No. A18. The bench mark is set on a rod driven
24.0 feet (7.3 m) to refusal and encased in a PVC pipe extending 0.1 foot (0.03
m) above the grade.
BENCH MARK STAMPING: 5103 D 1979
MONUMENTATION: Survey Disk VM#: 8543
AGENCY: PID:
SETTING CLASSIFICATION: Galvanized Steel Rod
The bench mark is 87.0 feet (26.5 m) south of the southernmost pipe crossing
under the road from tank 80-B-19, 20.3 feet (6.2 m) NE of a telephone pole, and
10.4 feet (3.2 m) west of the centerline of the road. The bench mark is on a
rod driven 29.0 feet (8.8 m) to refusal and encased in a PVC pipe extending 0.3
foot (0.1 m) above the ground.
BENCH MARK STAMPING: 5103 E 1979
MONUMENTATION: Survey Disk VM#: 8544
AGENCY: PID:
SETTING CLASSIFICATION: Galvanized Steel Rod
The bench mark is 34.0 feet (10.4 m) south of pipes under the rod between tanks
80-B-20 and 80-B1, 33.0 feet (10 m) SE of the SE corner of the wooden walkway on
the west side of the rod, and 9.7 feet (0.3 m) east of the centerline in the
paved rod. The bench mark is on a rod driven 21.0 feet (6.4 m) to refusal and
encased ina PVC pipe extending 0.2 foot (0.06 m) above the grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 07/18/1984
Station ID: 9415103 SUPERCEDED DATE: 04/21/2003
Name: SUISUN POINT, CARQUINEZ STRAIT
CALIFORNIA
NOAA Chart: 18656 Latitude: 38° 2.1' N
USGS Quad: PORT CHICAGO Longitude: 122° 7.4' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TIDAL 5 1937
MONUMENTATION: Survey Disk VM#: 8545
AGENCY: PID#: JT0127
SETTING CLASSIFICATION: Concrete Footing
The bench mark is set in the top of the east corner of the NE row of the second
concrete footing, NW of the SE abutment of the bridge over the strait, 1.7 miles
(2.7 km) NE along the Southern Pacific Company railroad from the station at
Martinez, and 75 feet (23 m) below the track.
BENCH MARK STAMPING: G 790 1946
MONUMENTATION: Survey Disk VM#: 8546
AGENCY: PID#: JT0126
SETTING CLASSIFICATION: Concrete Abutment
The bench mark is set in the top of the west corner of the SE concrete abutment
at the SE end of steel trestle railroad bridge 33.31 over the strait, 1.7 miles
(2.7 km) NE along the Southern Pacific Company railroad from the staion at
Martinez, 12 feet (3.7 m) SW of the SW rail of SW track, and 14 feet (4.3 m)
below the track.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 07/18/1984
Station ID: 9415103 SUPERCEDED DATE: 04/21/2003
Name: SUISUN POINT, CARQUINEZ STRAIT
CALIFORNIA
NOAA Chart: 18656 Latitude: 38° 2.1' N
USGS Quad: PORT CHICAGO Longitude: 122° 7.4' W
T I D A L D A T U M S
Tidal datums at SUISUN POINT, CARQUINEZ STRAIT based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: AUGUST-OCTOBER 1979
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 9415144 PORT CHICAGO, CA
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (08/06/1979) = 6.01
MEAN HIGHER HIGH WATER MHHW = 5.16
MEAN HIGH WATER MHW = 4.65
MEAN TIDE LEVEL MTL = 2.73
* NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 2.08
MEAN LOW WATER MLW = 0.81
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (10/29/1979) = -0.44
* NGVD reference based on adjustment of 1956 and NOS levels of 1979.
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
5103 A 1979 48.71 44.06
5103 B 1979 47.78 43.13
5103 C 1979 41.35 36.70
5103 D 1979 41.97 37.32
5103 E 1979 42.05 37.40
TIDAL 5 1937 10.27 5.62
G 790 1946 68.01 63.36
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 07/18/1984
Station ID: 9415103 SUPERCEDED DATE: 04/21/2003
Name: SUISUN POINT, CARQUINEZ STRAIT
CALIFORNIA
NOAA Chart: 18656 Latitude: 38° 2.1' N
USGS Quad: PORT CHICAGO Longitude: 122° 7.4' 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.