Superseded Bench Mark Sheet for 8664662, Army Depot SC

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  5

                                                   PUBLICATION DATE:  11/08/1990
Station ID: 8664662                                SUPERCEDED DATE:   04/21/2003
Name:       ARMY DEPOT, COOPER RIVER                          
            SOUTH CAROLINA
NOAA Chart: 11527                                  Latitude:         32° 54.7' N
USGS Quad:  NORTH CHARLESTON                       Longitude:        79° 57.2' W


To reach the tidal bench marks from the intersection of U.S. Highway 52 (Rivers
Avenue) and Remount Road in North Charleston, proceed east on Remount Road for
2.7 miles (4.3 km) to the entrance to U.S. Army Charleston Storage Activity
(TROSCOM), turn left and go through the guard gate on 9th Street to Avenue A,
turn right onto Avenue A and go 0.6 mile (1.0 km) to Perimeter Road, turn right
onto Perimeter Road and go 0.2 mile (0.3 km) to Dock Road, turn left onto Dock
Road and go 0.6 mile (1.0 km) to Basin Road, turn left onto Basin Road and go NE
to the Goose Creek wood pier just past the sharp bend in the road.  The bench
marks are along Basin Street and in the area around the concrete pier.  The tide
gage and staff were on the west end of the Goose Creek wood pier.


                         T I D A L   B E N C H   M A R K S


                 PRIMARY BENCH MARK STAMPING:  CREEK 1976

MONUMENTATION:           Survey Disk                               VM#:     4082
AGENCY:                                                            PID#:  CJ1477
SETTING CLASSIFICATION:  Concrete Pier


The bench mark is set flush in the NE end of the concrete pier, 40.1 feet (12.2
m) south of the NW edge of the pier, 11.7 feet (3.6 m) south of fire hydrant
#855, 6.0 feet (1.8 m) north of the NE edge of the pier, and 1.4 feet (0.4 m) SE
of the SE railroad track.



                         BENCH MARK STAMPING:  NO 4 1942

MONUMENTATION:           Survey Disk                               VM#:     4080
AGENCY:                                                            PID#:  CJ0217
SETTING CLASSIFICATION:  Concrete Pier


The bench mark is set flush in the SW end of the concrete pier, 41.5 feet (12.6
m) SE of a light pole, 4.0 feet (1.2 m) NNW of the SE corner of the pier, and
3.0 feet (0.9 m) NNE of the south corner of the pier.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  5

                                                   PUBLICATION DATE:  11/08/1990
Station ID: 8664662                                SUPERCEDED DATE:   04/21/2003
Name:       ARMY DEPOT, COOPER RIVER                          
            SOUTH CAROLINA
NOAA Chart: 11527                                  Latitude:         32° 54.7' N
USGS Quad:  NORTH CHARLESTON                       Longitude:        79° 57.2' W


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  4662 C 1976

MONUMENTATION:           Survey Disk                               VM#:     4081
AGENCY:                                                            PID#:  CJ1476
SETTING CLASSIFICATION:  Copper-clad Steel Rod


The bench mark is at the gate in the fence separating the Army Depot and the
Port Terminal properties, 46.8 feet (14.3 m) NW of the steps at the SW end of
the concrete pier, 30.8 feet (9.4 m) SE of a pipeline, 8.0 feet (2.4 m) from a
metal witness post and sign, and 4.8 feet (1.5 m) NNE of the wire fence gate. 
The bench mark is level with the ground, crimped to a copper-clad steel rod
driven 40 feet (12 m) to refusal, and encased in a PVC pipe and concrete
kickblock.



                         BENCH MARK STAMPING:  4662 E 1987

MONUMENTATION:           Survey Disk                               VM#:     4083
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Copper-clad Steel Rod


The bench mark is at the base of building #838 near the intersection of Dock and
Basin Roads, 77.0 feet (23.5 m) east of the centerline of Dock Road, 69.0 feet
(21.0 m) NNW of power pole #3901, 40.0 feet (12.2 m) NNW of the center- line of
Basin Road, and 4.0 feet (1.2 m) ENE of building #838.  The bench mark is 2.4
feet (0.7 m) below the ground, crimped to a copper-clad steel rod driven 22 feet
(7 m) to refusal, and encased in a 4-inch PVC pipe with a plug and concrete
kickblock.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  5

                                                   PUBLICATION DATE:  11/08/1990
Station ID: 8664662                                SUPERCEDED DATE:   04/21/2003
Name:       ARMY DEPOT, COOPER RIVER                          
            SOUTH CAROLINA
NOAA Chart: 11527                                  Latitude:         32° 54.7' N
USGS Quad:  NORTH CHARLESTON                       Longitude:        79° 57.2' W


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  WPNSTA 24

MONUMENTATION:           Survey Disk                               VM#:     4084
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is at the NE corner of the intersection of Dock and Basin Roads,
69.3 feet (21.1 m) SSE of the SW corner of Buillding #838, 64.4 feet (19.6 m)
NNW of the NE corner of a loading dock ramp, 62.3 feet (19.0 m) SW of power pole
#3901, 28.8 feet (8.8 m) ENE of the centerline of Dock Road, and 0.8 foot (0.2
m) below the ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  5

                                                   PUBLICATION DATE:  11/08/1990
Station ID: 8664662                                SUPERCEDED DATE:   04/21/2003
Name:       ARMY DEPOT, COOPER RIVER                          
            SOUTH CAROLINA
NOAA Chart: 11527                                  Latitude:         32° 54.7' N
USGS Quad:  NORTH CHARLESTON                       Longitude:        79° 57.2' W


                            T I D A L   D A T U M S 


Tidal datums at ARMY DEPOT, COOPER RIVER based on:

     LENGTH OF SERIES:      25 MONTHS
     TIME PERIOD:           JUNE 1987-FEBRUARY 1990
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8665530 CHARLESTON


Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:

     HIGHEST OBSERVED WATER LEVEL (09/22/1989)         =  10.58
     MEAN HIGHER HIGH WATER                     MHHW   =   5.96
     MEAN HIGH WATER                            MHW    =   5.65
     MEAN TIDE LEVEL                            MTL    =   2.92
     MEAN LOW WATER                             MLW    =   0.19
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (12/21/1976)         =  -2.84

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     CREEK 1976                                 11.77      6.12
     NO 4 1942                                  11.79      6.14
     4662 C 1976                                 7.52      1.87
     4662 E 1987                                 6.71      1.06
     WPNSTA 24                                   7.32      1.67


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  5

                                                   PUBLICATION DATE:  11/08/1990
Station ID: 8664662                                SUPERCEDED DATE:   04/21/2003
Name:       ARMY DEPOT, COOPER RIVER                          
            SOUTH CAROLINA
NOAA Chart: 11527                                  Latitude:         32° 54.7' N
USGS Quad:  NORTH CHARLESTON                       Longitude:        79° 57.2' 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.

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