Superseded Bench Mark Sheet for 8639348, Money Point VA

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  6

                                                   PUBLICATION DATE:  07/26/2002
Station ID: 8639348                                SUPERCEDED DATE:   04/21/2003
Name:       MONEY POINT, S. BR. ELIZABETH RIVER               
            VIRGINIA
NOAA Chart: 12253                                  Latitude:         36° 46.7' N
USGS Quad:  NORFOLK SOUTH                          Longitude:        76° 18.1' W


To reach the tidal bench marks from the Post Office in Chesapeake, Virginia,
proceed north on Battlefield Boulevard  for 0.8 km (0.5 mi), then continue west
on Interstate 64 toward Suffolk to Exit 291A for I-664 toward Norfolk, then take
I-664 to Freeman Avenue (Exit 3), turn left at the light and continue south on
Freeman Avenue for 1.1 km (0.7 mi) to Buell Street, then left on Buell Street
for 0.5 km (0.3 mi) to the Elizabeth River Terminal on the right.  The bench
marks are on the terminal property and the tide gage is located on the end of
pier No. 2.


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


                 PRIMARY BENCH MARK STAMPING:  9348 E 1997
                         DESIGNATION:          863 9348 E

MONUMENTATION:           Flange-encased Rod                        VM#:    13895
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Stainless steel rod in sleeve


The primary bench mark is located near an oil storage tank in a grassy area,
60.50 m (198.5 ft) NNE of Warehouse No. 1, 24.29 m (79.7 ft) ESE of the SE
corner of the office/break room, 16.09 m (52.8 ft) south of the SE corner of the
electrical shop, 2.01 m (6.6 ft) NE of a witness post, and 1.80 m (5.9 ft) south
of a telephone pole. The datum point is the top of a stainless steel rod driven
7.6 m (25 ft) to refusal, in a grease-filled sleeve extending to a depth of 0.91
m (3 ft), and encased inside a 5-inch logo cap.



                         BENCH MARK STAMPING:  9348 A 1997
                         DESIGNATION:          863 9348 A

MONUMENTATION:           Tidal Station disk                        VM#:    13896
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Warehouse foundation


The bench mark is a disk set in the concrete foundation on the west side of
Warehouse No. 1, 39.01 m (128.0 ft) NE of the SE corner of Warehouse No. 2,
15.61 m (51.2 ft) SSE of the SE corner of the main switch building, 15.61 m
(51.2 ft) NNW of the inside corner of Warehouse No. 1, 1.10 m (3.6 ft) NE of the
NW corner of Warehouse No. 1, and 0.30 m (1.0 ft) above ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  6

                                                   PUBLICATION DATE:  07/26/2002
Station ID: 8639348                                SUPERCEDED DATE:   04/21/2003
Name:       MONEY POINT, S. BR. ELIZABETH RIVER               
            VIRGINIA
NOAA Chart: 12253                                  Latitude:         36° 46.7' N
USGS Quad:  NORFOLK SOUTH                          Longitude:        76° 18.1' W


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


                         BENCH MARK STAMPING:  9348 B 1997
                         DESIGNATION:          863 9348 B

MONUMENTATION:           Tidal Station disk                        VM#:    13897
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Concrete foundation


The bench mark is a disk set in the concrete foundation of the railroad train
boxcar scale SE of Warehouse No. 6, 43.19 m (141.7 ft) NE of the NE corner of a
warehouse, 41.51 m (136.2 ft) NNE of the NW corner of Warehouse No. 2, 13.41 m
(44.0 ft) NE of the boxcar scale, 13.01 m (42.7 ft) SE of the SE corner of
Warehouse No. 6, and 0.79 m (2.6 ft) SW of the SW corner of the scalehouse
building.



                         BENCH MARK STAMPING:  9348 C 1997
                         DESIGNATION:          863 9348 C

MONUMENTATION:           Tidal Station disk                        VM#:    13898
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Concrete foundation


The bench mark is a disk set in the concrete foundation of the truck scale,
45.99 m (150.9 ft) SW of the SW corner of Warehouse No. 9, 22.40 m (73.5 ft) WNW
of the SW corner of the office/locker room building, 19.69 m (64.6 ft) east of
the NE corner of the mechanic's building, and 1.49 m (4.9 ft) north of the NW
corner of the truck scale building.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  6

                                                   PUBLICATION DATE:  07/26/2002
Station ID: 8639348                                SUPERCEDED DATE:   04/21/2003
Name:       MONEY POINT, S. BR. ELIZABETH RIVER               
            VIRGINIA
NOAA Chart: 12253                                  Latitude:         36° 46.7' N
USGS Quad:  NORFOLK SOUTH                          Longitude:        76° 18.1' W


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


                         BENCH MARK STAMPING:  9348 D 1997
                         DESIGNATION:          863 9348 D

MONUMENTATION:           Flange-encased Rod                        VM#:    13899
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Stainless steel rod in sleeve


The bench mark is located near the Buell Street entrance to the Elizabeth River
Terminal, 30.60 m (100.4 ft) NE of the NE corner of the main office building,
28.80 m (94.5 ft) south of Pratt Street, 12.71 m (41.7 ft) WNW of Buell Street,
and 1.19 m (3.9 ft) SE of a witness post.  The datum point is 0.09 m (0.3 ft)
below ground, being the top of a stainless steel rod driven 7.6 m (25 ft) to
refusal, in a grease-filled sleeve extending to a depth of 0.91 meter (3 ft),
and encased in a 5-inch logo cap.



                         BENCH MARK STAMPING:  DRAW NO 1 1912 1959
                         DESIGNATION:          DRAW RM 1

MONUMENTATION:           Reference Mark disk                       VM#:    13900
AGENCY:                  US Coast & Geodetic Survey (USC&GS)       PID#:  FX0345
SETTING CLASSIFICATION:  Concrete railroad abutment


The bench mark is a disk set in the north edge of the east abutment at the NE
corner of the Norfolk and Western Railway draw bridge (No 7) over the Southern
Branch of the Elizabeth River, next to the U.S. Highway 460/13 Gilmerton Bridge,
28.93 m (94.9 ft) east of the Gilmerton draw span, 1.8 m (6 ft) south of the
north edge of the abutment, 1.10 m (3.6 ft) north of the north rail of the
railroad tracks, and 0.46 m (1.5 ft) below the track.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  6

                                                   PUBLICATION DATE:  07/26/2002
Station ID: 8639348                                SUPERCEDED DATE:   04/21/2003
Name:       MONEY POINT, S. BR. ELIZABETH RIVER               
            VIRGINIA
NOAA Chart: 12253                                  Latitude:         36° 46.7' N
USGS Quad:  NORFOLK SOUTH                          Longitude:        76° 18.1' W


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


                         BENCH MARK STAMPING:  DRAW NO 2 1912 1959
                         DESIGNATION:          DRAW RM 2

MONUMENTATION:           Reference Mark disk                       VM#:    13901
AGENCY:                  US Coast & Geodetic Survey (USC&GS)       PID#:  FX0346
SETTING CLASSIFICATION:  Concrete bridge abutment


The bench mark is a disk set in top of the south end of the back wall of the
east concrete abutment of the Gilmerton Bridge over the Southern Branch of the
Elizabeth River, 18.65 m (61.2 ft) north of the Gilmerton draw span, and 6.55 m
(21.5 ft) south of the centerline of U.S. Highway 460/13.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  6

                                                   PUBLICATION DATE:  07/26/2002
Station ID: 8639348                                SUPERCEDED DATE:   04/21/2003
Name:       MONEY POINT, S. BR. ELIZABETH RIVER               
            VIRGINIA
NOAA Chart: 12253                                  Latitude:         36° 46.7' N
USGS Quad:  NORFOLK SOUTH                          Longitude:        76° 18.1' W


                            T I D A L   D A T U M S 


Tidal datums at MONEY POINT, S. BR. ELIZABETH RIVER based on:

     LENGTH OF SERIES:      4 YEARS
     TIME PERIOD:           December 1997 - November 2001
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8638610 SEWELLS POINT, HAMPTON ROADS


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

     HIGHEST OBSERVED WATER LEVEL (02/05/1998)         =  2.309
     MEAN HIGHER HIGH WATER                     MHHW   =  0.993
     MEAN HIGH WATER                            MHW    =  0.928
     North American Vertical Datum              NAVD88 =  0.673
     MEAN SEA LEVEL                             MSL    =  0.488
     MEAN TIDE LEVEL                            MTL    =  0.485
     MEAN LOW WATER                             MLW    =  0.042
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (01/02/1998)         = -0.696

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     9348 E 1997                                 3.527    2.599
     9348 A 1997                                 3.054    2.126
     9348 B 1997                                 3.089    2.161
     9348 C 1997                                 3.308    2.380
     9348 D 1997                                 2.152    1.224
     DRAW NO 1 1912 1959                         4.263    3.335
     DRAW NO 2 1912 1959                         5.183    4.255


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  6

                                                   PUBLICATION DATE:  07/26/2002
Station ID: 8639348                                SUPERCEDED DATE:   04/21/2003
Name:       MONEY POINT, S. BR. ELIZABETH RIVER               
            VIRGINIA
NOAA Chart: 12253                                  Latitude:         36° 46.7' N
USGS Quad:  NORFOLK SOUTH                          Longitude:        76° 18.1' 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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