Bench Mark Sheet for 8638017, FORT EUSTIS (MARAD), JAMES RIVER VA

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

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

                                                                                
Station ID: 8638017                         PUBLICATION DATE:  01/04/2011
Name:       MARAD (FORT EUSTIS)                               
            VA
NOAA Chart: 12248                           Latitude:   37°  8.3' N (  37.13822)
USGS Quad:  YORKTOWN                        Longitude:  76° 37.4' W ( -76.62275)


To reach the station from the Fort Eustis base headquarters, go1.4 km ( 0.9 mi)
SW along Washington boulevard, then 0.4 km (0.25 mi) NW along Taylor avenue,
then 1.4 km  (0.9 mi) SW along Mulberry Island Road, then 0.6 km (0.4 mi) NW
along back river road, then 1.4 km (0.9 mi) SW along Harrison Road, to the
station straight ahead. The bench marks are located near the U.S. Maritime
Commision Facilities building.           


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


                 PRIMARY BENCH MARK STAMPING:  8017 B 2010
                         DESIGNATION:          863 8017 B

MONUMENTATION:           Flange-encased Rod                    VM#:        19810
AGENCY:                  U.S. Army Corps of Engineers (USACE)  IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod in sleeve         OPUS PID#: BBBZ69
LATITUDE:   37°  8.3' N (  37.13903)          LONGITUDE:  76° 37.3' W ( -76.62236)


The benchmark is a flange-encased rod located west of the parking area for
building 2612 and south of the perimeter fence, 17.52 m (57.5 ft) NW of the NW
corner of building 2612, 14.11 m (46.3 ft) north of the NW corner of concrete
pad-transformer M2130BK51, 13.80 m (45.3 ft) WSW of the west corner of generator
switch box, and 3.5 m (11.5 ft) south of angle point in perimeter fence. The
datum point being the top of a stainless steel rod driven 17 m (55.8 ft) to
refusal with concrete kick block and a 5-inch logo cap.

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

                                                                                
Station ID: 8638017                         PUBLICATION DATE:  01/04/2011
Name:       MARAD (FORT EUSTIS)                               
            VA
NOAA Chart: 12248                           Latitude:   37°  8.3' N (  37.13822)
USGS Quad:  YORKTOWN                        Longitude:  76° 37.4' W ( -76.62275)


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


                         BENCH MARK STAMPING:  8017 A 2010
                         DESIGNATION:          863 8017 A

MONUMENTATION:           Tidal Station disk                    VM#:        19809
AGENCY:                  U.S. Army Corps of Engineers (USACE)  IDB PID#:        
SETTING CLASSIFICATION:  Concrete Wall                         OPUS PID:        
LATITUDE:   37°  8.3' N (  37.13836)          LONGITUDE:  76° 37.4' W ( -76.62292)


The benchmark is a disk set on the top of a 0.22 m (0.7 ft) high concrete wall
on the north edge of the pier on the concrete pier extending from the reserve
fleet administration building number 2606, 26.31 m (86.3 ft) SW of the NW corner
of building 2606, 18.60 m (61.0 ft) west of the SW corner of building 2606, 1.46
m (4.8 ft) south of the south face of a steel bulkhead, and 0.36 m (1.2 ft) east
of an aluminum lamp post.

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

                                                                                
Station ID: 8638017                         PUBLICATION DATE:  01/04/2011
Name:       MARAD (FORT EUSTIS)                               
            VA
NOAA Chart: 12248                           Latitude:   37°  8.3' N (  37.13822)
USGS Quad:  YORKTOWN                        Longitude:  76° 37.4' W ( -76.62275)


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


                         BENCH MARK STAMPING:  L 313 1952
                         DESIGNATION:          L 313

MONUMENTATION:           Tidal Station disk                    VM#:        19811
AGENCY:                  U.S. Corps of Engineers               IDB PID#:  GV0559
SETTING CLASSIFICATION:  Concrete apron                        OPUS PID:        
LATITUDE:   37°  8.3' N (  37.13793)          LONGITUDE:  76° 37.3' W ( -76.62202)


The benchmark is a disk set  on the top of the SW corner of a concrete apron on
the west side of a drainage pit, 84.4 m (277 ft) south of the centerline of
Harrison Road, 33.2 m (109 ft) south of the SW corner of the office supply
building, 8.8 m (29 ft) SW of the SW corner of a garage, 12 m (39.5 ft) west of
a 38.1 cm (15 in) pine tree.



                         BENCH MARK STAMPING:  RAD
                         DESIGNATION:          863 8017 RAD

MONUMENTATION:           Bench Mark disk                       VM#:        19812
AGENCY:                  U.S. Corps of Engineers (USACOE)      IDB PID#:        
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   37°  8.3' N (  37.13825)          LONGITUDE:  76° 37.3' W ( -76.62230)


The benchmark is a disk set in a 1.5 m (4.9 ft)  concrete monument, 11.61 m
(38.1 ft) SW of the MW corner of building 2607, 8.90 m (29.2 ft) NW of the SW
corner of building 2607, 7.05 m (23.1 ft) south of the SW corner of building
2614, and 6.96 m (22.8 ft) east of flagpole base.  



                         BENCH MARK STAMPING:  W 454 1971
                         DESIGNATION:           W 454

MONUMENTATION:           Tidal Station disk                    VM#:        19813
AGENCY:                  U.S. Army Corps of Engineer           IDB PID#:  GV0556
SETTING CLASSIFICATION:  Metal rod with a base plate
                         buried/screwed                        OPUS PID:        
LATITUDE:   37°  8.5' N (  37.14235)          LONGITUDE:  76° 37.1' W ( -76.61855)


The benchmark is a disk located 13.9 m (45.5 ft) SE of the center line of
Harrison Road, 13.7 m (45 ft) SW of the centerline of a dirt road, 17.1 m (56
ft) south of the center of the junction of Harrison Road and a dirt road,7.2 m
(23.5 ft) south of power line pole 26-1 bearing a transformer and breaker box,
3.5 m (11.5 ft) NW of a .30 m (1 ft) box elder tree, and 0.5 m (1.5 ft) SE of a
metal witness post. The bench mark is set 7 cm (0.2 ft)) below grade, crimped to
a 1.2 m (4 ft) copper coated steel rod attached to a metal base plate and
encased in a 6 inch concrete pipe.

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

                                                                                
Station ID: 8638017                         PUBLICATION DATE:  01/04/2011
Name:       MARAD (FORT EUSTIS)                               
            VA
NOAA Chart: 12248                           Latitude:   37°  8.3' N (  37.13822)
USGS Quad:  YORKTOWN                        Longitude:  76° 37.4' W ( -76.62275)


                            T I D A L   D A T U M S 


Tidal datums at MARAD (FORT EUSTIS) based on:

     LENGTH OF SERIES:      2 MONTHS
     TIME PERIOD:           August 2010 - September 2010
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8638610 SEWELLS POINT, HAMPTON ROADS


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.769
     MEAN HIGH WATER                            MHW    =  0.715
     MEAN SEA LEVEL                             MSL    =  0.390
     MEAN TIDE LEVEL                            MTL    =  0.381
     MEAN LOW WATER                             MLW    =  0.047
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     8017 B 2010                                 2.266    1.551
     8017 A 2010                                 1.958    1.243
     L 313 1952                                  1.802    1.087
     RAD                                         2.243    1.528
     W 454 1971                                  2.574    1.859


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

                                                                                
Station ID: 8638017                         PUBLICATION DATE:  01/04/2011
Name:       MARAD (FORT EUSTIS)                               
            VA
NOAA Chart: 12248                           Latitude:   37°  8.3' N (  37.13822)
USGS Quad:  YORKTOWN                        Longitude:  76° 37.4' W ( -76.62275)


                             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.

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