Superseded Bench Mark Sheet for 8728694, WHITE BEACH, EAST BAY

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:  06/26/1985
Station ID: 8728694                                SUPERCEDED DATE:   04/21/2003
Name:       WHITE BEACH, EAST BAY                             
            FLORIDA
NOAA Chart: 11404                                  Latitude:         29° 47.1' N
USGS Quad:  BEVERLY                                Longitude:        84° 53.8' W


To reach the tidal bench marks from the intersection of U.S. Highway 98 and
State Road SR 65 proceed 8.6 miles (13.8 km) west on SR 65 to its intersection
with a dirt road on the left, turn left and proceed 2.9 miles (4.6 km) south to
the end of the road and a primitive boat ramp.  The bench marks are located
between the marsh grass and the shore, in the area along the shoreline.  The
tide gage and staff were located on a H structure in East Bay, 300 feet (91 m)
offshore visible for about 0.5 mile (0.8 km) when approaching.


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


                 PRIMARY BENCH MARK STAMPING:  8694 B 1978

MONUMENTATION:           Survey Disk                               VM#:     9864
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Copper-clad Rod


The bench mark is 221 feet (67.4 m) east of Bench Mark 8694 A 1978 CLB, 215 feet
(66 m) west of Bench Mark 8694 C 1978 CLB, 17.5 feet (5.3 m) north of the
apparent shoreline, 7.0 feet (2.1 m) NW of a 1.2-foot (0.4 m) diameter cabbage
palm, and 3.8 feet (1.2 m) south of a metal witness post.  The bench mark is
crimped to the top of a copper-clad steel rod driven 48 feet (15 m) to refusal,
and encased in a PVC pipe and concrete kickblock, projecting 0.4 foot (0.1 m).



                         BENCH MARK STAMPING:  8694 A 1978 CLB

MONUMENTATION:           Survey Disk                               VM#:     9863
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Post


The bench mark is set in a concrete post recessed 0.8 foot (0.2 m), 221 feet (67
m) west of Bench Mark 8694 B 1978, 32.6 feet (9.9 m) SSW of a 2-foot (0.6 m)
cabbage palm, 9.5 feet (2.9 m) NNE of the apparent shoreline, and 3.9 feet (1.2
m) SW of a metal witness post.

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

                                                   PUBLICATION DATE:  06/26/1985
Station ID: 8728694                                SUPERCEDED DATE:   04/21/2003
Name:       WHITE BEACH, EAST BAY                             
            FLORIDA
NOAA Chart: 11404                                  Latitude:         29° 47.1' N
USGS Quad:  BEVERLY                                Longitude:        84° 53.8' W


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


                         BENCH MARK STAMPING:  8694 C 1978 CLB

MONUMENTATION:           Survey Disk                               VM#:     9865
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Post


The bench mark is set in a concrete post recessed 0.8 foot (0.2 m), 215 feet (66
m) east of Bench Mark 8694 B 1978, 206 feet (63 m) west of Bench Mark 8694 D
1978, 38.5 feet (11.7 m) east of a 0.6-foot (0.2 m) diameter cypress tree, 22.2
feet (6.8 m) NW of a 1.2-foot (0.4 m) diameter oak tree, and 6 feet (2 m) south
of a metal witness post.



                         BENCH MARK STAMPING:  8694 D 1978

MONUMENTATION:           Survey Disk                               VM#:     9866
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Copper-clad Rod


The bench mark is 250 feet (76 m) WSW of Bench Mark 8694 E 1978 CLB, 206 feet
(63 m) east of Bench Mark 8694 C 1978 CLB, 25.5 feet (7.8 m) NNE of the apparent
shoreline, 18.1 feet (5.5 m) west of a 0.8-foot (0.2 m) diameter cabbage palm,
and 3.1 feet (0.9 m) SW of a metal witness post.  The bench mark is crimped to
the top of a copper-clad steel rod driven 48 feet (15 m) to refusal, and encased
in a PVC pipe and concrete kickblock, projecting 0.5 foot (0.2 m).

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

                                                   PUBLICATION DATE:  06/26/1985
Station ID: 8728694                                SUPERCEDED DATE:   04/21/2003
Name:       WHITE BEACH, EAST BAY                             
            FLORIDA
NOAA Chart: 11404                                  Latitude:         29° 47.1' N
USGS Quad:  BEVERLY                                Longitude:        84° 53.8' W


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


                         BENCH MARK STAMPING:  8694 E 1978 CLB

MONUMENTATION:           Survey Disk                               VM#:     9867
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Post


The bench mark is set on a concrete post recessed 1 foot (0.3 m), 250 feet (76
m) ENE of Bench Mark 8694 D 1978, 28.5 feet (8.7 m) north of the apparent
shoreline, 28.5 feet (8.7 m) NW of a multiple-trunked oak tree, 17.5 feet (5.3
m) west of an 1.5-foot (0.5 m) diameter cabbage palm, and 4 feet (1 m) west of a
metal witness post.

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

                                                   PUBLICATION DATE:  06/26/1985
Station ID: 8728694                                SUPERCEDED DATE:   04/21/2003
Name:       WHITE BEACH, EAST BAY                             
            FLORIDA
NOAA Chart: 11404                                  Latitude:         29° 47.1' N
USGS Quad:  BEVERLY                                Longitude:        84° 53.8' W


                            T I D A L   D A T U M S 


Tidal datums at WHITE BEACH, EAST BAY based on:

     LENGTH OF SERIES:      3 MONTHS
     TIME PERIOD:           OCTOBER-DECEMBER 1978
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8728360 TURKEY POINT


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

     HIGHEST OBSERVED WATER LEVEL (09/04/1983)         =   3.50
     MEAN HIGHER HIGH WATER                     MHHW   =   2.01
     MEAN HIGH WATER                            MHW    =   1.83
     MEAN TIDE LEVEL                            MTL    =   1.20
     MEAN LOW WATER                             MLW    =   0.58
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (02/29/1984)         =  -1.74



Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     8694 B 1978                                 4.18      2.35
     8694 A 1978 CLB                             2.96      1.13
     8694 C 1978 CLB                             4.44      2.61
     8694 D 1978                                 3.98      2.15
     8694 E 1978 CLB                             3.95      2.12


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

                                                   PUBLICATION DATE:  06/26/1985
Station ID: 8728694                                SUPERCEDED DATE:   04/21/2003
Name:       WHITE BEACH, EAST BAY                             
            FLORIDA
NOAA Chart: 11404                                  Latitude:         29° 47.1' N
USGS Quad:  BEVERLY                                Longitude:        84° 53.8' 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.

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