Superseded Bench Mark Sheet for 8662071, PAWLEYS INLET, WARDS DOCK SC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:  04/03/1989
Station ID: 8662071                                SUPERCEDED DATE:   04/21/2003
Name:       WARDS DOCK, PAWLEYS INLET                         
            SOUTH CAROLINA
NOAA Chart: 11535                                  Latitude:         33° 24.7' N
USGS Quad:  WAVERLY MILLS                          Longitude:        79°  8.1' W


To reach the tidal bench marks from the intersection of U.S. Highway 17 and
State Road 46 in Pawleys Island, proceed SE on State Road 46 for 0.6 mile (1.0
km) to State Road 10, then SW on State Road 10 for 1.7 miles (2.7 km) to State
Road 481, then SW on State Road 481 for 0.1 mile (0.2 km) to State Road 265. 
The bench marks are along State Roads 10, 481, and 265.  The tide gage and staff
were SSW of the junction of State Roads 481 and 265 at the end of Mr. R. Wards
dock.


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


                 PRIMARY BENCH MARK STAMPING:  WD NO 1 1975

MONUMENTATION:           Survey Disk                               VM#:     3915
AGENCY:                                                            PID#:  DD1422
SETTING CLASSIFICATION:  Copper-clad Steel Rod


The bench mark is on the SW side of State Road 265, south of the junction of
State Roads 481 and 265, 63.3 feet (19.3 m) SSE of the SE pylon of a two-story
frame house (Dudley residence), 41.3 feet (12.6 m) SW of the west corner of a
cinder block support of a frame house (Ward residence), 27.1 feet (8.3 m) SSW of
utility pole #ABB30/28272, 24.4 feet (7.4 m) ESE of the extended centerline of
State Road 481, 13.2 feet (4.0 m) SSW of the centerline of State Road 265, and
4.1 feet (1.2 m) east of power line stub pole #28273.  The bench mark is flush
with the ground, crimped to a copper-clad steel rod driven an unspeci- fied
depth to refusal, and encased in an ABS pipe with concrete kickblock.



                         BENCH MARK STAMPING:  ALLSTON 1962

MONUMENTATION:           Survey Disk                               VM#:     3914
AGENCY:                                                            PID#:  DD2877
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is set in a concrete monument on the NE side of State Road 265,
NW of the junction of State Roads 481 and 265, about 390 feet (119 m) NW of
Bench Mark WD NO 1 1975, 79.5 feet (24.2 m) NW of a utility pole with guy wire,
51.8 feet (15.8 m) ENE of the easternmost corner of the last house on the NE
side of State Road 265, and 11.0 feet (3.4 m) NE of the centerline of State Road
265.

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

                                                   PUBLICATION DATE:  04/03/1989
Station ID: 8662071                                SUPERCEDED DATE:   04/21/2003
Name:       WARDS DOCK, PAWLEYS INLET                         
            SOUTH CAROLINA
NOAA Chart: 11535                                  Latitude:         33° 24.7' N
USGS Quad:  WAVERLY MILLS                          Longitude:        79°  8.1' W


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


                         BENCH MARK STAMPING:  WD NO 2 1975

MONUMENTATION:           Survey Disk                               VM#:     3916
AGENCY:                                                            PID#:  DD1421
SETTING CLASSIFICATION:  Copper-clad Steel Rod


The bench mark is set on the SE side of State Road 481 in the west corner of the
Greyson property, 165 feet (50 m) NE of Bench Mark WD NO 1 1975, 40.7 feet (12.4
m) NW of a twin-trunk magnolia tree, 13.8 feet (4.2 m) SE of the center- line of
State Road 481, 8.2 feet (2.5 m) WSW of the west pylon of the Greyson residence,
and 3.9 feet (1.2 m) north of utility pole #28244/ABBAB1.  The bench mark is
flush with the ground, crimped to a copper-clad steel rod driven an unspecified
depth to refusal, and encased in an ABS pipe with concrete kickblock.



                         BENCH MARK STAMPING:  WD NO 3 1975

MONUMENTATION:           Survey Disk                               VM#:     3917
AGENCY:                                                            PID#:  DD1420
SETTING CLASSIFICATION:  Copper-clad Steel Rod


The bench mark is set in the V west of the junction of State Roads 10 and 481,
71.9 feet (21.9 m) north of the north corner of a ship-shaped house on cinder
block stilts, 48.9 feet (14.9 m) NNE of utility pole #28243 with transformer,
19.4 feet (5.9 m) NW of the centerline of State Road 481, and 16.4 feet (5.0 m)
SSE of the centerline of State Road 10.  The bench mark is flush with the
ground, crimped to a copper-clad steel rod driven an unspecified depth to
refusal, and encased in an ABS pipe with concrete kickblock.

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

                                                   PUBLICATION DATE:  04/03/1989
Station ID: 8662071                                SUPERCEDED DATE:   04/21/2003
Name:       WARDS DOCK, PAWLEYS INLET                         
            SOUTH CAROLINA
NOAA Chart: 11535                                  Latitude:         33° 24.7' N
USGS Quad:  WAVERLY MILLS                          Longitude:        79°  8.1' W


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


                         BENCH MARK STAMPING:  WD NO 4 1975

MONUMENTATION:           Survey Disk                               VM#:     3918
AGENCY:                                                            PID#:  DD1419
SETTING CLASSIFICATION:  Copper-clad Steel Rod


The bench mark is set in the V west of the junction of State Roads 10 and 481,
84.6 feet (25.8 m) NNW of the west pylon of a house with tile siding (rental
#85), 22.8 feet (6.9 m) SE of the centerline of State Road 10, 21.2 feet (6.5 m)
WNW of the centerline of State Road 481, and 18.0 feet (5.5 m) SW of utility
pole #28203.  The bench mark is 0.2 foot (0.1 m) above ground, crimped to a
copper-clad steel rod driven an unspecified depth to refusal, and encased in an
ABS pipe with concrete kickblock.

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

                                                   PUBLICATION DATE:  04/03/1989
Station ID: 8662071                                SUPERCEDED DATE:   04/21/2003
Name:       WARDS DOCK, PAWLEYS INLET                         
            SOUTH CAROLINA
NOAA Chart: 11535                                  Latitude:         33° 24.7' N
USGS Quad:  WAVERLY MILLS                          Longitude:        79°  8.1' W


                            T I D A L   D A T U M S 


Tidal datums at WARDS DOCK, PAWLEYS INLET based on:

     LENGTH OF SERIES:      10 MONTHS
     TIME PERIOD:           DECEMBER 1975-NOVEMBER1976
     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 (08/20/1976)         =   5.51
     MEAN HIGHER HIGH WATER                     MHHW   =   3.77
     MEAN HIGH WATER                            MHW    =   3.47
     MEAN TIDE LEVEL                            MTL    =   1.82
     MEAN LOW WATER                             MLW    =   0.18
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (07/24/1976)         =  -0.62

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     WD NO 1 1975                                6.21      2.74
     ALLSTON 1962                                8.80      5.33
     WD NO 2 1975                                6.70      3.23
     WD NO 3 1975                                7.56      4.09
     WD NO 4 1975                                9.37      5.90


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

                                                   PUBLICATION DATE:  04/03/1989
Station ID: 8662071                                SUPERCEDED DATE:   04/21/2003
Name:       WARDS DOCK, PAWLEYS INLET                         
            SOUTH CAROLINA
NOAA Chart: 11535                                  Latitude:         33° 24.7' N
USGS Quad:  WAVERLY MILLS                          Longitude:        79°  8.1' 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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Products available at 8662071 PAWLEYS INLET, WARDS DOCK, SC