U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  4

                                                   PUBLICATION DATE:  05/18/1988
Station ID: 8668155                                SUPERCEDED DATE:   04/21/2003
Name:       UPPER END, DISTANT ISLAND CREEK                   
            SOUTH CAROLINA
NOAA Chart: 11516                                  Latitude:         32° 24.1' N
USGS Quad:  BEAUFORT                               Longitude:        80° 39.2' W


To reach the tidal bench marks from the intersection of U.S. Highway 21 and Bay
Street in Beaufort, proceed south on U.S. Highway 21 for 0.9 mile (1.4 km) to
Meridian Road (S-7-36), turn right on Meridian Road and go south for 0.75 mile
(1.21 km) to Rue Dubois (a winding dirt road), turn left on Rue Dubois and go
0.55 mile (0.89 km) to another dirt road, turn right on the dirt road and go
0.25 mile (0.40 km) to a fork in the road, take the right fork for 0.25 mile
(0.40 km) to its end.  The bench marks are located along a narrow dirt road
leading to a 75-foot (23 m) long pier on Distant Island Creek. The tide gage and
staff were located at the end of the pier.


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


                 PRIMARY BENCH MARK STAMPING:  8155 A 1979

MONUMENTATION:           Survey Disk                               VM#:     4464
AGENCY:                                                            PID#:  CK2281
SETTING CLASSIFICATION:  Stainless Steel Rod


The bench mark is 359.0 feet (109.4 m) SSE of Bench Mark 8155 B 1979, 39.7 feet
(12.1 m) NNE of the center of a boat landing, 35.1 feet (10.7 m) NNW of the foot
of the pier, and 16.0 feet (4.9 m) SW of the marsh line.  The bench mark is at
ground level, crimped to a stainless steel rod driven 24 feet (7 m) to refusal,
and encased in a 5-inch PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  8155 B 1979

MONUMENTATION:           Survey Disk                               VM#:     4465
AGENCY:                                                            PID#:  CK2282
SETTING CLASSIFICATION:  Stainless Steel Rod


The bench mark is 191.0 feet (58.2 m) SE of Bench Mark 8155 F 1981, 65.9 feet
(20.1 m) south of the pine tree line, 47.0 feet (14.3 m) east of the center-
line of the road leading to the pier, 41.7 feet (12.7 m) north of utility pole
#155796, and 2.2 feet (0.7 m) ESE of a witness post.  The bench mark is at
ground level, crimped to a stainless steel rod driven 27 feet (8 m) to refusal,
and encased in a 5-inch PVC pipe and concrete kickblock.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  4

                                                   PUBLICATION DATE:  05/18/1988
Station ID: 8668155                                SUPERCEDED DATE:   04/21/2003
Name:       UPPER END, DISTANT ISLAND CREEK                   
            SOUTH CAROLINA
NOAA Chart: 11516                                  Latitude:         32° 24.1' N
USGS Quad:  BEAUFORT                               Longitude:        80° 39.2' W


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


                         BENCH MARK STAMPING:  8155 D 1979

MONUMENTATION:           Survey Disk                               VM#:     4466
AGENCY:                                                            PID#:  CK2280
SETTING CLASSIFICATION:  Stainless Steel Rod


The bench mark is 256.0 feet (78.0 m) SSW of Bench Mark 8155 G 1981, 12.6 feet
(3.8 m) WSW of the centerline of the road leading to the pier, 9.0 feet     (2.7
m) NNW of a 0.6-foot (0.2 m) diameter pine tree, and 1.8 feet (0.5 m) SW of a
witness post.  The bench mark is 0.3 foot (0.1 m) above ground level, crimped to
a stainless steel rod driven 24 feet (7 m) to refusal, and encased in a 5-inch
PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  8155 F 1981

MONUMENTATION:           Survey Disk                               VM#:     4467
AGENCY:                                                            PID#:  CK2283
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is 225.5 feet (68.7 m) south of Bench Mark 8155 D 1979, 19.4 feet
(5.9 m) SW of the road leading to the pier, 14.5 feet (4.4 m) south a 2.0-foot
(0.6 m) diameter oak tree, 3.8 feet (1.2 m) ENE of a witness post with sign, 3.5
feet (1.1 m) SSE of a 0.6-foot (0.2 m) diameter pine tree, and at ground level.



                         BENCH MARK STAMPING:  8155 G 1981

MONUMENTATION:           Survey Disk                               VM#:     4468
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is 26.5 feet (8.1 m) NE of the centerline of the road leading to
the pier, 21.9 feet (6.7 m) WSW of the center of a triple trunk oak tree, 5.6
feet (1.7 m) NE of a witness post with sign, 5.2 feet (1.6 m) east of a 1.0-foot
(0.3 m) diameter pine tree, and at ground level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  4

                                                   PUBLICATION DATE:  05/18/1988
Station ID: 8668155                                SUPERCEDED DATE:   04/21/2003
Name:       UPPER END, DISTANT ISLAND CREEK                   
            SOUTH CAROLINA
NOAA Chart: 11516                                  Latitude:         32° 24.1' N
USGS Quad:  BEAUFORT                               Longitude:        80° 39.2' W


                            T I D A L   D A T U M S 


Tidal datums at UPPER END, DISTANT ISLAND CREEK based on:

     LENGTH OF SERIES:      21 MONTHS
     TIME PERIOD:           JULY 1979 - OCTOBER 1981
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8667999 BEAUFORT


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

     HIGHEST OBSERVED WATER LEVEL (09/04/1979)         =  10.96
     MEAN HIGHER HIGH WATER                     MHHW   =   7.49
     MEAN HIGH WATER                            MHW    =   7.13
     MEAN TIDE LEVEL                            MTL    =   3.62
     MEAN LOW WATER                             MLW    =   0.11
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (03/21/1980)         =  -0.50

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     8155 A 1979                                 9.03      1.90
     8155 B 1979                                 8.63      1.50
     8155 D 1979                                10.83      3.70
     8155 F 1981                                 9.82      2.69
     8155 G 1981                                 9.74      2.61


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

                                                   PUBLICATION DATE:  05/18/1988
Station ID: 8668155                                SUPERCEDED DATE:   04/21/2003
Name:       UPPER END, DISTANT ISLAND CREEK                   
            SOUTH CAROLINA
NOAA Chart: 11516                                  Latitude:         32° 24.1' N
USGS Quad:  BEAUFORT                               Longitude:        80° 39.2' 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.