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

                                                                                
Station ID: 8664801                         PUBLICATION DATE:  02/05/2004
Name:       PRICE CREEK                                       
            SC
NOAA Chart: 11521                           Latitude:   32° 52.9' N (  32.88170)
USGS Quad:  SEWEE BAY                       Longitude:  79° 39.5' W ( -79.65830)


To reach the tidal bench marks from a boat landing at Breach Inlet at the south
end of Isle of Palms, proceed by boat north on Hamlin Creek to the Intracoastal
Waterway at black can buoy 117, then proceed NE on the Intracoastal Waterway for
about 16.7 km (10.4 statute mi) to a flashing red light (4 second) on a fixed
structure marked 86, then turn right and go about 2.7 km (1.7 statute mi) SE on
Price Creek to Magwoods dock on the west bank of the creek.  The bench marks are
along the foot path leading from the dock to the Magwood residence.  The tide
gage and staff were at the end of the dock.


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


                 PRIMARY BENCH MARK STAMPING:  MD NO 2 1975
                         DESIGNATION:          866 4801 MD TIDAL 2

MONUMENTATION:           Tidal Station disk                    VM#:         4100
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   32° 52.9' N (  32.88170)          LONGITUDE:  79° 39.5' W ( -79.65830)


The primary bench mark is a disk located along the foot path to the Magwood
residence, 30 m (98 ft) SW of bench mark MD NO 1 1975, 17.01 m (55.8 ft) SW of a
2-inch metal post at the SW corner of a wooden open shed, 2.50 m (8.2 ft) north
of a utility pole, 2.32 m (7.6 ft) SE of the centerline of the path, 2.13 m (7.0
ft) west of a lone myrtle bush, and 0.27 m (0.9 ft) NW of a witness post with
sign.  The bench mark is set 3 cm (0.1 ft) above ground level, crimped to the
top of a copper-clad steel rod driven an unspecified depth to refusal, and
encased in a PVC pipe and concrete kickblock.

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

                                                                                
Station ID: 8664801                         PUBLICATION DATE:  02/05/2004
Name:       PRICE CREEK                                       
            SC
NOAA Chart: 11521                           Latitude:   32° 52.9' N (  32.88170)
USGS Quad:  SEWEE BAY                       Longitude:  79° 39.5' W ( -79.65830)


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


                         BENCH MARK STAMPING:  MD NO 3 1975
                         DESIGNATION:          866 4801 MD TIDAL 3

MONUMENTATION:           Tidal Station disk                    VM#:         4101
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   32° 52.9' N (  32.88170)          LONGITUDE:  79° 39.5' W ( -79.65830)


The bench mark is a disk located a along the foot path to the Magwood residence,
24 m (79 ft) WNW of bench mark MD NO 2 1975, 11.34 m (37.2 ft) ENE of the SE
porch piling of a small cabin, 11.06 m (36.3 ft) NW of a utility pole, 7.41 m
(24.3 ft) east of the northeasternmost of three cedar trees, 5.91 m (19.4 ft)
west of the centerline of the path, and 0.37 m (1.2 ft) NW of a witness post
with sign.  The bench mark is set at ground level, crimped to the top of a
copper-clad steel rod driven an unspecified depth to refusal, and encased in a
PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  MD NO 4 1975
                         DESIGNATION:          866 4801 MD TIDAL 4

MONUMENTATION:           Tidal Station disk                    VM#:         4102
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   32° 52.9' N (  32.88170)          LONGITUDE:  79° 39.5' W ( -79.65830)


The bench mark is a disk located along the foot path to the Magwood residence,
18 m (60 ft) SSW of bench mark MD NO 3 1975, 8.81 m (28.9 ft) NW of the corner
of a wooden fence, 8 m (25 ft) NW of the centerline of the foot path, 1.71 m
(5.6 ft) NE of a 0.46 m (1.5 ft) diameter oak tree, and 0.40 m (1.3 ft) NNW of a
witness post with sign.  The bench mark is set 12 cm (0.4 ft) above ground
level, crimped to the top of a copper-clad steel rod driven an unspecified depth
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  3 of  5

                                                                                
Station ID: 8664801                         PUBLICATION DATE:  02/05/2004
Name:       PRICE CREEK                                       
            SC
NOAA Chart: 11521                           Latitude:   32° 52.9' N (  32.88170)
USGS Quad:  SEWEE BAY                       Longitude:  79° 39.5' W ( -79.65830)


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


                         BENCH MARK STAMPING:  MD NO 5 1975
                         DESIGNATION:          866 4801 MD TIDAL 5

MONUMENTATION:           Tidal Station disk                    VM#:         4103
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   32° 52.9' N (  32.88170)          LONGITUDE:  79° 39.5' W ( -79.65830)


The bench mark is a disk located in the vicinity of the Magwood residence, about
59 m (195 ft) south of bench mark MD NO 4 1975, 8.53 m (28.0 ft) SW of the west
corner of a cabin, 7.74 m (25.4 ft) SE of the SE corner of an old chimney used
as a footing for the house, and 5.55 m (18.2 ft) SSE of a utility pole.  The
bench mark is set 6 cm (0.2 ft) above the ground, crimped to the top of a
copper-clad steel rod driven an unspecified depth to refusal, and encased in a
PVC pipe and concrete kickblock.

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

                                                                                
Station ID: 8664801                         PUBLICATION DATE:  02/05/2004
Name:       PRICE CREEK                                       
            SC
NOAA Chart: 11521                           Latitude:   32° 52.9' N (  32.88170)
USGS Quad:  SEWEE BAY                       Longitude:  79° 39.5' W ( -79.65830)


                            T I D A L   D A T U M S 


Tidal datums at PRICE CREEK based on:

     LENGTH OF SERIES:      9 MONTHS
     TIME PERIOD:           July 1976 - March 1977
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8665530 CHARLESTON, COOPER RIVER ENTRANCE


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

     MEAN HIGHER HIGH WATER                     MHHW   =  1.630
     MEAN HIGH WATER                            MHW    =  1.514
     MEAN SEA LEVEL                             MSL    =  0.792
     MEAN TIDE LEVEL                            MTL    =  0.783
     MEAN LOW WATER                             MLW    =  0.052
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     MD NO 2 1975                                2.182    0.668
     MD NO 3 1975                                2.227    0.713
     MD NO 4 1975                                2.459    0.945
     MD NO 5 1975                                2.197    0.683


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

                                                                                
Station ID: 8664801                         PUBLICATION DATE:  02/05/2004
Name:       PRICE CREEK                                       
            SC
NOAA Chart: 11521                           Latitude:   32° 52.9' N (  32.88170)
USGS Quad:  SEWEE BAY                       Longitude:  79° 39.5' W ( -79.65830)


                             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.