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

                                                                                
Station ID: 8665737                         PUBLICATION DATE:  05/27/2003
Name:       JACKSONBORO CAMP, EDISTO RIVER                    
            SC
NOAA Chart: 11521                           Latitude:   32° 45.2' N (  32.75330)
USGS Quad:  COTTAGEVILLE                    Longitude:  80° 27.0' W ( -80.45000)


To reach the tidal bench marks from the west end of the U.S. Highway 17 bridge
over Edisto River near Jacksonboro, proceed west on U.S. Highway 17 for 0.8 km
(0.5 mi) to State Road S-15-30 in Jacksonboro, turn south onto State Road
S-15-30 and go 1.6 km (1.0 mi) to a dirt road on the left side of the road, turn
left (east) onto the dirt road and go 0.5 km (0.3 mi) to Edisto River.  The
bench marks are along the row of cottages on the river.  The tide gage and staff
were on the wooden sea wall beside a floating dock.


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


                 PRIMARY BENCH MARK STAMPING:  5737 A 1977
                         DESIGNATION:          866 5737 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4226
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   32° 45.2' N (  32.75330)          LONGITUDE:  80° 27.0' W ( -80.45000)


The primary bench mark is a disk crimped to a copper-clad steel rod, located
10.49 m (34.4 ft) SSE of the SE corner of a red house on stilts, 9.75 m (32.0
ft) NNE of the NE corner of a brown house on stilts, 4.02 m (13.2 ft) SW of the
SW corner of a wooden dock, 2.90 m (9.5 ft) west of the river shoreline, and
0.76 m (2.5 ft) north of the north edge of a homemade concrete boat landing. 
The bench mark is 0.03 m (0.1 ft) below ground level, crimped to a copper-clad
steel rod driven 6 m (20 ft) to refusal, and encased in a 4-inch PVC pipe and
concrete kickblock.

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

                                                                                
Station ID: 8665737                         PUBLICATION DATE:  05/27/2003
Name:       JACKSONBORO CAMP, EDISTO RIVER                    
            SC
NOAA Chart: 11521                           Latitude:   32° 45.2' N (  32.75330)
USGS Quad:  COTTAGEVILLE                    Longitude:  80° 27.0' W ( -80.45000)


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


                         BENCH MARK STAMPING:  5737 C 1977
                         DESIGNATION:          866 5737 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4228
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   32° 45.2' N (  32.75330)          LONGITUDE:  80° 27.0' W ( -80.45000)


The bench mark is a disk crimped to a copper-clad steel rod, located near the
dirt road leading to State Road S-15-30, 51.39 m (168.6 ft) north of Bench Mark
5737 G 1982, 19.81 m (65.0 ft) SW of the SW corner of a brown house on stilts,
8.08 m (26.5 ft) west of the metal anchor supporting the guy wire to power pole
#85800, 6.71 m (22.0 ft) ENE of the centerline of the dirt road from State Road
S-15-30, and 1.22 m (4.0 ft) west of power pole #85800.  The bench mark is 0.03
m (0.1 ft) below ground level, crimped to a copper-clad steel rod driven 6 m (20
ft) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  5737 E 1977
                         DESIGNATION:          866 5737 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4230
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK3121
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   32° 45.3' N (  32.75500)          LONGITUDE:  80° 27.0' W ( -80.45000)


The bench mark is a disk crimped to a copper-clad steel rod, located 29.78 m
(97.7 ft) SW of the SW corner of a green house on stilts, 25.91 m (85.0 ft)
north of a tidal canal perpendicular to the river, 15.36 m (50.4 ft) NW of the
NW corner of a white cinderblock house, 13.75 m (45.1 ft) west of the SW corner
of a white shingle house, and 1.46 m (5.0 ft) NE of power pole #175950.  The
bench mark is 0.03 m (0.1 ft) below ground level, crimped to a copper-clad steel
rod driven 4 m (12 ft) to refusal, and encased in a 4-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: 8665737                         PUBLICATION DATE:  05/27/2003
Name:       JACKSONBORO CAMP, EDISTO RIVER                    
            SC
NOAA Chart: 11521                           Latitude:   32° 45.2' N (  32.75330)
USGS Quad:  COTTAGEVILLE                    Longitude:  80° 27.0' W ( -80.45000)


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


                         BENCH MARK STAMPING:  5737 F 1982
                         DESIGNATION:          866 5737 F TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         7482
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   32° 45.2' N (  32.75330)          LONGITUDE:  80° 27.0' W ( -80.45000)


The bench mark is a disk set in a concrete monument 49.74 m (163.2 ft) north of
Bench Mark 5737 C 1977, 34.99 m (114.8 ft) NW of Bench Mark 5737 A 1977, 16.40 m
(53.8 ft) NW of the NW corner of a red house on stilts, 9.94 m (32.6 ft) NNE of
the NE corner of an open boat shed, 3 m (10 ft) SSW of underground cable box
#A39L1L1, 0.73 m (2.4 ft) SSW of power pole #175952, and at ground level.



                         BENCH MARK STAMPING:  5737 G 1982
                         DESIGNATION:          866 5737 G TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         7483
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK3120
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   32° 45.3' N (  32.75500)          LONGITUDE:  80° 27.0' W ( -80.45000)


The bench mark is a disk set in a concrete monument near a green house on
stilts, 41.27 m (135.4 ft) NNE of Bench Mark 5737 E 1977, 15.61 m (51.2 ft) NE
of the NE corner of a green aluminum-sided house, 3.26 m (10.7 ft) east ofthe
centerline of a dirt road, 1.43 m (4.7 ft) north of power pole #175951, and 0.03
m (0.1 ft) below ground level.

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

                                                                                
Station ID: 8665737                         PUBLICATION DATE:  05/27/2003
Name:       JACKSONBORO CAMP, EDISTO RIVER                    
            SC
NOAA Chart: 11521                           Latitude:   32° 45.2' N (  32.75330)
USGS Quad:  COTTAGEVILLE                    Longitude:  80° 27.0' W ( -80.45000)


                            T I D A L   D A T U M S 


Tidal datums at JACKSONBORO CAMP, EDISTO RIVER based on:

     LENGTH OF SERIES:      7 MONTHS
     TIME PERIOD:           June 1978 - December 1978
     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   =  1.353
     MEAN HIGH WATER                            MHW    =  1.289
     MEAN SEA LEVEL                             MSL    =  0.753
     MEAN TIDE LEVEL                            MTL    =  0.674
     North American Vertical Datum              NAVD88 =  0.401
     MEAN LOW WATER                             MLW    =  0.059
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     5737 A 1977                                 1.696    0.407
     5737 C 1977                                 2.097    0.808
     5737 E 1977                                 1.632    0.343
     5737 F 1982                                 1.812    0.523
     5737 G 1982                                 1.776    0.487


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

                                                                                
Station ID: 8665737                         PUBLICATION DATE:  05/27/2003
Name:       JACKSONBORO CAMP, EDISTO RIVER                    
            SC
NOAA Chart: 11521                           Latitude:   32° 45.2' N (  32.75330)
USGS Quad:  COTTAGEVILLE                    Longitude:  80° 27.0' W ( -80.45000)


                             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.