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

                                                                                
Station ID: 8668482                                PUBLICATION DATE:  02/05/2004
Name:       BAILEYS LANDING, OKATEE RIVER                     
            SOUTH CAROLINA
NOAA Chart: 11513                                  Latitude:         32° 20.8' N
USGS Quad:  JASPER                                 Longitude:        80° 53.4' W


To reach the tidal bench marks from the south end of Broad River Bridge, proceed
SE on State Highway 170 for 8.7 km (5.4 mi) to County Road S-7-18 (Old Baileys
Road), then turn left and proceed south and west on County Road S-7-18 for 2.7
km (1.7 mi) to a dirt driveway on the left leading to the Nimmer residence, then
turn left and proceed 0.2 km (0.1 mi) to the Nimmer residence.  The bench marks
are located on the river bluff behind the house, and along the county road.  The
tide gage and staff were located on the dock behind the house.


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


                 PRIMARY BENCH MARK STAMPING:  NO 3
                         DESIGNATION:          866 8482 TIDAL 3

MONUMENTATION:           Tidal Station disk                        VM#:     4490
AGENCY:                  US Coast and Geodetic Survey (USC&GS)     PID#:  CK0820
SETTING CLASSIFICATION:  Tile pipe surrounded by concrete


The primary bench mark is a disk set flush in a tile pipe surrounded by
concrete, located near the river bluff, 24 m (79 ft) east of bench mark NO 5
1973, 17.89 m (58.7 ft) SE of the SE corner of the Nimmer residence, 14.72 m
(48.3 ft) SW of the NW corner of the Hightown residence, 12 m (39 ft) NE of the
river bluff, and 10.36 m (34.0 ft) west of the SW corner of the Hightown
residence.



                         BENCH MARK STAMPING:  NO 5 1973
                         DESIGNATION:          866 8482 TIDAL 5
                         ALIAS:                 

MONUMENTATION:           Tidal Station disk                        VM#:     4491
AGENCY:                  US Coast and Geodetic Survey (USC&GS)     PID:         
SETTING CLASSIFICATION:  Concrete post


The bench mark is a disk set flush in concrete near the dock, 24 m (79 ft) west
of bench mark NO 3, 20.73 m (68.0 ft) SE of the brick support stairway of the
Nimmer residence, 14.30 m (46.9 ft) SW of the SE corner of the residence, 2.32 m
(7.6 ft) east of the concrete walkway to the dock, 0.61 m (2.0 ft) north of the
river bluff, and at ground level.  NOTE: The mark is badly scarred and the "N"
is obliterated from the original stamping.

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

                                                                                
Station ID: 8668482                                PUBLICATION DATE:  02/05/2004
Name:       BAILEYS LANDING, OKATEE RIVER                     
            SOUTH CAROLINA
NOAA Chart: 11513                                  Latitude:         32° 20.8' N
USGS Quad:  JASPER                                 Longitude:        80° 53.4' W


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


                         BENCH MARK STAMPING:  8482 D 1978
                         DESIGNATION:          866 8482 D TIDAL

MONUMENTATION:           Tidal Station disk                        VM#:     4492
AGENCY:                  National Ocean Survey (NOS)               PID#:  CK2144
SETTING CLASSIFICATION:  Galvanized steel rod


The bench mark is a disk located beside the dirt driveway just west of the
Nimmer driveway, 102.72 m (337.0 ft) NNW of bench mark NO 3, 84 m (276 ft) SE of
bench mark 8482 E 1978, 10.52 m (34.5 ft) south of the centerline of County Road
S-7-18, 8.53 m (28.0 ft) north of a 0.61 m (2.0 ft) diameter oak tree, and 3.66
m (12.0 ft) east of the centerline of a dirt driveway.  The bench mark is set at
ground level, crimped to the top of a galvanized steel rod driven 7.0 m (23 ft)
to refusal, and encased in a PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  8482 E 1978
                         DESIGNATION:          866 8482 E TIDAL

MONUMENTATION:           Tidal Station disk                        VM#:     4493
AGENCY:                  National Ocean Survey (NOS)               PID#:  CK2143
SETTING CLASSIFICATION:  Galvanized steel rod


The bench mark is a disk located along the county road west of bench mark 8482 D
1978 near a white concrete driveway marker, 91.44 m (300.0 ft) north of bench
mark Pinckney No 4 1957, 23.77 m (78.0 ft) north of a multi-trunk oak tree, 9.30
m (30.5 ft) north of telephone junction box #RP6R3, 8.38 m (27.5 ft) west of the
centerline of the road, 5.18 m (17.0 ft) east of the corner of a wire mesh
fence, and 5.18 m (17.0 ft) south of a dirt driveway to the Okatee River
Estates.  The bench mark is set at ground level, crimped to the top of a
galvanized steel rod driven 9.8 m (32 ft) 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  3 of  5

                                                                                
Station ID: 8668482                                PUBLICATION DATE:  02/05/2004
Name:       BAILEYS LANDING, OKATEE RIVER                     
            SOUTH CAROLINA
NOAA Chart: 11513                                  Latitude:         32° 20.8' N
USGS Quad:  JASPER                                 Longitude:        80° 53.4' W


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


                         BENCH MARK STAMPING:  8482 F 1978
                         DESIGNATION:          866 8482 F TIDAL

MONUMENTATION:           Tidal Station disk                        VM#:     4494
AGENCY:                  National Ocean Survey (NOS)               PID#:  CK2142
SETTING CLASSIFICATION:  Galvanized steel rod


The bench mark is a disk located near an old pecan orchard 0.2 km (0.1 mi) west
of the Nimmer driveway, 95.71 m (314.0 ft) north of bench mark 8482 E 1978, 10 m
(33 ft) south of the centerline of a dirt driveway, 9.75 m (32.0 ft) west of the
centerline of the county road, and 2.44 m (8.0 ft) south of a 0.61 m (2.0 ft)
diameter pecan tree.  The bench mark is set at ground level, crimped to the top
of a galvanized steel rod driven 7.0 m (23 ft) to refusal, and encased in a PVC
pipe and concrete kickblock.



                         BENCH MARK STAMPING:  PINCKNEY NO 4 1957
                         DESIGNATION:          PINCKNEY RM 4

MONUMENTATION:           Reference Mark disk                       VM#:     4495
AGENCY:                  US Coast and Geodetic Survey (USC&GS)     PID#:  CK0816
SETTING CLASSIFICATION:  Concrete monument


The bench mark is a disk located along the west bend in County Road S-7-18,
91.44 m (300.0 ft) south of bench mark 8482 E 1978, 12.19 m (40.0 ft) east of
the centerline of a dirt driveway leading to a pond dike, 4.27 m (14.0 ft) west
of a wire mesh fence, 1.28 m (4.2 ft) north of a 4-foot (1.2 m) diameter live
oak tree, and 0.06 m (0.2 ft) above ground level.

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

                                                                                
Station ID: 8668482                                PUBLICATION DATE:  02/05/2004
Name:       BAILEYS LANDING, OKATEE RIVER                     
            SOUTH CAROLINA
NOAA Chart: 11513                                  Latitude:         32° 20.8' N
USGS Quad:  JASPER                                 Longitude:        80° 53.4' W


                            T I D A L   D A T U M S 


Tidal datums at BAILEYS LANDING, OKATEE RIVER based on:

     LENGTH OF SERIES:      1 YEAR
     TIME PERIOD:           March 1978 - February 1979
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8667999 BEAUFORT


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

     HIGHEST OBSERVED WATER LEVEL (07/19/1978)         =  3.262
     MEAN HIGHER HIGH WATER                     MHHW   =  2.663
     MEAN HIGH WATER                            MHW    =  2.536
     North American Vertical Datum              NAVD88 =  1.461
     MEAN SEA LEVEL                             MSL    =  1.439
     MEAN TIDE LEVEL                            MTL    =  1.304
     MEAN LOW WATER                             MLW    =  0.071
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (01/29/1979)         = -0.935

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     NO 3                                        7.831    5.295
     NO 5 1973                                   7.881    5.345
     8482 D 1978                                 7.820    5.284
     8482 E 1978                                 7.924    5.388
     8482 F 1978                                 7.788    5.252
     PINCKNEY NO 4 1957                          7.550    5.014


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

                                                                                
Station ID: 8668482                                PUBLICATION DATE:  02/05/2004
Name:       BAILEYS LANDING, OKATEE RIVER                     
            SOUTH CAROLINA
NOAA Chart: 11513                                  Latitude:         32° 20.8' N
USGS Quad:  JASPER                                 Longitude:        80° 53.4' 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.