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

                                                                                
Station ID: 8661593                         PUBLICATION DATE:  08/03/2004
Name:       WINEA PLANTATION, BLACK RIVER                     
            SC
NOAA Chart: 11532                           Latitude:   33° 32.1' N (  33.53500)
USGS Quad:  RHEMS                           Longitude:  79° 23.3' W ( -79.38830)


To reach the tidal bench marks from the intersection of U.S. Highway 521 and
State Highway 41 in Andrews, proceed north on State Highway 41 for 18.5 km (11.5
mi), then turn right on State Highway 51and proceed south for 8.2 km (5.1 mi) to
a dirt road entrance at Winea Plantation, then turn left onto the dirt road and
proceed through the wooden gates for 0.3 km (0.2 mi) to the parking area on the
rise overlooking the wooden boat house.  Caution should be exercised while
parking, as the ground can become very soft. The bench marks are located in the
vicinity of the parking area and the nearby woods.  The tide gage and staff were
located in the boat house.


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


                 PRIMARY BENCH MARK STAMPING:  1593 C 1982
                         DESIGNATION:          866 1593 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         3831
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  DD2212
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   33° 32.1' N (  33.53500)          LONGITUDE:  79° 23.4' W ( -79.39000)


The primary bench mark is a disk located near the boat house along a barbed wire
fence and a 0.97 m (3.2 ft) cypress tree, 21.03 m (69.0 ft) WNW of the wooden
boat house, 14.84 m (48.7 ft) NNW of the northwestern corner of a concrete block
pumphouse, 1.71 m (5.6 ft) SSW of the fence, and 0.55 m (1.8 ft) SSW of a
witness post and sign.  The bench mark is set 0.03 m (0.1 ft)  below ground
level, crimped to the top of a stainless steel rod driven 4.9 m (16 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  2 of  5

                                                                                
Station ID: 8661593                         PUBLICATION DATE:  08/03/2004
Name:       WINEA PLANTATION, BLACK RIVER                     
            SC
NOAA Chart: 11532                           Latitude:   33° 32.1' N (  33.53500)
USGS Quad:  RHEMS                           Longitude:  79° 23.3' W ( -79.38830)


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


                         BENCH MARK STAMPING:  35 SY 48 1934
                         DESIGNATION:          35 SY 48

MONUMENTATION:           Bench Mark disk                       VM#:         3829
AGENCY:                  US Geological Survey (USGS)           IDB PID#:  DD2210
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   33° 32.1' N (  33.53500)          LONGITUDE:  79° 23.4' W ( -79.39000)


The bench mark is a disk set in a concrete monument located near a wire fence NW
of the Winea plantation entrance, 52.97 m (173.8 ft) west of bench mark 1593 E
1982, 33.56 m (110.1 ft) NNW of the northern most pillar to the entrance of the
property, 19.90 m (65.3 ft) WNW of a 1 m (3 ft) diameter tree (measured at the
west face), 2.71 m (8.9 ft) NE of the wooden fence line, 0.49 m (1.6 ft) NE of a
metal witness post and sign, and 0.06 m (0.2 ft) above the ground.



                         BENCH MARK STAMPING:  1593 B 1982
                         DESIGNATION:          866 1593 B TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         3830
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  DD2213
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   33° 32.1' N (  33.53500)          LONGITUDE:  79° 23.4' W ( -79.39000)


The bench mark is a disk set in a concrete monument located in a partially
cleared wooded area,  66.11 m (216.9 ft) NE of bench mark 1593 E 1982, 41.00 m
(134.5 ft)  NW of bench mark 1593 C 1982, 11.06 m (36.3 ft) west of a barbed
wire fence, 7.38 m (24.2 ft) south of a woven wire fence, and 0.06 m (0.2 ft)
above ground level.

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

                                                                                
Station ID: 8661593                         PUBLICATION DATE:  08/03/2004
Name:       WINEA PLANTATION, BLACK RIVER                     
            SC
NOAA Chart: 11532                           Latitude:   33° 32.1' N (  33.53500)
USGS Quad:  RHEMS                           Longitude:  79° 23.3' W ( -79.38830)


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


                         BENCH MARK STAMPING:  1593 D 1982
                         DESIGNATION:          866 1593 D TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         3832
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  DD2209
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   33° 32.1' N (  33.53500)          LONGITUDE:  79° 23.4' W ( -79.39000)


The bench mark is a disk set in a concrete monument located near the SW entrance
of the Winea plantation, 43.77 m (143.6 ft) SW of bench mark 1593 E 1982, 33.56
m (110.1 ft) SSE of bench mark ELEV 35 FT SY 48 1934, 14.72 m (48.3 ft) SE of
the north wooden pillar at the entrance to the property, 5.94 m (19.5 ft) south
of the centerline of the dirt road, 5.82 m  (19.1 ft) NE of a fence post.



                         BENCH MARK STAMPING:  1593 E 1982
                         DESIGNATION:          866 1593 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         3833
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  DD2211
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   33° 32.1' N (  33.53500)          LONGITUDE:  79° 23.4' W ( -79.39000)


The bench mark is a disk located in an open area near a group of pine trees,
52.97 m (173.8 ft) east of bench mark 35 SY 48 1934, 17.37 m (57.0 ft) NNW of
the centerline of the dirt road, 5.52 m (18.1 ft) south of an irrigation pipe
head extending 1 m (3 ft) above the ground, and  0.40 m (1.3 ft) SSE of a metal
witness post and sign.  The bench mark is set at ground level, crimped to the
top of a stainless steel rod driven 6.1 m (20 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  4 of  5

                                                                                
Station ID: 8661593                         PUBLICATION DATE:  08/03/2004
Name:       WINEA PLANTATION, BLACK RIVER                     
            SC
NOAA Chart: 11532                           Latitude:   33° 32.1' N (  33.53500)
USGS Quad:  RHEMS                           Longitude:  79° 23.3' W ( -79.38830)


                            T I D A L   D A T U M S 


Tidal datums at WINEA PLANTATION, BLACK RIVER based on:

     LENGTH OF SERIES:      3 MONTHS
     TIME PERIOD:           April 1982 - June 1982
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8661139 BUCKSPORT, WACCAMAW RIVER


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.803
     MEAN HIGH WATER                            MHW    =  0.769
     MEAN SEA LEVEL                             MSL    =  0.458
     MEAN TIDE LEVEL                            MTL    =  0.408
     North American Vertical Datum              NAVD88 =  0.326
     MEAN LOW WATER                             MLW    =  0.048
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     1593 C 1982                                 3.576    2.807
     35 SY 48 1934                              10.816   10.047
     1593 B 1982                                 5.847    5.078
     1593 D 1982                                10.656    9.887
     1593 E 1982                                 9.206    8.437


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

                                                                                
Station ID: 8661593                         PUBLICATION DATE:  08/03/2004
Name:       WINEA PLANTATION, BLACK RIVER                     
            SC
NOAA Chart: 11532                           Latitude:   33° 32.1' N (  33.53500)
USGS Quad:  RHEMS                           Longitude:  79° 23.3' W ( -79.38830)


                             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.