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

                                                                                
Station ID: 8662245                                PUBLICATION DATE:  02/09/2017
Name:       OYSTER LANDING, CRAB HAUL CREEK                   
            SC
NOAA Chart: 11532                                  Latitude:         33° 21.1' N
USGS Quad:  PLANTERSVILLE                          Longitude:        79° 11.2' W


From the intersection of US Highways 17 and 701 in Georgetown, proceed east on
US Highway 17 for apporximately 7 km (4 mi) to the entrance to the Belle W.
Baruch Institute for Marine Biology and Coastal Research, then turn right onto
the entrance road and proceed for 0.08 km (0.05 mi) to an electric gate, then
proceed past the gate for 0.5 km (0.3 mi) to a sand road on the left and a
forked sand road up ahead, then turn left on the sand road and proceed for 3.62
km (2.25 mi) to a gravel parking lot for the lab on the left, then turn left
through the parking lot for 0.08 mi (0.05 mi) to a T-junction with a sand road,
then turn left onto the sand road and proceed for 0.2 km (0.1 mi) to the
maintenance shed, then continue on the causeway leading to the research pier. 
The bench marks are along the road leading from the maintenace shed to the pier.
 The tide station is 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:  2245 A 1982
                         DESIGNATION:          866 2245 A TIDAL

MONUMENTATION:           Tidal Station disk                        VM#:    16408
AGENCY:                  National Ocean Survey (NOS)               PID#:  DD1345
SETTING CLASSIFICATION:  Stainless steel rod


The primary bench mark is a disk set near the Belle Baruch Institute lab boat
landing on Crab Haul Creek, 8.11 m (26.6 ft) ENE of the north corner of a
concrete boat landing, 4.45 m (14.6 ft) north of power pole No. 70915 with a
security light, 0.52 m (1.7 ft) SSE of power pole No. 0656 with three
transformers, and 0.46 m (1.5 ft) ESE of a witness post.  The bench mark is set
10 cm (0.3 ft) below ground level, crimped to the top of a stainless steel rod
driven 11.3 m (37 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: 8662245                                PUBLICATION DATE:  02/09/2017
Name:       OYSTER LANDING, CRAB HAUL CREEK                   
            SC
NOAA Chart: 11532                                  Latitude:         33° 21.1' N
USGS Quad:  PLANTERSVILLE                          Longitude:        79° 11.2' W


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


                         BENCH MARK STAMPING:  2245 B 1982
                         DESIGNATION:          866 2245 B TIDAL

MONUMENTATION:           Tidal Station disk                        VM#:    16409
AGENCY:                  National Ocean Survey (NOS)               PID#:  DD1344
SETTING CLASSIFICATION:  Stainless steel rod


The bench mark is a disk set along the road leading to the lab boat ramp and
pier, 45.35 m (148.8 ft) west of power pole No. 50908, 29.29 m (96.1 ft) SE of
power pole No. 0657, 4.57 m (14.99 ft) SSW of the center of the road, 0.24 m
(0.8 ft) north of a metal witness post, and 0.76 m (2.5 ft) below the road.  The
bench mark is set 18 cm (0.6 ft) below ground level, crimped to the top of a
stainless steel rod driven 13.4 m (44 ft) to refusal, and encased in a PVC pipe
and concrete kickblock.



                         BENCH MARK STAMPING:  2245 C 1982
                         DESIGNATION:          866 2245 C TIDAL

MONUMENTATION:           Tidal Station disk                        VM#:    16410
AGENCY:                  National Ocean Survey (NOS)               PID#:  DD1343
SETTING CLASSIFICATION:  Stainless steel rod


The bench mark is a disk set along the dirt road leading to the lab boat ramp
and pier, 3.35 m (11.0 ft) NNE of the center of the road, 1.52 m (5.0 ft) east
of  a witness post, 0.94 m (3.1 ft) NW of a power pole with guy wire, and 0.15 m
(0.5 ft) below the road.  The bench mark is crimped to the top of a stainless
steel rod driven 11.0 m (36 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: 8662245                                PUBLICATION DATE:  02/09/2017
Name:       OYSTER LANDING, CRAB HAUL CREEK                   
            SC
NOAA Chart: 11532                                  Latitude:         33° 21.1' N
USGS Quad:  PLANTERSVILLE                          Longitude:        79° 11.2' W


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


                         BENCH MARK STAMPING:  2245 D 1982
                         DESIGNATION:          866 2245 D TIDAL

MONUMENTATION:           Tidal Station disk                        VM#:    16411
AGENCY:                  National Ocean Survey (NOS)               PID#:  DD4668
SETTING CLASSIFICATION:  Concrete monument


The bench mark is a disk set in top of a concrete monument near the boat sheds
along the road leading to the lab boat ramp and pier, 22.56 m (74.0 ft) north of
the center of the road, 7.13 m (23.4 ft) NE of the SW corner of the maintenance
shed, 0.58 m (1.9 ft) east of the east corner of the shed, 6 cm (0.2 ft) below
ground level, and about level with the road.



                         BENCH MARK STAMPING:  2245 E 1982
                         DESIGNATION:          866 2245 E TIDAL

MONUMENTATION:           Tidal Station disk                        VM#:    16412
AGENCY:                  National Ocean Survey (NOS)               PID#:  DD4667
SETTING CLASSIFICATION:  Concrete monument


The bench mark is a disk set in top of a concrete monument near the boat sheds
along the road leading to the lab boat ramp and pier, 49.38 m (162.0 ft) WNW of
the west corner of the maintenance shed, 0.82 m (2.7 ft) WNW of the southernmost
pole of the boat shed (Bay 1), 0.18 m (0.6 ft) SE of a witness post, and at
ground level.

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

                                                                                
Station ID: 8662245                                PUBLICATION DATE:  02/09/2017
Name:       OYSTER LANDING, CRAB HAUL CREEK                   
            SC
NOAA Chart: 11532                                  Latitude:         33° 21.1' N
USGS Quad:  PLANTERSVILLE                          Longitude:        79° 11.2' W


                            T I D A L   D A T U M S 


Tidal datums at OYSTER LANDING, CRAB HAUL CREEK based on:

     LENGTH OF SERIES:      9 Years
     TIME PERIOD:           9/04-8/10 & 1/12-12/13 & 1/15-12/15
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8661070 SPRINGMAID PIER, ATLANTIC OCEAN


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

     HIGHEST OBSERVED WATER LEVEL (10/08/2016)         =  2.971
     MEAN HIGHER HIGH WATER                     MHHW   =  1.557
     MEAN HIGH WATER                            MHW    =  1.450
     North American Vertical Datum              NAVD88 =  0.825
     MEAN SEA LEVEL                             MSL    =  0.817
     MEAN TIDE LEVEL                            MTL    =  0.754
     MEAN LOW WATER                             MLW    =  0.057
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (03/12/2005)         = -0.582

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     2245 A 1982                                 1.747    0.297
     2245 B 1982                                 2.327    0.877
     2245 C 1982                                 2.553    1.103
     2245 D 1982                                 1.907    0.457
     2245 E 1982                                 2.235    0.785


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

                                                                                
Station ID: 8662245                                PUBLICATION DATE:  02/09/2017
Name:       OYSTER LANDING, CRAB HAUL CREEK                   
            SC
NOAA Chart: 11532                                  Latitude:         33° 21.1' N
USGS Quad:  PLANTERSVILLE                          Longitude:        79° 11.2' 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.