U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  4

                                                                                
Station ID: 8720011                         PUBLICATION DATE:  03/23/2009
Name:       CUT 1N FRONT RANGE, ST MARYS RIVER ENTR           
            FL
NOAA Chart: 11503                           Latitude:   30° 42.5' N (  30.70830)
USGS Quad:  FERNANDINA BEACH                Longitude:  81° 27.9' W ( -81.46500)


To reach the tidal bench marks from the Fernandina Beach Marina at the foot of
Atlantic Avenue in Fernandina Beach, proceed west by boat for 91 m (300 ft) to
Channel Marker 10, then north on the Intercoastal Waterway (Amelia River) for
3.7 km (2.3 mi) to the junction of the ICWW and St. Marys River, and the Coast
Guard Cut 1N front range light tower. The bench marks are located on the top
deck of the tower. The tide gage was located on the NW leg of the tower at the
lower deck.


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


                 PRIMARY BENCH MARK STAMPING:  FR CUT-1N NO. 1 1997 JAX DIST
                         DESIGNATION:          872 0011 TIDAL 1

MONUMENTATION:           Survey disk                           VM#:        13904
AGENCY:                  US Army Corps of Engineers (USE)      IDB PID#:        
SETTING CLASSIFICATION:  Steel deck                            OPUS PID:        
LATITUDE:   30° 42.5' N (  30.70830)          LONGITUDE:  81° 27.9' W ( -81.46500)


The bench mark is a disk epoxied into the steel deck on the top level of the
front range light tower at the junction of the Intercoastal Waterway (Amelia
River) and St. Marys River, 8.50 m (27.9 ft) south of the NW corner of the top
deck level, 7.86 m (25.8 ft) WNW of the SE corner, 7.71 m (25.3 ft) west of
bench mark FR CUT-1N NO. 2 1997 JAX DIST, and 0.85 m (2.8 ft) NE of the SW
corner.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  4

                                                                                
Station ID: 8720011                         PUBLICATION DATE:  03/23/2009
Name:       CUT 1N FRONT RANGE, ST MARYS RIVER ENTR           
            FL
NOAA Chart: 11503                           Latitude:   30° 42.5' N (  30.70830)
USGS Quad:  FERNANDINA BEACH                Longitude:  81° 27.9' W ( -81.46500)


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


                         BENCH MARK STAMPING:  FR CUT-1N NO. 2 1997 JAX DIST
                         DESIGNATION:          872 0011 TIDAL 2

MONUMENTATION:           Survey disk                           VM#:        13905
AGENCY:                  US Army Corps of Engineers (USE)      IDB PID#:        
SETTING CLASSIFICATION:  Steel deck                            OPUS PID:        
LATITUDE:   30° 42.5' N (  30.70830)          LONGITUDE:  81° 27.9' W ( -81.46500)


The bench mark is a disk epoxied into the steel deck at the top level of the
front range light tower at the junction of the Intercoastal Waterway (Amelia
River) and St. Marys River, 8.44 m (27.7 ft) south of the NE corner of the top
deck level, 7.74 m (25.4 ft) ENE of the SW corner, 7.71 m (25.3 ft) east of
bench mark FR CUT-1N NO. 1 1997 JAX DIST, and 0.82 m (2.7 ft) NW of the SE
corner.



                         BENCH MARK STAMPING:  FR CUT-1N NO. 3 1997 JAX DIST
                         DESIGNATION:          872 0011 TIDAL 3

MONUMENTATION:           Survey disk                           VM#:        13906
AGENCY:                  US Army Corps of Engineers (USE)      IDB PID#:        
SETTING CLASSIFICATION:  Steel deck                            OPUS PID:        
LATITUDE:   30° 42.5' N (  30.70830)          LONGITUDE:  81° 27.9' W ( -81.46500)


The bench mark is a disk epoxied into the steel deck at the top level of the
front range light tower at the junction of the Intercoastal Waterway (Amelia
River) and St. Marys River, 8.93 m (29.3 ft) NE of the SW corner of the top
level, 8.05 m (26.4 ft) NE of bench mark FR CUT-1N N0. 1 1997 JAX DIST, and 3.17
m (10.4 ft) east of the NW corner.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  4

                                                                                
Station ID: 8720011                         PUBLICATION DATE:  03/23/2009
Name:       CUT 1N FRONT RANGE, ST MARYS RIVER ENTR           
            FL
NOAA Chart: 11503                           Latitude:   30° 42.5' N (  30.70830)
USGS Quad:  FERNANDINA BEACH                Longitude:  81° 27.9' W ( -81.46500)


                            T I D A L   D A T U M S 


Tidal datums at CUT 1N FRONT RANGE, ST MARYS RIVER ENTR based on:

     LENGTH OF SERIES:      4 MONTHS
     TIME PERIOD:           January 1998 - April 1998
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8720030 FERNANDINA BEACH, AMELIA RIVER


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

     MEAN HIGHER HIGH WATER                     MHHW   =  1.981
     MEAN HIGH WATER                            MHW    =  1.876
     MEAN SEA LEVEL                             MSL    =  0.976
     MEAN TIDE LEVEL                            MTL    =  0.969
     MEAN LOW WATER                             MLW    =  0.060
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     FR CUT-1N NO. 1 1997 JAX DIST              12.871   10.995
     FR CUT-1N NO. 2 1997 JAX DIST              12.840   10.964
     FR CUT-1N NO. 3 1997 JAX DIST              12.855   10.979


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

                                                                                
Station ID: 8720011                         PUBLICATION DATE:  03/23/2009
Name:       CUT 1N FRONT RANGE, ST MARYS RIVER ENTR           
            FL
NOAA Chart: 11503                           Latitude:   30° 42.5' N (  30.70830)
USGS Quad:  FERNANDINA BEACH                Longitude:  81° 27.9' W ( -81.46500)


                             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.