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

                                                                                
Station ID: 8720059                         PUBLICATION DATE:  08/19/2011
Name:       MELTON NELSON MEM PK, VAUGHNS LDG                 
            FL
NOAA Chart: 11488                           Latitude:   30° 37.8' N (  30.63000)
USGS Quad:  AMELIA ISLAND                   Longitude:  81° 34.6' W ( -81.57670)


To reach from the intersection of Interstate 95 and SR 200/A1A proceed east 7.9
km (4.9 mi) to Melton Nelson Park on the right just past the bridge crossing
Lofton Creek.  The bench marks are located in the vicinity.


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


                 PRIMARY BENCH MARK STAMPING:   0059 A 2008
                         DESIGNATION:          872 0059 A

MONUMENTATION:           Tidal Station disk                    VM#:        18641
AGENCY:                  National Ocean Survey/Service (NOS)   IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID#: BBFC47
LATITUDE:   30° 37.7' N (  30.62908)          LONGITUDE:  81° 34.2' W ( -81.57075)


The primary bench mark is a disk located on the Melton Nelson Park
property,13.10 m (42.98 ft) NW of a 0.5 m diameter palm tree, 8.92 m (29.27 ft)
south of the centerline of the ramp, 8.72m (28.61 ft) ESE of the creek bulkhead
on south side of the ramp, 3 m (9.8 ft) east of bench mark 872 0059 E, 2.74 m
(8.99 ft) NNW of a carsonite witness post.  The bench mark is recessed below
ground, crimped to a stainless steel rod driven 14.1 m (46.2 ft) to refusal.  

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

                                                                                
Station ID: 8720059                         PUBLICATION DATE:  08/19/2011
Name:       MELTON NELSON MEM PK, VAUGHNS LDG                 
            FL
NOAA Chart: 11488                           Latitude:   30° 37.8' N (  30.63000)
USGS Quad:  AMELIA ISLAND                   Longitude:  81° 34.6' W ( -81.57670)


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


                         BENCH MARK STAMPING:   0059 B 2008
                         DESIGNATION:          872 0059 B

MONUMENTATION:           Tidal Station disk                    VM#:        18642
AGENCY:                  National Ocean Survey/Service (NOS)   IDB PID#:        
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID#: BBFC44
LATITUDE:   30° 37.8' N (  30.62919)          LONGITUDE:  81° 34.2' W ( -81.57075)


The bench mark is a disk set flush with the concrete, 26.10 m (85.63 ft) SSW of
a 1.2 m (3.94 ft) tall concrete Southern Bell telephone monument, 15.15 m (49.70
ft) SW of a power pole, 6.92 m (22.70 ft) SSE of 0.5 m (1.6 ft) diameter palm
tree, 1.86 m (6.10 ft) NNE of a light post, 1.92 m (6.30 ft) NE of a carsonite
witness post.



                         BENCH MARK STAMPING:  0059 C 2008
                         DESIGNATION:          872 0059 C

MONUMENTATION:           Tidal Station disk                    VM#:        18643
AGENCY:                  National Ocean Survey/Service (NOS)   IDB PID#:        
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID#: BBFC43
LATITUDE:   30° 37.8' N (  30.62925)          LONGITUDE:  81° 34.2' W ( -81.57078)


The bench mark is a disk set flush with the concrete, 12.8m (41.98 ft) ESE of
Lofton creek bulkhead on the north side of the ramp, 8.76 m (28.74 ft) NW of a
light pole, 3.37 m (11.06 ft) west of a 0.5 m diameter palm tree.

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

                                                                                
Station ID: 8720059                         PUBLICATION DATE:  08/19/2011
Name:       MELTON NELSON MEM PK, VAUGHNS LDG                 
            FL
NOAA Chart: 11488                           Latitude:   30° 37.8' N (  30.63000)
USGS Quad:  AMELIA ISLAND                   Longitude:  81° 34.6' W ( -81.57670)


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


                         BENCH MARK STAMPING:  0059 D 2008
                         DESIGNATION:          872 0059 D

MONUMENTATION:           Tidal Station disk                    VM#:        18644
AGENCY:                  National Ocean Survey/Service (NOS)   IDB PID#:        
SETTING CLASSIFICATION:  Bridge support                        OPUS PID:        
LATITUDE:   30° 37.8' N (  30.62931)          LONGITUDE:  81° 34.2' W ( -81.57081)


The bench mark is a disc set flush in the concrete support of the bridge
crossing Lofton Creek, 19.95 m (65.45 ft) NE of 0.5 m (1.6 ft) diameter palm
tree on the north side of the ramp, 10.04 m (32.94 ft) ESE of the Lofton Creek
bulkhead on the north side of the ramp, 1.44 m (4.72 ft) down from the top
surface of the bridge railing on the southern side of the east bound traffic
lane.  



                         BENCH MARK STAMPING:  872 0059 E 2008
                         DESIGNATION:          872 0059 E

MONUMENTATION:           Tidal Station disk                    VM#:        18645
AGENCY:                  NOS                                   IDB PID#:        
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID#: BBFC42
LATITUDE:   30° 37.7' N (  30.62908)          LONGITUDE:  81° 34.2' W ( -81.57078)


The bench mark is a disk set flush with the concrete, 14.31 m (46.95 ft) south
of a light post number 1440707842, 11.81 m (38.75 ft) ESE of the Lofton Creek
bulkhead on the south side of the ramp, 11.22 m (36.81 ft) NNW of a 0.5 diameter
palm tree on the south side of the ramp, 3 m (9.8 ft) west of bench mark 872
0059 A, 2.31 m (7.58 ft) NE of a carsonite witness post.

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

                                                                                
Station ID: 8720059                         PUBLICATION DATE:  08/19/2011
Name:       MELTON NELSON MEM PK, VAUGHNS LDG                 
            FL
NOAA Chart: 11488                           Latitude:   30° 37.8' N (  30.63000)
USGS Quad:  AMELIA ISLAND                   Longitude:  81° 34.6' W ( -81.57670)


                            T I D A L   D A T U M S 


Tidal datums at MELTON NELSON MEM PK, VAUGHNS LDG based on:

     LENGTH OF SERIES:      2 YEARS
     TIME PERIOD:           Sept. 2008 - Aug. 2009 and Feb. 2010 - Jan. 2011
     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:

     HIGHEST OBSERVED WATER LEVEL (05/21/2009)         =  1.397
     MEAN HIGHER HIGH WATER                     MHHW   =  0.915
     MEAN HIGH WATER                            MHW    =  0.884
     MEAN SEA LEVEL                             MSL    =  0.558
     MEAN TIDE LEVEL                            MTL    =  0.484
     MEAN LOW WATER                             MLW    =  0.084
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (02/14/2011)         = -0.731

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

      0059 A 2008                                1.388    0.504
      0059 B 2008                                1.517    0.633
     0059 C 2008                                 1.478    0.594
     0059 D 2008                                 3.568    2.684
     872 0059 E 2008                             1.437    0.553


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

                                                                                
Station ID: 8720059                         PUBLICATION DATE:  08/19/2011
Name:       MELTON NELSON MEM PK, VAUGHNS LDG                 
            FL
NOAA Chart: 11488                           Latitude:   30° 37.8' N (  30.63000)
USGS Quad:  AMELIA ISLAND                   Longitude:  81° 34.6' W ( -81.57670)


                             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.