U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  8

                                                                                
Station ID: 8720333                         PUBLICATION DATE:  02/05/2004
Name:       PINEY POINT, ST. JOHNS RIVER                      
            FL
NOAA Chart: 11488                           Latitude:   30° 13.7' N (  30.22830)
USGS Quad:  ORANGE PARK                     Longitude:  81° 39.8' W ( -81.66330)


To reach the bench marks from the intersection of Interstate 295 and US Highway
17 in Orange Park, proceed 3.7 km (2.3 mi) north along US Highway 17 to the
entrance of the Naval Air Station (Ortega Hills), turn right and proceed east on
Yorktown Avenue for 2.1 km (1.3 mi) to the intersection of Hoyt Street, then
turn left and proceed north along Hoyt Street for 0.24 m (0.15 mi) to the
intersection with Albermarle Avenue, then turn right and proceed east on
Albermarle Avenue for 1.3 km (0.8 mi) to the pier.  The bench marks are near the
railroad tracks and the buildings near the pier.  The tide gauge and staff were
located on the pier.


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


                 PRIMARY BENCH MARK STAMPING:  1 1958
                         DESIGNATION:          872 0333 TIDAL 1

MONUMENTATION:           Tidal Station disk                    VM#:        10713
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  DH9193
SETTING CLASSIFICATION:  Concrete retaining wall               OPUS PID:        
LATITUDE:   30° 13.7' N (  30.22761)          LONGITUDE:  81° 39.9' W ( -81.66478)


The primary bench mark is a disk set flush in the concrete retaining wall on the
southern edge of pier 139, 98 m (320 ft) west of the east end of the pier, and
0.24 m (0.8 ft) north of the south edge of the pier.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  8

                                                                                
Station ID: 8720333                         PUBLICATION DATE:  02/05/2004
Name:       PINEY POINT, ST. JOHNS RIVER                      
            FL
NOAA Chart: 11488                           Latitude:   30° 13.7' N (  30.22830)
USGS Quad:  ORANGE PARK                     Longitude:  81° 39.8' W ( -81.66330)


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


                         BENCH MARK STAMPING:  2 1958
                         DESIGNATION:          872 0333 TIDAL 2

MONUMENTATION:           Tidal Station disk                    VM#:        10714
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BC1548
SETTING CLASSIFICATION:  Concrete sidewalk                     OPUS PID:        
LATITUDE:   30° 13.7' N (  30.22830)          LONGITUDE:  81° 40.0' W ( -81.66670)


The bench mark is a disk set in the top of a concrete sidewalk near the
intersection of Albermarle Avenue and Catapult Road, 152 m (500 ft) west of the
breakwater, 76 m (250 ft) north of the north side of Building 121 (the boat
house at the end of pier 139), and 5 m (15 ft) SW of the SW corner of Building
151 D.



                         BENCH MARK STAMPING:  3 1958
                         DESIGNATION:          872 0333 TIDAL 3

MONUMENTATION:           Tidal Station disk                    VM#:        10715
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BC1547
SETTING CLASSIFICATION:  Concrete breakwater                   OPUS PID:        
LATITUDE:   30° 13.6' N (  30.22670)          LONGITUDE:  81° 40.0' W ( -81.66670)


The bench mark is a disk set flush in the top of the concrete breakwater near
pier 139, 41 m (135 ft) south of the south end of Building 121 and 0.15 m (0.5
ft) west of the east edge of the breakwater.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  8

                                                                                
Station ID: 8720333                         PUBLICATION DATE:  02/05/2004
Name:       PINEY POINT, ST. JOHNS RIVER                      
            FL
NOAA Chart: 11488                           Latitude:   30° 13.7' N (  30.22830)
USGS Quad:  ORANGE PARK                     Longitude:  81° 39.8' W ( -81.66330)


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


                         BENCH MARK STAMPING:  2 14 1977
                         DESIGNATION:          2 14

MONUMENTATION:           Bench Mark disk                       VM#:        10716
AGENCY:                  Florida Department of Natural Resources
                         (FLDNR)                               IDB PID#:  BC1546
SETTING CLASSIFICATION:  Concrete post                         OPUS PID:        
LATITUDE:   30° 13.7' N (  30.22753)          LONGITUDE:  81° 40.8' W ( -81.67936)


The bench mark is a disk set in the top of a concrete post near the railroad
tracks, 7.77 m (25.5 ft) NW of the intersection of Ajax Street and Albermarle
Avenue, 6.77 m (22.2 ft) south of the south rail of the railroad tracks, 0.55 m
(1.8 ft) NE of the corner of a metal fence, and 0.30 m (1.0 ft) east of a
witness post.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  8

                                                                                
Station ID: 8720333                         PUBLICATION DATE:  02/05/2004
Name:       PINEY POINT, ST. JOHNS RIVER                      
            FL
NOAA Chart: 11488                           Latitude:   30° 13.7' N (  30.22830)
USGS Quad:  ORANGE PARK                     Longitude:  81° 39.8' W ( -81.66330)


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


                         BENCH MARK STAMPING:  MULBERRY CAMERA 1381 GSS 1963
                         DESIGNATION:          MULBERRY CAMERA 1381

MONUMENTATION:           Survey disk                           VM#:        17036
AGENCY:                  Department of Defense (DOD)           IDB PID#:  BC0394
SETTING CLASSIFICATION:  Concrete pad                          OPUS PID:        
LATITUDE:   30° 13.1' N (  30.21833)          LONGITUDE:  81° 41.8' W ( -81.69667)


The bench mark is a disk set in the top of a 3.35 m x 5.49 m (11.0 ft x 18.0 ft)
concrete pad near the intersection of Wild Avenue and Allegheny Road, 19.35 m
(63.5 ft) north of the approximate centerline of Wild Avenue, 13.59 m (44.6 ft)
north of a power pole, 1.71 m (5.6 ft) north of a metal witness post, and 0.18 m
(0.6 ft) above ground level.



                         BENCH MARK STAMPING:  NO STAMPING
                         DESIGNATION:          207
                         ALIAS:                207

MONUMENTATION:           See descriptive text                  VM#:        17037
AGENCY:                  Department of Defense (DOD)           IDB PID#:  BC0390
SETTING CLASSIFICATION:  Tile pipe filled with concrete        OPUS PID:        
LATITUDE:   30° 13.5' N (  30.22500)          LONGITUDE:  81° 41.6' W ( -81.69330)


The bench mark is an iron pipe set in the center of a tile pipe filled with
concrete near the intersection of Yorktown Avenue and Childs Street, 0.5 km (0.3
mi) east of the main gate to the Naval Air Station on Yorktown Avenue, 17.22 m
(56.5 ft) north of the approximate centerline of Yorktown Avenue, 8.93 m (29.3
ft) east of the approximate centerline of Childs Street, and 0.24 m (0.8 ft)
below the ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  8

                                                                                
Station ID: 8720333                         PUBLICATION DATE:  02/05/2004
Name:       PINEY POINT, ST. JOHNS RIVER                      
            FL
NOAA Chart: 11488                           Latitude:   30° 13.7' N (  30.22830)
USGS Quad:  ORANGE PARK                     Longitude:  81° 39.8' W ( -81.66330)


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


                         BENCH MARK STAMPING:  YORK 1964
                         DESIGNATION:          YORK

MONUMENTATION:           Triangulation Station disk            VM#:        17038
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BC0392
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   30° 13.1' N (  30.21833)          LONGITUDE:  81° 41.8' W ( -81.69694)


The bench mark is a disk set in the top of a concrete monument near the
intersection of Wild Avenue and Allegheny Road, 37 m (121 ft) west of a power
pole, 23 m (75 ft) north of the centerline of Wild Avenue, 0.24 m (0.8 ft) south
of a metal witness post and 0.06 m (0.2 ft) below the ground. 

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  8

                                                                                
Station ID: 8720333                         PUBLICATION DATE:  02/05/2004
Name:       PINEY POINT, ST. JOHNS RIVER                      
            FL
NOAA Chart: 11488                           Latitude:   30° 13.7' N (  30.22830)
USGS Quad:  ORANGE PARK                     Longitude:  81° 39.8' W ( -81.66330)


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


                         BENCH MARK STAMPING:  YORK 1964 (AZ)
                         DESIGNATION:          YORK AZ MK

MONUMENTATION:           Azimuth Mark disk                     VM#:        17039
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BC0391
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   30° 13.1' N (  30.21889)          LONGITUDE:  81° 42.1' W ( -81.70222)


The bench mark is a disk set in the top of a concrete monument near the
intersection of Roosevelt Boulevard and Ortega Hills, 24.23 m (79.5 ft) east of
the east rail of a spur track to the Naval Air Station, 8.23 m (27.0 ft) south
of the centerline of Ortega Hills, 5.39 m (17.7 ft) north of the east post for
the gate, 0.46 m (1.5 ft) east of a railroad track post.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  8

                                                                                
Station ID: 8720333                         PUBLICATION DATE:  02/05/2004
Name:       PINEY POINT, ST. JOHNS RIVER                      
            FL
NOAA Chart: 11488                           Latitude:   30° 13.7' N (  30.22830)
USGS Quad:  ORANGE PARK                     Longitude:  81° 39.8' W ( -81.66330)


                            T I D A L   D A T U M S 


Tidal datums at PINEY POINT, ST. JOHNS RIVER based on:

     LENGTH OF SERIES:      2 MONTHS
     TIME PERIOD:           October 1978 - November 1978
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8720220 MAYPORT


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.303
     MEAN HIGH WATER                            MHW    =  0.282
     MEAN TIDE LEVEL                            MTL    =  0.150
     MEAN SEA LEVEL                             MSL    =  0.142
     MEAN LOW WATER                             MLW    =  0.017
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     1 1958                                      2.524    2.242
     2 1958                                      2.772    2.490
     3 1958                                      1.449    1.167
     2 14 1977                                   4.917    4.635
     MULBERRY CAMERA 1381 GSS 1963               7.034    6.752
     NO STAMPING                                 5.536    5.254
     YORK 1964                                   6.670    6.388
     YORK 1964 (AZ)                              4.723    4.441


Foot Notes:

Bench marks MULBERRY CAMERA 1381 GSS 1963, NO STAMPING, YORK 1964 and YORK 1964
(AZ) are based on one differential leveling connection and do not meet the
quality control standards of the NOS. Therefore, caution should be used when
deriving elevations for these marks. 

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  8 of  8

                                                                                
Station ID: 8720333                         PUBLICATION DATE:  02/05/2004
Name:       PINEY POINT, ST. JOHNS RIVER                      
            FL
NOAA Chart: 11488                           Latitude:   30° 13.7' N (  30.22830)
USGS Quad:  ORANGE PARK                     Longitude:  81° 39.8' W ( -81.66330)


                             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.