Bench Mark Sheet for 8517756, Kingsborough CC

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  6

                                                                                
Station ID: 8517756                         PUBLICATION DATE:  01/13/2016
Name:       KINGSBOROUGH CC, SHEEPSHEAD BAY                   
            NY
NOAA Chart: 12350                           Latitude:   40° 34.9' N (  40.58125)
USGS Quad:  Coney Island                    Longitude:  73° 56.0' W ( -73.93383)


To reach the station from the northern security checkpoint at the entrance to
Kingsborough Community College campus on Shore Boulevard in Brooklyn,  proceed
0.24 km (0.15 mi) east on Shore Boulevard past the checkpoint to the Maritime
Technology Program building T-3 on the right and the tide station on the
concrete dock directly north across the street.  The bench marks are in the
seawall and buildings around the perimeter of the campus.


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


                 PRIMARY BENCH MARK STAMPING:  7756 A 2015
                         DESIGNATION:          851 7756 A

MONUMENTATION:           DB                                    VM#:        21358
AGENCY:                  National Ocean Service                IDB PID#:        
SETTING CLASSIFICATION:  Massive retaining walls               OPUS PID:        
LATITUDE:   40° 34.9' N (  40.58114)          LONGITUDE:  73° 56.0' W ( -73.93400)


The primary bench mark is a disk set in the top of a concrete seawall, 32.75 m
(107.4 ft) NNE of a light pole on the N side of tennis courts, 27.26 m (89.4 ft)
WNW of flag pole E of sidewalk leading to concrete pier, 24.34 m (79.9 ft) ENE
of light pole in grass S of seawall, 13.73 m (45.0 ft) NNW of fire hydrant in
grass S of seawall and 7.73 m (25.4 ft) NE of the NE corner of chain link fence
around electrical transformer.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  6

                                                                                
Station ID: 8517756                         PUBLICATION DATE:  01/13/2016
Name:       KINGSBOROUGH CC, SHEEPSHEAD BAY                   
            NY
NOAA Chart: 12350                           Latitude:   40° 34.9' N (  40.58125)
USGS Quad:  Coney Island                    Longitude:  73° 56.0' W ( -73.93383)


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


                         BENCH MARK STAMPING:  7756 B 2015
                         DESIGNATION:          851 7756 B

MONUMENTATION:           DB                                    VM#:        21359
AGENCY:                  National Ocean Service                IDB PID#:        
SETTING CLASSIFICATION:  Massive retaining walls               OPUS PID#: BBDV04
LATITUDE:   40° 34.7' N (  40.57856)          LONGITUDE:  73° 55.9' W ( -73.93200)


The bench mark is a disk set in the top of a concrete seawall that is now inland
of a parking area and the new seawall on the E side of campus, 21.41 m (70.2 ft)
WNW of second light pole from S along newer section of seawall E of parking
area, 19.26 m (63.2 ft) SSW of third light pole from S along newer section of
seawall E of parking area, 19.09 m (62.6 ft) SE of light pole E of building t7,
18.01 m (59.1 ft) ENE of fire hydrant that is W of seawall avenue and S of
building t7 and 12.73 m (41.8 ft) ESE of do not enter sign W of seawall avenue
and N of concrete driveway.



                         BENCH MARK STAMPING:  7756 C 2015
                         DESIGNATION:          851 7756 C

MONUMENTATION:           DB                                    VM#:        21360
AGENCY:                  National Ocean Service                IDB PID#:        
SETTING CLASSIFICATION:  Mat foundations                       OPUS PID:        
LATITUDE:   40° 34.6' N (  40.57642)          LONGITUDE:  73° 55.9' W ( -73.93181)


The bench mark is a disk set in N end of the concrete sill of the S of two
garage doors, 23.25 m (76.3 ft) W of light pole on N side of concrete access
driveway and S of brick wall, 19.79 m (64.9 ft) WNW of light pole near angle
point on S side of concrete access driveway, 10.59 m (34.7 ft) NW of first light
pole E of marine academic center building and S of concrete access driveway,
7.64 m (25.1 ft) N of marine academic center building corner on east side of a
doorway and 5.50 m (18.0 ft) SW of N most bollard protecting the N garage door.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  6

                                                                                
Station ID: 8517756                         PUBLICATION DATE:  01/13/2016
Name:       KINGSBOROUGH CC, SHEEPSHEAD BAY                   
            NY
NOAA Chart: 12350                           Latitude:   40° 34.9' N (  40.58125)
USGS Quad:  Coney Island                    Longitude:  73° 56.0' W ( -73.93383)


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


                         BENCH MARK STAMPING:  N.E. KING 1989
                         DESIGNATION:          851 7756 NE KING

MONUMENTATION:           DB                                    VM#:        21361
AGENCY:                  US Army Corps of Engineers            IDB PID#:        
SETTING CLASSIFICATION:  Massive retaining walls               OPUS PID:        
LATITUDE:   40° 34.9' N (  40.58114)          LONGITUDE:  73° 56.0' W ( -73.93256)


The bench mark is a disk set just S of the NE corner of the seawall, 32.14 m
(105.4 ft) NE of a light pole on the W side of seawall avenue at the N end,
23.54 m (77.2 ft) ESE of W most post for railing on E side of the dry dock pier,
17.64 m (57.9 ft) S of metal pole with square concrete base N of seawall in rock
riprap, 4.49 m (14.7 ft) E of metal pole for camera mount SW of the seawall
corner and 4.17 m (13.7 ft) N of N most bollard on sea wall before wall steps
down 0.6 m (2.0 ft) to lower seawall.  The disk is recessed 1 cm (0 inch) in the
concrete.



                         BENCH MARK STAMPING:  P. T. E. 1989
                         DESIGNATION:          851 7756 PT E

MONUMENTATION:           DB                                    VM#:        21362
AGENCY:                  US Army Corps of Engineers            IDB PID#:        
SETTING CLASSIFICATION:  Massive retaining walls               OPUS PID:        
LATITUDE:   40° 34.6' N (  40.57625)          LONGITUDE:  73° 55.9' W ( -73.93125)


The bench mark is a disk set in the top of the seawall, 28.11 m (92.2 ft) SE of
E most light pole on W side of seawall avenue and S of concrete driveway to
marine academic center building, 26.28 m (86.2 ft) NE of emergency call box on
post in grass NW of seawall avenue and 23.31 m (76.5 ft) SE of fire hydrant on W
side of seawall avenue.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  6

                                                                                
Station ID: 8517756                         PUBLICATION DATE:  01/13/2016
Name:       KINGSBOROUGH CC, SHEEPSHEAD BAY                   
            NY
NOAA Chart: 12350                           Latitude:   40° 34.9' N (  40.58125)
USGS Quad:  Coney Island                    Longitude:  73° 56.0' W ( -73.93383)


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


                         BENCH MARK STAMPING:  P.T. F. 1989
                         DESIGNATION:          851 7756 PT F

MONUMENTATION:           DB                                    VM#:        21363
AGENCY:                  US Army Corps of Engineers            IDB PID#:        
SETTING CLASSIFICATION:  Massive retaining walls               OPUS PID:        
LATITUDE:   40° 34.5' N (  40.57581)          LONGITUDE:  73° 55.9' W ( -73.93161)


The bench mark is a disk set in the top of the concrete seawall, 10.32 m (33.9
ft) SSE of fire hydrant on N side Seawall Avenue, 9.16 m (30.1 ft) SE of utility
manhole on N side of Seawall Avenue and 9.05 m (29.7 ft) NNE of the SE corner of
concrete wing wall on S side of seawall.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  6

                                                                                
Station ID: 8517756                         PUBLICATION DATE:  01/13/2016
Name:       KINGSBOROUGH CC, SHEEPSHEAD BAY                   
            NY
NOAA Chart: 12350                           Latitude:   40° 34.9' N (  40.58125)
USGS Quad:  Coney Island                    Longitude:  73° 56.0' W ( -73.93383)


                            T I D A L   D A T U M S 


Tidal datums at KINGSBOROUGH CC, SHEEPSHEAD BAY based on:

     LENGTH OF SERIES:      5 MONTHS
     TIME PERIOD:           April 2015 - August 2015
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8531680 SANDY HOOK


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

     MEAN HIGHER HIGH WATER                     MHHW   =  1.674
     MEAN HIGH WATER                            MHW    =  1.566
     MEAN TIDE LEVEL                            MTL    =  0.815
     MEAN SEA LEVEL                             MSL    =  0.810
     MEAN LOW WATER                             MLW    =  0.065
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     7756 A 2015                                 3.759    2.193
     7756 B 2015                                 4.428    2.862
     7756 C 2015                                 4.474    2.908
     N.E. KING 1989                              3.794    2.228
     P. T. E. 1989                               4.438    2.872
     P.T. F. 1989                                4.445    2.879


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

                                                                                
Station ID: 8517756                         PUBLICATION DATE:  01/13/2016
Name:       KINGSBOROUGH CC, SHEEPSHEAD BAY                   
            NY
NOAA Chart: 12350                           Latitude:   40° 34.9' N (  40.58125)
USGS Quad:  Coney Island                    Longitude:  73° 56.0' W ( -73.93383)


                             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.

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