JOHNSTON
F &S NO.
01098
USER
ATOLL
AMICOM
RDT&E
MIPR
00005
SCIENTIFIC
TITLE
Radar Screen
-
Subtask A942
STRUCTURE /FACILITY NO.
JTF-8
FUNDING
AGENCY
(nw
SCIENTIFIC STATION NO.
None
($000)
BoD
None
ENGR
PROC
CONST
FoDGO+90
TOTAL
FURN
PRE-GO
Prior Cost
14.6
POST-GO
Estimate 8/67
TOTAL
14.6
22.0
80.0
116.6
4.6
83.4
88.0
26.6
163.4
204.6
PRIOR YEARS
ENGINEERING
Completed.
Drawings:
91-7-17-S1 thru $4
PROCUREMENT
Completed including most Post-GO construction material.
CONSTRUCTION Two rows of 10 BP 42 piling have been installed perpendicular to the south shoreline and approximately midway between the east and
west peninsulas. The two rows are parallel and 21-ft. apart with the piles
in each row driven vertically and spaced 45-ft. apart, forming 21-ft. wide
bents and twenty (20) 45-ft. long bays. Each row is 900-ft. long and extends
out into the ocean approximately 800-ft. Each pile has been embedded a
minimum of 10-ft. below an "assumed firm material’’ horizon which varies
in depth from 5 to 8-ft. below mean lower low water (MLLW) and each pile
rises to a height of approximately 23 1/4-ft. above MLLW. One anchor
block with a short pile has been installed at each end of the two rows. The
Post-GO longitudinal supports for each row of piles will be tied off to these
anchors.
Before erection,
each pile was sandblasted, painted with metal
primer, and then two coats of coal tar epoxy were applied.
POST-GO
PROCUREMENT All material for the main screen assembly has been procured Pre-GO. Material to be procured Post-GO is that required for construction of the "baffle" screen.
CONSTRUCTION steel Pratt type truss 12 1/2-ft. deep will be erected
between the piles at each 21]-ft. wide bent for supporting the screen supports.
The piles in each row will be longitudinally braced using l-in. diameter
VOLI
April 1989
1-80
see