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