400644 FCRE MAJ Colio 28 Nov 78 - FACT SUEET SUBJECT: token (Llrene) Subsurface Contamination PURPOSE: To provide current status of Boken tamination. (Irene) subsurface TRU soil con- BACKGROUND: a. Boken surface contamination meets Condition B (80 pCi/gm). b. There are three areas of subsurface soil TRU contamination that ex- c. The original excision plan was to begin in Sep 78; ceed Condition D (160 pCi/gm) for a total estimate volume of 1406 cy (See Encl 1). ° however, birds (Sooty terns) moved onto the island in late Aug 78 fer annual nesting. Eggs were layed at a minimum density of one per square meter. Nests, eggs and chicks have covered the excision area and haul road since Sep 78 thus delaying soil removal efforts.. r DISCUSSION: a. The soil excisian operation will involve one front loader, two five ton dumptrucks and one bulldozer, b. Each of the three areas to be excised is less than 2230 et? and the maximum depth of cut is 80 - 120 cm (2.6 - 4.0 feec). ce. The work force will be drawn from USAE clements presently on Enjebi as Enjebi soil excision is 98% complete. d. The haul road from the excision site to the beach stockpile area will be levelled by bulldozer. The beach area will require minor bulldoze. preparation for vehicular traffic. Experience indicates the tactical four wheel drive five ton dumptruck will encounter no trafficability problems on the beach. . e. Although the Boken shallcw water approaches constrain LCU and LCM 8 movement as severely as Aomon (Sally), the small amount of soil to be excised will be stockpiled rapidly and total transport time for all the soil will not exeeed sixty days. In any fourtecn day period, at least four days will not have a daylight high tide window adequate to allow access, loading and egress of soil haul craft. STATUS ; a. As of 25 Nov 78 few eggs are evident in the excavation area and the the chicks are mobile enough to move out of the way of heavy equipment. — TAG L 5ac5iZ3 oe (cet (