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KEI-P89-1104 .R1 January 8 , 1990 Page 4 SUBSURFACE CONDITIONS The subsurface soils exposed in the excavations consisted primarily of silty sand. The pit was dry and there was no visible evidence of past high water in the pit. ANALYTICAL RESULTS All samples were analyzed by Sequoia Analytical Laboratory in Redwood City, California and were accompanied by properly executed Chain of Custody documentation. All soil samples were analyzed for total petroleum hydrocarbons (TPH) as gasoline using EPA method 5030 in conjunction with modified 8015, benzene, toluene, xylenes and ethylbenzene (BTX&E) using EPA method 8020, tetraethyl lead using the DHS-LUFT method, and ethylene dibromide using modified DHS-AB1803 . The waste oil tank bottom and waste oil remote fill piping samples were analyzed for total extract- able petroleum hydrocarbons (TEPH) using EPA methods 3550 in conjunction with modified 8015, BTX&E using EPA 5030 in conlunc-- tion with 8020 , halogenated volatile organics using EPA method 8010, PCB ' s using EPA 8080, and metals - cadmium, chromium, lead and zinc. The water sample was analyzed for TPH as gasoline using EPA methods 5030 and 8015, BTX&E using EPA 503 . 1, halogena- ted volatile organics using EPA 502 . 1, tetraethyl lead using DHS- LUFT and ethylene dibromide using EPA 504 . Analytical results of the final soil samples collected from beneath the fuel storage tanks, (samples Al, A2 (25. 5) , B1 and B2 (26. 5) ) , indicate levels of TPH as gasoline ranging from non- detectable to 1.7 ppm, with non-detectable levels of ethylene dibromide. Analytical results of the soil samples, collected from sidewalls of the fuel storage tank pit, indicate levels of TPH as gasoline ranging from non-detectable to 16 ppm, levels of ethylene dibromide ranging from non-detectable to 0. 014 ppm, and levels of benzene ranging from non-detectable to 0. 58 ppm. Analyses of the soil sample collected from the new tank pit indicate non-detectable levels of all constituents analyzed. Analytical results of the final soil samples collected from product pipe trenches, (samples P1 (6) , P2 (17) , P3 (5) and P4 (8) ) , indicate levels of TPH as gasoline ranging from non-detectable to 1. 7 ppm, with non-detectable levels of benzene, except sample P2 (17) , which showed 7 , 200 ppm of TPH as gasoline and 1.70 ppm of ' benzene. Analyses of vapor piping trench samples indicate non- detectable levels of TPH as gasoline for sample V1, and 4 . 2 ppm TPH as gasoline for sample V2 , with non-detectable levels of EDB in each case.