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i <br /> ' niSalvo Trucking - OES <br /> October 14, 1993 <br /> Page -a- <br /> Upon removal and inspection of the tanks, no holes or stress <br /> fractures were noted. Grey petroleum staining was noted on the <br /> ' east sidewall of the excavation , a jacent .to the fill ends of <br /> z <br /> tanks TK3, TK4, and TK5, to a depth of approximately 8 feet below <br /> the ground surface. Groundwater was not encountered during the <br /> tank removal. <br /> Based upon the field observations and laboratory results, <br /> Condor recommends that the petroleum stained soil at the east <br /> ends of TK3, TK4, and TK5 be excavated. Visual inspection for <br /> evidence of soil staining and field screening using an organic <br /> , <br /> vapor analyzer (OVA) should be conducted during the over- <br /> excavation to assist in evaluating the extent of the contaminated <br /> soil. Following the over-excavation, verification samples should <br /> be collected from each sidewall and the floor of the excavation. <br /> The samples should be analyzed for B EX and TEPH quantified as <br /> diesel and motor oil. Disposal options for the excavated and <br /> stockpiled soil (e.g. , air stripping, bioremediation, land <br /> disposal, etc . ) should be investigat d. If you have any <br /> questions, please call James Wack, T rlock office, (209 ) 668- <br /> 9234. <br /> Re ct, u 1 submitted, <br /> James F lWac s' � D G, Robert Hoagland <br /> Staff Geologist �� �`` -` Registered Re Geologist <br /> ROBE�if Q.WOAGIANQ g� g <br /> State of California <br /> JW3; isalvo.X)T HQ.4851 #4851 <br /> P <br /> (1F CAUF4�� <br /> CONDOR <br /> -i ' <br />