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«' I; s•rG1 (tl: s0L' Itc1",s , l � t <br /> �a <br /> 2BACKGROUND R <br /> r <br /> The results of past subsurface investigations conducted by Weiss Associates(WA)of Oakland, s <br /> truer dated 3 <br /> California are summarized in a and April it <br /> submitted to he Ssenior Kathleen <br /> anJoaquin 1xicalHealthl District <br /> ` <br /> to lan Munoz of Safeway Stores, Inc., <br /> (SJLHD). The following is a very brief in that teller. <br /> outline of the information <br /> "6 • ;�,� On 7 and 8 April 1987,Weiss Ac,wciatcs(WA)supervised the drilling of nine sail borings and <br /> collected soil samples around the underground storage tanks. One sample each from eight of the <br /> rin s was analyied for total feel hydrocarbons(TFiI)and benzene,toluene and fatal xylenes(BT <br /> i <br /> bo & <br /> A sail sample collected from 20.7 ft below grade was he only one in which TFH were detected,at .., <br /> IRY. m BTX were not detected in any sam . <br /> parts-per-million (ppm). ples <br /> Between G and 10 June 1987,he four underground furl storage tanks were removed. Water <br /> encountered in the excavation at about 9.25 ft below gr,;-.df:. Strong hydrocarbon odors and sheen <br /> was <br /> were noted in the open excavation. Gravel fill rcrtoved from the pit was slightly stained, but p <br /> hydrocarbon staining was not observed on the excavation walls. The water sample collected from the <br /> pit contained 1.1 parts-per-billion(ppb)total xylenes. The pea gravel containing fuel hydrocarbons was <br /> returned to the excavation. <br /> 1 , Monitor wells MW-1 through MW-3 were installed on 12 to 14 August 19877(Figure 3). TF14 <br /> and BTX were not detected in soil samples collected during borehole drilling or in the groundwater <br /> samples collected after well completion. <br /> Approximately 750 cubic yards of pea gravel containing fuel hydrocarbons stored in the <br /> 24 January 19:8. In a letter dated 19 I4iay 1988 to the <br /> excavation was removed for aeration on 23 and <br /> 000 cubic yards of pea gravel and soil removed from the <br /> SJLHiD,WA requested permission to aerate 1, <br /> tank excavation Gn-site. <br /> On 12 and 15 March 1988, eleven soil samples were collected from 0.5 ft to 1 ft below the <br /> 13-inch thick concrete slab encountered at 13.5 ft below grade and analyzed for total petroleum <br /> be left in Vb e. In a letter dated 10 June 1988 to Gordon <br /> hydrocarbons(T1H) to determine if it could <br /> "- Boggs,California Regional Water Quality Control Board-Ccalral Valley Regina(RWQCB CVit),WA <br /> 2 <br /> 4•+ <br /> r w, 0761ZIDI: <br />