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petroleum compounds The highest levels were found in samples from borings B-2, B-3 and B-5 with B-3 showing the highest levels These were all near the dispenser islands The sample from boring B-3 contained the 130,000 ppb (µg/L) TPH-g with 21,000 ppb MTBE, 3800 ppb benzene, 18,000 ppb toluene, 3,100 ppb ethylbenzene and 17,000 ppb xylenes The highest hydrocarbon levels reported in the GeoAudit investigation were from boring GB2, south of the UST location The groundwater sample was reported to contain 13,000 ppb TPH-g, ` 83 ppb benzene, 840 ppb toluene, 230 ppb ethylbenzene and 1900 ppb xylenes They also reported 3,400 ppb TPH-g, 35 ppb benzene, 48 ppb toluene, 16 ppb ethylbenzene and 96 ppb xylenes in boring G138 IAdditional Soil Borings On May 12'' , 1998 Westex began mud rotary drilling near the former waste oil tank location (13- 11) for collection of continuous core samples Because little soil was recovered, drilling was discontinued at a depth of approximately 35 feet Soil samples collected at depths of 14 feet and 33 feet below grade were submitted for chemical analysis Hydrocarbon contamination was reported for the sample at 33 feet below grade On May 27 and 28, 1998, Gregg Drilling completed Cone Penetrometry Borings CPT-1 I and CPT- 12 CPT-I I was located near B-11 and CPT-12 was completed behind the building, between the UST's and the drinking water well Samples were collected at varied depths at both locations Hydrocarbon contamination was reported in the samples from CPT-11 The samples from CPT-12 were non detect for the parameters tested Tank Removals j I Remedy Construction, Inc removed two 10,000 gallon diesel tanks east end of the UST tank it g ( p area) on June 5, 1998 The work was completed in conjunction with upgrade of UST's at the site The soil around the fill end of the tanks showed staining from green to black, and a diesel odor was detected [ The remaining four 10,000 gallon gasoline tanks (west end of the UST tank pit area)were removed by Remedy Construction, Inc on June 10, 1998 The soil around the fill end of the tanks had a gasoline odor Soil samples were taken at each end of the tanks Grab water samples were also collected at each end of the tank pit The results of sampling showed that hydrocarbon contamination was present in the bottom of the excavation Highest levels were reported along the south sidewall of the tank pit Remedv, Inc, Report of Quarterly Sampling of Drinking Water Well August 28, 1998 Frank's One Stop, 2072 W Yosemite Avenue Manteca, CA 015Q398 RPT 2