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MODMED GROUNDWATER SAMPLING REPORT <br />' Di Salvo Trucking <br /> 1444 Lathrop Road <br />' Lathrop, California. <br /> San Joaquin County <br />' Prepared by <br /> CONDOR EARTH TECHNOLOGIES, INC. <br />' August 31, 1995 <br />' 1.0 INTRODUCTION <br /> This report presents the findings from modified groundwater sampling of MW1 located at the <br /> Di Salvo Trucking facility at 1444 Lathrop Road in Lathrop, California The modified groundwater <br />' sampling was conducted to evaluate the lateral extent of groundwater contamination associated with <br /> former underground storage tanks (USTs) at the site The location of the Di Trucking facility is <br />' shown on Figure 1, Appendix A, and the location of MW1 and the former USTs labeled TKl <br /> through TK7 are shown on Figure 2, Appendix A This report was prepared by Condor Earth <br /> Technologies, Inc , (Condor) at the request of Mr Charlie Lawlor of Di Salvo Trucking <br /> 2.0 SITE BACKGROUND <br />' 2.1 Tank Removal <br /> Seven underground storage tanks were removed from the site on August 11, 1993 The <br />' contents of the tanks were diesel, motor oil, and waste oil Laboratory analysis detected 80 mg/kg <br /> diesel and 350 mg/kg motor oil in the soil sample collected from beneath the east end of TK4 at a <br />' depth of 13 5 feet below ground surface (bgs) Grey petroleum staining was noted on the east <br /> sidewall at the fill ends of TK3, TK4, and TK5 to a depth of approximately S feet No other <br /> evidence of hydrocarbon contamination was detected during the UST removal and groundwater was <br />' not encountered A complete description of the tank removal is in Underground Storage Tank <br /> Removal, Soil Sampling Results, prepared by Condor, October, 14, 1993 <br />' 2.2 - <br /> Over excavation <br />' On May 6, 1994, the east sidewall near the former location of TK4 was over-excavated <br /> eastward approximately 4 feet and the floor of the excavation was extended to a depth of <br /> approximately 15 5 feet bgs Excavated soil was visually inspected for petroleum staining and tested <br />' with a portable organic vapor analyzer (OVA) Two soil samples were collected from the east <br /> isidewall at approximately 15 feet bgs and one soil sample was collected from the floor at a depth of <br />' �f� CONDOR <br />