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MONITOR WELL INSTALLATION 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 /> June 28, 199 <br /> 1.0 INTRODUCTION <br /> This report was prepared by Condor Earth Technologies, Inc., (Condor) to describe the installation of <br /> one monitor well (MW 1) at the Di Salvo Trucking facility located at 1444 Lathrop Road in Lathrop, <br /> California. The location of the Di Salvo Trucking facility is shown on Figure 1, Appendix A. The monitor <br /> well was installed to meet the guidelines presented in the Tri-Regional Board Staff Recommendations for <br /> Preliminary Evaluation and Investigation of Underground Tank Sites (Tri-Regional Guidelines). This report <br /> was prepared by Condor at the request of Mr. Charlie Lawlor, president of Di Salvo Trucking. <br /> 2.0 SITE HISTORY <br /> 2.1 Tani: Removal <br /> On August IL 1993, seven underground storage tanks (USTs) were removed from the site. The <br /> T contents of the tanks were diesel, motor oil, and waste oil. Laboratory analyses of the soil sample collected <br /> from beneath the cast end of the former location of one 10,000-gallon diesel UST (TK4) at approximately <br /> 13.5 feet below ground surface (bgs) detected 80 mg/kg diesel and 350 mg/kg motor oil. During removal of <br /> the USTs, grey petroleum staining was noted to a depth of approximately 8 feet on the east sidewall of the <br /> excavation, adjacent to the fill ends of TK3, TK4, and TK5. No evidence of hydrocarbon contamination was <br /> detected at or above the reported laboratory detection limits in any of the retraining soil samples collected <br /> from beneath the former USTs located at the site. Eleanor Ratliff of San Joaquin County Public Health <br /> Services, Environmental Health Department (SJCPHS,EHD) was on site to identify soil sample locations and <br /> select laboratory analyses. The former UST locations are shown on Figure 2, Appendix A. Historical <br /> analytical results are presented in Table 1, Appendix B. Based on the results of laboratory analyses of the soil <br /> samples collected from the site, Condor recommended over-excavation of soil at the east end of the former <br /> location of TK4. <br /> AAo��. <br /> L!� CONDOR <br />