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1 <br />' OVER EXCAVATION <br /> SOM SAMPLING RESULTS <br />' D, Salvo Tr idk ft <br /> 1444 Lathrop Road <br /> Lathrop, California <br />' Jane 21, 1994 <br />' 1.0 INTRODUCTION <br />' This report describes the over-excavation of petroleum <br /> contaminated soil at the Di Salvo Trucking facility located at <br /> 1444 Lathrop Road in Lathrop, California as shown in Figure 1, <br />' Appendix A. The report was prepared by Condor Earth Technologies <br /> Inc. (Condor) at the request of Mr. Keith Tallia, Oil Equipment <br />' Service (OES) , San Andreas, California. This report includes a <br /> brief site history, a description of the field work, a discussion <br />' of the laboratory analyses and recommendations based on findings . <br /> 2.0 SITE HISTORY <br /> Seven USTs were removed from the site by OES on August 11, <br /> 1993. The contents of the tanks were diesel, motor oil, and <br /> waste oil. The former locations of the tanks are shown in Figure <br />' 2, Appendix A. Condor personnel were on site during the tank <br /> removal to make field observations and collect soil samples . <br /> Laboratory analysis detected 80 mg/kg diesel and 350 mg/kg motor <br /> oil in the soil sample collected beneath the east end of TK4 at a <br /> depth of 13 .5 feet below ground surface. Grey petroleum staining <br /> was noted on the east sidewall at the fill (east) ends of TK3, <br /> TK4, and TK5 to a depth of approximately 8 feet. Groundwater was <br />' not encountered during the tank removal. <br /> IBased upon the results of laboratory analyses of soil <br /> samples collected beneath the former tank locations, Condor <br /> recommended over-excavation of the east sidewall near TK4. A <br /> complete description of the tank removal and the results of <br /> I m� <br /> �� CONDOR <br />