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•y <br /> 14 August 1991 <br /> GeoAudit CV 43CS-1.3 <br /> Page 4 of 4 <br /> 4 . Detectable concentrations of metal ions are probably due to <br /> naturally occurring inorganic compounds in the soil. In <br /> particular, sidewall and bottom samples contain a fairly <br /> uniform concentration of lead that varies only slightly <br /> between 5. 5 and 8 .4 ppm. The exception is MCSW-1, which also <br /> contained high concentrations of diesel and motor oil. After <br /> reexcavation, concentrations of diesel and oil dropped to ND, <br /> but total lead dropped only slightly to 7.1 ppm, still within <br /> the range for lead in other sidewall samples and considerably <br /> lower than the lead concentrations in the soil stockpiles. <br /> Because lead is less mobile in soil than either diesel or <br /> motor oil, it is highly unlikely that this lead has leaked <br /> from the waste oil tank and migrated laterally farther than <br /> the diesel and motor oil. Rather, it probably occurs naturally <br /> in the local soil. <br /> 5. The excavated soil is non-hazardous according to DHS <br /> guidelines. <br /> • RECOMMENDATIONS <br /> We recommend that you tranmit a copy of this report to San Joaquin <br /> County Environmental Health Division. Based on the results of <br /> sampling and laboratory analysis, we believe that the contamination <br /> has been successfully removed and that EHD will grant approval to <br /> transport the stockpiled soil to an approved disposal facility. <br /> This soil should be hauled by a properly licensed firm under non- <br /> hazardous manifest. <br /> lP� <br /> We also recommend that you apply for permission to fill the <br /> excavation with clean fill material and resurface the garage floor. <br /> We recommend that you contact San Joaquin EHD and request <br /> authorization for site closure. <br /> We appreciate the opportunity to prepare this report. Please <br /> contact our office if you have any questions. <br /> Sincerely, <br /> GE7kCAI AUDIT SERVICES, INC. cfa <br /> Victor B. Cherven, Ph.D. ft 3475 <br /> Project Geologist <br /> Registered Geologist No. 3475 <br /> cc: James Hoblitzell, Falcon Energy L <br />