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File No.249947 29 July 1991 Page 4 <br /> LABORATORY ANALYSES <br /> Samples S-2, S-3, and S-4 were submitted to West Laboratories in Davis, California <br /> for analyses. The samples were analyzed for Total Petroleum Hydrocarbons (EPA <br /> Method 5015) as diesel and motor oil. <br /> The results of laboratory analyses of these samples follows. A complete copy of the <br /> laboratory results is included as Appendix A at the end of this report. <br /> TABLE 1. RESUUPS OF LABORATORY ANALYSES FOR TPH <br /> SAMPLE ITH(ppm) Detection <br /> NUMBER As Diesel As Motor Oil Limit(ppm) <br /> S-2 42. 500. 10.0 <br /> S-3 N D 38. 10.0 <br /> S4 N D N D 10.0 <br /> ABBREVIATIONS: <br /> ppm:parts periilt� (or jngAcg). <br /> N D : substance(s)not detected in laboratory analyses. <br /> Thus, some motor oil and diesel were detected beneath the nothcrn and central <br /> sumps. <br /> REGULATORY ACTION LEVELS <br /> Conservatively evaluated, the site can be classified as falling within the 41 to 48 point <br /> range of the Leaching Potential Analysis ranking system established by the State of <br /> California Regional Water Quality Control Board's Leaking Underground Fuel Tank <br /> (LUFT) Investigation Manual (October 1989). A copy of the Leaching Potential <br /> Worksheet, showing how the site was ranked, is attached. <br /> Vh <br /> [�a Under that classification, action levels for TPH (as diesel) are set at 1000 ppm. <br /> U The levels of diesel contamination detected do not exceed LUFT Manual action <br /> pa,( levels. While specific levels have not been established for TPH in the motor oil <br /> range, it has been our experience that regulators will generally accept diesel standards <br /> for motor oil contaminated soil. <br /> Thus, the levels of contamination encountered do not warrant remediation, based on <br /> LUFT standards. <br /> ANDEON <br /> CONSULTRSING <br /> GROUP <br />