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7720 LORRAINE AVENUE SUITE 105 STOCKTON, CA 25210 PHONE. 209-957-3405 w 6 November 1990 f Robert M. 5engebush, R.G. - Senior Project Geologist Ray F. Weston, Inc. 83 W. March Lane, Suite 12 Stockton, CA 95207 RE: Siebold Corporation -Luft Investigation " 820 South American Street Stockton, California Dear Rob: The soil samples received by our laboratory for the above referenced project were analyzed for Benzene, Toluene, Xylenes, Ethyl Benzene (BTXE) and Total Petroleum Hydrocarbons (TPH) in accordance with the detection limits established in the October 1989 LUFT (RWQCB Guidance) Manual and EPA SW -846 3rd Edition. b, The BTXE analysis was performed by EPA SW -846 Method 8020 as �. recommended by the LUFT Manual. As outlined in the table below, the optimal laboratory detection limits for ETXE are well below the 0.3 ppm detection limit outlined in the LUFT Manual. Because the final results are corrected for percent moisture, the rn detection limits for these analytes in the Siebold data are slightly higher due to the high moisture content in the soil samples. " Stockton Laboratory LUFT Detection Limits W (ma/L) SLmq W m I, S(mqJkqJ Benzene 0.30 0.30 0.0005 0.025 Toluene 0.30 0.30 0.0005 0.025 �. Xylene 0.30 0.30 0.0005 0.025 Ethyl Benzene 0.30 0.30 0.0005 0.025 The Total Petroleum Hydrocarbons analysis was performed by EPA .� SW -846 Method 8015, as modified by the California Department of Health Services. Table 3-6 of the LUFT Manual establishes a detection limit for TPH analysis of soil samples at 10 mg/kg. If we calculate the detection limit based upon the method outlined, the detection limit is actually 25 mg/kg. The laboratory has modified the DHS method k1y using 30g of soil sample, rather than 20g as specified by the method, to achieve a detection limit of 17 mg/kg. I: M