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2.3 Sample Preparation <br /> Soil samples were prepared/preserved in the field for subsequent laboratory analysis. The ends <br /> of each sample tube were sealed with Teflon film, plastic end caps. and tape. The samples were <br /> then labeled, logged onto a chain-of-custody record, and placed in a cooler containing dry ice <br /> for transport to a State of California certified testing laboratory. <br /> 2.4 Site Cleanup <br /> i <br /> At the completion of drilling, the boreholes were backfilled with grout in accordance with San <br /> ' Joaquin County regulations. Ms. Diane Hinson of the SJCPHS witnessed the grouting of the <br /> boreholes. <br /> 1- <br /> 3.0 SAMPLE ANALYSES <br /> r- <br /> Upon completion of the field sampling, the soil samples were returned to RES' office in <br /> Richmond, California. On 29 September 1994, the cooler containing the soil samples was <br /> transported to Superior Analytical Laboratory located in Martinez, California. Chain-of-custody <br /> I documentation accompanied the samples from time of acquisition until delivery to the laboratory. <br /> The samples were analyzed for total petroleum hydrocarbons as diesel (TPHd) by EPA Method <br /> 3510/8015 and the fuel components benzene, toluene, ethylbenzene, and xylenes (BTEX) by <br /> EPA Method 8020. <br /> The results of the laboratory analyses indicate that TPHd and BTEX compounds were not <br /> present in the soil samples at concentrations above the detection limits. A summary of the <br /> results of the soil sample analysis is presented below in Table 1. Laboratory data sheets and the <br /> { accompanying chain-of-custody record are provided in Appendix D. <br /> TABLE 1. Summary of Soil Sample Analytical Results <br /> L <br /> Sample Sample TPH Ethyl- Total <br /> ID Date Diesel Benzene Toluene benzene Xylenes <br /> (borehole-depth) (Md-y) (mg/7) (mg/l) (mg/l) (mg/1) (mg/1) <br /> B1-D16 9-28-94 <10 <0.005 <0.005 <0.005 <0.005 <br /> i B2-1316 9-28-94 <10 <0.005 <0.005 <0.005 <0.005 <br /> B2-1321 9-28-94 <10 <0.005 <0.005 <0.005 <0.005 <br /> B3-D17 9-28-94 <10 <0.005 <0.005 <0.005 <0.005 <br /> B3-D21 9-28-94 <10 <0.005 <0.005 <0.005 <0.005 <br /> B4-D16 9-28-94 <10 <0.005 <0.005 <0.005 <0.005 <br /> Notes: mg/1 Milligrams per liter or parts per million(ppm). <br /> <10 Indicates that the constituent analyzed was not detected at a concentration above <br /> fthe stated detection limit. <br /> 1 . <br /> 4W\CBw1ASPRJNT.Rr[Y)0C V4 4 <br />