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I <br /> April 15, 1993 Working To Restore Nature <br /> ARCO Service Station No 2076, Lode, California <br /> I <br /> aboratory Analyses <br /> Selected soil samples from the borings and the composite samples from the drill cuttings <br /> I <br /> were submitted to the laboratory for analysis of total petroleum hydrocarbons as gasoline <br /> (TPHg) and benzene, toluene, ethylbenzene, and total xylene isomers (BTEX) using <br /> modified Environmental Protection Agency (EPA) Methods 8015 and 8020, respectively <br /> I The composite sample was also analyzed for soluble lead, corrosivity, ignitabilety, and <br /> reactivity Results of chemical analyses of soil samples are presented in Tables 1 and 2 <br /> Groundwater samples were analyzed for TPHg and BTEX using modified EPA Methods <br /> 8015 and 602, respectively The water sample collected from well MW-4 was also analyzed <br /> I for total and fecal coliform bacteria and nitrate The samples were analyzed by Seqouia <br /> Analytical Laboratory (Hazardous Waste Testing Laboratory Certificate No 1624) Copies <br /> of the laboratory reports and Chain of Custody Records are in Appendix C Results of <br />, . ground-water subjective analysis are presented in Table 6, and results of chemical analyses <br /> of water samples are presented in Table 7 <br /> SITE CONDITIONS <br /> Site Geology <br /> Two generalized cross-sections A-A' and B-B' (Plates 3 and 4) were constructed using the <br /> Logs of Borings The surface trace of these cross-sections is shown on Plate 2 Cross <br /> section A-A' shows our interpretation of the soil stratigraphy beneath the site in the east- <br /> west direction, and cross section B-B' shows our interpretation of the soil stratigraphy in the <br /> north-south direction <br /> Sediments underlying the site consist primarily of fine- to coarse-grained sand interbedded <br /> with silt and clay The sedimentary units are generally continuous From approximately 30 <br /> .30OM-s 8 <br />