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• each boring for a total of six samples The hand auger was cleaned with water and a non- <br /> phosphate detergent between each of the borings Upon completion of drilling, the <br /> borings were backfilled with bentonite chips which were hydrated with clean water, and <br /> the asphalt pavement patched to surface grade <br /> Soil beneath the site consisted primarily of well sorted very fine- to medium- <br /> grained sand (SW) and poorly sorted medium- to coarse-grained sand (SP) with Iesser <br /> intervals of silty very fine- to fine-grained sand (ML) Similar soil profiles were <br /> encountered in borings B-1 and B-2 which is presented in Type Boring Log A, and in <br /> borings B-3 through B-6 which is presented in Type Boring Log B Boring logs are <br /> presented in Attachment A All of the samples collected for laboratory analysis consisted <br /> of poorly sorted unconsolidated sand that is very porous and permeable None of these <br /> samples indicated the presence of petroleum hydrocarbons based on field observations <br /> with the exception of boring B-1 which had a faint gasoline odor <br /> Soil samples were capped with teflon tape and plastic end caps, and sealed to the <br /> brass liner with duct tape Samples were maintained in a cooler chest with frozen gel <br /> packs ("blue ice"), and maintained at a minimum of four degrees Celsius until delivered <br /> to the laboratory <br /> i <br /> Laboratory Analysis <br /> • Soil samples were analyzed for gasoline-range total petroleum hydrocarbons <br /> (TPH), benzene, toluene, ethylbenzene, and xylenes (BTEX), and methyl tertiary butyl <br /> ether (MTBE) Analysis was performed using EPA method 8015M for TPH and EPA <br /> method 8020 for BTEX and MTBE Samples were analyzed by a laboratory certified by <br /> the State of California for those methodologies <br /> Laboratory analytical results indicate that none of the samples contained gasoline <br /> constituents with the exception of boring B-1 which contained trace concentrations of <br /> toluene, xylenes, and MTBE Laboratory analytical results are summarized in Table 1 <br /> below Certified analytical results are presented in Attachment B <br /> Table 1 <br /> Laboratory Analytical Results Super Stop Market Manteca <br /> Sample TPH Benzene Toluene Ethylbenzene Xylenes MTBE <br /> B-1 @ 17' ND ND 0078 ND 029 1 5 <br /> B-2 @ 17' ND ND ND ND ND ND <br /> B-3 @ 17' ND ND ND ND ND ND <br /> B-4 @ 17' ND ND ND ND ND ND <br /> B-5 @ 17' ND ND ND ND ND ND <br /> B-6 @ 17' ND ND ND ND ND ND <br /> • ND=below detectable concentrations <br />