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1 <br /> samples (STP-1, and STP-2). At the direction of Michael Kith, five undisturbed soil samples <br /> were collected from under the concrete vault containing the UST piping on August 14, 1997. <br /> The soil samples from the tank excavation floor were collected from native soil in the <br /> backhoe or excavator bucket, utilizing two-inch by six-inch brass sleeves. The UST <br /> overburden stockpile samples were collected using a sample coring device containing two <br /> inch by six inch brass sleeves. The sample corer was driven into each desired sampling <br /> location using an attached slide hammer. <br /> On May 14, 1997, following excavation activities of the diesel tank, five (5) undisturbed soil <br /> samples (PBST-Pl, PBST-P2, PBST-P3, PBST-P4 and PBST-P5) were collected from under <br /> the concrete vault containing the former tank piping. Samples were collected using a hand <br /> held slide hammer with attached coring device. Hand auger borings were angled beneath the <br /> vault to a depth of three feet below grade to facilitate soil sampling, as discussed with <br /> SJCEHD inspector Michael Kith. Soil sampling locations are shown on Figures 3 and 4. <br /> After collection and labeling, the samples were immediately put on ice and cooled to <br /> approximately 4*C. Chainof Custody documentation accompanied all samples from the time <br /> of collection to the time of delivery to the designated laboratory. Copies of the Analysis <br /> Request and Chain of Custody records for all samples are included in this UST removal <br /> report as Appendix D. <br /> 2.3 Sample Analysis <br /> A <br /> ' The methods utilized in the analysis of the UST excavation, overburden stockpile soil <br /> samples, and the piping vault soil samples were modified EPA method 8015 for total <br /> petroleum hydrocarbons (TPH) as diesel, and EPA method 8020 used for benzene, toluene, <br /> ethyl benzene, and xylenes (BTEX). All method 8015 and 8020 analyses for the samples <br /> collected the day of tank removal, were completed on site using the mobile laboratory <br /> supplied by Sparger Technology, Incorporated (Sparger). The method 8015 and 8020 <br /> analyses for the piping vault soil samples were completed by Sparger in their Sacramento, <br /> ' California stationary laboratory facility. <br /> Analysis of the diesel tank excavation verification samples (PBST-DN, PBST-DE, PBST-DS, <br /> and PBST-DW) revealed no detectable petroleum hydrocarbons. <br /> cAsydney\pbstock.ust 3 <br /> II! , <br />