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4.0 SOIL SAMPLING AND LABORATORY ANALYSES <br /> 4.1 SOIL SAMPLING <br /> In accordance with Mr. von Flue's instruction, a soil sample was collected at approximately one <br /> foot below each end of the piping trench. Sample PPN-2 was collected at approximately two <br /> feet BGS from the northeastern end of the trench, and sample PPS-2.5 was collected at <br /> approximately 2.5 feet BGS near the southwestern end. Soil sampling locations are shown on <br /> Figure 3. <br /> �. Soil samples were collected using a slide-hammer containing a new, clean stainless steel liner. <br /> Each stainless steel liner was sealed with Teflon sheets and vinyl end caps, labeled, stored on <br /> ice in a thermally insulated cooler, and transported under chain-of-custody protocol to <br /> McCampbell Analytical, Inc., a state-certified analytical laboratory, located in Pittsburg, <br /> California. Reusable sampling equipment was thoroughly washed with a Liqui-Nox solution, <br /> _ rinsed with tap water, and then rinsed with distilled water. <br /> In accordance with guidance from Mr. von Flue, approximately one cubic yard of soil removed <br /> during piping removal activities (from the 1987 excavation backfill) was placed back into the <br /> 1987 excavation. Technical guidance for the soil sampling program was provided by a <br /> California Professional Geologist. <br /> r <br /> 4.2 LABORATORY ANALYSES <br /> The soil samples were analyzed for total petroleum hydrocarbons quantified as gasoline <br /> (TPH-g) and volatile organic compounds (VOCs) including benzene, toluene, ethylbenzene, <br /> w <br /> and xylenes (BTEX), seven fuel oxygenates [methyl tertiary butyl ether (MTBE), tertiary butyl <br /> alcohol (TBA), di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), tertiary amyl <br /> methyl ether (TAME), ethanol, and methanol], and fuel additives [1,2-dibromoethane (1,2- <br /> DBA) and 1,2-dichloroethane (1,2-DCA)] by EPA Method 8260B and total lead by EPA <br /> Method 6010C. <br /> 5.0 ANALYTICAL DATA FOR SOIL <br /> Analytical results for the two soil samples are summarized in Table 1, and the laboratory <br /> analytical report and chain-of-custody documentation are included in Appendix B. <br /> r <br /> TPH-g, BTEX, fuel oxygenates, fuel additives, and remaining VOCs, were not detected in <br /> either sample. <br /> Lead was detected in soil samples PPN-2 and PPS-2.5, at 9.0 and 24 milligrams-per-kilogram <br /> SLAIR 2007.11 Pipline Removal Report 3 <br />