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a r <br /> ­MW <br /> Im <br /> • <br /> f <br /> 1Soly,AaSOSSMENTED TO <br /> REMOVAL.OT UNDE3V.RQU.KD TLIIKS <br /> 630 W=t Charter War,Stockton,California <br /> D&Ita Prolact No.40-e6-536 <br /> Pada 8 <br /> Soil samples will be collected at a vtrtical spacing of five feet. Borings will he advanced to a <br /> minimum depth of 30 feet or until three consecutive soil samples(representing 15 feet of borehole) <br /> show non-detectable levels r-f contamination. Soils will be screened with a portable photoionization <br /> detector,as described in Section 3.2,to determine organic-vapor content. The level of contamination <br /> will be considered non-detectable if organic-vapor content is comparable to background levels. A r <br /> "clean"sample will be submitted for laboratory analysis to verify the field determination. <br /> x Egli Sample Cpjlegtton and Scretningf <br /> Soil samples will be recovered using brass sample tubes within a California-modified split-barrel <br /> sampler. The br85s tube will be capped, packaged, and preserved according to accepted EPA <br /> procedures for possible chemical analysis. A sample collected adjacent to the brass tube will be ,I <br /> sealed in a glass jar. All soil samples collected in glass jars will be brought to the same temperature �' 1 <br /> and screened for.total organic vapors utilizing a portable photoionization deflector. Appendix B. <br /> Section 1.3 describes the soil-screening procedure. Based on this information,soil samples will be <br /> selected for chemical analysis. ' <br /> t . <br /> 1 3,2 Chemical Analyses- l 1 <br /> 1 ( ! <br /> Based okr results of soil-sample screening,soil samples will be selected for chemical analysis. The soil <br /> samples will be analyzed for TPH by EPA Method 8015. Those samples with TPH concentrations 4 <br /> I exceading 100 ppm will be analyzed for BTEX by EPA Method 8020. <br /> 1 <br /> 4.0 SCHE_D!1.1; �1 <br /> Delta will proceed with thB work outlined in this plan as soon as approral is obtained. A drill crew l <br /> will be mobilized to chill the proposed borings within two weeks of approval of this plan. Laboratory <br /> 4 analysis of soil samples generally requires three weeks. A summary report of our results will be <br /> prepared within three weeks after laboratory results are received. ` <br /> j <br /> t <br /> i <br /> t <br /> 4' <br /> r <br /> j. <br /> { <br /> 4 ; <br /> ..ltst�o <br />