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F <br /> ASS O C I ATE S I N C . <br /> Table 1. Soil sample locations, as presented in HeIrr,ick and Lerner's work plan, are shown on <br /> Figure 3. <br /> F2.0 METHODS AND PROCEDURES <br /> To evaluate the presence of petroleum hydrocarbons in soil a total of <br /> two soil borings were � <br /> advanced at the site. These soil borings were placed at the north end and central area the former <br /> F diesel UST. All field activities were performed in ac ordance with Helmick and Lerner's Work <br /> F, <br /> Plan for Soil Investigation, Edison High - Stockton Unified School District, dated February 6, <br /> 1998 and ATC's Site Safety Plan and Quality Assurance/Quality Control Plan (QA/QC Plan) <br /> F, submitted to PHS/EHD on February 1, 1999. <br /> I <br /> 2_1 Soil Boring Advancement and Sam lin <br /> FI: ' <br /> On February 16, 1999, ATC supervised the advancement of two soil borings (SBI and SB2) in <br /> { the vicinity of the former diesel UST. Drilling wasperformed by employing a Geoprobe® <br /> = method of direct push technology (DPT). <br /> F7� Soil Borings SB 1 and SB2 were advanced to depths Df 31 and 30 feet bgs, respectively. Both <br /> soil borings were advanced at an approximate angle of 30 degrees from vertical to obtain soil <br /> samples beneath the existing concrete cradle on whichthe site's former 10,00-gallon diesel tank <br /> Fonce rested. Soil samples were collected from the two borings at a minimum of four-foot <br /> intervals in acetate sampling tubes and were described according to the Unified Soil j <br /> Classification System. The soil samples and drill cuttings were characterized for soil type, <br /> F! moisture content, and visual evidence of petroleum hydrocarbons. <br /> A flame ionization detection meter (FID) was used as a field-screening device for the detection <br /> F� of petroleum hydrocarbon vapors in cored samples. Descriptions of soil types encountered and <br /> sample collection intervals are included on the boring logs contained in Appendix A. <br /> FFollowing soil sample collection, the borings SBI and SB2 were backfilled with neat cement <br /> grout to the ground surface. <br /> 2.2 Soil Samplg.Analysis <br /> PSelected soil samples were placed on ice, and transported under chain-of-custody to Sequoia <br /> Analytical (ELAP #1210) of Redwood City, California for analysis. The soil samples were <br /> analyzed for TPHd by EPA Method 8015 and BTFX by EPA Method 8020. The analytical <br /> Fjresults for soil samples are summarized in Table 1. L iboratory data sheets with chromatograms <br /> and chain-of-custody documentation are included in Appendix B. <br /> F! <br /> w:1172921reportslsumwel.doc 2 <br />