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Kennedy/Jenks Consultants <br /> • lin Plan <br /> Section 2: Field Samp J <br /> Ian for sampling and analysis of soil <br /> Considering existing information and the RI objectives, a p identified in Tables 1 and 2, for <br /> and groundwater was developed for each OU and included <br /> Ibelow and identified RI Work Plan. Samples <br /> collected from each AOI of each OU are summarize osed sampling locations in OU-1 through <br /> soil and groundwater matrices, respectively. The proshown on Figure 3 and the final sampling <br /> OU-4 are superimposed on the valuation map <br /> locations for all five OUs are shown on Figure 4. <br /> Some modifications to the sampling plan were made during the field activities in response to <br /> conditions and observations. Dense subsurface material <br /> I in some a <br /> In AOI 10,ras obseas in ervations of U <br /> field their projected depth. <br /> prevented some borings from reaching p 1 <br /> ved <br /> tions <br /> own in <br /> re mo <br /> subsurface hydrocarbons were made, boring locationserOAdditional soihbor ngst e <br /> Addendum in order to evaluate the lateral extent of the hydrocarbons. <br /> were advanced near AOI 10 to evaluate the westward <br /> include the three treent of the pches shown on <br /> The <br /> proposed trenching program in AOI 12 was modified <br /> Figure 4. <br /> ' 2A A Operable Unit 1 <br /> Kennedy/Jenks collected soil samples at the locations <br /> of lead in soon il. The sampling programgure 4 from the three oor in <br /> ,• OU-1 to further assess the vertical and latera <br /> each AOI is presented in Table 1 and described below. <br /> • AOI 1 — Remediated Soils: Two soil borings were advanced near areas formerly <br /> remediated by excavation and backfilled with imported fill material during prior site <br /> activities. Soil samples were collected adjacent to former excavation limits at depths <br /> corresponding to and beneath the fill areas. Analytical results from these samples will be <br /> used to characterize the potential for lead impacts to soil previously characterized as <br /> clean. Soil samples were collected from each boring at four depth intervals (generally <br /> 0 to 0.5 feet, 0.5 to 1.5 feet, 5 to 6 feet, and between 9 and 11 feet bgs, modified as <br /> needed based on sample recovery) and analyzed for total and soluble lead. <br /> • AOI 2 — Stabilized Lead: Six soil borings were advanced to facilitate lateral and vertical <br /> 1 characterization of lead concentrations in soil containing previously stabilized lead. Soil <br /> samples were collected at depths within and beneath the vertical limits of the former <br /> excavation area. Soil samples were collected from each boring at three depth intervals <br /> (generally 1 to 3 feet, 5 to 6 feet, and 10 to 11 feet bgs, modified as needed based on <br /> sample recovery) and analyzed for total and soluble lead. <br /> • AOI 3 — Residual Elevated Lead: Ten soil borings were advanced around the perimeter <br /> of the stabilized lead area to assess lead concentrations in soil previously characterized <br /> as containing elevated concentrations of lead. Analytical results from these samples will <br /> be used to characterize the lateral and vertical extent of potential lead impacts to soil <br /> where soil remediation has not yet been performed. Soil samples were collected from <br /> • each boring at several depth intervals (generally near surface, 5 to 6 feet, and 10 to <br /> Lit DRAFT Phase 1 Remedial Investigation Report Page 11 <br /> Former Tracy Rai/yard, Tracy, California <br /> g:lis-groupl admin job 10510565777.18_uprr109-rep0rt51d rptl text d0c <br />