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' Kennedy/Jenks Consultants <br /> •' <br /> 11 feet bgs, modified as needed based on sample recovery) and analyzed for total and <br /> soluble lead. <br /> onsecutive <br /> ix <br /> s was <br /> Because previous groundwater lead was notltoring of deteccted in in any completed three <br /> quarters and dissolved <br /> of he groundwater samples, no further <br /> groundwater sampling was proposed for OU-1. <br /> 2,1.2 Operable Unit 2 <br /> Sample locations were selected within each AOI of this OU to assess potential chemical <br /> impacts associated with former site improvements and associated activities, including possible <br /> waste disposal or storage in the former ponds, oil storage and transmission, railroad-related <br /> maintenance and repair, and railroad tracks. Kennedy/Jenks collected soil and reconnaissance <br /> groundwater samples from <br /> the ed nfive TableOsl1 and12Oand summarizedtions shown by AOI below. Figure 4. The <br /> sampling program is de <br /> AOI 4— Ponds: Three soil borings, one in the vicinity of each former pond, were <br /> advanced to characterize this area. Soil samples were collected from each boring at four <br /> depth intervals (generally 0 to 0.5 feet, 2 to 3 feet, 5 to 6 feet, and 10 to 11 feet bgs <br /> modified as needed based on sample recovery). Since previous uses of the ponds are <br /> not documented, these samples were analyzed for a range of potential constituents, <br /> including TPHd, TPHmo, VOCs, SVOCs and Title 22 total metals. Additionally, one soil <br /> sample from 0 to 0.5 feet bgs was analyzed for creosote due to the presence of timber <br /> debris currently stockpiled in this AOI. Boring OU2-AO14-GW-1 was chosen for collection <br /> of a groundwater sample. The groundwater sample was analyzed for TPHd, TPHmo, <br /> and VOCs. <br /> Tank: Four soil <br /> • AOI 5— Oil borings were advanced in this area to assess whether <br /> undocumented operations associated with oil storage and transmission infrastructure on <br /> lcollection <br /> the site, including th ab n aroeleas und it tank, o <br /> pet oleum hydrocarbonsothedrainscompounds. <br /> pipes, may have res <br /> One boring was located near each of the following features: <br /> ■ Grass swale <br /> ■ Oil collection drain at the end of the grass swale <br /> i ■ Oil pipe and the oil tank <br /> ■ Oil tank and the oil pump house <br /> Soil samples were collected at four depth intervals (generally 0 to 0.5 feet, 2 to 3 feet, <br /> 5 to 6 feet, and 10 to 11 feet bgs, modified as needed based on sample recovery), and <br /> analyzed for TPHd, TPHmo, VOCs and SVOCs. Boring OU2-AO15-GW-1 was chosen <br /> for collection of a groundwater sample. The groundwater sample was analyzed for <br /> TPHd, TPHmo, and VOCs. <br /> • AOI 6— Roundhouse: Five soil borings were advanced to assess whether <br /> undocumented operations associated with former oil storage and transmission <br /> • infrastructure (oil sump and former railroad-related maintenance facilities) or repair <br /> DRAFT Phase I Remedial investigation Report <br /> Page 12 <br /> Former Tracy Railyard, Tracy, California <br /> g:Us-group\admin)ob\05\0565777.18_uprr109-reports\ri rpt\textdoc <br />