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ARCA®jC Mr.Walter Hanley <br /> .3 December 23,2005 <br /> i <br /> • Advancement of three direct-push temporary borings(S13-1,S13-2, SB-3)at <br /> the Site,and logging of soil lithology in the soil borings; <br /> ■ Collection of two soil samples from each boring(one from the vadose zone <br /> and one from below the groundwater table)and analysis by'a state-certified <br /> analytical laboratory for UST-related analytes, <br /> • Collection of one grab groundwater sample from each boring for laboratory <br /> analysis; and <br /> • Production of this letter report. <br /> Summary of Background Information <br /> The Site is at 2059 Navy Drive in an industrial area in Stockton,-California(Site; <br /> Figure 1).The Site is adjacent to an automotive dismantling facility to the east and a <br /> former fueling station to the west. Railroad tracks border the Site to the north and <br /> there are commercial properties to the south. <br /> Since the mid 1970s,activities at the concrete batch.plant included mixing cement, <br /> fly-ash aggregates,and chemical additives, and filling cement-mixer trucks for off- <br /> site delivery. A water well is located on-site and used for concrete production. <br /> In 1995,the 4,000-gallon diesel UST was removed from the Site. Analytical soil <br /> sample results.indicated that diesel concentrations remained in the soil in the vicinity <br /> of the UST. On February 20,2004,during further excavation of soil at the,location <br /> of the former UST,four additional soil samples and one pit water sample were <br /> collected and analyzed for aromatic hydrocarbons and Total.Extractable Petroleum <br /> Hydrocarbons(TEPH).Residual concentrations of TEPH-diesel were found in two of <br /> the soil.samples.The pit water collected from the base of the excavation contained <br /> TEPH-diesel at a concentration of 900 micrograms per liter(ltgfL).Other related <br /> constituents(benzene,toluene,ethylbenzene,and xylenes)were not detected in any <br /> of the samples. <br /> As a result,the SJCEHD has requested additional investigation of soil and <br /> groundwater at the Site,to evaluate the vertical and lateral extent of impacts from the <br /> UST. ARCADIS developed the field investigation below at the request of LKQ and <br /> with feedback from Mr.Harlin Knoll with the SJCEHD, <br /> gAprojects-activeVkq stocktonVhase ii%2059 navy drive site inv.doc 2/8 <br />