Laserfiche WebLink
CLEARWATER <br /> G R O U P I N C <br /> • Fl1Vi/0n nlCTT tn� $f iVitfS <br /> removed during the TreaTek work was returned to the former tank excavation following the lining <br /> of the pit with plastic Tank disposal certification is provided in the prepared report <br /> A groundwater quality assessment was completed by McLaren/Hart in late 1992 As documented <br /> in their February 3, 1993 Preliminary Site Assessment Report, samples drawn from the five newly <br /> installed groundwater monitoring wells indicated the presence of moderate to low concentrations of <br /> gasoline-range contamination Based on the results of testing completed during and following the <br /> UST removal, additional soil excavation was conducted in June, 1993 A total of 360 cubic yards <br /> of soil was excavated, sampled and transported to Forward Landfill for appropriate land treatment <br /> and disposal Manifests are included in the prepared report <br /> In accordance with a workplan submitted to and approved by the San Joaquin County PHS/EHD, <br /> McLaren/Hart completed additional site characterization activities in October, 1993 Task efforts <br /> included drilling eight additional soil borings, the installation of a vapor extraction well, and the <br /> completion of a vapor extraction pilot test The results of these activities were presented in <br /> • McLaren/Hart's December 22, 1993 report entitled Evaluation of Remedial Alternatives for <br /> Petroleum Impacted Soil This report documented the presence of concentrations of gasoline range <br /> contamination in several of the areas sampled The maximum concentration of TPH as gasoline <br /> detected was in boring SI-5 (360 mg/kg), located along the eastern property boundary <br /> Concentrations detected in samples collected from other borings were either low or below <br /> detectable levels No groundwater samples were collected from any of the eight borings <br /> A final round of invasive investigation was conducted by Kennedy/Jenks Consultants in early <br /> 1995 The scope of services completed by Kennedy/Jenks included the drilling and sampling of <br /> eight soil borings Three of the borings were completed within the property boundary of the <br /> subject site, five borings were drilled on adjoining or nearby properties Soil samples were <br /> collected and analyzed from all eight borings, water samples were collected from seven borings and <br /> analyzed by means of an on-site lab The results of analysis, documented in the Kennedy/Jenks <br /> Supplemental Site Investigation report dated May, 1995, indicated that low to moderate <br /> concentrations of gasoline-range hydrocarbons were present in the soil immediately beneath the <br /> former tank excavation in the vicinity of sample UGS (collected following UST removal in 1992) <br /> and in groundwater near the eastern border of the site Results of analysis of soil and water <br /> 2 <br />