Laserfiche WebLink
' Ground Water Extraction Feasibility Test Report <br />' Former CHASE CHEVROLET Van Buren Facility <br /> 424 North Van Buren Avenue, Stockton, California <br />' 1.0 INTRODUCTION <br />' Advanced GeoEnvironmentai, Inc (AGE) has prepared this ground water extraction test report for <br /> 424 North Van Buren Avenue, Stockton, California The site setting is illustrated on Figure I Site <br /> structures and monitoring well locations are depicted on Figure 2 This report has been prepared in <br />' accordance with guidelines established by the California Regional Water Quality Control Board - <br /> Central Valley Division for investigation of underground storage tank (UST) sites <br />' The objective of the work was to obtain general ground water aquifer characteristics and to evaluate <br /> aquifer response to ground water extraction at a constant pumping rate Based on previous <br /> investigations, AGE has identified two potential hydrogeologic units informally identified as the <br /> t upper and lower water zones These two zones are separated by approximately 5 to 10 feet of clay <br /> and silty clay It is not known how effectively the intervening fine grained interval hydrologically <br /> separates the informal hydrogeologic units though some contamination has migrated through or <br />' around them. Site background information was summarized in Revised Corrective Action Plan - <br /> February 1997,Site Investigation Report-USTNo 8,dated 10 February 1998 and Quarterly Report <br /> -August 1998, prepared by AGE <br /> 2.0. BACKGROUND <br /> In 1986, one 1,000-gallon underground storage tank (UST), UST No 7, was removed by Falcon <br /> 1 Energy Associates(FEA)from an excavation north of the small building Hydrocarbon-impacted soil <br /> was encountered beneath the UST during removal Due to the presence of high concentrations of <br /> hydrocarbons and the shallow depth to ground water, further assessment investigation was required <br /> Between 1990 and 1994, four ground water monitoring wells (MW-3, MW-6, MW-7 and MW-9) <br /> and three soil borings (SB3, SB4 and SB5) were drilled and installed on the site to delineate the <br /> extent of hydrocarbon-impacted soil and ground water in the vicinity of the former UST <br /> Hydrocarbon-impacted soil and ground water were encountered in each boring The findings were <br /> presented in a March 1991 Progress Report and August 1994 Summary Report/Additional Site <br /> Investigation prepared by Resna Industries <br /> On 17 and 18 July 1995, sixteen soil probe borings were advanced on and around the site Soil <br /> samples were collected from five probe borings and water samples were collected from eleven probe <br /> borings, delineating the extent of the impacted soil and ground water Details and results of the <br /> probing investigation were summarized in the Quarterly Report-June 1995, dated 25 August 1995, <br /> prepared by AGE <br /> Advanced GeoEnvironmental,Inc <br /> do <br />