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' Quarterly Report - October 1998 <br /> _ PACIFIC CAR WASH <br /> 4405 Pacific Avenue, Stockton, California <br />' 1.0. INTRODUCTION AND SCOPE OF WORK <br /> Advanced GeoEnvironmental, Inc (AGE) has prepared this Quarterly Report for well installation <br />' and ground water monitoring and sampling activities at 4405 Pacific Avenue (site), Stockton, <br /> California The location of the site is illustrated in Figure 1, general features at the site are illustrated <br /> in Figure 2 <br />' The scope of work p o k ofthis investigation included installation of four off-site ground water monitoring <br />' wells with the objective of assessing and monitoring subsurface impact of petroleum hydrocarbons <br /> This report is prepared in accordance with guidelines established by the San Joaquin County Public <br /> Health Services - EnvironmentaI Health Division (PHS-EHD) and by the Central Valley Regional <br />' Water Quality Control Board for investigation of underground storage tank(UST) sites A summary <br /> of previous investigations at the site was included in the Preliminary Site Investigation and <br /> Evaluation Report -January 1997, dated 15 January 1997 and prepared by AGE <br /> 2.0. PROCEDURES <br /> On 09 and 15 October 1998, monitoring wells MW-7 through MW-10 were installed off-site on 15 <br /> and 19 October 1998, ground water monitoring and sampling was performed at wells MW-1 through <br /> MW-10 <br /> r21 INSTALLATION OF GROUND WATER MONITORING WELLS <br /> On 09 and 15 October 1998, four soil borings/monitoring wells (MW-7 through MW-10) were <br /> advanced off-site as part of site assessment activities related to existing USTs at the site Soil borings <br /> MW-7, MW-8 and MW-9 were advanced vertically to depths of 40 feet below surface grade (bsg), <br /> I MW-10 was advanced to a depth of 55 feet bsg Soil borings MW-7, MW-8 and MW-9 were <br /> advanced utilizing a CME-75 high torque truck-mounted drill rig equipped with 8-inch diameter <br /> hollow stem augers, soil boring MW-10 was advanced utilizing a B-57 truck-mounted drill rig <br /> equipped with 10-inch diameter hollow stem augers Soil cuttings were stockpiled and covered on <br /> plastic sheeting at the site in an area lacking public access The soil boring/monitonng well locations <br /> are depicted in Figure 2 <br /> 2 1 1 Soil Sample Collection <br /> Discrete soil samples were collected at 5-foot intervals beginning at 15 feet bsg from soil borings <br /> Advanced GeoEnvlronmenlal,Inc <br />