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I <br /> Well Installation Report - July 2003 <br /> • TOP FILLING STATION <br />' 101 South Wilson Way, Stockton, California <br /> 1.0. INTRODUCTION <br /> Advanced GeoEnvironmental, Inc (AGE) has prepared this well installation report for 101 South <br />' Wilson Way, Stockton, California,in accordance with guidelines issued by the California Regional <br /> Water Quality Control Board (RWQCB) - Central Valley Region for investigations of underground <br /> storage tank (UST) sites The report documents procedures and results for the installation of two <br />' ground water extraction wells and one ground water monitoring well at the site during July 2003 <br /> The location of the site is illustrated in Figure 1, general features at the site are illustrated in Figure <br />' 2 A summary of previous investigations at the site was included in the AGE-prepared Quarterly <br /> Report - Third Quarter 2002, dated 13 December 2002 <br />' The scope of work of this investigation included installation of two ground water extraction wells <br /> (EW-1 and EW-2) with the objective of on-site interim ground water remediation in the area of <br /> highest methyl tertiary butyl ether(MTBE)contamination utilizing a `pump-and-treat' technology, <br />' one ground water monitoring well (MW-8) was installed at the site with the objective of assessing <br /> the impact of petroleum hydrocarbons to ground water in the western section of the site <br /> iThe following is a brief summary of events for the July 2003 well installation activities performed <br /> at the site <br />' • 23 July 2003 -Ground water extraction well EW-1 and groundwater monitoring well MW-8 <br /> were installed to 55 feet below surface grade (bsg), soil samples were collected during <br /> drilling at five foot intervals <br />' • 24 July 2003 - Ground water extraction well EW-2 was installed to 55 feet bsg, soil samples <br /> were collected during drilling at five foot intervals <br />' • 31 July 2003 - Well development activities performed at wells EW-1, EW-2 and MW-8 <br /> • 04 November 2003-Elevation and Global Positioning System(GPS)survey of wells EW-1, <br />' EW-2 and MW-8 <br />' 2.0. DRILLING AND SAMPLING PROCEDURES <br /> On 23 and 24 July 2003, ground water extraction wells EW-1, EW-2 and ground water monitoring <br />' well MW-8 were installed at the site Soil borings for EW-1, EW-2 and MW-8 were advanced <br /> vertically to maximum depths of 55 feet bsg utilizing a B-95 high torque, truck-mounted drill rig <br /> equipped with 8-inch and 12-inch diameter hollow-stem augers All soil cuttings generated from <br />' drilling activities were stockpiled in and covered in a 20 yard soil bin located in the southwest <br /> section of the site,monitoring well locations are depicted in Figure 2 Ground water monitoring well <br />' Advanced GeoEnvi ron mental.Inc <br /> 1 <br />