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i <br /> IRemediation Update Report - Third and Fourth Quarters 2004 <br /> PACIFIC MINI-MART <br /> 4511 Pacific Avenue, Stockton, California <br /> 1.0. INTRODUCTION <br /> At the request of Mr Art Wyatt, Advanced GeoEnvironmental, Inc (AGE) has prepared this <br /> Remediation Update Report for 4511 Pacific Avenue, Stockton, California (the site) This report <br /> documents the operation of a low-flow ground water remediation system, the procedures for <br /> collection and analysis of ground water treatment samples and the results of ground water and <br /> Itreatment system monitoring events The location of the site is illustrated on Figure 1 Structures, <br /> monitoring well and soil boring locations are illustrated on Figure 2 The site history and a <br /> description of previous work performed at the site are detailed in Appendix A Data from previous <br /> ground water treatment monitoring events are included in the tables of this report <br />' 2.0. PROCEDURES <br /> The field procedures were performed in accordance with procedures outlined in Remedial Action <br /> Work Plan,prepared by AGE, dated 22 December 2003, and approved by the San Joaquin County <br /> Environmental Health Department(EHD)by letter,dated 23 December 2003 During the mid-second <br /> • quarter and later-portion of the fourth quarter 2004,the ground water extraction remediation system <br /> was monitored and maintained at the site Additionally the field work included preparation for soil <br /> vapor extraction (SVE) and expansion of the ground water extraction capabilities <br /> 2 1 INTERIM REMEDIATION <br /> Between 14 May and 14 December 2004, the interim ground water pump-and-treat remediation <br /> system was in continuous operation at the site <br /> 2 1 1 Ground Water Extraction System Operation <br /> Extraction well EW-1 was adjusted at the well-head to continuously extract round water during the <br /> J Y g <br /> mid-second quarter and later-portion of the fourth quarter 2004 at an average flow rate of less than <br /> 2 gallons per minute(GPM),until the utilization of extraction well EW-2,which produced additional <br /> ground water <br /> The extracted ground water was routed through a ground water treatment system consisting of <br /> granular activated carbon (GAC) and Sunsolve® Following treatment, water was discharged <br /> underground via 1-inch diameter, schedule 80 polyvinylchloride(PVC)pipe along the west side of <br /> the site to the City of Stockton discharge line located in Rose Marie Lane <br /> Advanced GeoEnvsronmental,Inc <br /> I <br />