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1 <br /> 1 Quarterly Report - Third Quarter 2004 <br /> • THREE B'S TRUCK PLAZA <br />' 14749 Thornton Road, Lodi, California <br />' 1.0. INTRODUCTION AND SCOPE OF WORK <br /> Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for 14749 Thornton <br />' Road (the site), Lodi, California The site setting is illustrated on Figure 1 Site structures and <br /> monitoring well locations are depicted on Figure 2 <br />' The obi ective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground <br /> water and to characterize ground water flow direction and gradient on the site This report has been <br />' prepared in accordance with guidelines issued by the California Regional Water Quality Control <br /> Board - Central Valley Region (CRWQCB) for investigation of underground storage tank (UST) <br /> sites Ground water monitoring data acquired to date is included in the tables of this report <br />' Previous soil characteristics data obtained by a CPT investigation enabled AGE to define six <br /> informal hydrogeologic units(CPTSite Investigation-Fourth Quarter 2001,dated 15 March 2002) <br />' The informal hydrogeologic units were defined as Hydrologic Unit 1 (10-35 feet bsg), Hydrologic <br /> Unit 2 (35-60 feet bsg), Hydrologic Unit 3 (60-90 feet bsg), Hydrologic Unit 4 (90-110 feet bsg), <br /> Hydrologic Unit 5 (110 to 130 feet) and Hydrologic Unit 6 (130 to at least 150 feet bsg) <br /> • The following is a brief summary of third quarter 2004 groundwater monitoring activities performed <br /> at the site <br /> G 13 September 2004 - Depth to water measurements were collected at wells MW-1 through <br /> MW-12, <br /> • 14 September 2004 - Ground water monitoring was performed at wells MW-1 through <br /> MW-6, MW-7 (A-E), MW-11 (A-F) and DW-1, <br />' • 15 September 2004- Ground water monitoring was performed at wells MW-8 (A-F),MW-9 <br /> (A-E), MW-10 (A-F) and MW-12 (A-F) <br /> 2.0. MONITORING AND SAMPLING PROCEDURES <br /> On 13-15 September 2004, ground water monitoring was performed at the site at ground water <br /> monitoring wells MW-1 through MW-12 and domestic water well DW-1, monitoring well <br /> construction details are summarized in Table 1 Ground water monitoring procedures were outlined <br /> in the Work Plan Addendum-October 1998, dated 14 October 1998,prepared by AGE and approved <br /> by the San Joaquin County Environmental Health Department (SJCEHD) by letter dated 21 <br /> December 1998 <br /> • <br /> IAdvanced GeoEnvironmental,Inc <br />