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i ' Quarterly Report - First Quarter 2005 • TOP FILLING STATION ' 101 South Wilson Way, Stockton, California ' 1.0. INTRODUCTION AND SCOPE OF WORK Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for 101 South Wilson ' Way(the site),Stockton,California The report documents first quarter 2005 procedures and results for a ground water monitoring event,progress of an interim remediation soil vapor extraction(SVE) recovery system and progress of an interim remediation ground water pump-and-treat(P&T)system The objectives of the site activities were to monitor dissolved petroleum hydrocarbon concentrations in ground water,to assess ground water flow direction and gradient,and to monitor the progress and ' effectiveness of SVE and P&T remediation at the site The site setting is illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 This report has been prepared in accordance with guidelines issued by the California Regional Water Quality Control Board(RWQCB)-Central Valley Region for investigation of underground storage tank (UST) sites A summary of previous investigations at the site is included in Appendix A Ground water monitoring data acquired to date is included in the tables of this report Previous soil characteristics data obtained by a CPT investigation enabled AGE to define four ' • informal hydrogeologic units (Quarterly Report- Second Quarter 2000, dated 31 July 2000) The informal hydrogeologic units were defined as Hydrologic Unit 1 (30 to 55 feet bsg), Hydrologic Unit 2(55 to 65 feet bsg),Hydrologic Unit 3 (65 to 85 feet bsg)and Hydrologic Unit 4 (85 to at least ' 100 feet bsg) The following is a brief summary of ground water monitoring,SVE and P&T remediation activities performed at the site during the first quarter 2005 • Between 29 December 2004 and 08 March 2005 - Continued P&T interim ground water remediation utilizing on-site wells EW-1 and EW-2, discharged approximately 81,280 gallons of treated ground water into the City of Stockton sanitary sewer system • Between 22 December and 08 March 2005 -Continued SVE interim remediation selectively utilizing SVE wells VW-1 (A-B), VW-2A and VW-3A, extracted a total of approximately 3,210 pounds of petroleum hydrocarbons from the subsurface • 20 January 2005 - Monthly monitoring event performed on P&T and SVE remediation systems • 21 February 2005 - Monthly monitoring event performed on P&T and SVE remediation systems • 04 March 2005-Quarterly groundwater monitoring event performed at wells MW-1 through MW-3, MW-5 through MW-8, VW-1C, VW-2A and VW-3A Advanced GeoEnvironmental,Inc I