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Quarterly Report - Second Quarter 2004 • K& S GAS & GROCERY ' 701 East Charter Way, Stockton, California ' 1.0. INTRODUCTION At the request of Mr Khaldoon Othman,Advanced GeoEnvironmental,Inc (AGE)has prepared this ' quarterly report for the property located at 701 East Charter Way, Stockton, California The scope of work included the performance of a quarterly ground water monitoring event and preparation of this report The site and the surrounding area are illustrated in Figure 1 On-site structures and ' monitoring well locations are illustrated on Figure 2 Additional site background information is summarized in Appendix A ' At the present time,there are six monitoring well locations at the site, four locations contain single- level wells (MW-1 through MW-3 and MW-7), and two contain multi-level wells [MW-8(A-D) through MW-9(A-D)]consisting of four perforated and screened well chambers in a seven-chamber ' casing [Continuous Multichannel Tubing (CMT)] Based on field and laboratory analytical data, screened intervals of the wells were set within discrete depth intervals to monitor vertical and lateral ' changes in hydraulic gradient, contaminant concentrations, and migration directions within the hydraulic units Each hydrostratigraphic or hydrogeologic unit was defined based on lithologic information provided by cone penetrometer testing(CPT) and soil boring advancement, as detailed lie in the AGE-prepared Quarterly Report - First Quarter 2004, dated 12 January 2005 Seven hydrogeologic units (HUs) were defined HU1 (water table to 70 feet below surface grade ' [bsg]), within the screened interval of wells MW-1 through MW-3, MW-7, MW-8A and MW-9A, HU2 (70 feet to 85 feet bsg) within the screened interval of wells MW-8B and MW-9B, and HU3 (85 feet to between 95 and 100 feet bsg), which is not screened, HU4 (95 and 100 feet to ' approximately 120 feet bsg),within the screened interval of wells,MW-8C,and MW-9C,HU5 (120 to approximately 135 feet bsg),which is not screened, HU6 (135 feet to 150 feet bsg),within the screened interval of wells MW-8D and MW-91), and HU7 (150 feet bsg),which were is screened ' HU6 is currently the deepest hydraulic unit monitored i2.0. PROCEDURES The quarterly ground water monitoring event was performed on 29 June 2004, ground water monitoring was performed on monitoring wells MW-1 through MW-3 and MW-7 through MW-9 Field work was performed in accordance with guidelines issued by the California Regional Water Quality Control Board (RWQCB) for the investigation of underground storage tank (UST) sites 1 ' Advanced GeoEnvironmental,Inc