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I ' Quarterly Ground Water Monitoring Report - Third Quarter 2004 • WATERLOO FOOD & FUEL 3032 East Waterloo Road, Stockton, California ' 1.0. INTRODUCTION AND SCOPE OF WORK At the request of Mr Paul Sidhu,Advanced GeoEnvironmental,Inc (AGE)has prepared this report ' for the site located at 3032 East Waterloo Road, Stockton, California (site) The scope of work included conducting a quarterly ground water monitoring event during the third quarter of 2004 and preparation of this report The location of the site is illustrated on Figure 1, locations of structures, ' soil borings and monitoring wells on the site are depicted on Figure 2 ' At the present time, there are a total of seven monitoring well locations at the site, four locations contain single-level wells (MW-1 through MW-4), and three locations (MW-5 through MW-7) contain multi-level wells consisting of five perforated and screened well chambers (A through E) ' in a seven-chamber casing (Continuous Multichannel Tubing-CMT) An eighth monitoring well (MW-8) was destroyed due to redevelopment of the adjacent property to the east ' Based on field and laboratory analytical data, well screens were set within discrete depth intervals (hydrologic units) to monitor vertical and lateral changes in hydraulic gradient, contaminant concentrations and migration directions within the hydrologic units Each hydrologic unit was � . defined based on lithologic information provided by cone penetrometer testing, as detailed in the AGE-prepared Cone Penetrometer Testing and Monitoring Well Installation Report, dated 11 February 2002 A historical background is summarized in Appendix A ' Six hydrologic units (HUs) were defined as follows ' HU1 (water table to 62 feet below surface grade [bsg]),within the screened interval of wells MW-1 through MW-4 and A-wells MW-5A through MW-7A, ' HU2 (62 to 70 feet bsg),within the screened interval of wells MW-1 through MW-4 and A- wells MW-5A through MW-7A, Water is currently below most of these wells HU3 (70 to 90 feet bsg), within the screened interval of B-wells MW-5B through MW-7B, ' HU4 (90 to 100 feet bsg),within the screened interval of B-wells MW-5B through MW-7B, • HU5 (100 to 155 feet bsg),within the screened interval of C-and D-wells MW-5C and MW- 5D through MW-7C and MW-7D, and • HU6 (175 tol 85 feet bsg),withm the screened interval ofE-wells MW-5E through MW-7E ' HU6 was designated as the deepest hydrologic unit monitored Interim ground water remediation by ground water extraction was initiated at the site on 20 May 2003,in accordance with procedures outlined in the AGE-prepared Interim Remediation and • Site Assessment Work Plan, dated 25 January 2001 A report on the quarterly monitoring and assessment of ground water extraction will be provided in a separate, remediation progress report Advanced GeoEnvironinental,Inc