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. Quarterly Report - Fourth 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 fourth quarter of 2004, monthly monitoring and assessment of ground water extraction and remediation progress during the third and fourth quarter 2004 and preparation of this report The location of the site is illustrated on Figure 1, locations of structures, soil borings and momtonng wells at 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 monitonng 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 site 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 ofB-wells MW-5B through MW-7B, • HU5 (100 to 155 feet bsg),wrthln the screened interval of C- and D-wells MW-5C and MW-51) through MW-7C and MW-713, and • HU6(175 to185 feet bsg),within the screened interval of E-wells MW-5E through MW-7E HU6 is designated as the deepest hydrologic unit monitored Advanced UeoL'nvironmental,Inc