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I ' Quarterly Report - First Quarter 2002 WATERLOO FOOD & FUEL ' 3032 E. 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 quarterly report for the site located at 3032 E Waterloo Road, Stockton, California(site) The scope of work included conducting a quarterly ground water monitoring event and preparation of this ' report The location of the site is illustrated in Figure 1, locations of structures, soil borings and monitoring wells on the site are depicted in Figure 2 I At the present time, there are eight monitoring well locations at the site, four locations contain single-level wells (MW-1 through MW-4), and four (MW-5 through MW-8) contain multi-level wells consisting of six perforated and screened well chambers in a seven-chamber casing (Continuous Multichannel Tubing) Based on field and laboratory analytical data,screened intervals of the wells were set within discrete depth intervals(hydrologic units)to monitor vertical and lateral changes in hydraulic gradient, contaminant concentrations and migration directions within the hydraulic 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 As-built monitoring well construction details are ' summarized in Appendix A and the hydrologic units are depicted on Figure 2A I Six hydrologic units (HUs) were defined 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-8A, HU2 (62 to 70 feet bsg), within the screened interval of wells MW-1 through MW-4 and A-wells MW-5A through MW-8A,HU3 (70 to 90 feet bsg),within the screened interval of B-wells MW-5B through MW-8B,HU4(90 to 100 feet bsg),within the screened interval of B-wells MW-5B through MW-8B, HUS (100 to 155 feet bsg),within the screened interval of C- and D-wells MW-5C and I MW-5D through MW-8C and MW-8D, and HU6 (175 to 185 feet bsg),withm the screened Interval of E-wells MW-5E through MW-8E HU6 was designated as the deepest hydrologic unit monitored I Additional site history and findings from previous investigations and monitoring events at the site are detailed in AGE's report titled Preliminary Investigation and Evaluation Report, dated 14 December 2000 and Cone Penetrometer Testing and Monitoring Well Installation Report dated 11 February 2002 2.0. PROCEDURES This report was prepared in accordance with guidelines established by the California Regional Water IQuality Control Board (CRWQCB) - Central Valley Division for subsurface investigation of • underground storage tank (UST) sites Tasks and procedures for this investigation were completed in accordance with the EHD-approved Preliminary Site Assessment Work Plan, dated 12 October Advanced GeolEnvironmental,Inc