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Semi-Annual Groundwater Monitoring Report - Fourth Quarter 2012 <br />WATERLOO FOOD & FUEL <br />3032 East Waterloo Road, Stockton, California <br />1.0. INTRODUCTION AND SCOPE OF WORK <br />At the request of Waterloo Food and Fuel, Advanced GeoEnvironmental, Inc. (AGE) <br />prepared this report for the property located at 3032 East Waterloo Road, Stockton, <br />California (site). The scope of work included performance of a groundwater monitoring <br />event in December 2012 and preparation of this report. The site and surrounding area are <br />illustrated in Figure 1. On-site and off-site structures and monitoring well locations are <br />illustrated in Figure 2. Historical site background information is summarized in Appendix A. <br />Active groundwater (extraction) remediation for the site are separately reported in a <br />cumulative report. At the present time, there are a total of 11 monitoring well locations at <br />the site; eight locations contain single-level wells (MW-1 through MW-4, MW-9 through <br />MW-12) and three locations (MW-5 through MW-7) contain multi-level wells consisting of <br />five perforated and screened well chambers (A through E) in a seven-chamber casing <br />(Continuous Multichannel Tubing-CMT). <br />Based on field and laboratory analytical data, well screens were set within discrete depth <br />intervals (hydrogeologic units) to monitor vertical and lateral changes in hydraulic gradient, <br />contaminant concentrations and migration directions within hydrogeologic units. Each <br />hydrogeologic unit was defined based on lithologic information provided by cone <br />penetrometer testing, as detailed in the AGE-prepared Cone Penetrometer Testing and <br />Monitoring Well Installation Report, dated 11 February 2002. <br />Six informal functional hydrogeologic units (HUs) were defined as follows: <br />HU1 (water table to 65 feet below surface grade [bsg]), within the screened interval <br />of wells MW-1 through MW-4, A-wells MW-5A through MW-7A and MW-12; <br />HU2 (65 to 70 feet bsg), within the screened interval of wells MW-1 through MW-4, <br />A-wells MW-5A through MW-7A, and MW-12; <br />HU3 (70 to 90 feet bsg), above the screened interval of B-wells MW-5B through <br />MW-7B; <br />HU4 (90 to100 feet bsg), within the screened interval of B-wells MW-5B through <br />MW-7B, and MW-11; <br />HU5 (100 to 155 feet bsg),within the screened interval of C- and D-wells MW-5C <br />and MW-5D through MW-7C and MW-7D and MW-10; and <br />HU6 (175 to185 feet bsg),within the screened interval of E-wells MW-5E through <br />MW-7E and MW-9. HU6 is designated as the deepest hydrogeologic unit monitored. <br />Advanced GeoEnvironmental, Inc.