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1 <br /> Well Installation and Quarterly Groundwater Monitoring Report <br /> Second Quarter 2008 <br /> 1950 West Fremont Street,Stockton, California <br /> Based on slug test analysis of the three wells, it appears that the aquifer is heterogeneous. Hydraulic <br /> conductivity values ranged from 0.056 feet per day (ft/d) at well MW-1 to 1.65 ft/d at well MW-2. <br /> ' Hydraulic conductivities estimated from slug test analyses are summarized in Table 2. The fitted curves <br /> are presented in Appendix G. <br /> ' 3.4 GROUNDWATER VELOCITY <br /> ' Groundwater elevations from the newly installed wells were used to estimate horizontal shallow <br /> groundwater velocity beneath the site. Groundwater elevations for the three wells used to determine <br /> vertical flow are shown on Figure 4. Hydraulic conductivity estimates are provided in Table 2 and <br /> Appendix G. <br /> ' Groundwater velocity is obtained by the equation V=Ki/n, where K = hydraulic conductivity, i = <br /> groundwater gradient, and n = porosity. Groundwater velocity at the site ranged from 0.00112 feet per <br /> ' day (ft/d) at well MW-1 to 0.0328 ft/d at well MW-2, based on hydraulic conductivity values ranging <br /> from 0.056 ft/d (MW-1) to 1.65 ft/d (MW-2), a groundwater gradient of 0.004, and a porosity of 0.2 <br /> ' (20%). <br /> 1 3.5 GROUNDWATER ANALYTICAL RESULTS <br /> Groundwater samples were collected from three newly installed wells. The collected groundwater <br /> ' samples were analyzed for VOCs, SVOCs, dissolved CAM 17 metals and MDMA. Groundwater <br /> analytical results are tabulated in Table 3. Laboratory methods are listed in Section 2.8. Historical <br /> ' sampling results and the results from the June 2008 groundwater sampling event and are presented on <br /> Figures 3 and 5, respectively. Data qualifications and the findings of data validation are presented in <br /> ' Section 2.8. <br /> 3.5.1 MTBE and Additional Volatile Organic Compounds <br /> VOCs, including MTBE, were not detected above respective laboratory reporting limits (RLs) in the <br /> samples collected from the site during the June 2008 investigation. <br /> Project 102790 10 July 2008 <br />