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MW 1 upper water-bearin msl) Surround' g Zone approximate) LFR Inc. ounding the gravel Y 100 feet below the feet below the bottom de prt. The g natural Pth of the roundwater table is located a grade (165 feet ' zone u primarily from local irrigation and avel ee Recharge of the Upper water 35 m. Local al irri be toward groundwater flog k as calculated d frof surface Fater-bearing the northwest at a shallow water throe gradient of 0.00m , m on-site monitorin through the The Site is a closed basin with no 001 foot per foot g well data to significant surface (ft/ft)• Carbon Irrigation District C sources Paths for surface-water outfall and ' Creek, (e.g streams, Ponds) located at there are no an intermittent streamanal b°ands the gravel the Site. The bodies in the vicini • is located 500 pit to the east, Banta 0.5 mile to the ty of the Site are the feet to the south, Otherendota Canal and Corral HOIIow ' southwest). thwest) and the California Aq educt ( a (located 1 located approximately sou loc mile to the I 3.0 SUMMARY OF MONITORING AND SAMPLING ACTIVITIES The following section summarizes the groundwater conducted and chemical analyses requested. monitoring and sampling activities d 3.1 Scope of Work Two groundwater sampling events were conducted by LFR staff on June 2006. During groundwater monitori1 and 23, depth ng and sampling activities, ste LFR staff measured the to groundwater from the seven imonitoring wells (MW-1 through MW-5, MW-7, and MW-8) and collected groundwater samples from four monitoring wells WWA, MW-5, MW-7, and MW-8). The four groundwater samples (plus one duplicate sample per event) were submitted to a state-certified laboratory for chemical analysis. LFR staff then evaluated the monitoring and sampling results. 3.2 Groundwater Monitoring Activities Depth to groundwater was measured using an electronic water-level meter before the wells were purgecfor sampling. Groundwater elevations were calculated by subtracting the deth to water from the surveyed monitoring well elevation (top-of- casing) measurenints. Groundwater elevations are summarized in Table 1 and groundwater ele%:ion contours are shown on Figure 3 for the most recent event on June 23, 2006. Each well was Aged before sampling began by removing at least 3 well casing volumes of wateiThe specific conductance, pH, oxidation reduction potential, dissolved oxygeland temperature of the extracted water were measured and observed during well putlg. The water-quality parameters and gallons purged were recorded on water-qualitempling data sheets (Appendix A). Rpt June 2oo6Aoc Page 3 Final_r\V Mon Rp