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MONITORING WELL #2 MIDDLE <br /> Purge Volume Temperature pH Elect. Cond. - EC <br /> Initial - 0 gallons 57.3 7.4 7260 <br /> 4 gallons 60.6 7.1 7170 <br /> 8 gallons 61.9 6.7 7140 <br /> 12 gallons 62.2 6.7 7120 <br /> 16 gallons 62.2 6.7 7120 <br /> MONITORING WELL #3 SOUTH <br /> Purge Volume Temperature pH Elect. Cond. - EC <br /> Initial - 0 gallons 61.5 7.2 3400 <br /> 4 gallons 63.4 7.0 4650 <br /> 8 gallons 63.2 6.7 4610 <br /> 12 gallons 63.3 6.7 4600 <br /> 16 gallons 63.3 6.7 4600 <br /> _ The groundwater analytical test results illustrate a surprisingly low concentration of nitrate and <br /> Total Kjeldahl Nitrogen (TKN) within the top aquifer at the north and south ends of the facility <br /> (MW#1 North and MW#3 South). The domestic well also has a low concentration of nitrate at <br /> 9 ppm. Monitoring well MW#2 Middle is located adjacent to the separation basin and shows <br /> higher levels of nitrate at 33 ppm and TKN at 10.9 ppm. Total Dissolved Solids (TDS) <br /> concentrations in the monitoring wells indicate impact from salts, although the soluble salt <br /> concentration of the application fields contain low-to-medium salt content. The groundwater salt <br /> concentration may be attributed to the well-known fact that Tracy area groundwater has a <br /> indigenously high salt content. <br /> The groundwater directional flow could not be accurately determined by the triangulation method <br /> because of the location of MW#2. This monitoring well is being influenced by the water in the <br /> separation basin, causing an increase in static water level elevation from the hydraulic head. An <br /> estimation of the groundwater directional flow is toward the south. From this estimation, it <br /> appears that the dairy facility is not contributing appreciable amounts of nitrate to the underlying <br /> — zone of saturation, or first water table. It is our opinion that significant denitrification must be <br /> occurring in the vadose zone as well as the zone of saturation. <br /> The groundwater gradient is calculated at: 3.85 - 1.55 = 2.3 ft difference in groundwater elevation <br /> between MW#1 and MW#3, over 1100 ft=0.0021 ft/ft. <br /> 4 <br /> Vaffey Ag Prjearch <br />