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Nestle USA, Inc., Ripon, California August 11, 2009 <br /> Second Quarter 2009 Site Status Report <br /> oo Pumping from the municipal production wells influenced the groundwater <br /> elevation of nearby wells (Figures 3, 4, and 5). Labels on the maps identify <br /> the water bearing units in which the production wells are screened. The <br /> groundwater elevation data from wells screened in multiple aquifers (MW-5, <br /> MW-7, and MW-10) are included on the groundwater elevation figures <br /> (Figures 3, 4, and 5) to show the effects of these active wells. <br /> oo The groundwater mound in the Upper Aquifer appears to be present beneath <br /> the western portion of the Neenah Paper Company lagoons near TH-2 and <br /> beneath the vacant land to the west of Neenah Paper Company property. <br /> The location of the center of the mound is east of its location in the First <br /> Quarter 2009, but is consistent with its location in the Second Quarter 2008. <br /> This suggests that not only the presence of the groundwater mound but the <br /> location of the center of the mound is influenced by water and wastewater <br /> management practices and the recharge in this area. <br /> 0o The groundwater surface mound in the Upper Aquifer extends from TH-2 to <br /> the northwest, in the region of the City of Ripon Wastewater Lagoons located <br /> east of M-23A, creating southward flow in the immediate area of the lagoons. <br /> The City of Ripon recharges the Upper Aquifer with water pumped from the <br /> South San Joaquin Irrigation District (SSJID) into a recharge pond on Doak <br /> Boulevard, north of the City of Ripon wastewater treatment lagoons. The City <br /> of Ripon's recharge pond is located in close proximity to wells M-23A and M- <br /> 42A. Wastewater inflow is directly infiltrated to the water table through rapid <br /> infiltration at disposal ponds and infiltration basins at flow rates of <br /> approximately 80,000 gallons per day. As indicated above, the presence of a <br /> groundwater mound near the lagoon area is explained by water and <br /> wastewater management practices and the recharge in this area. <br /> oo In the Intermediate Aquifer, a groundwater mound appears to be present <br /> north of the City of Ripon Wastewater Lagoons near M-20C1. This influence <br /> appears to be creating southeasterly and southwesterly flow immediately <br /> south of the City of Ripon Wastewater Lagoons. <br /> oo On average, groundwater elevation increased by 0.13 feet in the Upper <br /> Aquifer from January 12, 2009 to April 6, 2009 (excluding Nestle groundwater <br /> extraction wells). The increase in average groundwater elevations in the <br /> Upper Aquifer between the first and second quarters of 2009 is consistent <br /> with the increase between the first and second quarters of 2008 suggesting <br /> that the groundwater elevations are responding to seasonal variations in <br /> recharge. <br /> oo Average groundwater elevations decreased by 0.16 feet for Intermediate <br /> Aquifer from January 12, 2009 to April 6, 2009 (excluding Nestle groundwater <br /> extraction wells). The average groundwater elevations in the Intermediate <br /> Aquifer had increased between the first and second quarters of 2008. The <br /> decrease in average groundwater elevations in the Intermediate Aquifer may <br /> be due to additional pumping by the City of Ripon. <br /> oo The groundwater elevation in the Lower Aquifer decreased an average of <br /> 2.34 feet from January 12, 2009 to April 6, 2009. The decrease in the <br /> average groundwater elevation in the Second Quarter 2009 is consistent with <br /> a decrease in the average groundwater elevation in the Lower Aquifer in the <br /> 7 <br />