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system in 2004. Combined extracted water from E-2 and E-6 was discharged to the City of <br /> Ripon non-potable water system. <br /> The performance and VOC removal rates of the Stockton Avenue extraction and treatment <br /> system have declined since 200733, suggesting that source mass has been remediated. Nestle <br /> installed three groundwater monitoring wells in the vicinity of the Stockton Avenue extraction <br /> and treatment system in December 2009 to: <br /> • monitor post-remedial groundwater conditions, <br /> • confirm the lack of significant VOC concentrations beneath the Stockton Avenue area, <br /> and <br /> • confirm that VOCs detected in this area are predominately related to migration from the <br /> City of Ripon sewage treatment ponds near the Stanislaus River. <br /> Groundwater samples collected from the three new monitoring wells (M-5213, M-5313, and M- <br /> 54C) have shown that: <br /> • the Stockton Avenue extraction and treatment system has successfully remediated the <br /> target area surrounding this location, and <br /> • there is no Intermediate Aquifer source of COCs beneath the area of 519 South <br /> Stockton Avenue 34 (supporting the findings of the Site Conceptual Model") <br /> Nestle requested permission to shut down the Stockton Avenue groundwater extraction and <br /> treatment system in July 201 035. The RWQCB concurred 36 and ECM ceased system operation <br /> on October 1, 2010. <br /> Appendix A <br /> Page A5 of A7 <br />