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Nestle USA, Inc., Ripon, California March 31, 2011 <br /> 2010 Annual Report <br /> • Influent TCE and cis-1,2-DCE concentrations at the 7501 Kiernan Avenue wellhead <br /> treatment system ranged from 0.49 pg/L to 0.71 pg/L and 1.4 pg/L to 2.1 pg/L, <br /> respectively, remaining stable in 2010. No VC concentrations above the laboratory <br /> reporting limit were detected in samples from the 7501 Kiernan Avenue replacement <br /> well. <br /> 7501 Kiernan Avenue Concentration Trends in 2010 <br /> 2.50 <br /> �a 2.00 <br /> Q <br /> J <br /> 1.50 <br /> c <br /> 0 <br /> co <br /> 1.00 <br /> a� <br /> U <br /> 0 n s <br /> U 0.50 o A e <br /> 0.00 0 0 0 0 0 0 0 0 0 0 0 0 <br /> Dec-09 Jan-10 Mar-10 May-10 Jun-10 Aug-10 Sep-10 Nov-10 Jan-11 <br /> 7_ATCE G CIS 0 VC TCE Trendline —cis-1,2-DCE Trendline <br /> • TCE, 1,2-DCE (both cis- and trans-), and VC in influent samples collected at 5725 Hall <br /> Road have been below reporting limits since the replacement well began operating in <br /> April 2010, with the exception of one detection of vinyl chloride at a concentration of 0.29 <br /> pg/L on May 11, 2010. Subsequent sample results have confirmed that this was an <br /> anomalous detection possibly due to a sampling error. The new well remains connected <br /> to the treatment system. <br /> 5 CONCLUSIONS <br /> The monitoring and remediation information provided above support the conclusions appearing <br /> below. These conclusions fall into the following categories: <br /> • Groundwater Investigation; <br /> • Groundwater Monitoring <br /> • Groundwater Extraction and Treatment; and <br /> • Migration Control. <br /> 26 <br />