ARCHIVED REPORTS_2013 ANNUAL REPORT

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Nestle USA, Inc., Ripon, California March 26, 2014 2013 Annual Report 1 INTRODUCTION On behalf of Nestle USA, Inc. (Nestle), Environmental Cost Management, Inc. (ECM) prepared this 2013 Annual Report to summarize the results of groundwater monitoring and remedial activities related to the former Nestle facility, located at 230 Industrial Avenue (the "Site") in Ripon, California (Figure 1). The term "Study Area" refers to a wider area of investigation in the larger Ripon vicinity (Figure 2). For a summary of the facility history, hydrogeology of the Study Area, release information, historical investigations, and remedial actions undertaken, refer to Appendix A. Nestle implemented a groundwater monitoring program in early 1987 to monitor concentrations of selected volatile organic compounds (VOCs), primarily trichloroethene (TCE), and its associated daughter products, cis-1,2-dichloroethene (cis-1,2-DCE) and vinyl chloride (VC) ("constituents of concern," or COCs hereafter). ECM conducted the 2013 monitoring, sampling, and reporting activities in accordance with the following directives: • Cleanup and Abatement Order No. R5-2006-0720 (CAO), issued on July 24, 2006, by the California Regional Water Quality Control Board-Central Valley Region (RWQCB); and • Monitoring and Reporting Program (MRP) No. R5-2010-08101 . The purpose of the 2013 Annual Report is to: 1. Summarize and evaluate information obtained from the groundwater monitoring and other key activities in 2013; 2. Provide an update on the status of ongoing remediation activities; 3. Provide an overview of additional key activities performed in 2013; 4. Present conclusions and recommendations based on observations and findings of various activities in 2013; and 5. Provide information regarding future monitoring and remediation activity. 2 GROUNDWATER MONITORING The groundwater monitoring program includes gauging groundwater elevations and collecting and analyzing water samples for CDCs in accordance with the MRP. Monitoring wells installed after November 2009 are not listed in the current MRP, but are sampled on a quarterly basis. The following sections summarize the field and laboratory results for data collected during 2013, and present evaluations and trends developed from groundwater elevation and COC data. 2.1 WELL NETWORK FOR GROUNDWATER MONITORING Table 1 summarizes information (well owner, well type, aquifer, and sampling frequency) for wells currently included in the monitoring program (Figure 2). As shown on the table, the monitoring well network includes: • Wells installed by Nestle for monitoring and groundwater remediation (extraction wells); 1