ARCHIVED REPORTS_2011 REVISED FEASABILITY STUDY

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Nestle USA, Inc.—Ripon, CA January 28, 2011 2011 Revised Feasibility Study presented in support of the pump-and-treat recommendation. The modeling has been updated since the 1994 version" • The 1998 addendum developed additional groundwater cleanup alternatives, including the use of potassium permanganate to treat the TCE in-situ. A potassium permanganate pilot study was performed in 1999-2000. The pilot study demonstrated that the process reduced TCE and cis-1,2-dichloroethene (cis-1,2-DCE) within a 20-foot radius of the injection points for a period of time. However, due to limited delivery and concentration rebound, the pilot study results indicated other processes would be needed to effectively remediate the Site. The CAO specifies: "any additional addendums or revisions to the 1994 Feasibility Study Report that are needed to support the selected remedies in the Draft RAP must be submitted and approved by Board staff at least 30 days" before the draft RAP due date. An approved FS is critical to the preparation of an appropriate RAP because the RAP will present the details of technology process options for remedial alternatives recommended in the 2011 Revised FS. ECM submitted a Revised FS to the RWQCB on behalf of Nestle on January 30, 2009. The October 2009 Revised FS updates the January 2009 report and addresses RWQCB comments received in May 2009. This 2011 Revised FS Report reflects updates based on RWQCB comments via a letter dated October 19, 2010 on the October 2009 Revised FS"' 2 Definitions and Terminology This section provides definitions and terminology used throughout this FS document. Remedial Action Objectives are the targeted goals that clean-up actions are intended to meet, e.g. source removal. General Response Actions refers to general actions that meet remedial objectives, e.g. In-situ Treatment. Technologies refer to specific response actions that can be applied to the project, e.g. In-situ Chemical Treatment. Process refers to specific technologies that can be applied to the project, e.g. Potassium Permanganate injection. Alternatives refer to remedial approaches developed through assembling feasible technologies and processes to address chemical of concern (COC) impacts across the entire Study Area. Study Area refers to an area approximately four square miles, as shown in Figure 2. Site refers the property on which Nestle once operated a facility at 230 Industrial Avenue. Nestle closed the facility in approximately 1994. 2