ARCHIVED REPORTS_2011 REVISED FEASABILITY STUDY

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Nestle USA, Inc.—Ripon, CA January 28, 2011 2011 Revised Feasibility Study WWTP refers to the City of Ripon Waste Water Treatment Plant located in the southern portion of the Study Area. The WWTP consists of a series of storage and percolation lagoons used to treat industrial and residential wastewater discharged from businesses and residences within the City of Ripon. Off-Site refers the areas outside of the facility at 230 Industrial Avenue, but within the bounds of the Study Area. 3 Background and Summary of Site Remediation Activities The following subsections summarize the following topics: • Site History, • Discovery of Initial Release, • Regulatory Oversight, and • Remedial Actions Taken To Date. 3.1 Site History The Site is located at 230 Industrial Avenue in Ripon, California, seven miles north of Modesto and along California Route 99 (Figure 1). Originally built in the 1930s for dairy production, the facility was used to manufacture soluble instant coffee beginning in 1948. The Site was closed in 1994, and the main buildings were demolished in 1995. California Freight Sales (CalFreight) purchased significant portions of the property in 2005. As part of the sale of the property to CalFreight, Nestle retained responsibility for Site cleanup. Nestle also retained ownership of two properties in Ripon, one located at the northeasterly corner of the former Industrial Avenue Site, and one at 519 South Stockton Avenue. Both properties exist within industrial zones in the southeast portion of the City of Ripon. Other industrial properties lie to the west and south of the Site. According to the City of Ripon master plan, the area will remain zoned as industrial until the year 2040" From the 1950s until 1970, activities at the Site included decaffeinating coffee using a closed-loop extraction process that used TCE as a solvent to extract caffeine from green coffee beans. Aboveground tanks located immediately south of the decaffeination building were used to store the TCE. The process included gravity separation and distillation of the solvent in a closed-loop system with TCE returning to a solution tank for reuse. The effluent from the separator flowed into an industrial sewer line located between the decaffeination building and the warehouse. The industrial sewer line drained to the sewer main along Industrial Avenue which was owned and operated by the City of Ripon. The sewer main collected effluent from numerous residences and businesses before discharging effluent to the City of Ripon's eastern wastewater lagoons within the WWTP (Figure 3). In 1970, methylene chloride replaced TCE in the decaffeination 3