ARCHIVED REPORTS_SITE CONCEPTUAL MODEL 2009

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amec— by the early 1990's due to low rainfall, and have since been rising due to increased precipitation, recharge from excess irrigation water and recharge from the Stanislaus River during high stage. 3.0 FORMER NESTLE FACILITY AT 230 INDUSTRIAL AVENUE This section of the SCM report summarizes potential historical onsite COC release areas and explains recent distribution of COCs in groundwater characterized during field work by Geomatrix (2006) on behalf of Nestle. The Site covers approximately 14 acres of relatively flat land surfaces with dirt and asphalt. The Site spans from Industrial Avenue towards the Union Pacific Railroad to the east, 4th Street on the south, and Beverly Place on the east (Figure 2). Nestle's predecessor companies owned the land since the 1930's until 2005, when CalFreight purchased most of the property. Nestle retained ownership of the northernmost triangular portion of the Site comprising approximately 1 acre of predominantly dirt-covered land where a groundwater treatment system and old facility water tower exist. The surrounding area is occupied by industrial operations including Ripon Milling (agricultural products) and a building stone company to the west, Guntert Steel and Nulaid Foods to the south. A railroad spur crosses the middle of the Site and extends westward across Industrial Avenue towards Stockton Avenue. Neenah Paper Company (formerly Fox River Paper Company LLC, and Simpson Paper Company) have operated since the mid-1960's south of the site along the north bank of the Stanislaus River. 3.1 SITE HISTORY This Site history provided here is paraphrased from the Remedial Investigation Report (RUST, 1994a), Feasibility Study report (RUST, 1994b) and supplemented with information provided by former Nestle plant personnel. The facility was constructed in the 1930's on the site of an existing dairy farm and was used until 1948 for production and processing of dairy products such as condensed milk. Instant coffee production began in 1948, followed by production of decaffeinated coffee beginning in 1957. The production of soluble (instant) tea was conducted from 1964 to 1975. Decaffeination ended in 1986 and the plant was closed in late 1994. The approximate locations of the former plant facilities are illustrated in Figure 3 and include coffee and tea production facilities (including bean storage, decaffeination, centrifuging, drying and roasting areas), a laboratory, a water treatment facility and boiler room, chemical storage facilities, an engine room, maintenance and other utility shops, warehouse space and office space. AMEC Geomatrix, Inc. I:\Doc_Safe\9000s\9837.005\4000 REGULATORY\SCM_01.30.09\1_text\SCM Report Final.doc 7