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WEISS ASSOCw7ES <br /> has been in operation since the 1950s. The five underground storage tanks investigated during <br /> this project contain plant refrigeration fluids. Tanks 1, 5 and 6 are concrete, were installed <br /> between 1974 and 1976, and contain propylene glycol. According to DWG,ethylene glycol was <br /> also stored in these tanks on at least one occasion. In our July 20, 1988 work plan, Tanks 1, <br /> 5 and 6 were described as containing ethylene glycol. However, we understand from DWG <br /> personnel that these tanks have historically contained only propylene glycol, with the <br /> exception noted above. Tanks I and 5 have 1,200 gallon capacities and Tank 6 has a 500 gallon <br /> capacity. The tanks are located along the eastern side of the property adjacent to the 3 million <br /> pound capacity walnut storage bins (Figure 2). Tanks 7 and 8 are constructed of poured <br /> concrete and are lined with fiberglass and asphalt. Tank 7 contains a sodium dichromate chill <br /> water solution. Tank 8 contains a calcium chloride and sodium dichromate chill water <br /> solution. Tanks 7 and 8 have 3,000 and 5,000 gallon capacities, respectively, and are located <br /> against the north wall of the processing building. Additional tank construction details and <br /> a detailed discussion of the site setting and subsurface conditions are presented in the WA July <br /> 20, 1988 Sampling Plan. <br /> F:\ALL\331DWG\331L1FE9.WP Page 3 <br />