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WEISS ASSOCIATES ; <br /> 2.2 VAULT USE AND IIISTORY <br /> According to DWG, no leaks from the vaults have occurred and only ethylene glycol <br /> and water-based solutions containing sodium disulfate, calcium chloride and copper <br /> sulfate have been stored in the tanks. Material Safety Data Sheets (MSDS) for the <br /> ethylene glycol, sodium disulfate, and calcium chloride are presented as Attachment A. <br /> No MSDS is available for the copper sulfate since this chemical is not currently used at <br /> the site. The construction characteristics of the vaults and the specific compounds stored <br /> in the vaults are described below. The locations of the vaults are shown on Figure 2 and <br /> the orientations of the vaults and structures surrounding the vaults are shown in Figures <br /> 3a through 3h. <br /> Tanks 1, 5 and 6 are concrete vaults containing ethylene glycol, an anti-freeze used <br /> for the refrigeration of the 3-million-pound-capacity walnut storage bins located along the <br /> eastern side of the property. A concrete sealer was applied to the interior surfaces of the <br /> tanks to decrease their permeability. Tank 1, a 1,200-gallon vault installed in 1976, is <br /> located adjacent to the east side of the walnut bins. Tank 5, also a 1,200-gallon vault, was <br /> installed in 1974 and is located about 300 ft. north of Tank 1. Tank 6, installed in 1974, <br /> is a 500-gallon vault located along the west side of the walnut bins. <br /> Tanks 7 and 8 are composed of poured concrete with fiberglass and asphalt lining, <br /> were installed in 1956, and are located against the northern wall of the processing <br /> building next to the main refrigeration unit. The interior corners of these vaults were <br /> sealed with roofing tar and gunite. Tank 7 has a capacity of 3,000 gallons and holds a <br /> chill water solution containing sodium dichromate. Tank 8 has a capacity of 5,000 gallons <br /> and holds a calcium chloride solution containing sodium dichromate. Copper sulfate may <br /> have been stored in these vaults in the past. <br /> W P 1F:\ALL\331D W G\331R1AP8.DOC:74-831-00:V 3.035 Page 5 <br />