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y WEISS ASSOCIATES PM <br /> 1.1 CHEMICALS PRESENT AND THEIR POTENTIAL HAZARDS <br /> The following chemicals are of concern during soil boring and sampling: <br /> o ethylene glycol <br /> o sodium dichromate. <br /> o calcium chloride <br /> o copper sulfate <br /> Pertinent information regarding these chemicals is summarized below from: <br /> o Material Safety Data Sheets (MSDS) provided by DWG. <br /> o Dangerous Properties of Industrial Materials, Sixth Edition, N. Irving Sax (1984) <br /> o Pocket Guide to Chemical Hazards, NIOSH (1985) <br /> o Merck Index, Tenth Edition, (1983) <br /> It is important to recognize that the chemical properties and toxicological <br /> information presented below are for pure chemicals, and it is unlikely that the chemicals <br /> will be encountered in their pure form during this investigation. <br /> 1.1.1 Ethylene Glycol <br /> Ethylene glycol is an organic chemical used as an anti-freeze for refrigeration of <br /> the walnut storage bins and is stored in tanks 1, 5 and 6. It is soluble in water, has a <br /> threshold limit value (TLV) of 100 parts per million (ppm.) and is very toxic in <br /> particulate form if it is inhaled. It is moderately explosive, with a flash point of 232oF, <br /> an autoignition temperature of 752oF, a lower explosive limit (LEL) of 3.2% and a vapor <br /> pressure of 0.05 mm of mercury at 20oC. When ingested it can cause vomiting, coma, <br /> respiratory failure and death. A lethal dose for humans is 100 ml pure ethylene glycol. <br /> 1.1.2 Sodium Dichromate. <br /> Sodium dichromate. is a non-volatile, water-soluble salt used to produce a chill-water <br /> solution for the main plant refrigeration system. This chemical is used in liquid form in <br /> WP1F:\ALL\991DWG\33IRIAP8.DOC:74-331-00:V1.036 Page 2 <br />