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1 contained up to 57 ppm chromium. The Soluble Threshold Limit <br /> 2 Concentration (STLC) is 5 ppm. The TTLC for chromium VI is 500 <br /> 3 ppm. <br /> 4 2 . 5 . 4 Copper <br /> 5 Copper is an essential nutrient in minute quantities but is <br /> 61 toxic at higher exposures. Acute exposure to copper dust or <br /> 7 fumes may result in metal fume fever and lead to increased risk <br /> 8 of toxic effects due to copper retention in the body for <br /> 9 persons with Wilson's Disease. Other acute effects include <br /> 10 skin and eye irritation, gastro-intestinal (GI) and/or <br /> 11 respiratory system distress and anemia. Chronic exposures <br /> 12 result in ulceration of the nasal septum. The human TD-Low is <br /> 13 120 micrograms copper per kilogram of body weight. Samples <br /> 14 from the Site contained 38 ppm copper. The STLC for soil is 25 <br /> 15 ppm copper and the TTLC for copper in soil is 2 ,500 ppm. <br /> 16 2 .5. 5 Arsenic <br /> 17 Soil samples collected from the Site contained up to 5.7 ppm <br /> 18 arsenic. The STLC for arsenic is 5 ppm and the TTLC is 500 <br /> 19 ppm. The acute effects include irritation to skin, eyes, and <br /> 20 mucous membranes, GI tract distress and poisoning. Chronic <br /> 21 exposure effects are dermatitis, keratoses, skin cancer, <br /> 22 polyneuritis, chronic hepatitis and cirrhosis, GI tract <br /> 23 distress and perforation of nasal septum. The LD-Low for <br /> 24 arsenic is 10-300 mg/kg. (Acute LD-low is the lowest dose of a <br /> 25 substance introduced orally or dermally that over a given <br /> 26 period of time has reportedly caused death in humans. ) <br /> 27 <br /> COURT PAPER <br /> STATEOF CALIFORNIA <br /> STD. 113 (REV. 8 72) <br /> -5- <br /> 85 34769 <br />