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1 soil is 2500 ppm. The TTLC is a criterion the Department uses <br /> 2 to determine if a substance must be considered hazardous and <br /> 3 should not be construed as an approved cleanup criterion. <br /> 4 Acute effects of zinc exposure include metal fume fever which <br /> 5 manifests itself as fever, chills, cough, malaise, pain in <br /> 6 muscles and joints. Zinc exposure increases the leucocyte <br /> 7 count in the blood. <br /> 8 2 . 5 . 2 Lead <br /> 9 Lead is a heavy metal which acts as a systemic poison by <br /> 10 accumulating in body tissues. Its toxic effects are <br /> 11 particularly manifested by the central nervous system (CNS) . <br /> 12 Chronic effects include reproductive system damage and <br /> 13 fetotoxicity, lead cholic, anemia pallor, CNS effects, <br /> 14 peripheral neuropathy, gum and kidney damage. The LD-50 <br /> 15 (lethal dose that will cause death in 50% of a known population <br /> 16 which are usually laboratory rats) is 160-1000 milligrams <br /> 17 substance per kilogram body weight (mg/kg) . Lead was found <br /> 18 on-site at concentrations ranging up to 2300 ppm in soil <br /> 19 samples. The TTLC for lead in soil is 1000 ppm. <br /> 20 2 . 5.3 Chromium <br /> 21 Chromium is a heavy metal. Acute exposure to compounds <br /> 22 containing chromium will result in skin irritation and chronic <br /> 23 exposures may result in fibrosis of the lungs, cancer of the <br /> 24 lungs and nasal cavity. The TD-Low (lowest toxic dose that <br /> 25 produces toxic effects in humans or produces neoplatic, <br /> 26 carcinogenic or teratogenic effects in humans or animals) for <br /> 27 chromium is 150 mg/kg. Soil samples collected from the Site <br /> COURT PAPER <br /> STATEOF CALIFORNIA <br /> STD. 113 'REV. B 721 <br /> -4- <br /> 85 34769 <br />