SITE INFORMATION AND CORRESPONDENCE

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II . FINDINGS OF FACT 2 . 1 . Responsible Parties 2 . 1. 1 . Robert E. Rupka, the current property owner, purchased the Site in 1981. 2 . 1. 2 . North Coast Helicopter Service, Inc. was an agricultural chemical aerial application business that was operated at the Site from an unknown date to 1985. 2 . 2 . Site Investigation and Sampling Results 2 . 2 . 1. On October 28 , 1982, Department representatives collected four surface soil samples and one liquid sample at the Site as part of a routine generator inspection. The liquid sample revealed no pesticide contamination. Analytical results from the soil samples revealed two pesticides in concentrations which exceeded the Toxic Threshold Limit Concentrations (TTLC) (as specified in the California Administrative Code, Title 22 , Chapter 30, Section 66699) . Dichlorodiphenyldichloroethylene (DDE) occurred at 78 . 8 mg/kg, which was 78. 8 times the TTLC, and toxaphene occurred at 1, 880 mg/kg, which was 367 times the TTLC. 2 . 2 . 2 . On September 25, 1984 , Department representatives collected seven surface soil samples at the Site as part of a routine Generator Inspection. Analytical results revealed four pesticides in concentrations which exceeded their TTLC values. 2 , 4-D occurred at 3 , 094 mg/kg which was 30. 9 times the TTLC, DDE occurred at 2 . 5 mg/kg which was 2 . 5 times the TTLC, dichlorodi- phenyltrichloroethane (DDT) occurred at 3 . 7 mg/kg which was 3 . 7 times the TTLC, and toxaphene occurred at 13 mg/kg which was 2 . 6 times the TTLC. 2 . 3 . Health Risks of Hazardous Substances Found 2 . 3 . 1. Toxaphene is a human poison by ingestion and possibly other routes. Toxaphene is an experimental carcinogen, tumorigen and teratogen. Human systemic effects by ingestion and skin contact are somnolence, convulsions or effect on seizure threshold, coma and allergic skin dermatitis. Toxaphene is a skin irritant and is absorbed through the skin. Human liver injury has been reported. Lethal amounts of toxaphene can enter the body through the mouth, lungs, and skin. 2 . 3 . 2 . Dichlorodiphenyltrichloroethane (DDT) is a human poison by ingestion and possibly other routes. It is an experimental poison by ingestion, skin contact, subcutaneous, intravenous, and intraperitoneal routes. DDT is a suspected human carcinogen and an experimental carcinogen, neoplastigen, tumorigen and teratogen. Human systemic effects by ingestion are anesthesia, convulsions, headache, analgesia, cardiac arrythmias, nausea or vomiting, sweating and unspecified pulmonary changes.