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Show !.., ! ! EPA Docket No. CERCLA-vm-93-10 3 Utah Copper Company built a tailings north of Bingham ,Creek on property later acquired by In 1914, Utah Apex Kennecott (hereinafter "Kennecott Tailings"). Company built a, tailings impoundment south of Bingham Creek on· property later acquired by ARCO (hereinafter "ARCa Tailings") Tailings fram some of the mills in Bingham, Canyon were disposed of into these impoundments while Utah Apex Company and Utah Copper Company were the respective owners of these,properties. Sampling activities conducted by EPA in September 1992, at the Kennecott Tailings, revealed lead levels ranging between 270 and 8400 mg/Kg. Sampling activities conducted at the ARCO Tailings at the same time showed an average lead concentration of 6,244 mg/Kg with a range of,l,SOO to 15,000 mg/Kg. 8. . In 1905 impoundment . 9. Runoff events and flooding caused tailings to erode from the Kennecott and ARca Tailings into Bingham Creek Channel. At present the channel flows inter.mittently due to localized storms and snow melt. However, this flow; in the channe.l has and will continue to transport fine-grained particles such as those In a4dition, a County particles present in the tailings. flow in a 100 year flood event estimates that engineering 'study This volume of would be approximately· 400 cubic feet per second. flow in the channel would transport significant volumes tailings related material deposited in the channel. f . J Sampling and analyses performed by EPA and Kennecott independently have identifie lead, arsenic 'and other hazardous.' In July/August l.992, EPA collected 85 substances at the Site. Channel between 4800 West and 3200 Creek from the Bingham samples West and found lead and ,arsenic averaging 5',6'61., mg/Kg and 202 mg/Kg, respectively. The concentrations of lead ranged from 2.00 to 23,0'00 mg/Kg and the concentrations of arsenic ranged from 9 Similar levels of lead and azsenf,c are found to 890 mg/Kg. progressively up the channel as demonstrated by samples collected Samples collected'by EPA from 8600 South by Kennecott in l.990. l.0. down channel chrough the Brookside Trailer Park also elevated lead. show , . ENDANGERMENT l.l.. Arsenic is a human carcinogen •. Arsenic can be acutely and chronically poisonous and can be fatal if ingested or inhaled in sufficient quantities by humans, livestock, and wildlife. Arsenic compounds are absorbed into the body primarily through inhalation or ingestion. Lead is a cumulative poison which can cause neurologic, and blood cell damage in humans. Some lead compounds are also animal carcinogens adversely affecting the lungs and Children ,under the age of seven years are especially kidneys. sensitive to the effects of lead. l.2. kidney, , \. |
