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Show EPA Docket No. CERCLA-VIU-93-10 8-. 3 Copper Company built a tailings Bingham Creek on property later acquired by Kennecott (hereinafter "Kennecott Tailings"). In 1914, Utah Apex Company built a tailings impoundment south of Bingham Creek on· property later acquired by ARca (hereinafter "ARCO Tailings") Tailings from 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 S'400 mg/Kg. Sampling activities conducted at the ARca Tailings In 1905 Utah impoundment north of . at the same time showed an mg/Kg with. a range of.1,SOO average to lead concentration of' 6,244' 15,000 mg/Kg. 9. Runoff events and flooding caused tailngs to erode from the Kennecott and ARCO Tailings into Bingham Creek Channel. At present the channel flows intermittently due to localized storms and snow melt. However, this flow' in the channel has and wil continue to transport fine-grained particles such as those In addition, a County particles present in the tailings. in a 100 year flood event that flow engineering' study estimates would'be approximately 400 cubic feet per second. This volume of flow in the channel would transport significant volumes tailingsrelated material deposited in the channel. - Sampling and analyses perfor.med by EPA and Kennecott independently have identified lead, arsenic and other hazardous In July/August 1992, EPA collected 85 substances at the Site. Creek Channel between 4S00 West and 3200 the from Bingham samples West and found lead 'and arsenic averaging 5,661 mg/Kg and' 202 mg/g, respectively. The concentrations of lead ranged from ZOO to 23,000 mg/Kg and the concentrations of arsenic ranged from 9 Similar levels of- lead and arsenic are found t.O 890 mg/Kg. progressively up' the channel as· demonstrated by·samples collected by' Kennecott in 1990. Samples collected by EPA from 8600 South down channel through the Brookside Trailer Park also show 10 •. eJ.evated lead. " ENDANGERMENT 1. Arsenic is a human carcinogen .. Arsenic can be acutely 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 ngestion. and Lead is a cumulative poison which can cause neurologic, and blood cell damage in humans. Some lead compounds are also animal cacinogens adversely affecting the lungs and kidneys. Children.under the age of seven years are especially sensitive to the effects of lead. . 12. kidney, |
