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Climax gol Bbd <br />A Freeport- McMoRan Company <br />December 16, 2009 <br />Certified Mail: 7002 2410 0005 5659 4828 <br />111" <br />Allen Sorenson v <br />State of Colorado <br />Division of Reclamation, Mining and Safety r/ <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: Upset Condition involving the overfl ow f process water from process <br />water tanks, Permit No. M- 1977 -342 <br />Mr. Sorenson: <br />Henderson Mill is providing this follow -up notice pursuant to Rule 8.2.3 of the DRMS <br />Rules and Regulations. Verbal notification was delivered to the voicemail of Allen <br />Sorenson at 12:47pm on December 11, 2009. <br />This notice is regarding the overflow of process water from the mill process water tanks, <br />which occurred on December 11, 2009 at — 9:40am due to upset conditions at the <br />Henderson Mill facility. Approximately 27,000 gallons of process water overflowed <br />from the mill process water tanks onto the ground in a event that lasted approximately 3- <br />4 minutes. <br />The following paragraphs correspond to the required elements of the follow -up written <br />notice requirement set forth in Rule 8.2.3, paragraphs (a) through (e), of the DRMS Rules <br />and Regulations: <br />(a) The pumps causing the overflow were manually shut off as soon as the <br />issue was noticed. The duration of the overtopping was a product of the <br />time required for an operator to drive to East Branch Pump House to <br />switch the pumps off. The overflowed process water was stopped by <br />berming at the north end of the tank pad, forcing the water to flow toward <br />the south. This drainage eventually re- enters the mill process water <br />impoundment, East Branch Reservoir. <br />(b) The water will not adversely impact human health, property or the <br />environment. This is based on the known chemistry of the process water <br />