2011-12-20_PERMIT FILE - P2011032

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Erickson, Wally From: Erickson, Wally Sent: Tuesday, December 20, 2011 4:15 PM To: 'Mike Thompson' Subject: RE: sedimentation pond near Silverton I will place copy of the email train in the file to document DWR response regarding Rule 3.1.6(1)(a). One down. From: Mike Thompson f mailto:mt @reardonsteel.usl Sent: Tuesday, December 20, 2011 4:00 PM To: Erickson, Wally Subject: FW: sedimentation pond near Silverton Wally - Please see below and attached. Will this suffice for 3.1.6(1)(a)? Thanks, Mike From: Titus, Jeff fmailto:Jeff.Titus @state.co.us] Sent: Tuesday, December 20, 2011 3:56 PM To: Mike Thompson Subject: RE: sedimentation pond near Silverton Hi Jeff - Thanks for taking my call today. The following is a summary of our phone call: DE C) ' i O 11 From: Mike Thompson f mailto:mt@reardonsteel.usl Sent: Tuesday, December 20, 2011 3:32 PM To: Titus, Jeff Subject: sedimentation pond near Silverton 1 U y4 c. - r, n ne p_ 2.011 -032 - D tn/( co.v1Me.i 1 L cop, You do not need to apply for a water right. 1 have been made aware of the existence of the structure and diversion. No further action is necessary at this time. Running Sun Advisory Services has submitted an application for mineral exploration with the Division of Reclamation Mining and Safety. The exploration site is called the Oyama Tunnel and is located at an elevation of ^'12,100 adjacent to Stony Pass in eastern San Juan County. The Oyama Tunnel was last active in the mid -1980s and has a pre- existing discharge with continuous flows of — 20gpm. From the tunnel portal these flows are directed into a bermed channel that leads to a shallow sedimentation pond, also constructed in the 1980s. The pond then has a reinforced low -point in its dam where water continuously flows out. The purpose of the pond is to allow suspended solids to fall out of solution before the flows reach the receiving drainage (Stony Gulch). The pond is oval shaped, with a long dimension of — 115 feet and a short dimension of ^'45 feet, and has an average depth of "'3 feet. Using these dimensions results in maximum holding capacity of ^'107,000 gallons if the pond were a perfect rectangle, which it is not.