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Mr. Robert Zuber <br />September 30, 2014 <br />Page 2 <br />Additionally, per a phone conversation with Mr. Rob Zuber and Mr. Tony Tennyson on <br />September 26, 2014, Mr. Zuber requested Tri -State address any potential freezing issues with the <br />trench drain where the pipe will be located oil the ground surface. Tri -State believes there will <br />not be any issues with the pipe during the winter months due to several factors. First, it is <br />estimated that the trench drain will flow approximately 250 gpm. Water in motion tends not to <br />freeze, thus this estimated quantity of water flowing through a pipe on the ground surface will be <br />adequate enough that the water will not freeze inside the pipe. Second, the pipe has a relatively <br />large diameter (18 "). Typically, freezing is associated with smaller pipes and a low spot in the <br />pipe that allows the water to freeze. We do not believe this will be an issue with an 18" diameter <br />pipe with a constant flow. Third, the flows anticipated from the backfill should have temperature <br />well above the ambient temperature on the surface pipe. Therefore, with the constant flow and <br />higher temperatures freezing should not occur. Due to the constant flow, pipe diameter, and <br />higher water temperatures, we do not believe that pipe freezing should be an issue at any time <br />after the pipe is installed. <br />Additionally, you stated that the trench drain pipe must not jeopardize the integrity of the Pond <br />013 embankment. The section of pipe that will be near the Pond 013 embankment will belying on the <br />ground surface directly adjacent to the Pond 013 embankment. This alignment will not impact the Pond <br />013 embankment or comprise its integrity in any manner. <br />Also included with this adequacy response package is a change of index sheet to ease <br />incorporation into the permit document, and materials revised in response to your adequacy comments. If <br />you have any questions regarding the enclosed adequacy review responses, please contact Tony Tennyson <br />at (970) 824 -1232 or ttenn son .tristate .org. <br />Sincerely, <br />Daniel J. C siraro <br />Senior Manager <br />Environmental Services <br />DJC:TT:pvt <br />Enclosures <br />cc: Frank Ferris, WFC (via email) <br />Chris Gilbreath (via email) <br />Jason Storey (via email) <br />Tony Tennyson (via email) <br />AN EQUAL OPPORTUNITY I AFFIRMATIVE ACTION EMPLOYER <br />A Touchstone Energq'Oxwperative �' <br />