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IRIS <br />MITIGATION AND DESIGN, INC. <br />Environmental Consulting <br />Date: August 18, 2011 <br />Memorandum <br />IRIS MITIGATION AND DESIGN, INC. <br />3450 W. 32nd Avenue, 2nd Floor <br />Denver Colorado 80211 <br />Phone: 720 -272 -1985 <br />bleisure@irismitigation.com <br />To: Andrew Earles, P.E., WWE, Wayne Lorenz, P.E., WWE, Jon Jones, P.E., WWE <br />From: Blair Leisure, IRIS Mitigation and Design, Inc. <br />CC: <br />Re: Schwartzwalder Mine — Recent Preble's Meadow Jumping Mouse Trapping <br />On Wednesday, August 17, 2011, 1 received a call from Jefferson County Open Space Biologist <br />Frank Kunze regarding his recent trapping efforts along Ralston Creek. Frank explained to me <br />that he had a positive Preble's Meadow Jumping Mouse (Zapus hudsonius preblei) (PMJM) <br />trapping earlier this week approximately 1 1 /2 miles upstream from the Schwartzwalder Mine site <br />along Ralston Creek. Frank explained that during his 400 trap -night study, he had one positive <br />trapping of a PMJM along Ralston Creek just upstream of the mine site. Frank has already <br />called Pete Plage with the U.S. Fish and Wildlife Service to describe the positive trapping of <br />PMJM. <br />This positive trapping will not change or alter our direction or protocol for our proposed phased <br />work at the Schwartzwalder Mine. However, Frank Kunze suggested that a habitat corridor be <br />maintained along the creek as much as possible to allow PMJM to travel along Ralston Creek <br />as needed. <br />Schwartrwaider Mine — PMJM Update <br />August 18, 2011 <br />/ - 1y77 - 300 <br />Page 1 <br />