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L 0 IAA <br /> ,12 P <br /> Interoffice Memorandum <br /> Date 12 September 2019 <br /> From: R. Reilley <br /> To: Jason Musick <br /> Re: Williams Fork Mine(Permit Nu. C1981044 <br /> Aerial Bromus tectorum Survey Results <br /> As requested, Leigh Simmons accompanied me on an inspection of the Williams Fork Site on 27 August <br /> 2019. The purpose of our inspection was to quantify, if possible, areas of concern for Bromus tectorum, <br /> commonly known as cheat grass or downy broom, in relation with a Phase II bond release request by Moffat <br /> County Mining. Bromus Tectorum is a C listed, cool weather grass, on the State of Colorado Department of <br /> Agriculture weed management plan. <br /> Aerial imagery was acquired by Leigh Simmons using a UAV. Documentation of the collection parameters <br /> and the data processing procedures can be found in his memo dated 10 September 2019. <br /> Total acreage of the bond release request comprises 273 acres, of which 219 acres make up the Utah Tract <br /> and 56.5 acres are located in the Strip Pit. <br /> Bromus tectorum was identified in the June Inspection as per the inspection report dated 25 June 2019, on <br /> a south facing slope, of thin soils at the 6300 elevation as shown by the red polygons, and in small areas <br /> near ponds 9AP3 and PAP2, shown as points at the top of Map 1 below. <br /> The areas outlined in red represent areas of concern for <br /> w� <br /> Bromus tectorum. They comprise a total of 2.36 acres as <br /> measured in ESRI's ArcCollector application with Samsung <br /> Galaxy smart phone as the receiver. <br /> The green points at the top of the map illustrate small <br /> areas of Bromus tectorum associated with topsoil piles. <br /> � These small areas comprise less than an additional acre of <br /> the vegetation in question. <br /> �-m As per the 1995 Guidelines Regarding Coal Mine Bond <br /> Release Issues,the allowable relative cover contribution of <br /> ` M ,at annual and biennial species should not exceed 10%and no <br /> U, noxious weeds may be counted toward the vegetation <br /> - k <br /> success standard. <br /> Map 1: Areas of Bromus tectorum. <br /> cn <br /> 1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 htt ://minin .state.co.us <br /> Jared S. Polis, Governor Dan Gibbs, Executive Director Virginia Brannon, Director <br />