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ASPHALT <br /> SPECIALTIES CO . <br /> 10100 Dallas St. • Henderson, CO 80640 • (303)289-8555 • Fax: (720)289-7707 <br /> TECHNICAL REVISION SUBMITTAL <br /> Date: November 25, 2019 <br /> To: Mr. Eric Scott, P.G. <br /> Environmental Protection Specialist <br /> Department of Natural Resources—Division of Reclamation, Mining, and Safety <br /> From: Mr. Greg Geras, P.G. <br /> Land Resource Manager <br /> Asphalt Specialties Co., Inc. <br /> Permit No: M-2004-009 <br /> Site: Turnpike Mining Resource <br /> Address: 599 Highway 52, Erie, CO 80516 <br /> Re: Technical Revision No. 6 (TR-06)to Regular 112 Permit <br /> Asphalt Specialties Co., Inc. (ASCI) is submitting this Technical Revision No. 6 (TR-06) for the <br /> Turnpike Mining Resource (DRMS Permit No: M-2004-009) (Site) to update relevant portions of <br /> Exhibit C-2 Mine Plan Maps and Exhibit D—Mining Plan regarding operations along the Plumb and <br /> Dailey Ditch located west of Boulder Creek on the North Half of the Site. ASCI was contacted by <br /> the Plumb and Dailey Ditch Company to coordinate activities to line the Plumb and Dailey Ditch <br /> with concrete during the 2019 — 2020 non-irrigation season (non-irrigation season is generally <br /> October/November 1st to April 1'). To facilitate the project schedule, ASCI has entered into an <br /> agreement with the Plumb and Dailey Ditch Company to mine and backfill the area encompassing <br /> the existing ditch while the ditch is not in operation. The area to be mined is approximately 1,400- <br /> feet (i.e., length of ditch to be lined) x 220-feet (i.e., 20-foot width of the ditch plus an additional <br /> 100-feet on both sides). After mining and backfill, the Plumb & Dailey Ditch Company will line the <br /> ditch with concrete. The lining of the Plumb and Dailey Ditch with concrete will provide hydraulic <br /> isolation from the local water table and therefore mitigate the need to construct the hydraulic barrier <br /> trench approved in 2012 as part of Amendment 2 for the Site prior to future mining of Cells 4 and 5. <br /> 6.4.3 EXHIBIT C-2—MINE PLAN MAPS <br /> ASCI will mine and backfill the approximate 1,400-foot x 220-foot area where the Plumb and Dailey <br /> Ditch is located (and includes portions of Cells 4 and 5) during the 2019 — 2020 non-irrigation <br /> season. A 75-foot buffer will be left in place adjacent to both the north and south property lines. The <br /> following features have been revised on the Exhibit C-2—Mine Plan Maps. <br />