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PFARCE <br />April 27, 2015 <br />RECEIVED <br />SAY n 1 2015 <br />-rj�, DIVISION OF RECLAMATION <br />MINING AND SAFETY <br />Colorado Division of Reclamation, Mining and Safety <br />Attn: Peter Hays <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Dear Mr. Hays, - rR -0I/.. <br />Please accept this letter and enclosed reclamation recommendation study as Lafarge's request for <br />a Technical Revision to the Nelson Pit (File Number M- 1974 -070). <br />Due to the higher levels of soil salinity found at the Nelson Pit, Lafarge is requesting a revision <br />to the approved seed mix. Lafarge is proposing a more salt tolerant mix that will create better <br />growing conditions and a better likelihood of vegetation success. The seed mix to be used will be <br />a moderately salt tolerant seed mix and the application rates in pounds of pure live seed per acres <br />are as follows: <br />Common Name <br />I Scientific Name <br />PL <br />acre <br />acre <br />ft <br />ft <br />% of Mix <br />Alkali <br />Alkali grass <br />Puccinelliadistans <br />(_ _ ) _ <br />0.4 <br />12.0 <br />��_ <br />Slender <br />Elymus <br />--20% <br />Wheatgrass <br />trach caulus <br />3.3 <br />12.0_ <br />20% <br />Bottlebrush <br />Elymus elymoides <br />S uirreltail <br />2.7 <br />1_2.0 <br />20% <br />Newhy <br />v_ <br />_ <br />Hybrid wheatgrass <br />Saltlander <br />2.1 <br />6.0 <br />10% <br />Sporobolus <br />Sand Dropseed <br />_ <br />cryptandrus <br />0.0 <br />6.0 <br />10% <br />Prairie <br />Calamovilfa <br />Sandreed <br />longifolia <br />1.0 <br />6.0 <br />10% <br />Basin WiIdrye <br />Elymus cinereus <br />2.0 <br />6.0 <br />10% <br />ITotal <br />-- <br />11.6 <br />60.0 <br />100% <br />✓ AF & Report <br />missing 2015 Fee <br />✓ No Violations <br />The soil will be ripped and the seed will be drill seeded where possible and broadcast seed in <br />areas that are difficult to access. <br />In conjunction with these seed treatments, Lafarge plans regular mowing and spraying of the site <br />to control less noxious weeds on the site. Mowing and spraying are generally most effective <br />when done in the spring and fall seasons. Lafarge plans to schedule these activities for these <br />times and will add additional treatments when needed throughout the year. <br />LAFARGE NORTH AMERICA <br />8700 Bryn Mawr Ave, Ste 300 <br />Chicago, IL 60631 <br />