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V-4�q� <br />l Idi <br />9075 1VCR 10 " Fort Lupton, CO 80621 <br />PHONE: 303 - 557 -1754 <br />rAX: 303 -557 -2933 <br />n m.ncconstructors.com <br />January 8, 2014 <br />Ctty of Westminster <br />Public Works and Utilities <br />Attn: Josh Nrims <br />4800 W. 92n Ave <br />Westminster, CO 80031 <br />Re: V;(greement for Compensation for Damage to Structures within 200 feet of mining <br />activities <br />To Whom It May Concern: <br />Northern Colorado Constructors, Inc. has a State of Colorado Division of Reclamation, <br />Mining, and Safety (DRMS) Reclamation Permit M1990 -098 to allow sand and gravel <br />mining on property within 200 feet of structures located on your property. The Colorado �x / <br />Mined''' Land Reclamation Act provides protection for your property, and specific <br />protection for your structures located within 200 feet of the mining activities. <br />DRMS Permit requires a notarized agreement between the permit holder and owners of <br />structures within 200 feet, providing compensation for any damage to the structure; or <br />preparation of an engineering evaluation acceptable to the DRMS, demonstrating that <br />such structures shall not be damaged by the mining activities if an agreement cannot be <br />reached. <br />Northern Colorado Constructors, Inc. has had an engineering evaluation performed to <br />determine acceptable setbacks from their proposed mining permit boundary and mining <br />limit to structures adjacent to the mining. The proposed mining slopes and setbacks <br />were analyzed using the XSTABL v5.105a computer program. XSTABL was designed <br />to analyze the slope stability of earth embankments subjected to several critical <br />situations that may occur during the life of the embankment. The procedure searches <br />for circular shear failures and automatically searches for the lowest safety factor. 2,000 <br />separate failure surfaces were analyzed for each case. The required minimum safety <br />factors are based on the current standards used by the Colorado State Engineer's <br />Office (SEO) for high hazard embankment darns, and industry accepted standards for <br />the evaluation of embankments during construction. The safety factors attained using <br />the setbacks shown on the attached Mining Plan are greater than the required safety <br />factors specified by the SEO for an earth embankment during construction, and an earth <br />RECEIVED <br />APR 0 8 2014 <br />Division of Reclamation. <br />Mining & Safety <br />