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Greg Lewicki And Associates, PLLC <br /> 3375 W.Powers Circle Phone: (720)842-5321 Fax(303)346-6934 <br /> Littleton,CO 80123 E-mail: info'a lew•ieki.biz <br /> May 2, 2019 <br /> Eric Scott <br /> Colorado Division of Reclamation, Mining and Safety <br /> 1313 Sherman St, Rm 215 <br /> Denver, CO 80203 <br /> RE: Shaffers Crossing, Elk Creek Sand & Gravel, LLC M-1978-208 <br /> Technical Revision—Highwall Configuration and Geology <br /> Mr. Scott: <br /> In February 2019, the Mined Land Reclamation Board issued an order to Elk Creek Sand and <br /> Gravel, LLC regarding the highwall present at their quarry at Shaffers Crossing. The Board <br /> Order specifically requires the following: <br /> 1. Provide an accurate description of the existing high-wall material(s), geotechnical <br /> characteristics, bench and wall configuration, and its location relative to the approved <br /> permit boundary. <br /> 2. Geotechnical evaluation of the stability of the existing high-wall configuration, with <br /> special consideration given to identi existing areas of potential weakness and/or <br /> instability, and for recommendations to correct these issues if observed. <br /> 3. Determination if the existing high-wall conforms to the requirements of existing permit <br /> stipulation #1, which states that the quarry must be configured with 12 foot benches by <br /> 35 foot high walls, with zones of weathered rock laid back to no steeper than 1H:1V. <br /> 4. If the existing high-wall does not conform to the requirements listed in stipulation #1, <br /> specific what additional work will be required to achieve the currently required <br /> configuration. It will also need to determine if any additional work required will be <br /> able to be completed within the existing permit boundary, or if a permit conversion will <br /> be required to enlarge the permitted area. <br /> 5. This submittal shall be completed and certified by an independent, third-party licensed <br /> geotechnical engineer. <br /> 6. The geotechnical evaluation as described above will supersede the existing stipulation <br /> #2, and will be an enforceable part of the annual reporting requirements for this site <br /> until such time as a revision to juste the removal of this reporting requirement is <br /> approved by the Division. <br /> Shaffers Crossing TR 1 <br /> (.reg Ie»ic►t and Associates.II IA <br />