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L <br />G.M. NAGEL <br />STRUCTURAL ENGINEERING <br />FACILITY ENGINEERING <br />PROJECT REVIEWS AND PROPERTY REPORTS <br />Mr. Dan Hernandez <br />Mined Land Reclamation Division <br />1313 Sherman Street, Suite 215 <br />Denver, Colorado 80203-2273 <br />~ III IIIIIIIIIIIII III <br />~~ `L~ ~ CONSULTING ENGINEER <br />MEMBER AMERICnN SOCIETY OF CIVIL ENGINEERS <br />MEMBER AMERICAN SOCIETY OF MECHANICAL ENGINEERS <br />MEMBER INTERNATIONAL CONFERENCE OF BUILOINO OFFICIALS <br />October 21, 1909 ~~~~~~,~® <br />0 C T '? 4 198~~ <br />MIIV~J LiA(~~i <br />RECLAMATICR! OI~~ISION <br />Re: Snyder Quarry Permit M-77-210, AM 03 and Violations <br />Dear Mr. Hernandez, <br />With this letter I am submitting concerns and recommendations as regt.ested by <br />the Ooard in the hearing of October 18, 1989, for a cure to previous <br />violations. This letter will replace my letter of September 25, 1989. This <br />letter is written after a review of the October 1989 Castle Concrete <br />Corrective Action Plan (CAP) for the Snyder Quarry access road. My concerns <br />and recommendations are as follows: <br />Concern 1. The adjacent stream channel has been damaged by silt and <br />sedimentation from the quarry and access road. Enclosed are copies <br />of the photographs from my September 25th letter. There is a need to <br />prevent additional damage to this beyond boundary property. <br />Precautions need to be taken to prevent additional damage. Some of <br />these precautions I am recommending exceed what would be done f~~r an <br />initial pre-damage review of the mining operation. The reason For <br />the more cautious approach is the fact that the earlier methods have <br />not worked satisfactorily, resulting in the damages. Also the operator <br />is not cleaning or desilting the stream channel and these <br />recommendations are a strong ounce of prevention to prevent adding to <br />the sedimentation problem. <br />Recommendation 1. If berms are used for vehicular restraint, they <br />should be composed of non-eroding, non-sediment producing mater~.al. The <br />berms should be placed far enough from the shoulder that they are not <br />pushed or eroded down the hillside. A berm type of restraint should <br />only be used where a geotechnical engineer indicates the slope eatable <br />enough to support the added surcharge loading. Where berms cannot be <br />used the guardrail concept should be implemented to comply with MSHA <br />regulations. This recommendation would require removing some earth <br />berms, moving and reshaping others, and seeding and vegetating B11 <br />earthen type berms. <br />Recommendation 2. Silt laden waters and sludge shall be removec <br />from the water impoundment area and pumped to the new silt retention <br />pond. <br />Majestic Building Colorado Springs, Colorado 80903 <br />7 East Bijou, Suite 214 Pllone (719) 577-9797 <br />