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ressara water, uz <br /> a woman owned water resources engineering firm 13101 Cavanaugh Road <br /> phone:303.710.9108 <br /> e-mail:tara@tessarawater.com <br /> website:www.tessarawater.com <br /> September 6, 2017 <br /> Mr.Jared Ebert <br /> State of Colorado <br /> Division of Reclamation, Mining and Safety <br /> 1313 Sherman Street <br /> Denver, CO 80203 <br /> Re: Technical Revision Request for Mann Nyholt Pit—M-1982-147 <br /> Dear Mr. Ebert: <br /> On behalf of the permit holder,Adams County, we are submitting a request for a Technical Revision to the <br /> Mann Nyholt Pit Reclamation Plan, permit number M-1982-147. On two separate occasions, a slope failure <br /> has occurred in Lake 2 near the existing interconnect. We believe that ground water may be backing up <br /> and adding additional pressure to the embankment. In order to alleviate this pressure, a French drain is <br /> proposed between Lakes 2 and 3. The French Drain will be 300 feet long at a depth of approximately 21 <br /> feet below grade. The drain will consist of an 8 inch perforated PVC pipe with clean gravel bedding <br /> surrounding the pipe for approximately 6 feet. Imported pit run and native backfill will be placed above the <br /> gravel bedding. Please see the attached plans and specifications for additional design details. <br /> If you have any questions or require additional information, please do not hesitate to contact me at 303- <br /> 710-9108. Thank you for your time regarding this project. <br /> Cordially, <br /> Tessara Water <br /> Tara Digitally signed by Tara Schuster <br /> DN.w-Tara Schuster,�Tessara <br /> Water,"C,_' <br /> S c h u tte r emaN=tara@tessarawater.ctsm, <br /> c�u5 <br /> Date:2017.09.061&21:26-06'00' <br /> Tara Schutter, P.E. <br /> President <br /> TW File No. 13-513 <br />