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Parks&Open Space Department 9755 Henderson (toad <br /> Adams County Regional Park Brighton,CO 80601 <br /> PHONE 303.637.8000 <br /> www.adcogov.urg Fax 303.637.8015 <br /> AD"S COUNTY <br /> January 22,2018 <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 /> We are submitting a request for a Technical Revision to the Mann Nyholt Pit Reclamation Plan, permit <br /> number M-1982-147. On two separate occasions, a slope failure has occurred in Lake 2 near the existing <br /> interconnect. We believe that ground water may be backing up and adding additional pressure to the <br /> embankment. In November and December 2017, a French Drain was added between Lakes 2 and 3 to <br /> alleviate this pressure. We are now planning to add new bored interconnects between Lakes 3 and 2 and <br /> between Lakes 2 and 1. The interconnects will have inverts at the bottom of the lake to allow for <br /> minimal dead storage. We will also excavate drainage channels in the bottom of the lakes to properly <br /> drain them and to minimize the dead pool storage of water. The attached plans show the design and <br /> additional details. <br /> If you have any questions or require additional information, please do not hesitate to contact Tara <br /> Schutter at 303-710-9108. Thank you for your time regarding this project. <br /> Cordially, <br /> Adams County Parks <br /> - BOARD OF COUNTY COMMISSIONERS - - <br /> Eva J. Henry Charles"Chaz"Tedesco Erik Hansen Steve O'Dorisio Mary Hodge <br /> DISTRICT 1 DISTRICT 2 DISTRICT 3 DISTRICT 4 DISTRICT 5 <br />