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E470- <br />Public Highway Authority <br />E -470 Public Highway Authority <br />22470 E. 6th Parkway, Suite 100 <br />Aurora, CO 80018 <br />303.537.3700 Phone <br />303.537 3472 Fax <br />April 23, 2015 <br />Tyler O'Donnell <br />Department of Natural Resources <br />Colorado Division of Reclamation, Mining & Safety <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 -2243 <br />Re: Henderson Development, Permit No. M- 1980 -110 (Sandy Acres Pit) <br />Technical Revision Application <br />Dear Mr. O'Donnell: <br />I'm sending you the following in response to your email request of April 21, 2015: <br />1. Technical Revision Cover Sheet <br />2. Check for $216 <br />Adams County <br />Arapahoe County <br />Aurora, CO <br />Brighton, CO <br />Commerce City, CO <br />Douglas County <br />Parker, CO <br />Thornton, CO <br />I'd like to confirm that we plan to make the following minor change to our proposed reclamation <br />effort; we intend to use scrapers to transport the inert fill material from the Brannan pit across <br />our access road to the Sandy Acres Lake (formerly Henderson Development). This is a change <br />from our technical amendment application which planned on using a conveyor belt system <br />through a concrete box culvert under the road. <br />There are two main reasons for the change: <br />a. Time: The scraper haul operation should take around four to five months compared to an <br />estimated year for the conveyor belt system. This means that the lake will be filled in <br />sooner which in turn means that the evaporative losses from the lake will cease earlier. <br />b. Financial: The cost of the scraper haul is significantly less than the cost of the conveyor <br />belt option. We received bids late last year for the conveyor belt system and all four bids <br />were well above our budget for the project. <br />Traffic control on our access ramp (formerly Nome Street) will be by temporary traffic signals. <br />The contractor will have personnel on site to manually operate the signals and ensure traffic <br />flows in a safe and efficient manner. The time our traffic will be stopped by the scraper haul will <br />be limited to a maximum of two minutes. <br />Please call Neil Thomson at (303) 537 -3712 if you need more information or have questions <br />about the application. Alternatively, I'd be happy to come to your offices to meet and discuss the <br />application. <br />Sincerely, <br />Neil G. Th mson P.E. <br />Director of Engineering and Roadway Maintenance <br />E -470 Public Highway Authority <br />