2017-11-02_REVISION - M1979221 - Laserfiche WebLink

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0010 General Shale Building The American Dream® October 20, 2017 Colorado Division of Reclamation, Mining, and Safety Mr. Peter Hays Environmental Protection Specialist 1313 Sherman Street, Room 215 Denver, CO 80203 Re: M-1979-221 Ute Mine, Douglas County, Colorado Technical Revision Inert Fill Import Dear Mr. Hays: General Shale Brick, Inc. (GSB) is providing Technical Revision JR) that is a notice of intent to backfill inert structural fill, generated outside of the permit area at the Ute Mine per rule 3.1.5.9. We have enclosed a check for the TR fee of $216. The inert fill material will consist of primarily sand and clay from the Waste Connection's Sedalia Landfill adjacent to the Ute Mine. The sand and clay material is generated during the construction of the cells for the landfill. It should be noted that the landfill was once part of the Ute Mine. The first placement will be in late October 2017 and occur every one to two years after that if General Shale elects to place additional clay and sand material into the pit. No trash or other waste will be placed in General Shale's Ute Mine. GSB will haul scrap brick (grog) generated from the GSB's Denver brick plant. 1. Approximately 3,000 to 4,000 tons will be placed on the west and east ends, as space allows, of the clay stockpile pad area located in the northeast permit boundary. The grog will be blended and compacted with the existing pad area floor material for a firmer pad floor using scrapers and water truck during the next mining campaign in 3 to 4 years. 2. An additional 6,000 to 7,000 tons of grog, if even hauled, would be placed into the mined out areas of the pit. Backfill would start in Permit Boundary Southwest of 6.80 acres working from east to west. After mining and reclamation were complete in the southwest permit boundary backfilling would continue in the northeast permit boundary. Blending of Grog in Pit The grog will be blended with overburden from the overburden stockpiles or the material from the Sedalia Landfill into a homogenous stockpile using a front end loader (loader) or scraper before being placed in the pit. To start, a ratio of 50% grog to 50% overburden will be used. At the equipment operator's discretion, the ratio of grog to overburden will be adjusted up or down based on how well the blended grog compacts. Compaction of Grog in Pit The blended grog will be placed on the floor of the previously mined out pit in 1-2 foot thick layers, see attached Ute Site Map. The loader, with a full bucket, will wheel roll each 1-2 foot thick layer until the materials are tight, meaning the tires sink 1-2 inches into the fill based on visual inspection of the fill. If