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JAFARGE 7w) <br /> RECEIVED <br /> October 2, 2014 'OCT 0 6 2014 <br /> Colorado Division of Reclamation, Mining and Safety A,-'Division of Reclamation, <br /> 1313 Sherman Street, Room 215 Mining,&Safety <br /> Denver, CO 80203 <br /> Dear Mr. Cunningham, <br /> Please accept this respons�to your comments regarding the Technical Revision to the 112c <br /> mining permit(File Number M-1991-035) issued by DRMS for the Bluestone Pit in Jefferson <br /> County, CO. ✓ <br /> 1. Lafarge withdraws the following items from the request as they have already been <br /> approved by the DRMS: <br /> a. Breaching the silt ponds <br /> b. The minor grading changes <br /> c. The change to the seed mix <br /> 2. Lafarge does hold a discharge permit for the Bluestone site and you will find a copy <br /> enclosed. <br /> 3. The channel has not been designed to handle any specific storm event. The channel was <br /> designed in conjunction with the berm on the north side of the pond to simply direct <br /> water flow away from overtopping on the northern side of the pond. The overtopping lead <br /> to stormwater leaving the site during a storm event and causing damage to the adjacent <br /> property. <br /> 4. The channel has been designed as an emergency overflow that should only handle water <br /> in the most significant storm events. The channel was also cut from the existing surface <br /> and was not build with fill material that would be more susceptible to erosion. <br /> 5. The stormwater is expected to flow from the channel and continue its natural flow to the <br /> discharge. The channel is only designed to direct any water that would overtop the pond <br /> away from the northern side of the pond. <br /> 6. The placement of the berm is to prevent any water to overtop the pond and spill into the <br /> adjacent property. These berms along with the directional channel are designed to move <br /> any water that will overtop the pond to spill on to the Lafarge parcel and not the adjacent <br /> properties. <br /> We thank you for your consideration in this matter and request your prompt response to our <br /> request. If there are any questions, feel free to contact me at anytime. <br /> Sincerely <br /> Sean Frisch, AICP <br /> Land Manager <br /> Cell: 720-320-2451 <br /> Email: sean.frisch@lafarge.com <br /> LAFARGE NORTH AMERICA <br /> 8700 Bryn Mawr Ave,Ste 300 <br /> Chicago,IL 60631 <br />