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( RAI RI Y tIR( I ti,II <br /> Nt;IiNi'. NS Fti P <br /> October 4,2024 <br /> DRMS <br /> Nikie Gagnon <br /> 1313 Sherman St, <br /> Denver,CO 80203 <br /> RE: DRMS Permit M-2000-144,North La Poudre Gravel Mine Technical Revision Two(TR2) <br /> Dear Ms.Gagnon: <br /> This letter discusses the proposed Technical Revision#2(TR2)for the North La Poudre Gravel Mine. The <br /> mine is located on the southeast corner of Colorado Boulevard and State Highway 392 in Weld County, <br /> Colorado. More specifically,the mine is within the north half of Section 19,Township 6 North, Range 67 <br /> West. Refer to Figure 1 included with this submittal. <br /> The following summarizes the current conditions at the mine: <br /> - Mining ceased at the North La Poudre Mine in 2023 and the mine is now actively being reclaimed. <br /> - Figure 2 shows existing site conditions,bonding areas,and parcel owners. <br /> - Figure 3 shows the revised reclamation plan. <br /> - The West area, amended into the North La Poudre Mine in 2017 has been mined out and is <br /> backfilled to grade and reclaimed. Figure 2 shows the areas that require overseeding. A photo <br /> has been attached showing the West area on April 4th,2024. <br /> - The Middle area, which historically contained two mining cells is actively being backfilled to limit <br /> exposed groundwater. Figure 2 shows the areas that have been backfilled and the areas that still <br /> require fill. <br /> - The East area was never mined or disturbed and a picture from April 4th, 2024 of this area is <br /> attached to this TR. <br /> Proposed Technical Revisions to the final reclamation plan: <br /> - The pond located in the East area is proposed to be clay lined. A preliminary design memo and <br /> typical section are shown in the Figures and attached to this TR. An example set of day liner <br /> technical specifications is attached. Water will not be held for more than 72 hours per Division of <br /> Water Resources(DWR)rules and substitute water supply plans will be submitted to the DWR. <br /> - The mining cells located in the Middle area will be backfilled to rangeland similar to the West and <br /> East areas of the mine. <br /> - As part of this Technical Revision the bond calculation has been updated to show the actual <br /> liabilities. The current bond is approximately one million dollars and the updated bond calculation <br /> is approximately five-hundred thousand dollars. Figure 2 shows the areas related to the bond <br /> calculation table. <br /> 8308 COLORADO BLVD• STE 200• FIRESTONE, COLORADO 80504• PHONE: 303.833.1 41 6 <br />