2017-10-21_PERMIT FILE - M1983090

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October 16, 2017 Mr. Mark Johnson, Compliance Manager Bestway Concrete&Aggregates 301 Centennial Drive Milliken, Colorado 80543 Re: Stability Analysis Summary for the Existing La Poudre Gravel Mine(M -1983-090),updated October 161h,2017 Dear Mr. Johnson: This letter is being updated to address the Mined Land Reclamation Board (MLRB)Construction Materials Rule 6, Section 4, Subsection 19, Exhibit S-Permanent Man-Made Structures(6.4.19, Exhibit S)for the proposed the existing N. La Poudre Gravel Mine. The site is located north of the Cache La Poudre River, east of WCR 13 and south of Highway 392. The site is within Section 19, Township 6 North, Range 67 West of the 6th Principal Meridian. The project is located in Weld County, Colorado as show in the attached amendment figures. Per the Division of Reclamation, Mining and Safety(DRMS)when an amendment to an existing 2ffg2 is filed the applicant is required to discuss prior operations and mining limits with respect to surrounding structures located around the existing permit boundary and 200'from the"Affected Area". This letter describes the existing La Poudre Mine boundary and existing activities related to slope stability. Structure agreements have been mailed out to the following structure owners. The majority of these owners are more than 200'outside of the"Affected Area" • Overhead Power Line(Western& Eastern Boundary)(PVREA) • Drainage Easements(CDOT/Windsor) • Gas Line(Northern Boundary)(DCP) • Gas Line(Western&Northern Boundary)(XCEL) • Gas Facility(XCEL) • Telephone(West&North)(Century Link) • Pond (West of site)(United Water&Sanitation District) • Cable(West)(Comcast Link) • Cable(West)(Dark Com) • Residents(eastern boundary) (Osbome, McCosh, Brown) CURRENT MINING CONDITIONS Bestway Concrete&Aggregates has completed mining the original La Poudre mine, except for under the existing processing area. The"Wildlife Pond"on the west side of the Site is currently mined out. The slurry lined ponds on the east side of the site are mined out and filled with storage water. The slurry lined ponds are owned and operated by Central Colorado Water Conservancy District(Central). These ponds have been approved slurry lined ponds by the State Engineer's Office since 2011 and are 100% reclaimed. The ponds to the south have been mined out and