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Technical Revision Boettcher Sand Stone Quarry Permit No. M-1977 - 345 Holcim respectfully submits a Technical Revision for the Boettcher Sandstone Quarry, Permit No M-1977-345 The property was permitted in 1977 and was quarried intermittently since then. The quarry was never mined to the full extent and as a result it was partially reclaimed on the south side. As the Fort Collins Plant was shut down in 2002, the operation at the Boettcher Sand Stone Quarry had not resumed. Since then, Holcim tried to sell their rights for the mineral and mining of the deposit, but was unsuccessful and has now decided to conduct final reclamation at the site. The technical revision is in regards to the reclamation concept. As the deposit was not fully mined, the reclamation concept in the existing permit cannot be completed as permitted. Holcim (US) Inc. respectfully submits a revised concept for the area where there is a high wall. All loose and available material within the disturbed area will be pushed in such a manner to reduce the exposed quarry wall and insure stability. • It should be noted that the existing highwall (1 H:1 V) has been exposed for at least 20 years without any degradation and is considered stable. • All work will be conducted within the permitted boundary and sloping of material will be done in such a manner to prevent erosion. • The plan will be to reduce the slope from the existing 1 H:1 V Slope to a 21-1:1 V slope utilizing existing loose material with the permit boundary. • Holcim seeks a variance from the 31-1:1 V to a 21-1:1 V slope. • Best Management Practices (BMP's) will be implemented to provide drainage away from the reclaimed area and to minimize any runoff on the newly disturbed area of reclamation in the form of silt fences, hay bales and drainage ditches. The concept is shown in the drawings below— Boettcher Sand Stone Quarry and Cross Section. Once sloped, the area will be topsoiled (if available) and seeded. Also, a fence (T-Post/ 3 strand barbed wire) will be installed along the crest line and posted with signs indicating "Danger— Highwall"