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Technical Revision <br />Boettcher Sand Stone Quarry <br />Permit No. M-1977 - 345 <br />Holcim respectfully submits a Technical Revision for the Boettcher Sandstone Quarry, <br />Permit No M-1977-345 <br />The property was permitted in 1977 and was quarried intermittently since then. The <br />quarry was never mined to the full extent and as a result it was partially reclaimed on <br />the south side. As the Fort Collins Plant was shut down in 2002, the operation at the <br />Boettcher Sand Stone Quarry had not resumed. Since then, Holcim tried to sell their <br />rights for the mineral and mining of the deposit, but was unsuccessful and has now <br />decided to conduct final reclamation at the site. <br />The technical revision is in regards to the reclamation concept. As the deposit was fully <br />mines, the reclamation concept in the existing permit cannot be completed as permitted. <br />Holcim (US) Inc. respectfully submits a new concept in which the area where there is a <br />a high wall — all loose and available material within the disturbed area will be pushed in <br />such a manner to reduce the exposed quarry wall in a manner to provide stability. It is <br />noted that there is insufficient loose material to complete a slope of 31-1: 1V and will <br />result in a steeper slope angle than anticipated. The concept is shown in the attached <br />drawing — Reclamation Concept — Boettcher Sand Stone Quarry. Once sloped the area <br />will be topsoiled (if available) and seeded. <br />It should also be noted that natural vegetation has taken place over the years in the <br />disturbed area and Holcim will take all care to minimize impact on what vegetation <br />exists. <br />The proposed seed mixture is aligned with the recommended seed mixture from <br />Larimer County for Area 11 — Foothills. <br />