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RE: Adequacy Review -Lohmann Sand and Gravel Mine, M-20017 Faye 2 Inert Material is defined as non-water-soluble and non-decomposable inert solids together with such minor amounts and types of other materials as will not significantly affect the inert nature of such solids according to the rules and regulations of the [Hazardous Waste] Commission. The term includes but is not limited to earth, sand, gravel, rock, concrete which has been in a hardened state for at least sixty days, masonry, asphalt paving fragments, and other non-water-soluble and non-decomposable inert solids including those the Commission may by regulation identify. We will inspect every load of imported inert fill and reject any loads containing any unacceptable materials (i.e. any material not defined above as inert materials, and including steel, plastic, cardboard, organic materials, etc.). All loads will be inspected before placement as backfill to prevent burial of any unacceptable material. (d) Approximate dates of backfill activity -Mining will begin in Area A and proceed north through the site. After we have mined the sand and gravel reserves from that section, we will begin to backfill the area. The backfilling activity will probably not begin until late 2002, and will continue until Area A is completely backfilled. The time span is heavily dependent on market conditions. (e) Post mining configuration, and how it is compatible with approved post mining use - The backfilled section, as mentioned above, will be Area A (see Exhibit C3), which will be mined for the sand and gravel reserves, then backfilled with imported inert fill materials and excess native overburden. We will backfill the area close to the original grade, and then finish the grading with native topsoil. The post-mining configuration of the section will be at the original grade, and the area will be revegetated as noted in the application. The post-mining configuration of the backfilled area is compatible with the post-mining use as rangeland. As is stated in the original application, a small portion of the mined area (Area A) will be backfilled and reclaimed as rangeland, while the rest of the mined area (Areas B and C) will be reclaimed as water storage and wildlife habitat. The landowner will be able to continue to use his land for the residential and agricultural uses for which property is currently being used. (f) General engineering plan of how the material will be placed and stabilized to avoid any unacceptable settling and voids -The imported inert material and native material used for backfill will be compacted with heavy mobile equipment including front-end loaders, backhoes, dozers, and scrapers. The fill material shall be compacted in continuous, horizontal layers to avoid any unacceptable settling and voids. Item 3 -Temporary Substitute Supply Plan A Temporary Substitute Supply Plan for the Lohmann Sand and Gravel Mine was submitted to the Colorado Office of the State Engineer on (or around) March 15, 2001, for approval. Letters were sent out April 25, 2001, to Water Well Owners within 600 feet, as requested by the State Engineer's Office. (If you would like copies of these documents, we would be happy to forward copies to you.) We will send the SEO's approval letter to the DMG as soon as it is received. L.G. Everist, Inc./Andesite Rock Company commits to exposing no groundwater nor utilizing any groundwater for consumptive uses until we have provided the Division of Minerals and Geology with evidence that we are in compliance with the Office of the State Engineer's requirements regarding groundwater use. LM/LOH-adgreview-dmggs-060801 -via Hand Delivery