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~FARGE <br />NORTH AIIAERICA <br />AGGREGATES, CONCRETE <br />& ASPHALT <br />f. General engineering plan stating how the material will be placed and stabilized in a <br />manner to avoid unacceptable settling and voids. <br />The source of the backfill material will be clean and inert materials such as overburden and/or <br />washed fines from nearby Howe, Tanabe and/or Hazeltine sand and gravel pits. The wash fines <br />aze silt that is a mix of sand, soil, and other fine material that can be used as a growth medium. It <br />is similaz to some of the sediment found at the bottom of the M&G Pit. <br />Any coazse fill will be delivered by Lafarge using trucks or scrapers that will dump into the <br />designated fill area. A dozer will be used to push and compact the material as it is delivered. Any <br />wash fines will be pumped or hauled to the site. Fill shall be generally free of organic materials, <br />rubbish, construction debris, or other deleterious materials. The fill material is relatively fine <br />and free of large chunks and it will be generally wet when delivered and placed. Similar methods <br />were used at the Demott Pitt at 80`s and Dahlia with no adverse settling observed, as reported by <br />Albert Frei and Sons' M&G Pit TR-5 Notice of Backfill Activity. Compaction shall be consistent <br />with that required under MLRB Regulation No. 3.1.5(2) for stability. When backfilling is <br />complete, we will spread approximately 4 inches of silt fines or topsoil as a growth medium on <br />the filled area to provide a seedbed for revegetation. <br />If you have any questions please call me at 303.657.4054. <br />Sincerely, <br />~- <br />Steven T. Brown, AICP <br />Land Planner <br />LAFARGE WEST, INC. <br />10170 Church Ranch Way, Westminster, CO 80021 <br />Office: (303) 6574000 Fax: (303) 657-4037 <br />