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37 E. Colorado Avenue <br />Denver, CO 80210 <br />(303) 722-9067 <br />Environmental Services ~ Botanical Studies ~ Photography <br />~II ~II~II~I~IIII~I~ <br />October 4, ass <br />~_,. <br />~ [L . ~~ i -_. ~ J .. ... i <br />Dan Hernandez <br />Mined Land Reclamation OC T 0 5 1990 <br />215 Csntennisl Bldg. <br />1313 Sherman st iVlined Land <br />Denver, co Bozo3 Reclamation Division <br />RE: R~3sponse to adequacy letter of October 3, 1990. Broderick & <br />Gibboiza, State Pit, Pueblo County. <br />Your :?ile No.: M-90-112. <br />Dear ])an: <br />Thank you for your letter on Broderick & Gibbons' State Pit application. <br />Following are the responses to your four items and questions regarding <br />this cpplication. The responses follow a format of paraphrasing each of <br />your items followed by the response. <br />Item 1: Concerns regarding the disturbed acreage and bonding of the <br />operation, with a request for redescription of the disturbance pattern <br />in accordance with the Major/Moderate/Minor method of delineation. <br />RESPOb'SE: First, please recognize the 755 acres of affected land is not <br />defined in terms of areas that will be mined. The affected land <br />boundary includes mining areas, the initial plant Bite which does not <br />contain gravel, and a buffer area beyond the limits of the actual <br />deposit. The actual limp of mining is within the Cascajo soil type. <br />Although the Cascajo soil is derived from the gravel deposit, its extent <br />is actually somewhat greater than the extent of the gravel. Thie is due <br />to erosion carrying gravels down slope from the gravel outcrop producing <br />a thin veneer of gravelly soil in places where no mineable gravel <br />exists. <br />You calculated the amount of land to be mined per year by dividing <br />the affected land by the estimated life of the mine. Broderick & <br />Gibbons believe this value should be calculated by dividing the <br />estimated average annual production by the potential production of an <br />acre of gravel. <br />