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~~ <br />nr,~ ,~ ~ ~ III IIIIIIIIIIIII III <br />37 E. Colorado Avenue ~ •` ~ <br />Denver, CO 80210 <br />~,_, , <br />(303) 722-9067 _ ~_~ , ~ ~~ - <br />al Services • Botanical Studies • Photography ~ ~° -- - <br />July 11, 1989 ~~C~~~~~ <br />Daniel Hernandez HAND DELIVERED JUL 1t 1989 <br />Mined Land Reclamation MINED LAND <br />215 Centennial Bldg. RECLAMATION DIVISION <br />1313 Sherman St. EXHIBIT # <br />Denver, CO 80203 <br />RE: Computerized tree planting model for Snyder Quarry <br />Amendment. <br />Your File NO.: M-77-210 <br />Dear Mr. Hernandez: <br />Enclosed is a copy of the computerized model of the <br />environmental and numerical relationships of the vegetation, <br />soil water conditions, and planting scheme for tree planting <br />at the Snyder Quarry Amendment area. This plan is submitted <br />on behalf of Castle Concrete Company. <br />Please note that the modeling of the conditions indicates <br />that a planting of 40 to 50 trees per acre, based upon a <br />uniform planting over the entire area, will create a final <br />cover of about SOq and density of 80 to 100 trees per acre <br />on those areas of the benches where it would be appropriate <br />to plant trees. We utilized a minimum growth medium depth <br />for tree planting of 30 inches. Furthermore, i[ appears <br />from this computer model that the plant growth medium should <br />be capable of supporting both a healthy tree growth and <br />adequate grass and shrub density to protect the land from <br />erosion. <br />At the end of the narrative we have also proposed a <br />definition of tree establishment to be included in the <br />permit as the requirements far bond release. <br />If you have any questions please call. <br />Respectfully, <br />Mark A. Heffner <br />ENCL.: Tree planting model narrative and printouts. <br />cc: Gordon Morgan, Castle Concrete Company <br />G. Scott Briggs, Counsel for Castle Concrete Company <br />