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~,~. <br />~>m~ <br />~°'"~`~`• ECOSPHERE ENVIRONMENTAL SERVICES <br />~, <br />Frank J. Anesi <br />Attorney at Law <br />P.O. Box 2185 <br />Durango, Colorado 81302 <br />July 21, 2004 <br />RE: Threatened/Endangered Species Issues Related to the Sandco, Inc. Proposed Dalton <br />Pit, La Plata County, Colorado <br />Dear Mr. Anesi: <br />Please accept this letter clazifying consumptive use calculations I presented in my June 28s', <br />2004 communication with your office. Specifically, while calculating expected water depletions <br />in the Animas River from the proposed 44-acre pond site, I calculated the irrigated land <br />consumptive use based on the irrigation of approximately 15 acres of land. Based on a recent <br />conversation I had with David billion of Sandco (personal communication 7/20/04), I <br />underestimated the acreage of pastureland potentially irrigated on the property. While it is <br />correct that currently approximately 15-acres are under irrigation, the amount of acreage that can <br />effectively be irrigated is limited by drought conditions and a currently low azea water table. In <br />previous years, as much as the entire proposed pond site, 44-acres was under irrigation. <br />Accordingly, depending upon the elevation of the water table, the consumptive use of inrigated <br />land on the property ranges from 24.15-afy at 15-acres under irrigation to approximately 70.84- <br />afy when the entire pasture can be effectively irrigated. These consumptive use volumes were <br />derived utilizing the Blaney Griddle model that calculates the consumptive irrigation use of the <br />subject pastureland at approximately 1.61 acre-feet per yeaz per acreage. <br />Subtracting these volumes from the expected evaporative loss from the future pond site (97-afy) <br />provides a range of expected depletion between 72.85-afy 26.16-afy depending upon the amount <br />of under irrigation. <br />Please feel free to contact me if you have any questions. <br />Sincerely, <br />Mike Fitzgerald <br />Projects Manager <br />!08 N. BEHREND - SUITE A - FARMINGTON, NEW MEXICO 87401 (505) 327-2088 -FAX (505) 327-9546 <br />2257 MAIN AVENUE, PATIO LEVEL - DURANGO, COLORADO 81301 - (970) 382-7256 -FAX (970) 382-7259 <br />