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<br />7. COM, Inc. further notes that the estimated 5 to 10.7 gpm "capacity" required by the <br />DMG is not necessary to maintain a negative water balance at the site. According to a <br />February 27, 1996 letter from Allen Sorenson of the DMG, the Hazel A adit inflow <br />rate is estimated to be 1.69 gpm in the dry season and "1 or 2 gpm more" in the wet <br />season. The "design capacit}~' of the evaporation system should therefore be <br />approximately 2.69 to 3.69 gpm, plus a small safety factor to account for rainfall. <br />COM, Inc. concludes that an evaporation system capable of less than 4 gpm should be <br />adequate, instead of the 5 to 10.7 gpm required by the DMG. <br />8. Finally, COM Inc. would Gke to point out that the evaporation system does not need <br />to be operated continuously. If the system receives less than 4 gpm of water, and <br />evaporates 15 gpm, then it only needs to operate roughly 25% of the time, even in the <br />wet season. <br />REFERENCES: <br />December 18, 1995 letter from Richard Fox, P.E. to Mr. Allen Sorenson of the Colorado <br />Department of Natural Resources, Re: Hazel A Water Storage Capacity and Evaporation <br />for Modified Tailings Pond Permit No. M-94-117, COM Inc. <br />January 9, 19961etter from Richazd Fox, P.E. to Mr. Allen Sorenson of the Colorado <br />Department of Natural Resources, Re: Water Storage Capacity for Modified Tailings <br />Pond and Hazel A Permit No. M-94-117, COM Inc. <br />February 27, 1996 letter from Mr. Allen Sorenson of the Colorado Department of Natural <br />Resources to Mr. Richard Fanyo, Dufford and Brown, Re: Water Balance, Gold Hill Mill; <br />Colina Oro Molino (COM), Inc., Permit No. M-94-117. <br />March 17, 1996 letter from Richard Fob P.E. to Mr. Allen Sorenson of the Colorado <br />Department of Natural Resources, Re: Water Spray Evaporation Calculations and <br />Design, Gold Hill Mill, File No. M-94-117. <br />Mazch 18, 1996 letter from Mr. Alan Sorenson of the Colorado Department of Natural <br />Resources to Mr. Richard Fox, Re: Water Spray Evaporation System, Gold Hill Mill, <br />Colina Oro Molino, Inc., Permit No. M-94-117. <br />10/15/97 <br />