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L~ <br /> <br />June 20, 1988 <br />Ms. Sandi Squire <br />Water Quality Control bivision <br />Monitoring and Enforcement Section <br />Colorado Dept. of Health <br />4210 East 11th Ave. <br />Denver, CO 80220 <br />Dear Sandi: <br />Subject: Colorado Uastewater Discharge Permit CO-0032115 <br />As reported to you by phone by our Mr. Bill Harding on June 17, 1988, Trapper <br />Mine measured a pH value which exceeds our permitted discharge value. The <br />elevated pH is at Johnson Gulch discharge point 001. <br />The source of the discharge is from groundwater and is not related to any <br />ground or surface water runoff passing through backfilled mining areas. <br />Trapper Mine is experiencing a very dry period. Natural groundwater flows <br />into our lower sediment control ponds are very low. As a result of the low <br />flows and high summertime temperatures, a significant growth of algae has <br />developed in several of the Johnson Gulch sediment control ponds. It is not <br />possible to prevent discharge since the present discharge from the system is <br />due to groundwater. We have installed a carbon dioxide bubbler to lower the <br />pH of 001 from 9.7 to 9.0 or less. However, we are only able to hold the pH <br />at around 9.5 pH and can't get below 9.0 pH. <br />We will continue with the pzesent course of treatment unless instructed by the <br />Division to use some other approved and agreed-to technique. <br />Please call if you have any questions. <br />Best regards, <br />~~~ <br />H. Bruce Humphries <br />Sr. Environmental Engineer ( ~~ll <br />HBH/jb [CDOH1) ~~~~N~~Y.~ <br />pc G.M. Stubblefield JUN 2 3 1988 <br />U.S. Emvironmental Protection Agency <br />Banta, C.~II.$D MINED LANG <br />File 109.2.7.3 RECLAMATION DIUI;^14N <br />imprisonment. <br />- lY. <br />G.M.Stubb efield <br />Vice President-Ope ations <br />I certify under penalty of law that I have personally examined and am familiar <br />with the information submitted in the correspondence and that, based on my <br />inquiry of those persons immediately responsible for obtaining the information <br />contained in the correspondence, I believe that the information is true, <br />accurate and complete. I am aware that there are significant penalties for <br />submitting false information, including the possibility of fine and <br />TR9PPBR 1RININ6 INC. ~ <br />P.0. Box 187 <br />Craig, Colorado 81626 <br />(303) 824-4401 <br />