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July 20, 1987 <br /> Mid-Continent Resources, Inc. RIECLrIVED <br /> P.O. Box 500 <br /> Carbondale, CO 81623 JUL 23 1987 <br /> Ms. Candace Thompson liECLAIM1�INED LAND <br /> Hydrologist ATfpN DIVISION <br /> Mined Land Reclamation <br /> Denver, CO 80203 <br /> Re: Minor Revision, Rock Tunnel , Pond A <br /> Dear Candace, <br /> Enclosed you will find a design and as-built drawing of <br /> the existing discharge structures for Pond "A" at the rock <br /> tunnel . Since the permit application seems to be unclear <br /> concerning this pond, Mid-Continent is hereby requesting a <br /> Minor Revision to Permit C-81-017 in order to clarify what <br /> structures actually exist at this pond. <br /> As you will note on the enclosed drawing, a 6" <br /> principal spillway was installed with a 36" diameter <br /> emergency spillway. In Volume 3, App. II-B-7 Att. 4, page <br /> 32 of Mid-Contintent Permit Application, I showed that the <br /> existing emergency spillway would adequately handle a 25 <br /> year - 24 hour precipitation event plus the maximum mine <br /> effluent running into this pond. <br /> This design/as-built drawing should be inserted into <br /> Volume 3, App. II-B-7 Att. 4 as page 1B. If you have any <br /> questions concerning this minor revision, please feel free <br /> to contact me at the mine. <br /> Sincerely, <br /> Scott ones, F.E. <br /> Environmental Engineer <br /> cc: Doug Bowman <br />