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STATE OF COLO FfngO ~rt'r. ~:un U L~'d ~' r~••v •~•^•~ <br />DEPARTMENT OF NATURAL RESOURCES <br />D. Monte Pascoe, E><ecu live Dir ecter <br />Mr. [9illiam A. Bear <br />Bear Coal Company <br />Somerset, Colorado 81939 <br />David C. Shelton <br />Director <br />A7 IV ED LA1~' D R ECLAl1 A'I'ION <br />423 Centennial Building. 1313 Sherman Street <br />Denver, Colorado 80203 Tel. (303) 866-3567 <br />June 22, 1982 <br />Re: Bear Mine Permit Review <br />Our File No. C-033-81 <br />Dear P1r. Bear: <br />RECFIt/r ; <br />JUN ?4 f:., <br />fir~'d....-------• <br />The Division staff has re vietoed the stipulation responses submitted on June 4, <br />1982. A number of the responses were discussed briefly with Eldon Strid of <br />ACZ at that time: I indicated that some additional clarification and detail <br />would probably be required on certain responses, and those concerns are fully <br />addressed below. <br />Stipulation No. 1 <br />Two major concerns exist with respect to approving the sediment control system <br />as submitted in response to Stipulation No. 1. <br />First, very little detail is provided on the system of flocculant introduction. <br />The system should be automated and metered. The system should employ a mixing <br />chamber. The small filter dam basins could serve this purpose. Below are <br />listed those items the Division generally requests in evaluating the Llesign of <br />treatment systems which sear has not addressed: <br />I. Design and layout of treatment system <br />A. Idethod of treatment - batch or continuous <br />B. Type and dimensions of mixing chamber <br />C. Theoretical detention time of mixing <br />D. Theoretical detention time of pond <br />E. Expected range in temperature of wastewater <br />II. Coagulant Information <br />1 <br /> <br />A. Type of coagulant <br />1. Electrolyte <br />2. Polyelectrolyte <br />3. Bydrolized metal ion <br />4. Cationic or anionic <br />5. Physiochemistry of the flocculation mechanism <br />6. Solid or liquid <br />n <br />