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<br />4 <br />c <br />COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />Rationale - Page 2. Permit No. CO-0039560 <br />FACILITY DESCRIPTION:. <br />The facility is an underground coal mine and preparation plant. See the <br />previous Rationale, dated 1/7/83. The facility description from the previous <br />Rationale is still accurate, except for the following changes. A small volume <br />(0.3 cfs maximum) of minewater will be routed to the sedimentation pond, in <br />addition to the stormwater runoff. The pond is adquately sized to handle the <br />extra flow. Also, the pond has only one discharge point, 001, not two (as was <br />previously reported). <br />OPERATING HISTORY: <br />The permittee has reported several permit violations (which did not fall under <br />the precipitation exemptions): <br />Date Parameter Re ported Conc. Permit Limit Comments <br /> <br />3Q84 T. Iron, mg/1 4.77/10.0 3.5/7.0 - pond not functioning <br />4Q84 T. Iron, mg/1 3.55/10.0 3.5/7.0 properly; permittee <br /> cleaned out pond <br />2Q86 T. Settleable 0.7 0.5 - problems with test <br /> Solids, ml/1 procedure <br />3Q86 T. Settleable 3.0 0.5 - problems with pond <br /> Solids, ml/1 design; improvements made <br /> to pond. <br />No violations have been reported in the past year. No further problems are <br />anticipated at this time. <br />