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<br />In light of the foregoing, Colowyo reiterates and requests that WQCD amend the <br />permit Rationale language consistent with Colowyo's timely filed comments on the <br />draft Permit No. CO-0045161. <br />9. Please refer to the GENERAL COMMENTS section of the letter for a discussion of <br />the present and future operation of Colowyo's sediment control ponds. The CDMG <br />has copies of all of Colowyo's hydrological modeling and the CDMG is encouraged <br />to review each modeling effort. Colowyo would be pleased to review our pond <br />hydrology/sedimentology models with the CDMG. <br />10. Colowyo' s sediment control ponds aze currently designed and constructed to contain <br />the 10-yeaz, 24-hour precipitation event, and operated with manual headgates. <br />Manual dewatering of a sediment control pond is required to regain the necessary 10- <br />yeaz, 24-hour designed storm event. Numerous discussions regazding this topic took <br />place between the CDMG and Colowyo representatives. <br />Please refer to the GENERAL COMMENTS section of the letter for a discussion of <br />the present and future operation of Colowyo's sediment control ponds. The CDMG <br />has copies of all of Colowyo's hydrological modeling and the CDMG is encouraged <br />to review each modeling effort. Colowyo would be pleased to review our pond <br />hydrology/sedimentology models with the CDMG. <br />11. The example presented by the CDMG regazding five manually operated dischazges <br />occurring within one week and twenty-five manually operated dischazges occurring <br />during one month is unrealistic as Colowyo does not and has not operated the <br />sediment control ponds in this manner. <br />The comments made by CDMG regazding types of dischazges and measurement <br />frequencies is noted. It is Colowyo's intent to continue to comply with all existing <br />and future discharge permit conditions and requirements as set forth in Colowyo's <br />permits. <br />-END- <br />14 <br />