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Febtuary 27, 1998 WQCD Letter Page 5 Colowyo further commented that dewatering in accordance with "applicable state laws" means dewatering solely in accordance with the WQCD permit. We at this point disagree with Colowyo, in that we believe ponds designed to contain (rather than pass) water for a period of time prior to discharge may be subject to review by the Division of Water Resources with regard to evaporative augmentation and temporary substitute supply matters. We will, however, consult further with the Colorado Division of Water Resources to help us resolve this issue. 10. DMG commented that we would appreciate being informed of any future modification to the WQCD permit. Colowyo did not object to this. WQCD did not comment. We would still like to know if it would be possible for WQCD to inform us of any future modifications to Colowyo's WQCD permit. l 1. No further comment from WQCD to DMG is necessary. Thank you. l2. No further comment from WQCD to DMG is necessary. Thank you. 13. No further comment from WQCD to DMG is necessary. Thank you. 14. No further comment from WQCD to DMG is necessary. Thank you. 15. No further comment from WQCD to DMG is necessary. Thank you. B.1. Summary of Rationale Since transmitting our January 9, 1998 letter to WQCD, we have become awaze of why language in the draft WQCD permit reflects both automatic and manual discharges. In light of Colowyo's comments pertaining to this issue in [heir February 5, 19981etter, we wish to reiterate that all ten of Colowyo's ponds have manual dischazge capability, all have emergency spillways designed to pass the 25-yeaz, 24- hourevent without compromising the integrity of the ponds, and nine of the ten have vertical riser pipes (automatic dewatering spillways). Colowyo has submitted a technical revision to their DMG permit to revise some of their pond designs. 2. In our comments earlier in this memo (Item A.8.), we suggested that the WQCD permit require each manual discharge to be sampled for compliance. We believe this would support the first paragraph on page 10 of the Summary of Rationale that reads "Any manual dewatering of ponds that are equipped with automatic dewatering systems must meet TSS and total iron limitations". As mentioned earlier, WQCD responded by status that it would evaluate our request. We would appreciate being informed of WQCD's decision.