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COLORADO DEPARTMENT OF HEALTH, W Quality Control Division • Rationale -Page 5. Permit No. COGS00000 V. TERMS AND CONDI71ONS OF PERMIT respectis+ely, in order to determine romplianre with the limiu. Since the 7SS monitoring frequency is momhly, a 7SS limit of 60 mgR was added so that romplianre rould be determined blued on one sample. The Division has amended the definitions fora 30 day ai+crage or 7 day as+erage, to to dderntined by the arithmetic mean of aU samples rollected during a 30 day or 7 day period. Therefore, the need for a daily maximum 7SS limit has been eliminated, and so is not included in this renewal /urmit. The other 7SS limits shall remain the same, for the applicnbk categories. c. Phosphorus: The previous permit included Phosphorus (P) monitoring jor the Dillon Reserwir drainage area only. This has been changed to also include Cherry Creek basin, Bear Creek bcrrin and those state water tributary to Cluufre/d Restrwir downstream of the USGS gage at Waterton an+f on Plain Creek These segments all have or will have P limits on discharges. In general, the types of facilities rotrred under thrs permit are not tspected to halve problems with P,• hawesrr, monitoring will be required on a quarterly basis for all process water disdtarger to there basins. Ijthe data indicate any potemial problems with P kNrls at a specific facility, then an individual permit with P limits nary be required far that facility. d. Graphite: In the case of graphite mining, the federal ejjluem guidelines (40 CFR 436.382) call jor a limit for Total /ton. Since the Division has Water Quality Standards in many areas of the state which may be stricter than the jedera/ limits, roi+erage ojproress water discharges from this type of facility must be under an individual permit. B. Storntwater Diseharres Stormwatn vs. Process water When stormwatn mixes with proress warn, the process water limitations (Part LB ojtht perntrlJ apply to the discharge of that mixed water. The stormwatn section (Part I.C of the ptrmitJ is imendea to rove those portions of a nonmetallic minerals production opnation (eaerpt fue1J that are not already subject ro e$Iuem limitations under 40 CFR 436, and to roNCr stormwatn runofffrom asphalt and ronoete batch plants. 2. Stormwatn Ma~ement Plan (SWMPI The stormwatn regulations primarily apply to areas not rotirred by 40 CFR Part 436. They require permitrees to develop and impkmem a Stormwatn Managemem Plan (SWMP) to protect the quality of stormwatn leaving the site. The plan shall idemify potemia! sowres of pollution (including sedimem) which may reasonably be expected to affect the quality of stormwatn discharges associated with mining activity. In addition, the plan shall describe the best managemem practices (BMPsJ which will be used to reduce the polluams in stormwatn discharger from the mining site. Some activities required under the SWMP may already be in place. Howevn, the SWMP will require the pevmittee to roordinate these activities with any necessary new activities in an ordnly mamas, so that the result is the reduction or elimination of pollutams reaching state waters from areas not limited by efjluem limitations. Facilities must implement the provisions ojthe SWMP rcgtttrcd under this pevt as a eortdition of this pcrmit. It is the permittee's responsibility to notes the Colorado Division of Mining and Geobgy (lormnly the Colorado Mined Land Reclanarion Division) of arty sign~cam changes at their site resulting from the implememation of the SWMP. This is so that the Division of Mining and Geology may review the SWMP and incorporate any potential revisions iruo the facility's reclamation permit which might 6e needed. 7ht SWMP shall include the following items, at a minimum: