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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />Addendum to Rationale -Page 2. Permit No. COG500000 <br />a/ Daily Maximum <br />b/ 30-Day Average/7-Day A~rrage <br />c/ Minimum-Maximum <br />d/ Phosphorus monitoring is required only for facilities which discharge into the following drainage basins: Cherry Creek <br />basin, Chatfield Reservoir downmeam ojthe USGS gage at Waterton and on PGun Creek, Dillon Reservoir basin (i. e., Ten <br />Mi4 Creek, Snake River, Blot River, all tributariv ro the Dillon Reren+oirJ, and Bear Creek basin. See the individual <br />Centcation Rationale jot a duermination ar to whttJrer monitoring is required <br />b. Mineral mining and proaccsing point roura mtegory - 40 CFR 436 - su6paru D industrial rand; procers- <br />generared wastewater from facilities employing IfF flotation), E (gypsum), F (asphaltic mineral), G (asbestos <br />and wollastoniteJ, J (barite), K (/luorsparJ, L (salines from brine lakes), M (borax), N (potash), O (sodium <br />sulfate), V (bentoniteJ, W (mogneriteJ, X (diatomite), Y (jade), Z (novaculiteJ, and AF (tripofiJ; and asphalt <br />batch plants located at any facility otherwise covered by this genera! permit: <br />Limits - Ihere shall be no discharge of process wastewater into state waters. Discharge shall consist of <br />stormwater only. <br />c. Mineral mining and processing point sourtt cntegary - 40 CFR 436 - subpart D rndrertrial sand) (except for <br />process-generated wastewater from facilities employing HFJlorationJ: <br />Table 2 - EJJluent Limits <br />Parameter Limit Rationale <br />Flow, MGD Repon a/ NA <br />TSS, mg/l 25/45 b/ But Practicable Technology <br />pH, s. u. QS-9.0 e/ Water Quality Standards <br />Oil and Grease, mg/! 70 a/ State EfJ'luem Regulations <br />T. Dissolved Solids, mg/1 Report a/ Salinity Regulations <br />(Colo. River Basin only) <br />T. Phosphoncr (as PJ, mgR Report a/d/ Bert Professional Judgment <br />n/ Daily Maximum <br />b/ 30-Day Average/Daily Maximum <br />c/ Minimum-Maximum <br />d/ Phosphorus monitoring is required only for jacilitiv whidr dirt>'rarge into the following drainage basins: Cherry Creek <br />basin, Chatfield Reservoir downmeam of the USGS gage at Waterton and on Plum Creek, Dillon Reservoir basin (;. e. , Ten <br />Mile Creek, Snake River, Blue River, all tributaries to the Dillon Reservoir), and Bear Creek basin. Sce the individual <br />Cert~cation Rationale for a determination as to whuher monitoring is required <br />All other permit requirtmenu shall remain tht same, including monitoring requiremems, <br />Page 6 of the permit have been amended; page 6a has been added. <br />Kathryn Dolan <br />September 21, 1992 <br />PUBLIC NOTICE <br />No changer were made ra the amendment as a result of public notice. <br />Kathryn Dolan <br />January 7, 1993 <br />