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i <br />COLORADO DEPARTMENT OF HEALTH, Water Quality Comrof Disision <br />Addendum ro Rationale -Page 2. Permit No. COG500000 <br />a/ Daily Maximum ~ <br />h/ 36Day Arrrage/7-Dny Arprage <br />c/ bliuirmm~-Maximum <br />d/ Phosphorus monitoring rs required only for facilities x•hich dischnrge into the jollox•ing drainage basins: ('hem Creek <br />basin, Chatfield Reservoir downstream of the USGS gage nt Waterton and on Plum Creek, Dilon Reservoir basin (i. e., Ten <br />Mile Creek, Snake River, Blue River, aI! tributaries ro the Dilfnn Resen+oirJ, and Bear Creek basin. See rJie individual <br />Girt fication Rationale for a determination as ro x•herher monitoring is required. <br />b. Mineral mining and processing poim source category - 40 CfR 436 - subparts D (industrial sand; process- <br />genernted wastewater from facilities emplming HF flotation), 1: (gypsum), F (asphaltic minerall, G (asbestos <br />and x~oRartoniteJ, J (barite), K (/lttorsparJ, L (salines from brine lakes), M (borax), N (potash), O (sodium <br />sulfate), V (bemoniteJ, W (magnesite), X (diatomite), Y QadeJ, Z (novacu[ireJ, and AF (rripoli}; and asphalt <br />batch plants located at arry• facility othmvise entered by this genera! permit: <br />Limits -There shall be no descharge of process wastexater into store waers. Discharge shall consist of <br />stormwater only. ' <br />i <br />c. Miners( mining and processing poim source catigory - 40 CFR 436 - subpart D (industrial sardJ (except for <br />process-generated wastewater from facilities employing NF flotation): <br />Table 2 - Effluen! Limns <br />Parameter <br />Limit <br />Rationale <br />Flow, MCD Report <br />TSS, mg/1 25/45 <br />pN, s. u. 6.5-9.0 <br />OiI and Crense, mgA l0 <br />T. Dissolved Solids, mg/I Report <br />(Colo. River Basin only) <br />T. Phosphorus (as PJ, mg/l Report <br />a/ NA <br />b/ Best Practicable Technology <br />e/ Water Quality Srnndards <br />a/ State Effluent Regulations <br />a/ Salinity Regulations <br />a/d/ Best Professional Judgment <br />a/ Daily Maximum <br />b/ 30-Day As•erage/Daily Maximum <br />c/ Minimum-Maximum <br />d/ Phosphorus monitoring is required only for facilities x•hich duehnrge ima the following drainage 6atins: Cherry Creek <br />basin, Chatfield Reservoir downstream ojthe USGS gage a't Warman and on Plum Creek, Dillon Reservoir basin (i. e., Ten <br />Mile Creek, Snake River, Blue Riser, al! tributaries to the Dillon Reservoir!, and Bear Creek basin. See the individtta! <br />Certification Rationale for a determination as ro xherher m'anitoring is required. <br />Al! other permit requirements sltal! remain the same, including monitoring reguiremems <br />Page 6 of the permit have been amended; <br />PUBLIC NOTICE <br />page 6a has been added. <br />No changes were made ro the amendmem ar a result ojpu6lic noiice. <br />Kathryn Dolan <br />September 21, 1992 <br />Knthn•n Dolan <br />January 7, l993 <br />