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COLORADO DEPARTMENT OF fIF.1LTN, Water Quality Control Division <br />Addendum to Rationale -Page 2. Permit No. COG-SOID000 <br />a/ Daily Maximum <br />b/ 3aDay Average/7--Day As+crage <br />Minimum-Maximum <br />Phosphorus monitoring is regrrind only for facilUies whidi discharge into t)u following drainage basins: Chtrry Creek <br />basin, Chatfield Reservoir downrtmm~ of the USGS gage at Waterton and on Plum Creek, Dillon Reservoir basin (i.e., Ten <br />Mik Creek, Snake River, Blue River, all tributaries to the Dillon Rtserrnir), and Bear Creek basin. See the individual <br />Certification Rationale for a detemdnation as to whaher monitoring k rrquirrd <br />b. Mineral mining and procnrsing point sorvoe category - 40 CFR 436 - subparts D industrial sand,• procrss- <br />generated wastewater from fadliries employing HF flotatioKJ. E (gypsrun), F (asphaltic mineral), G (asbestos <br />and wo!lastoniteJ, J (barite), R (jiuorslrarJ, L (salirres from brine lakes), M (borax), N (potarhJ, O (sodium <br />sulfate), V (bentoniteJ, W (magnetite), % (diatomite), Y ('lade), Z (twvaevliteJ, and AF (tripoliJ; and asphalt <br />batch plane loaoted at amy facility othenvtse wtrrrd by this general permit <br />Lhnlts -Then shall be no d6altarge of proaexs wastewater into stare waters. Disc>yargc shall mnsist of <br />stormwater only. <br />a Mineral mining and procuring point source category - 40 CFR 436 - subpart D (ndurrrial sand) (excrpt jot <br />prorxss-generated wastewater from fadlitly employing HFflotation): <br />Table 1 - lfJlrunt Limitt <br />Parameter <br />Limit <br />Rationale <br />Flow, MGD Report p/ NA <br />~m8n 25/45 b/ Best Practicable Technology <br />u- QS-9.0 £/ Warts Quality Standards <br />.... and Grease, mg/l ]0 a/ State Effluent Regulations <br />T. Dissolurd Solids, mgR Report a/ Salinity Regulations <br />(Cob. River Basin only) <br />T. Phosphorus (as PJ, mg/1 Report a/d/ Best Professional Judgment <br />a/ Daily Maximum <br />b/ 30-Day Avcrage/Daily MaximJtm <br />c/ Minimum-Maximum <br />e/ Phosphorus monitoring is required only for faciGtiet which dirdmge into the following drainage basins: Cherry Creek <br />basin, Chatfield Raersnir downrtrearn of the USGS gage at Waterton and on Plum Creek, Dilbn Reservoir basin (i.e., Ten <br />Mik Creek, Snake Rifler, Blue Rifler, all tributaries to the Dillon Resa>,oir), ttrtd Bear Creek basin. See the individual <br />Certhcarion Rationale for a daamination as ro whether monitoring is required <br />All other permit requirements shall ranain the same, including monitoring rcquircments. <br />Page 6 of the permit have been amended,• page tSa has been added <br />Xathryn Dolan <br />September 21, 1992 <br />PUBLIC NOTICE <br />!anger were made to the amendmem as a resuk of public notice. <br />Kathryn Dolan <br />January 7, 1993 <br />