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COLORADO DEPARTMENT OF HEALTH, Winer Quality Control Division <br />Rationale -Page 4. Pmnit No. COG500000 <br />V. TERMS AND COADJ770NS OF PERMIT <br />• harsh plants heated at any fariliry otherwise covrrcd by this genera! permit: <br />!'able VI-1 - EJJltteat I}mits <br />'ammeter <br />Ltmit <br />Rationale <br />law, MCA Report g/ NA <br />SS, mgR 30/45 b/ ~ State E,B7ttent Regulations <br />H, s. u. 6.5-9.0 F/ Water Quality Standmds <br />)il and Grease, mg/l 10 a/ Start Ejjltrent Regulations <br />brat Dusolvad Solids, mg/! Report g/ Salinity Regubsions <br />.:ob. River Basin only) <br />oral Phosphorus (as P), mg/l Rcporr a/~/ Bett Professional Judgment <br />Daily Mazimum <br />30-Day Avrrage/7--Day Average <br />Minimum-Mautnum <br />Phosphorus monitoring is rcquimd only for fariIitier which discharge into rlu following drainage basins: Cherry Crest basin, <br />Chatfield Reservoir dowrumam of the USGS gage at Waterton and on Plum Creek, Dii(on Reservoir basin (i.e., Ten Mik <br />Creek, Snake River, Blue River, all rributarier to the Dillon Reservoir), and Bear GYeek basin. Sue the individual <br />Certification Rationale for a detaminarion as to whaher monitoring is rcgdred <br />b. Mineral mining and proarting pout rousts category - 40 CFR 436 - subparer E {gypsum), F (asphaltic <br />mineral), G (asberros and x+ollastonireJ, J(barite), K (JluorsptvJ, L (salinesf+ar brine bleu), M <br />• (borax), N (potash), D (sodium sulfa![), V (bcrtronitt), W (magnesite), X (diatomite), P (jade), Z <br />(novnculite), and AF (tripop); atd asphalt batch plants heated ar any facility otJtawise covered by this <br />genera! permit: <br />I~rnUs - There shall be no discharge of proars wastewater into store waters. Dudtarge shall consist of <br />storntwarer only. <br />c. Mineral mining and proarsing pain soura category - 40 CFR 436 -subpart AL (graphite): Tau <br />disdtarge of proorsr wastewater from graphite mines is not coveted by this permit. (See Section V.A.2.d <br />of the Rationale.) <br />2. Discussion of Limitations: <br />a. Es:nptbns to Fuikml Lmltc• 71u 40 CFR 436 includes some ej/Iutnt limitations which arc not as stria <br />as those listed here.. Far esampk, the phosphate rook TSS limit is less stria, and for many ojthe <br />subiwtegorier which state 'rto dudiarge of proars wastewater,' an tsanption to that limit is provided <br />during mtain prrcipitatbn errors and in conjunction with ocher condUionr. However, this permit dots <br />rtof inclttcle these relaxed limier. This it a general permit, designed to cover the widest possible range of <br />facilities with similar wastewater charaaerirrica. In effectively achieving this broad coverage, the permit <br />mast also be relatively simple. Therrforc, some of the more individualistic or complex permit limitation <br />are not included in this permit <br />The Division doer not believe that !lure are a sufftciemly large number of such facilities in Colorado ro <br />warrant including the esanptions in this general permit. If a permitter wishes to take advantage ojthese <br />exemptions, the petniittue mast apply jot an individual permit. <br />• b. Iota! Suspended Solids (TSS): The previous permit included TSS limits based on the State Effluent <br />Regulations, 10.1.4, of 30 mg/l (30 day avenge) and 45 mg/! ~/ day average). However, the def~nitionr <br />of o 30 day average or 7 day average coiled jot 3 samples to be taken in a 30 day or 7 day period, <br />