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COLO$AD~t DEPARIMEM Ot PUULlC tfE Rationale -Page 3. Permit No. COG-SOOaaa Y. TERMS AND CONDITIONS OF PERMIT A. Process Water Dsscharges 6om,o, v...._.. Numeric Limitations: Numeric limits will be applied jot some of the industrial categories covered by this permit. Then limits are from the EPA Federal Guidelines for the applicable point source category, as follows: a. Mineral mining andprocessingpointsoureecategory- 40 CFR 436-subpartB(crushedstone),C(constructionsanr and gravel), R (phosphate rock) -and all other industrial facilities covered under SIC Code I4, except those specifically Listed in paragraph b below, and concrete and asphalt batch plants located at any facility orherwis~ covered by this general permit: Table V-1-Effluent Limits Parameter Limit Rationale Flow, MGD Report a/ NA TSS, mg/1 30/95 b/ State Effluent Regulations pH, s. u. 6.5-9.0 d Water Quality Standards Oil and Grease, mg/1 /0 d/ State Effluent Regulations Total Dissolved Solids, mg/1 Report d/f/ Salinity Regulations Total Phosphorus (as P), mgA Report d/e/ Various Phosphorus Regulattons Mineral mining andprocessingpointsourcecategory-40 CFR 436-subpartAL(graphite): Thedirchargeojprocesswastewaterframgraphr= mines is not covered by this permit. (See Section Y.A.2.d of the Rationale.) b. Mineral mining and processingpointsourcecategory-40 CFR 436-subpartD(indusrrialsand)(ex~eptforproce~ generated wastewarerfrom facilities employing HFfloatarion): Table Y-2 -Effluent Limits Parameter Limit Rationale Flow, MGD Report a/ NA TSS, mg/1 25/45 b/ Best Practicable Technology pH, s. u. 6.5-9. D c/ Water Quality Standards Oi! and Grease, mg/l 10 d/ State Effluent Regulations Total Disso]ved Solids, mgA Report d/f/ Salinity Regulations Total Phosphorus (as P), mg/1 Report d/e/ t'arious Phosphorus Regulations a/ 30-Day Average/Daily Mnzimam d/ Daily Maxrmum b/ 30-Day`Average/7-Day Average e/ See 1!A.1.t. I c/ Minimum-Masimum j/ See Y.A.1.b. c. No process water discharge will be covered under this permit or authorized by certification for discharges with the mir mining and processing point source category of 90 CFR 436 - subparts E (gypsum), F (asphaltic mineral), G (asbestos wollastonite), J (barite), K (fluorspar), L (salines from brine lakes), M (borax), N (potash), O (sodium sulfati (bentonite), W (magnesite), X (diatomite), Y Fade), Z (novaculite), and AF (tripoli). 2. Discussion afLimitations: a. Exceptions to Federal Limits: The 40 CFR 436 includes some effluent limitations, which are not as strict as, those here. For example, the phosphate rock TSS limit is less strict, and for many ofthe subcategories, which state "no disc ofprocesr wastewater, "an exemption to that limit is provided during certain precipitation events and in conjunctioi othercondirions. However, this permit does not include these relaxed limiu. This is a general permit, designed ro cot widest possible range offacilities with similar wastewater characteristics. In efj-ectively achieving this broad covera~ permit must also be relatively simple. Therefore, some of the more individualistic or complex permit limitations a included in this permit. ^ The Division does not believe that there are a sufficiently large number ofsuch facilities in Colorado to warrant inc the exempnons in this general permit. Ifa permittee wishes to [ake advantage ofthese exemptions, the perminee mus for an individual permit.