Laserfiche WebLink
COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT Water Quality Control Division <br />Rationale - Page 3. Permit No. COG-500000 <br />TERMS AND CONDITIONS OF PERMIT <br />A. Process Water Discharees <br />Numeric Limitations: Numeric limits will be applied far some of the industrial categories covered by this permit. These <br />limits are from the EPA Federal Guidelines for the applicable point source category, as follows: <br />Mineral mining and processing point source category - 40 CFR 436 -subpart B (crushed stone), C (construction sand <br />and gravel), R (phosphate rock) - and all other industrial facilities covered under SIC Code 14, except those <br />specifically listed in paragraph b below, and concrete and asphalt batch plants located at any facility otherwise <br />covered by this general permit: <br />Table V-1- Effluent Limits <br />Parameter Limit Rationale <br />Flow, MGD Report a/ NA <br />TSS, mg/1 30145 b/ State Effluent Regulations <br />pH, S.U. 6.5-9.0 c/ Water Quality Standards <br />Oil and Grease, mg/1 10 d/ State Effluent Regulations <br />Total Dissolved Solids, mg11 Report d/f/ Salinity Regulations <br />Total Phosphorus (as P), mg11 Report d/e/ Various Phosphorus Regulations <br /> <br />Mineral mining and processing point source category - 40 CFR 436 - subpart AL (graphite): The discharge of process wastewater from graphite <br />mines is not covered by this permit. (See Section V.A.2.d of the Rationale) <br />Mineral mining and processing point source category - 40 CFR 436- subpart D (industrial sand) (exceptforprocess- <br />generated wastewater from facilities employing HFfloatanon): <br />Table V-2 -- Effluent Limits <br />Parameter Limit Rationale <br />Flow, MGD Report p/ NA <br />7SS1 mg/7 25145 b/ Best Practicable Technology <br />pH, s. u. 6.5-9.0 c/ Water Quality Standards <br />Oil and Grease, mg/1 10 d/ State Effluent Regulations <br />Total Dissolved Solids, mg11 Report d/f/ Salinity Regulations <br />Total Phosphorus (as P), mg11 Report d/e/ Various Phosphorus Regulations <br />d 30-Day Average/Datly Maximum dl Daily Maximum <br />Y 30-Day Average/? Day Average W See V.AZ. c. <br />d Minimum-Maximum f See V.A.2b. <br />C. No process water discharge will be covered under this permit or authorized by certification for discharges with the mineral <br />mining and processing point source category of 40 CFR 436- subparts E (gypsum), F (asphaltic mineral), G (asbestos and <br />wollastonite), J (barite), K (fluorspar), L (salines from brine lakes), M (borax), N(potash), O (sodium sulfate), V (bentonite), <br />W (magnesite), X (diatomite), Y (jade), Z (novaculite), and AF (tripoli). <br />Discussion (Limitations: <br />a. Exceptions to Federal Limits: The 40 CFR 436 includes some effluent limitations, which are not as strict as, those listed <br />here. For example, the phosphate rock 7SS limit is less strict, and for many ofthe subcategories, which state "no discharge <br />of process wastewater, "an exemption to that limit is provided during certain precipitation events and in conjunction with <br />other conditions. However, this permit does not include these relaxed limits. This is a general permit, designed to cover the <br />widest possible range offacilities with similar wastewater characteristics. Ineffectively achieving this broad coverage, the <br />permit must also be relatively simple. Therefore, some of the more individualistic or complex permit limitations are not <br />included in this permit. <br />The Division does not believe that there are a sufficiently large number ofsuch facilities in Colorado to warrant including <br />the exemptions in this general permit. Ifa permittee wishes to take advantage of these exemptions, thepermittee must apply <br />for an individual permit.