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COLORADO DEPARTMENT OF NEALTJI, Water Quality Comrol Division <br />Rariomile - Pnge 4, Permit No. COGSOOOW <br />V TERMS AND CONDITJONS OF PERMIT <br />bench plants loaned m any facility orherx~ise rovrred J!v this general permit: <br />Table VJ-1 -- EjJluent Limits <br />Parameter <br />Limit <br />Rmionale <br />Flow, MGD Report ~ a/ NA <br />TSS, mg/! 30/45 b/ Srnte EjJiuenr Rrgulmionc <br />pH, s. u. 6.5-9.0 e/ Winer Quality Starufnrds <br />Oi! muf Grease, mg/1 JO a/ State Effluem Regukuions <br />Total Dissolved Solids, mg/I Report a/ Salinity Regulations <br />/Colo. River Beuin Dote') <br />Torn/ Phosphorus (as PJ, mg/l Report ~, a/d/ Besr Professional Judgme <br />a/ Daily Maximum <br />b/ 34Dav Average/7-Day Average <br />_c/ Minimum-Maximum I <br />d/ Phosphorus monitoring is required Doty for facilities x•hich dvcs'wrge imo the follox•ing drainage basins.• Cherry Creek basin, <br />Chatfield Reservoir dox•nstream ojrhe USGS gage at R'atcrion and on Plum Creek, Dillon Resennir basin (i. e., Ten Mile <br />Creek, Snake River, Blue River, al! tributaries to the Dilbn ResennirJ, and Bear Creek basin. See the individual <br />Cert~cation Rationale jot a determination as to x•herher monitoring is required. <br />i <br />b. Mineral mining and pronssing poim s torte category - 40 CFR 436 -subparts F_ (gypsum), F (asphaltic <br />mineral), G (asbesms and wollasronirrJ~, J (barite), K (JluorsparJ, L (salines from briar lakes), M <br />(borax), N (potash), O (sodium suljmeJ~ V (bemoniteJ, W (magnesiteJ, X (diatomite), S' ~'ndeJ, Z <br />(novnculiteJ, and AF (tnpoliJ; and aspHah batch plains located at any jaciliq• otherwise covered by this <br />genera! permit. <br />Limits - 73rere shall be no discharge ojprocess x•asrexater into state x~aters. Discharge steal! consist aj <br />stormx•ater only. <br />c. Mineral mining and processing point sriurce cmegory - 40 CFR 436 - subpart AL (graphite): The <br />discharge ojpraeess x•astex•ater from graphite minesu not covered by this permit. (See Section V.A.2.d <br />i <br />of the Rationale./ I <br />2. Discussion of Lintitntiont: <br />a. F_rcepJions !o Ferftml Limits: 71re 40 •CFR 436 includes some effluent limimtions which are not as strict <br />ac those fisted here. For exrunple, stet phn.cphme rock TSS limit i,r fess strict, acrd jar mono of the <br />subcategories which state 'no di.rchnrge of process x•nsrex•arer,' an exemption w that limit is provided <br />during certain predpitmion corms and tin ronjunaion with orhn rondirions. However, this permit does <br />not include these relaxed limits. This is a general permit, designed to coin the widest possible range of <br />jtrilitier with simiMr x•artexmer chnraberi.rtiet. /n rffectively achieving this brood rovernge, the permit <br />must also be relatively simple. 7lmrefa~re, some of the more individualistic or romplax permit limitations <br />are oat included in this permit. <br />I <br />73re Division dons oar helievr that there are a sufficiently large number ojsuch facilities in Colorado ro <br />i <br />warrant including the exemptions in this general permit. Ija permitree x•irhes ro rake advantage ojthese <br />exemptions, the pemrirtee must apply for an individualpenniJ. - <br />b. Total Suspended Solids (TSS): 71te pr~ennut permit included TSS limits 6aced on the Stare EjJluent <br />Regulations, /0.1.4, of 30 mg/! (30 dai• averagrJ and 45 mg/! (7 day average). Hox•ever, the definitior~r <br />of a 30 day average or 7 day average tolled for 3 sarnp(ec ro be taFen in a 30 day or 7 dnv period, <br />