3000 SR 529 2016-01-01 MF Import

Pagc IS ol'41 Pcrmit No. N'A-003197-C, Modific�tian Datc: Ma�� I, 2007 Thc Pcrmiucc shall dctcrminc thc dcgrce of c�llucm and recciving ��•atcr mising ��hich occurs �� ithin the horizontal radius of thc acWc critcria dislancc mcasurcd from thc discharge port. "I he acute criteria dislance is de�ined as 10°'0 of the sum of 200 fect plus thc depth of waler at an cbbing tidc. The degrec of misinr shall be detcrmincd during critical condilions, as dctincd in WAC 173-201 A-020 Dcfinitions -"Crilical Condition." or as closc ro critical condilions as rcasonably possible. The critical condition sccnarios shall be establishcd in accordance ��ilh Gind�mce f�r Co�ichrc�ing ,11i.rin,ti� 7w�nr A�+alvsr.r (Lcolog�•. 19961. For critical condition sccnarios ot thc acutc hound�q, thc efllucnt 11o�e ratc to usc for anal}scs is Ihc highcsl dail�� maaimum Ilo�� for the past three }ears during the scason in ��hich critic;d condition (or as closc W cri�ical condition as reasonably possiblc) is likcly to occur. l�hc dilution ratio shall bc mcasurcd in thc flclJ ��ith dyc using stud�� protocols spccificd in thc Guidance, (Ecolog�, 1996. Appendis G.I. Section I.6) "Conducting a Dye Sludy," as �acll as othcr protocols listcd in suhpart C. Protocols (bclow).'�hc usc of mi�ing modcls is an acceptablc aiternati� e or adjunct to a dye siudy if the critical ambicnt conditions necessarv for moJel input are kno�en or ��ill be established with field studies. The Guirlancc mentioned abo�e shall be consulted �chen choosine the appmprialc modcl.'1'hc usc ofmodcls is also r.yuircd ifcriiical condition sccnarios that necd to be examincd are yuite diticrent from the �ci of condition� present during the d�e stud�-. Validation (and possibly calibraiion) o(a modcl may bc ncccssary and shall bc donc in accordancc with the Gnidanc�• mcntioned above, in particular. Appendic 6.1. Subscction L6.2, "Quaniill Dilution." 'I hc resultant dilution ratio for an acute boundan shall be applicd in accordancc �vi�h directions lound in Gcoloc)''s Pcrn+ir {i'ritrr's Alnnua! (199a. licolog)' Publicatio� �2-109, including addcnda through July 2002), in panicular, Chaptcr VI. I'hc Dcp:inmcnt c�pccts tiuu computcr modcling �vill bc nccessary to dctinc thc �ni�ing ��ithin thc zonc of aculc compliance, if onc is authorircd. 'I'hc misin� Jata �� ill bc applied to clllucnt daia to yuanti!j polluu�nt conccntrations within anA at thc edgc of thc mixing zonc. Rcnortine Rc<�ircmcnts If thc Pcrmittcc has inibmuuinn on Ihc background ph?sical conditions or hackground cunccntration of nc�mical substanccs (fur ��•hich ihcre arc crireria in Chaptcr I T-201 A WAC:) in thc rccci��ing watcr, this information shall Lc submiucJ ro thc Dcpartmcnt as part of thc BOlucnt �1i�ing Rcpon if thc Pcrmittcc conJucts a mising zonc anol�sis. l hc results of thc et7lucnt mixing study (if conducted) shall bc included in the I:ftlucnt Mising Rcport, which shali bc submiitcd to thc Dcpartmcnt f'or approval no latcr than April I, 2006. If thc Pcrniiucc conducts a mi�ing zonc analysis, � Plan of Snid�� lor thc mising rcport shall hc submiticd to ihc Dcpatlmcnt no latcr dian January 2, 2006.