HYDRO21916

• Permit No: C1980007
• IBM Index Class Name: Hydrology
• Doc Date: 3/6/1995
• Doc Name: CDPS permit
• Permit Index Doc Type: NPDES
• Media Type: D
• Archive: No

COLORADO DEPARTMENT OF PUBLIC FIEALTH AND ENVIRONMENT, Wmer Qunliry Control Diri.cion
Rnrinnnle - Pnge 11, Permit No. CO-00387r6
eJ Aruideerndmion: Since Syivesrer Gulch is Use Protected, nn nntidegrrulntion reriek• is nor required for nmjnll
011 pursuant m section 3.1.8(1)(6) of The Basic Srnrrdnrds nod Methadaloeies for Surface Wnrrr.
Further, since this permitting action will not result in an increase in any e,[j7ueru concentrnliou limirmimr nr
efjluenrflow (imitation, the receiving wnrers ere not "reviewable wnrers", pursuant m section .i.1.8(3J(nJ oj7lrr
Basic Stnndard.c and Methcdoloeies for Surface Wmer, based upon a finding of no increnserl w.vter qunlirn
impact.
f) Salinity Reeulntions: !n rnmpliance with the Reeulatians for lmolemerrtntion of the Colorado Rir•er Snlitlin~
Srnrulnrdc 7hroueh the NPDES Permit Proernm, the permittee shall monitor for total dissolved solids on n
quarterly bests. Samples shall be token at the ejjluerrt discharge point(s). Snlirriry requiretnenl.s ere included in
Parr 1, Section B.3 of the permit.
The Division used the sampling dma summarized in Tables V-/ through V-6 fo calculate the mrnl snGnin~
loading from the fncifity. L>using this period, the following menu loadings were calculmed (in pouorls per rlnvJ:
Ou jell 002 = 1285
Outjnl1004 = 943
Outfnll005 = 548
Ourfall 006 = 5.5
Outjn11007 = 46.8
Outfnll009 = 1006
TOTAL = 3834 (].8 tons per day)
B2ced on this landing, this ,°rrtiN's total discharge does not meet the regulatory linritariolr of n Inrecirrrlltrr njorle
ton per day (or 350 cons pe.~ year). The permtttee mus[ submit a report that docwnents t;•hether it is jeaxible m
treat to these levels (see Pmt /. A. S. of the permit). The Saliniry Regulnriotls allow for the waiver of TOS
limitntions upon subminnl of n report that demonstrates that nchievenlem oj¢ero soh loading nr, in du' erenr
that is nor achievable, discharge of less rhnn one ten per day, is not economicnlh~ jen.cihle. Qunrrerh~
nrotriroring far torn[ discolvrrl solids N~iR cwuinue regardless. _
gJ Whole ERlue»t Tonicity (WE'TI Testine: For outfnlLs 002, 004 artd 011, acute WET testing is required. Fnr
outfal! 012, chronic WET testing is required. (See Pans I.A and !.B of the perntit.J
/J Puroose of WET Testing: The Water Quality Control Division has established the use of WET testing rr.c n
method for identifying and controlling tonic discharges from wastewater treatment facilities. WET reslirrg i.c
being utilized ns n memrc ro ensure that there are no discharges of pollutnnrs "in nntounrc, roncetnrnNorr.c
or com6irrntiotrs which Itre harmful to the beneficial uses or lazic to humntrs, ntrimnls, plntlt.c, or ngrlnric
life" ns required by Sec,•ion 3.1.11 (1J of the Brtcic Stnndnrds and Methodoloeier far Surface Wetter.
2J Gr.ctrenm Wsure Cnnceurr«tion (/WC).• Where monitoring or limitntions for WET ere deemed nppraprinrr by
the Division, chronic in.c(renm dilution as represented by the chronic /WC is critical in determinul,q n•hedter
ncure or chronic condirioac shell apply. For those discharges where the chronic fWC is greeter rhnn (> )
9.1 %, chronic condiriouc apply, where the /WC is less rhnn or equal to (<J 9.1 ncure cn«ditinn.c «pplr.
The chronic /WC is derermitted using the following equation:
1WC = /Facility Flow (FF)/(Stream Chronic Low Flow (mmunlJ + FFJ/ X 100'k
The flows mrd corresponding IWCjor the nppropriare discharge palm are:
Discharge Chronic Low Flow, Facility Design Flow, IWC, (5'0)
Point 30.E3, (tfs) (cjs)
002 & 004* 4/ 0.24 (cornbinedJ 0.6
Oll 0 ** 100
012 0 ** 100
• Becattsr of tht pro.rintity of there two discharges, thry art bring contidrrrd as o single
impart to lh[ rtCLivlnB h'altr.
•• ntrsr oulfalLs normally do nol dircharRr- Brcatur the rhranic (ow flows err ;ero.
a facility flow it eat rrquirrd m detrnnine the /WC. 0 e~ill always equal /00X,