HYDRO25490

• Permit No: C1980007
• IBM Index Class Name: Hydrology
• Doc Date: 4/17/1995
• Doc Name: CDPS permit
• Permit Index Doc Type: NPDES
• Media Type: D
• Archive: No

COLOR.4D0 DEPARTMENT OF PUBL/~ HEALTH AND ENVIRONMENT, Winer Qum„y Control Division
Rmionnlc - Pnge 11, Permit No. CO-0038776
eJ Anrideernrlmion: Since Sylvester Gulch is Use Protected, nn nnlidegrndntion review is not required fnr nuJnll
0/ l pursuant ro section 3. l.8(1 J(bJ of The Bn.cic Standards aur! Medrodoloeies (or Surface Water.
Fwvlrer, .rurce rlri.c perminirrg action n•ill ant result iu nn increase in any eJjluem courentrntinn limitation nr
effluent flew limimtimr, the receiring wmers nre nm "reviewable waters", pursuant to section 3.1.8(3J(nJ +f 77ie
Basic Stnndmrly nnrl Methodolaeiec fnr Sur(nce Wnrer, breed upon n firuling ojuo increaser! +vnrer q+mliry
impact.
f) Salinity Re.eulatimrs: In conrplinnce with the Re¢ulnrioru (or lnr~lemenmtion o(the Colorado Ricer Snlinin'
Standards Throunh the NPDES Perini! Proernrn, the penninee shall mm~iror for fain! dissoh~erl solids on n
quarterly bnris. Samples shall be token m the ef/lueru discharge point(s). Salinity requirements are inchuler/ in
Port 1, Section B.3 ojrhe permit.
The Division used the sampling dmn .rurnmm~ized in Tables V-/ through V-6 !o cnlndnte the torn! .rnlinilp
lnndirrg from dre facility. During rhi.c period, dre following nremr lnnrlings were enlculnrerl (in pnunrl.c per dnyJ:
Outfnlf 002 = 1285
Outfnl1004 = 943
Orrtfnll005 = 548
Outjnll 006 = 5.5
Outfall 007 = 46.8
Out(nlf 009 = 1006
TOTAL = 3834 (1.8 ron.c per dnyJ
Bn.red on this landing, this enriry's rotrd dischmge does nor nreer the regulmory [imitruion of n nur.iinurtn rjnne
!on per- day (or 350 ron.c per yenry. T7te pernrittee must submit n report/ that doaunent.c rvherlter it is fen.cible m
trem to these levels (.cee Pnr! LA. S. of the permit). The Snliniry Regulntimrs allow jar the waA•er ojTDS
lirnitatinrr.c upon .vrhrnirrnl nj n repot! thin rlemm~srrnres lhnr nchieverneru of zero .cn6 landing or, in the event
thin is not nchievnhle, di.cchnrge of lec.c than one nm per dm', is nor ecnnumicnlly fea.cib[e. Quanerh•
rmmiroring fro- rurn(rli.revrhrd .calirl.c nv(( continue regardless.
gJ W/mle EN7uent Tonicity (WETI Testing: Fm' nutfnllr 002, 004 mul 011, acute WET recring i.r requir<~r/. Fur
mufall 0/2, chronic WET resting is required. (See Pnrt.r LA nrrd LB of the pennir.J
IJ Purpose n(WET Tee~tirre: The Wnrer Qunliry Control Division hn.c esrnb6'~herl the u.ce aj WET re.cring.nc u
nrethorl fur ident fi'ing nod controlling tonic discharges from x'nsrewnter n'ennnen! facilities. WET le.ning Lc
being nri(ized ns n organs to err.cure rho! there nre no discmrges of pollumnts "in nmounec, concentrruiun.c
nr combinations which nre hnrnjul mthe beneficial uses ar roric to humm~.r, mrinmis, plnntc, or rrquntir
life" n.c required 6y Section 3.1. 1 / (1 J of the Bn.ric Strurrlards and Methadolneie.c fnr- Snrfnce Wntee+~.
2J In.cn~eam Wrr.cte Cnnremrminn (IWCI: Where mm~iroring or limiuuion.r jar WET nre deenrrvl nppruprinre by
the Divi.ciuu, chronic in.crrenm dilminn n.c repr'ecenrerl by the chronic !WC i.r critical in detrrnrinin,e whrnher
ercure nr c/v-nnic cundiriuns .ehnff apply. Fm' those di.cduu-gec ~•here the chronic (WC is greater than (> J
9. / `Ya, chronic rant/itiun.r apply, where the /WC is less rhrm ur equal ro (<J 9, /nerve cundi(iurr.c npph•.
The chronic /WC i.c determined using the folluu•irrg equminn:
/WC = /Fnrility Flmv (FFJ/(Stream Chrmrir Low Flor,~ (nnmralJ +FFJ/ X /00%
The flows and cor-respourlirrg /WC jar dre npprnpriare rli.cchnrge pain! ore:
Discharge Chronic Lorv F[orv, Facility Design Florv, IWC, (%a)
Point 30E3, (cfs) (cfs)
002 & 004* 4l 0.24 (cnnrbinerlJ 0.6
0/l 0 ** 100
0/2 0 ** 100
• Bemuse of the pr'm'imiry of These Mn dicchnrges, They nre hein,p enn.cidered ns a single
iurprrn ra the reed ving r.•arer'.
•• 7hesc ou Jnlls nonnm!!y du not disdmr'ge. Becmrue dm chronic (mr flm.:a nre ,ern.
n fa:ilirv flow is nor requu'ed ro determine the IIVC. n rail/ nh~n~s equal /IXl'k