HYDRO24291

• Permit No: C1981044
• IBM Index Class Name: Hydrology
• Doc Name: MONITORING REQUIREMENTS
• Permit Index Doc Type: SEDIMENT POND INSPECTIONS
• Media Type: D
• Archive: No

COLORADO DEPARTMENT OF HEALTH, Water Quality Control Diri,cion
Rationale - Puge l?, Permit No. CO-0034/42
Table V/-4 -Federal
Parameter Lim/6~tions
30 Day Avg Concentration Daily Maa: Concentration
pH, .c. u. (minimum -maximum)
---6.0 - 9.0°-
Settleable Solids, m~/~7' N/A O.s
• Thi.c parumeter.cubjecr to Burden ojProojRequirements, see ne.rt.cection
Alternate Limitation Burden o(Proo(Reguiremen[s: /r, conformance wuh 40 CF,4 434.63, the pennutee hnr the
burden ojproojwhen requesting r'eliejfi~om .cetdenhle.colirlr limitarion.r. Relicf.citnll be grunted only when
necersnrp and .clmll no! be granted when Nte permittee has control over [he discharge. The permittee should
endeavor to meet the primnn~ lirnitntion.r whenever po.ccihle. This relieji.c available only jor,curfuce rmaffaarfnl/c
(004, 007, 009, 0/ l - 02I).
For rainfall. !o waive.cettleable.colidc lirnitulions, it is nececcnrv !o prove that discharge occurred within 4R houcc
after precipitation grenterlhun the l0-year, 24-hoar event has.clopped.
For snotvmell, to waive .cetdenble solids limimtlons, i( i.c necescar~• to prove that n'i.ccharge occurred within 4R )tours
after pond inflow volume greater then the /0-yew, 24-hour event ltnc stopper/.
The Division .shall determine d,e adequacy ojpraof. As port ojthis determination, the Division .chin! evaluate
whether the permittee could hove conn-o/led the di.cchurge in such n mannc r that primary limitations cotdd hm•e
been met. Al/ manual pond dewatering must meet .settleable solids /imitnrion.c.
c. Pollutants Limited by Water OualiN Standards: No potlu(ar,ts were limited by tenter quality stundurdc, with the
exception of pH for susf rce rmoJjdischnrges (ourfitlLc 004. 007. 009, 0/ 1 - 01 /J.
For outjuls 003. 011 and 024, for the parmneterc shown in Table V/-2, the rna.cs balance equation ,shown in V/.A.1
wn.c used to culadnte the allowable effluen! lbnimtions that x~ould not cnu.ce the wnlcr yunliN,cmndards to be
violated. These limi[ntion.c ore shown us the vnluec for M1 in Table vl-6. The vahtes for Q,. Qz and Q+ for cl+ronic
and acute limitations, token from section /l/.B.2. ojthi.c rationale, and used in the culculation.c for water quality
limited pnrnmeteec are shown in Table V/-s.
Table VI-5 --Acute and Chronic Flows lWilliams Fork River)
Flow Acute (/E3) Chronic (30E3)
Q, 42 cfc 4R cfc
Q, 6?a cfr 6?4 cfc
Q, 4R?a cfr sa.24 ~jr
The rotas jar Qt, the design capacity, i.c .specified n.r the combined mua~irnurn flou• fw outfn!lr 003, 022, and 024
The permittee has stored drat the mtal combined flow will not exceed 2800 gpm or 4.03 MGD (6.24 cfc).
Vnluec for h1/ and d1f vary depending on the bnekground stream yuuliry data (M, ~ and the applicable tenter yaaliry
standard (Mr). Values for Mr ore provided in Table ll/-3. h1r vnluec are slrown in Treble Vl-6 nlmtg with the
cnleulntcd effluent limitations (M~ for Outjnlls 003. 012, and 024.