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 DEPARTkfENT OF HEALTH. Water Quu/iry Control Division
Rationale - Pnge l3, Permit No. CO-0034/42
Table V/-6 -- Summary ofMass Balance Calculations (out(alls 003, 022 and 014)
Parameter Stream Standard, (M3), Effluent Conaentration, (M2J,
AculdChronic AcutdChronic
Arsenic (T), pg/u 50% 373/-
Cndmiunr (PO), NS/~ ?5.75/1.31 /99//9
Copper (PDJ, pg/~ 39.51/24.45 305/2/3
Iron (TRJ, pg/~ -/1000 -/1000•
Iron (PD), pg/i7 -/300 -/300'
Lead (PD), pg/~7 378.29/12.98 Z92d///3
Manganese (TR), pg/~ _/1000 -/R153
Manganese IPD), pg/0 -/50 -/434
hlercury (T), pg/~7 -/0.0/ -/0.09
Nickel (PD). pg/~7 1765.24/182.37 136x7/1585
Silver (PD), pg/u 8.79/1.33 68/12
Zinc (PD), pg/~ 240.49/217.83 /859//893
T= Total. PD= Patentinlly Di.rcalved. TR=Total Recavernhlejrnction.c
' Because the ambient concentration is greater than the WQ.rtandurd, the lirnitatian equals the.rtnndnrd.
To[ul Residual Chlorine lout(u(l 0231: Water quu(iN-bused e(f<uen[ limitations fur to(nl residual cldorine, were
calculated rat outfnll 023 bused upon n design capacity oj0.0/2 MGD (0.0/9 cftJ. A![lrough the previous permit
rationale irtdica[ed that the wastewater Jloty will increase ro 0.022 MGD within S to 10 cearr, t{+e reported flow
vulaes in Table V-l indicule that the efJluemflow.r /rave not exceeded 0.0/2 MGD. Therefore, effluent lirnitntimr.t'
will he calculnter/rat om[jnll 013 braced on n marimurn flow oj0.012 MGD. Since tiro discharge conci.rts a(domestic
x'nctewwter. no odnrr pollutuntc except pH, are expected ro be present in dre dlrerinrge. The enlculaled effluent
limilalion for tom/ residual chlorine is greater than that allowed by the State Regvlnkon.c for Effluent Lirnitntion.r.
Therefore the limit oj0.5 mg/~ (daily maximum) speclfred in the Regulotions shn// apply.
Toml Ammonia /out(nll 023): Forlorn/ ammonia, the default maximum allowable in.rlr'earn concenlrntion.r listed in
.reckon 111.,4.3. were used in con.riderntion ojthe need jar tan! ammonia limitations. The mast restrictive ins(ream
standard shown in Table l!I-2 is !. I mg/~~ jar September and October. Using (hrs s[atdard in the mass balance
enlculntion results in a lirnitaion oj2,780 mg/~ -much greater than any concen.!ration erpecred to be found in the
effluent. Therejor'e. no limitation or monitoring jar ammonia will be reyair'ed.
Memlc (out(nlLc 003. 022. 024): For mctnlr with dirrolved.ctnndnrdr, corresponding effluent limilr are based upon
the potentially rli.csolved method ojunulvsi.r. For smndurdr bused upon the total and total recoverable methods of
nnnlyci.r, the limits are based upon the same method nr the .standard. except for nr.renic. For arsenic. the mtnl
recoverable nnulysi.r must he performed using n grnphue jur'nuce.
/n the event dre background concentration war reported a.r lolnl recoverable rand (he most stringent criteria was
bored on the potentially dicrolved method ojnnnlvri.r, background concenvntion.c were assumed to be zero.
Similarly, ijthe 6nckground concemtrnrion was reported ar porentin(!y dissolred and the roost stringent criteria rrns
based on u torn/ recoverable medrad of nnnlvci.r, bnckgrowrd concentralion.c wera ul.ro n.r.cumed to he zero. Table
V/-h /isrc the maximum efJlaenr corrcenrration of pollutants that could he di.cchun;ed from Outjnllr (J03, 022, rand
024.