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COLORADO DEPARTMENT OF HEATH, Wnte+-Onnliq~Divisiar Rmionnle - Prtge l3, Permit No. CO-0043648 nn nntidegradation review is not required. Water quality standards have been established using (IJ Table Yalue Standards a:d (1) existing water quality data. The current water quality standards for Arequa Gulch have been used as the basis for dte permit limitations. The Water Quality Control Division's Assessment Unit has recently concluded, based on floe periods of record presented to the Water Quality Control Commission, that the current water quality standards m•e beittgmet. The permit limitfor pHis based on recent nnabient data as reflected it: the single TemporayModification to the standards. Permit IintitsforTSSare Eased an S CCR 1002-62.4. Permit limitations for all other parameters are the underlying water quality standards. The perttft limitations may, therefore, be adjusted to conform to the water quality standards in accordance with 5 CCR 1002 61.10. In this renewal, none of the proposed permit limitations are less sh•ingent than those cw•rently in effect. B. Monitoring 1. Monitoring -Monitoring will be required as sltown in the following tables. Refer to the permit for locations ofmonitoring points. Intheselectionofntonitoringfrequencyforenchparameter,severnlfactorswereconsidered includingtbefrequencyofdetection and level of the pollutant found in past monitoring, the level of the corresponding effluent limit, the potential toxicity of the pollutant, and Ylte need for accuracy in the »teasuretnent of the parameter. Ifthe results of monitoring pet formed in cotnpliattce with the specified frequencies, demonstrate that mt alternate frequency would be more appropriate, the permit may be reopened, subject to the provisions of the Regulations of the State Discharge Permit System, in order to incorporate that frequency. For discharges which flow intermittently, samples must be collected at least once within the calendar period that is delineated by the rnonitorirtg frequency if a discharge has occurred during that period. For discharge Outfall OOIA, no special sampling restrictions related to stout: water apply. However, the data that are collected »tttst provide art accurate representation oflhe quantity and quality ofthe water flowing past the point. Ifsarnples are collected when direct sut face runoff resulting from rainfall is observed in the flow being monitored, this must be noted and reported on the DMR. Table VI-3 Monitoring for Outfall: OOlA >- E uenfRarnirietei• ~`~~i~leasuiementFre ue"n ' `' .~ Sam Ie'T ~ ~ e Flow, MGD 3 Da s/Week Instantaneous TSS, to /! Montltl Grab Oil and Grease, m~/1 Weekl Visual H, su (rnaximumhninirnum Weekl Ire-Situ Annnonia, Total, /1 Weekl Grab Cyanide, Free, pg/1 Weekly Grab Aluminum, Potential[ Dissolved, R Weekl Grab Cadmium, Potential[ Dissolved, A Weekl Grab Co er, Potential[ Dissolved /1 Weekl Grab Iron, TotnlReeoverable, R Manthl Grab Lead, Potential) Dissolved, /1 arterl Grnb Man nnese, Potential[ Dissolver[, 0/1 Weekl Grab Mercury, Total, pg/1 Monthly Grab Nickel, Potential[ Dissolved, /1 uarterl Grab Zinc, Potential) Dissolved, /1 Weekl Grab Table VI-4 Monitoring for Outfall.• DOSB ~.:'=>`-°E tientrPardineier °~_C~ ;:MeasuretrieritEr"e uenc ;:=Sant le_T e.... --- Flow, MGD Twice er dischar a Instarttarteous TSS, m Q Twice er dischar e Grab Oil and Grease, rn /l Twice er dischar a Visual H, su (maximumhninimum Twice er dischar a In-Situ Ammonia, Total, A Twice er dischar e Grab Cyanide, Free, pg/1 Twiceperdischarge Grab Aluminum, Potential! Dissolved, /1 Twice er dischar a Grab Cadmium, Potenh'all Dissolved, /1 Twice er dischar a Grab Co er, Potential[ Dissolved, /1 Twice er dischar a Grab Iron, Total Recoverable, /l Twice er dischar e Grab Lend Potential[ Dissolved, /1 Twice er dischar a Grab Mnn nnese, Potential[ Dissolved /1 Twice er dischar e Grab