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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />Rationale -Page 11, Permit No. CO-0043648 <br />Also, if discharge occurs as a result of the 10-year, 24-hour storm volume being a:ceeded and the <br />permirtee wishes to claim the exemption from technology based ejJluent limitations, the permirtee shall <br />submit, within 5 days of the said discharge, documentation that the facility was maintained to contain <br />the previously specified volume. The permirtee must afro submit documentation of the storm event, <br />including the precipitation gauge station (or the perminee's own gauge), the volume of runoff <br />produced and the steps taken to maintain treatmem and minimize the amount of overflow. <br />All data/documentation required by this section which can not be reported on applicable discharge <br />monitoring report formr (DMRsJ shall be reported in a letter as art attachment to the DMR. Submittal <br />of documentation of containmem, maintenance and precipitation records above does not exempt the <br />permittee from the standard norification requirements of the permit. <br />d. Limits, for Soecific Discharge Poinu In addition to the limits listed in the following tables, the "No <br />Discharge" limitation described in section VI.A.I.a. applies to all potential discharges that may be <br />tributary to the discharge points listed. This may require, in addition to maintaining compliance with <br />the numeric limits shown, demonstration that there has been no statrstical increase in instream <br />pollutant concentrations or loads. This is discussed in more detail in the monitoring conditions <br />sections of both the rationale and the permit. <br />Table V/-l EJJluent Limits jot: <br />Discharge Points OOIA (no starmwater) and OO1B (including stormwater) - Arequa Gulch at Station AGI.S; and <br />Point 007A, Discharges From the Valley Leach Facility That Qualify jot Annual Preciprtation or Storm Exemptions <br />Discharge Limilatians - Maximum Concentrations <br />Ejfiueru Parameter 30-Day Avg. 7-Day Avg. Daily Max. Rationale <br />Limits Which App(v Only To Discharge Points LbIA /no srormwarerl wd 00/B Mctuding srormwared - Areoua Gu/ch a AGI S <br />Cyanide, WAD, mg/1 (!bs/day) Report (Report) N/A 0.030 (Report) Water Quality Standards <br />Limits Which Apply Onlv Tp Point 007A -Discharges From the Voflrv Leach Facirity Which OupliPo For Annual Precipitation or Storm Exemptions <br />TSS, mg/! 20 N/A 30 Effluent Guidelines <br />Cyanide, WAD, mg/l (lbs/clay) Report (Report) N/A 0.030 (Report) Water Quality Standards <br />WET, Chronic Lethality N/A N/A Statistical Stare Permit Regulations <br />Difference <br />Linurs LL'hich Apply to Points OOIA. 00/B. and t?07A <br />Flow, MGD Report N/A Report Discharge Assessment <br />pH, su (minimum-maximum) N/A N/A 6.5-9.0 Water Quality Standards <br />Total Hardness, mg/1 Report N/A Repon Discharge Assessment <br />Ammonia, Total, mg/l (!bs/day) Nor Required Until C}~anitle Removal Process Is Begun <br />conr'd <br />