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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division Rationale -Page /2, Permir No. CO-0043648 Table V/-1 EJJluera Limits Jor: Discharge Poims OOIA (no stormwttter) and OOIB (includit:g stormwater) - Arequa Gulch at Station AGI.S; and Point 007A, Discharges From the Valley Leach Facility That Qualify Jor Annual Precipitation or Storm Exemptions Discharge Limitations- Maximum Concentrations E,(/luent Parameter 30-Day Avg. ..: 7-Day Avg. Daily..Max.. Ratiorutle continued from previous page Aluminum, PD, ug/1 (!bs/day) Report (Repon) N/A Report (Report) Water Quality Standards Arsenic, PD, ug/1 (lbs/day) 50 (Report) N/A 50 (Report) Water Quality Standards Cadmium, PD, ug/l (lbs/day) 3.4 (Report) N/A 19 (Report) Wares Quality Standards Chromium, Ill, PD, ug/t (tbs/day) SO (Report) NIA 50 (ReponJ Water Quality Standards Chromium, VI, Diss, ug/l (lbs/day) 11 (Repon) N/A 16 (Repon) Water Quality Standards Copper, PD, ug/1 (lbs/day) 39 (Report) N/A 65 (ReponJ Water Quality Standards Iron, TR, ug/1 (!bs/day) 1,000 (Report) N/A Report (Report) Water Quality Standards Lead, PD, ug/! (Ibs/day) 28 (Report) N/A Report (Report) Water Quality Standards Manganese, TR, ug/l (lbs/day) 1,000 (Report) N/A Report (Report) Water Quality StandardG Mercury, Totat, ug/t (Ibs/day) D. DI (Report) N/A Repon (ReponJ Water Quality Standards Nickel, PD, ug/l (lbs/day) 274 (Report) N/A Repon (Repon) Water Quality Standards Silver, PD, ug/l (!bs/day) Repon (ReponJ N/A 22 (ReponJ Water Quality Standards Zinc, PD, ug/1 (lbslday} 343 (ReponJ N/A 379 (Report) Water Quality Standards WAD Weak Acuff Dissociable PD Potentially Dissolved TR Total Recoverable Diss Dissolved Nute: Limits ,(ar discharge poim OOIA apply during any period after at 24 hmtrs have passed since the fast rain event or since snown:elt in arty area tributary to this point has ceased. Limits for point 001 B apply during any rain or snowmelt events w/rich produce visible runoff in the diversion channel, up until 24 hours after such precipitation events hove tensed.