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nC O L O R A D O <br /> Department of Public <br /> Health b Environment <br /> Dedicated to protecting and improving the health and environment of the people of Colorado <br /> CERTIFICATION TO DISCHARGE UNDER <br /> CDPS GENERAL PERMIT COG500000 <br /> DISCHARGES ASSOCIATED WITH SAND & GRAVEL MINING AND PROCESSING <br /> (and other Nonmetallic Minerals except fuel) <br /> Certification Number: COG502202 <br /> This Certification to Discharge specifically authorizes: <br /> Colorado Quarries Inc RECEIVED <br /> to discharge from the facility identified as <br /> Black Obsidian JUL 19 2022 <br /> to: DIVISION OF RECLAMATION <br /> Grape Creek-Arkansas River MINING AND SAFETY <br /> Facility Located at: Emery St and Main St, Westcliffe, Custer County, CO 81252 <br /> Center Point Latitude 38.142750, Longitude -105.443861 <br /> Defined Discharge <br /> Outfall(s)to,Surface L Lam Discharge Outfall(s) Description Receiving Stream MGD <br /> Water 8 <br /> Outfall Number 38.143028, Stormwater discharge from sand a Grape Creek NA <br /> 001-A -105.447034 gravel facility Arkansas River <br /> Outfall Number 38.141211, Process water from crushing and Grape Creek 0 2 <br /> 002-A -105.444134 screening comingled with stormwater I Arkansas River <br /> All discharges must comply with the lawful requirements of federal agencies, municipalities, counties, <br /> drainage districts and other local agencies regarding any discharges to storm drain systems, conveyances, or <br /> other water courses under their jurisdiction. <br /> Permit Limitations and Monitoring Requirements apply to outfall(s) 002A as outlined in the Permit in <br /> Parts I.C.1, I.D, and I.E. <br /> Crushed Stone and Construction Sand and Gravel Facilities (SIC Codes 1429) <br /> Permitted Feature ID: 002A <br /> Permitted Feature Type: External Outfall <br /> Limit Set: 2 <br /> Discharge Limitations Monitoring Sample Type <br /> Maximum Concentrations Frequency <br /> Parameter Unity 30-Day 7-Day <br /> Average Average Daily Max. <br /> Flow', Instantaneous, ' <br /> 50050 MGD 0.2 NA Report Monthly' In-situ <br /> pH, (Minimum- <br /> Maximum) S.u. NA NA 6.5-9.0 2x/month Grab <br /> 00400 <br /> Page 1 of 3 <br /> 4300 Chern,Creek Drive S..Denver.CO 80246-1530 P 303-692-2000 �NAw.colorado gov/cdphe/v%gc eY <br />