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67 4"%_`� COLORADO <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 Et GRAVEL MINING AND PROCESSING <br /> (and other Nonmetallic Minerals except fuel) <br /> Certification Number: COG502196 <br /> This Certification to Discharge specifically authorizes: <br /> Kilgore Companies LLC dba Elam Construction Inc <br /> to discharge from the facility identified as <br /> 23 1/4 West Pit <br /> to: <br /> Wilsea Drain - Colorado River <br /> Facility Located at: 23 1/4 Rd and Redlands Pkwy, Grand Junction, Mesa County, CO 81505 <br /> Center Point Latitude 39.09456, Longitude -108.62213 <br /> Defined Discharge Outfall(s) <br /> Outfall(s)to Surface Lat, Long Discharge Outfall(s) Description Receiving Stream MGD <br /> Water <br /> Mine pit dewatering; wash, sorting, <br /> Outfall Number 39.09203, and screening process water; Wilsea Drain 3.6 <br /> 001-A 108.62522 stormwater runoff from recycled Colorado River <br /> concrete and recycled asphalt <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 001A as outlined in the Permit in Parts <br /> I.C.1, I.D, and I.E. <br /> Crushed Stone and Construction Sand and Gravel Facilities (SIC Codes 1442) <br /> Permitted Feature ID: 001A <br /> Permitted Feature Type: External Outfall <br /> Limit Set: 2 <br /> Discharge Limitations Monitoring Sample <br /> Maximum Concentrations Frequency Type <br /> Parameter Units 30-Day 7-Day Daily <br /> Average Average Max. <br /> Flow' MGD 3.6 NA Report Continuous' Recorder' <br /> 50050 <br /> pH, (Minimum- <br /> Maximum) S.u. NA NA 6.5-9.0 2x/month Grab <br /> 00400 <br /> Total Suspended <br /> Solids, mg/l 30 45 NA 2x/month Grab <br /> 00530 <br /> Page 1 of 2 <br /> 4300 Cherry Creek Drive S,Denver,CO 80246-1530 P 303-692-2000 %%�vw colorado gov/cdphe/-,igc I <br />