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`U IC0L0RAD0 <br /> Department of Public <br /> • ' Health 8 Environment <br /> Dedicated to protecting and improving the health and environment of the people of Colorado <br /> Karl Nyquist, Mgr <br /> Prowers Aggregate Operators LLC <br /> 7991 Shaffer Pkwy Ste 200 <br /> Littleton, CO 80127 <br /> Memorandum <br /> TO: Prowers Aggregate Operators LLC <br /> FROM: Kelly Drengler Permit Writer, 303-692-3518 <br /> Debbie Jessop Tech IV 303-692-3590 <br /> DATE: 12/22/2016 <br /> RE: Certification, Colorado Discharge Permit System-Sand and Gravel Mining and Processing <br /> Fact Sheet and Information for Permit Number COG500000 Certification Number: COG501574 <br /> Permittee-Facility: Prowers Aggregate Operators LLC -West Farm Pit <br /> ATTACHMENTS: <br /> Certification COG501574 <br /> CDPS General Permit for Sand and Gravel Mining and Processing(And Other Nonmetallic Minerals Except <br /> Fuel) <br /> The Water Quality Control Division (the Division) reviewed the renewal application materials submitted for the West <br /> Farm Pit facility (the facility)and determined that it qualifies for coverage under the CDPS General Permit for Sand <br /> and Gravel Mining and Processing (And Other Nonmetallic Minerals Except Fuel, (the general permit). <br /> The attached certification authorizes discharges under the general permit; a copy of the general permit is also <br /> attached. The certification authorizes the permittee to discharge in accordance with the conditions of the general <br /> permit, and provides site-specific monitoring requirements. The permittee is required to comply with all conditions <br /> included in the general permit as well as the certification. <br /> DISCHARGE SPECIFIC INFORMATION <br /> The discharge is to Arkansas River within Segment 01c of the Lower Arkansas River Sub-basin, Arkansas River Basin, <br /> found in the Classifications and Numeric Standards for the Arkansas River Basin (Regulation No. 32) (COARLA01c). <br /> Segment 01c is Use Protected,and is classified for the following beneficial uses: Aquatic Life, Class 2 Warm; <br /> Recreation Class E; Water Supply; and Agriculture. <br /> This facility discharges scrubber waters, mine dewatering and commingled stormwater at Outfall 001A.This <br /> certification also authorizes stormwater discharges that do not commingle with process water discharges listed above <br /> from Outfall 002A. <br /> Low Flow Determination <br /> The chronic low flow, 30E3, represents the 30-day average tow flow recurring in a three-year interval, and is used in <br /> determining monitoring requirements and developing limitations based on a chronic standard. <br /> To determine the low flows available to the West Farm Pit, USGS gage station 07133000 (Arkansas River at Lamar, <br /> CO)was used. This flow gage provides a representative measurement of upstream flow because it is located <br /> immediately upstream of the West Farm Pit. <br /> Fact sheet Page 1 of 5 I <br /> 4300 Cherry Creek Dnve S.,Denver,CO 80246.1530 P 303-692-2000 www.colorado.govIcdphe/wgcd JET W. Hickenlooper,Governor I Larry Wolk,MD,MSPH,Executive Director and Chief Medical Officer <br />