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Permit Number COG-500000 <br />Facility Number COG-500438 <br />Page 1 <br />Colorado Discharge Permit System Regulations <br />MINOR AMENDMENT NO. 1 to CERTIFICATION <br />under <br />DMCHARGESASSOCMTED WITH SAND AND GRAVEL MINING AND PROCESSING OPERATIONS <br />(AND OTHER NONMETALLIC MINERALS EXCEPT FUEL) <br />Category 07, Subcategory ]A, Current annual fee $270 (CRS 25-8-502) <br />Amendment fee=25% of annual fee ($67.50) <br />This certification specifically authorizes Northern Colorado Constructors, Inc. to discharge in accordance with the <br />General Permit for Sand and Gravel Mining and Processing Operations (and other nonmetallic minerals except fuel). <br />All correspondence relative to this facility should reference the specific facility number, COG-500438. <br />Permittee Contacts <br />Northern Colorado Constructors, Inc. Chris Zadel, Treasurer <br />9075 Weld County Road 10 <br />Fort Lupton, CO 80621 <br />Phone: 303-857-1754 Fax: 303-857-2933 <br />Minor Amendment No. 1 <br />In a letter dated September 15, 2008, the permittee requested that an additional discharge point be added to the certification to <br />discharge. The location of the new discharge point is to Little Dry Creek and the associated discharge flow rate will be an average of <br />6.2 MGD. <br />The permittee also requested that the project activity location be corrected from Weld County Road 29 to Weld County Road 25. <br />the certification has been amended to include these revisions. This is the applicable certification to discharge. <br />Project Name, Activity and Location <br />NCQI Pit #1- Product wash water and ground water from pit dewatering associated with construction sand and gravel mining is <br />discllwged from this site. The facility is located at 8249 Weld County Road 25 in Fort Lupton (Weld County), CO; Latitude: 40° 07' <br />12" north, longitude: 104° 49' 57" west. <br />Out ails <br />memo 11 mill I I <br />001A Discharge from a settling basin flows to Little Dry Creek. Avg.= 6.2 MGD <br />002A Discharge from a settling basin flows to Little Dry Creek. Avg.= 1.5 MGD <br />003A Discharge from the southwest corner of the south cell basin flows to Little Dry Creek Avg.= 6.2 MGD <br />----------General Permit Requirements----------- <br /> Continuous / Recorde <br />i / <br />Flow, MGD Report NA Report Discharge Evaluation 2 <br />Instantaneous In-situ <br />I, s u N/A NA 6.5-9.0 Water Quality Standards 2 Days/Month Grab <br />and Grease mg/l N/A NA 10 State Effluent Regulations 2 Days/Month Visual ' <br />i otal Suspended Solids, mg/l 30 45 NA State Effluent Regulations 2 Days/Month Grab <br />- If power is not available, flow may be measured on an instantaneous basis. Facility shall monitor flow 2 days / month. <br />3 - If a visual sheen is noticed, a grab sample must be taken and analyzed for oil and grease <br />AMENDED AND EFFECTIVE. OCTOBER 6 2008 EXPIRATION. JUNE 30 2013 <br />i <br />Effluent Parameters <br />The discharges will flow to Little Dry Creek within Segment 3a of the Middle South Platte River Sub-basin, South Platte River <br />Basin. This segment is found in the Classifications and Numeric Standards for the South Platte River Basin (Regulation No. 38; last <br />update effective March 1, 2008). Segment 3a is designated as Use Protected and is classified for the following beneficial uses: <br />Aquatic Life, Class 2 (Warr.); Recreation, Class la; and Agriculture.