2015-09-11_PERMIT FILE - M1979059

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ATTACHMENT VI STATE OF COLORADO John W. Hickenlooper, Governor Christopher E Urbina, MD, MPH Executive Director and Chief Medical Officer Dedicated to protecting and improving the health and environment of the people of Colorado 4300 Cherry Creek Dr. S. Denver, Colorado 80246-1530 Phone (303) 692-2000 Located in Glendale, Colorado httpJ/www.cdphe.sIate.co.us May 14, 2013 Richard Coulson, CEO Coulson Excavating Co Inc 3609 N CR 13 Laboratory Services Division 8100 Lowry Blvd. Denver, Colorado 80230-6928 303) 692-3090 Loveland, CO 80538 RE: Certification, Colorado Discharge Permit System General Permit No. COR340000, Certification Number: COR341709 Coulson Excavating Co Inc—Brownwood Pit Dear Mr. Coulson; at'coca 9Q 1876 Colorado Department of Public Health and Environment The Water Quality Control Division (the Division) has reviewed the application submitted for the Brownwood Pit facility (the facility) and determined that it qualifies for coverage under the CDPS General Permit for Stormwater Discharges Associated with Sand & Gravel Mining and Processing (the stormwater permit). Enclosed please find a copy of: (1) the stormwater permit certification, which was issued under the Colorado Water Quality Control Act, 2) the general permit, (3) an Annual Report form, and (4) a blank Discharge Monitoring Report (DMR) form. This letter also notifies the permittee of the monitoring requirements associated with the Stormwater discharge permit for this facility. The Division refers permittees to EPA's website for a guidance document for Stormwater monitoring and sampling (EPA 832-13-09-003, Industrial Stormwater Monitoring and Sampling Guide, March 2009). Please review these materials closely. Discharge Specific Information Stormwater from the facility discharges to the Big Thompson River within Segment Big Thompson River of the South Platte River Sub -basin COSPBT04c), found in the Classifications and Numeric Standards for the South Platte River Basin. laramie River Basin, Republican River Basin, Smoky Hili River Basin (Regulation No. 38, effective 6/30/13). Segment COSPBT04c is Reviewable and classified for the following beneficial uses: Aquatic Life (Class 2 Warm); Recreation (Class E, 5/1-10/15) (Class N, 10/16-4/30), and Agriculture. Basis for Stormwater Discharge Monitoring The Division has determined that the practice -based effluent limits (i.e., SWMP and BMP requirements) In the Stormwater discharge permit are adequate to protect all water quality standards and meet any TMDL requirements applicable to stormwater discharges from this facility. However, as allowed by the stormwater discharge permit, the Division requires that the permittee sample stormwater discharges from the industrial activities conducted at the facility to: 1) measure the effectiveness of the BM Ps implemented at the facility with respect to removing pollutants from the discharge or meeting any applicable TMDL requirements and, 2) establish whether additional BMPs are required for any other pollutants for which the receiving water is impaired. The enclosed permit certification provides the sampling parameters for stormwater discharges from the facility. If information becomes available that indicates the stormwater discharge permit does not protect all water quality standards or meet applicable TMDL requirements, the Division may require an individual or alternate general permit coverage. The Division will use results from the stormwater discharge monitoring as part of this determination. Refer to the next section below for additional information. Benchmark Monitoring The enclosed permit certification also requires benchmark monitoring of stormwater discharges from the facility to confirm that protection of water quality is provided. The specific parameters and benchmark values applicable to such discharges are taken from the EPA 2008 Multi -Sector General Permit (2008 MSGP) forSectorJ – Non -Metallic Mineral Mining and Dressing.