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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT: Water Quality Control Division Rationale. Page 7, COG-0500000 Sand and Gravel General Permit The basin regulations contain information on the adopted standard for the segment (basic standard or site-specific standard) for stream segments for selenium (see examples below), and should be checked for the specific segment and modifications. When temporary modifications are listed for a stream segment, the acute and chronic aquatic life standards of 18.4 ug/l and 4.6, respectively, may not apply. Regulation No. Main water Bodies Expiration Dates 32 Rock Creek, Salt Creek, Peck Creek, St. Charles River 1213112012 Greenhorn Creek, Sixmile Creek, Huerfano River, Cucharas River, Boggs Creepy Fountain Creek, Arkansas River, Apishapa River, Purgatoire River 33 None None 34 Animas River, Cement Creek, Mineral Creek 12/31/2011 35 Gunnison River, Uncompahgre River, Bear Creek 12/31/2011 36 Alamosa River 12131/2011 37 Colorado River and tributaries, Johnson Creek, Yellow Creek 12/31/2011 38 South Platte and tributaries, 12131/2011 Big Thompson Creek 1213112009 j. Compliance Schedules- Existing dischargers may be granted compliance schedules for any new effluent limitations applicable to the discharge. Some items for which a compliance schedule may be necessary may require an individual permit. Note that compliance schedules cannot be granted for limitations based upon the federal ELGs. k. Monitories Requirements- See Section LB of the permit for monitoring requirements. in. Permit Termination- Sites that are covered by a bond under the Colorado Division of Reclamation, Mining, and Safety will need to prove that bond release has occurred before permit coverage can be terminated. Sites that are not covered under a bond must provide additional information before the permit can be terminated. V. STORMWA TER DISCHARGES As required under the Clean Water Act amendments of 1987, the Environmental Protection Agency (EPA) has established a framework for regulating municipal and industrial stormwater discharges. The Water Quality Control Division ("the Division') has stormwater regulations (5CCR 1002-61) in place. These regulations require specific types of industrial facilities that discharge stormwater associated with industrial activity (industrial stormwater), to obtain a CDPS permit for such discharge. The regulations specifically include sand and gravel mining activities as industrial facilities. Facilities which discharge industrial stormwater either directly to surface waters or indirectly, through municipal separate storm sewers, must be covered by a permit. This general permit does not cover stormwater only discharges, which are covered under stormwater permit COR-340000: The federal effluent guidelines that govern discharges from sand and gravel mining facilities (40 CFR 436) control most surface runoff. However, there are some sources of stormwater from these sites which are not addressed, such as roads and railroad lines, pond outslopes, inactive loadouts, sites used for storage and maintenance of material handling equipment, etc. Stormwater Management Plan (SWMP):" The stormwater regulations primarily apply to areas not covered by 40 CFR Part 436 They require permittees to develop and implement a Stormwater Management Plan (SWMP) to protect the quality of stormwater leaving the site. The plan shall identify potential sources of pollution (including sediment) which may reasonably be expected to affect the quality of stormwater discharges associated with mining activity. In addition, the plan shall describe the best management practices (BMPs) which will be used to reduce the pollutants in stormwater discharges from the mining site. Some activities required under the SWMP may already be in place. However, the SWMP will require the permittee to coordinate these activities with any necessary new activities in an orderly manner, so that the result is the reduction or elimination of pollutants reaching state waters from areas not limited by effluent limitations. Facilities must implement the provisions of the SWMP required under this part as a condition of this permit. It is the permittee's responsibility to notify the Colorado Division of Reclamation, Mining and Safety of any significant changes at their site resulting from the implementation of the SWMP. This is so that the Division of Reclamation, Mining and Safety may review the SWMP and incorporate any potential revisions into the facility's reclamation permit which might be needed. TTie SWMP shall include the following items, at a minimum: a) Site Map