2012-05-23_PERMIT FILE - M2012013

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STORMWATER DISCHARGE PERMIT This project requires the obtaining of a NPDES /CDPS General Permit for Stormwater Discharges Associated with Construction Activity (COR- 030000) from the Colorodo Deportment of Public Health and Environment, Water Quality Control Division (the "Division "). Coverage under this general permit expires on June 30, 2012 INACTIVATION NOTICE Permittee(s) wishing to terminate coverage under the permit must submit an Inactivation Notice to the Division after final stobilizotion of the project or another owner (permittee) has ossumed control over all areas of the site that have not undergone final stabilization. Final stabilization has occurred when all soil disturbing activities of the site have been completed, and uniform vegetative cover has been established with a density of at least 70 percent of pre - disturbance levels, or equivalent permonent, physical erosion reduction methods hove been employed. For purposes of this permit, establishment of a vegetative cover capable of providing erosion control equivalent to pre- existing conditions at the site will be considered final stabilization. RETENTION OF RECORDS A copy of the Stormwater Management Plan, any changes to it, and inspection and maintenance records must be kept at the site during construction and made readily availoble to the Division upon request The owner shall retain copies of these documents for 3 years of ter submittal of the Inactivation Notice STANDARD PERMIT CONDITIONS The contractor is encouraged to view the listing of Standard Permit Conditions that apply to this general permit. The general permit con be viewed on -line at the Division website http / /www cdphe state co us/ wq/ PermitsUnit /stormwater /SWpermitsrats/ SWConstructionPermit pdf STORMWATER MANAGEMENT PLAN The Division moy notify the owner at any time that the Stormwater Management Plan (SWMP) does not meet minimum requirements. After such notification, the owner shall make the changes to the SWMP and the contractor shall perform the required changes The owner shall submit to the Division a written certification that the requested changes have been mode. The owner shall inform the Division (Permits Unit) in writing of any intent to significantly change activities from those indicated in the permit application (this does not include changes to the SWMP) Upon request, the permittee shall furnish the Division with such plans and specifications which the Division deems reasonably necessary to evaluate the effect on the discharge and receiving stream. The SWMP shall be updated within 30 days of the changes The owner shall submit this notice to the Division within two weeks after revising the scope of work Any discharge to the waters of the State from a point source other than that specifically authorized by this permit is prohibited. The owner's Construction Manager shall oversee the implementation of the SWMP, and the installation, inspection, and maintenance of the erosion prevention and sediment controls before and during construction. The owner's Operations Monager shall ensure that the SWMP will stay in effect ofter the construction project is completed, the entire site has undergone final stabilization, and an Inactivation Notice has been submitted to the District. The owner shall provide personnel to inspect disturbed areas of the construction site, material storage oreas for potential hazardous material leaks, vehicle entrance /exits for sediment tracking, and all erosion control devices. The general permit requires inspection at least every 14 days and within 24 hours after any precipitation or snowmelt event that causes surface erosion. Where ports of the construction site hove undergone final stabilization, but work remains on other parts of the site, inspections of the stabilized areas may be reduced to once per month. Inspections will not be required ot sites where snow cover exists over the entire site for an extended period, and melting conditions do not exist. The inspector mentioned above will prepare an Inspection Form, to be kept with the SWMP At o minimum, each report must include' 1) The inspection dote: 11) Nome(s) and title(s) of personnel making the inspection. in) Location(s) of discharges of sediment or other pollutonts from the site; iv) Location(s) of BMP's that need to be maintained: v) Location(s) of BMP's that failed to operate as designed or proved inadequate for o particular location, vi) Location(s) where additional BMP's are needed that were not in place ot the time of inspection: vii) Deviations from the minimum inspection schedule as provided above; vin) Description of corrective action for items iu, iv, v and vi above, dates corrective action(s) taken, and measures taken to prevent future violations, including requisite changes to the SWMP, as necessary, and ix) After adequate corrective action(s) hos been token, or where o report does not identify any incidents requiring corrective action, the report shall contain a signed statement indicating the site is in compliance with the permit to the best of the signer's knowledge and belief. The form may also include dates when major grading activities occurred or ceased in areas, and dates when areas were stobilized A list of hazardous materials stored on site at the time of inspection should be made on the inspection form as well. The Stormwater Management Plan shall be updated to reflect any actions token after the site is inspected Records of spills, leaks, or overflows that result in the discharge of pollutants must be documented and maintained. Each record should contain: time and date of occurrence, weather conditions, reason(s) for the spill, and measures token to clean the spill. Any spill of chemicals, oil, petroleum products, sewoge, etc which may enter waters of the State of Colorado MUST BE REPORTED to the 24 -hour environmental emergency spill reporting line 1- 877 -518 -5608. All erosion prevention and sediment controls must be inspected to ensure integrity and effectiveness Sediment collected by silt fences shall be removed on a regular basis All silt fences must be repaired, replaced, or supplemented when they become non - functional These repoirs must be made within 7 days of discovery. Surface waters, including drainage ditches and conveyance systems, must be inspected for evidence of sediment being deposited by erosion. All deltas and sediment deposited in surface waters, including drainage ways and other drainage systems, must be removed and restabilized in areas where sediment removal results in exposed soil. The removal and stabilization must take place within 7 days of discovery unless precluded by legal, regulatory, or physical access constraints Tracked sediment must be removed from all off -site paved surfaces within 24 hours of discovery STORM WATER MANAGEMENT PLAN NOTES SITE DESCRIPTION 1 This project, located in Lincoln County, Colorodo, involves the reopening of a gravel pit that was used in the 1970's to obtain material for the construction of Interstate 70. The gravel extracted from this project will be used to construct access roods for an electrical generating wind turbine facility. The material will also be used to maintain local county roads which are used in conjunction with the wind turbine project 2 The project is located on approximately 86 02 acres The estimated disturbed area for these activities is 86.02 acres The estimated start dote for land disturbing activities is May 29, 2012 with an ending date on December 31, 2013. 3 Existing soils on the site predominatly Travessilla - Rock outcrop with limited topsoil Current land use is mostly rangeland. 4. See the SWMP Site Plon sheets for drainage patterns and slopes, locations of disturbed areas, location of structural controls and /or stabilization areas, and surface waters. 5. The site will be graded with o maximum of 3:1 slopes on completion of mining operations as port of the reclamation pion 6 The project site generally drains into unnamed tributaries of the Big Sandy Creek and to unnamed tributaries of Barron Creek to the Big Sandy Creek to the Arkansas River. EROSION AND SEDIMENT CONTROLS A STABILIZATION 1. Topsoil shall be stockpiled before mining begins and spread evenly over the surface ofter reclaimed. If inadequate top soil is present then manure shall be used in its place before gross planting. Slopes shall not exceed 3 :1 and shot be flatter where feasible 2 All exposed soil areas with a continuos positive slope within 200 lineal feet of a surface water must have temporary erosion protection or permanent cover for the exposed soil oreos year round, according to the following table of slopes and time frames (Maximum time on area can remain open when the area is not being actively worked) Type of Slope Steeper than 3:1 101 to 31 Flatter than 10:1 Time 7 days 14 days 21 days 3 Minimize disturbed areas. Match existing lond contours when possible Minimize impervious surfaces. Protect natural vegetation outside of construction areas and disturb to a minimum inside construction areas 4. Buffer strips of existing vegetation will remain adjacent to construction zones. 5 Dust control on the site will be monitored. The contractor will sprinkle access roods with water if the owner determines that dust is o problem. 6 The seed bed shall be well settled and firm but not compacted. The seedbed shall be free of weeds. 7 A soil test shall be performed to determine the proper fertilizer requirement for nitrogen and phosphate. In lieu of a soil test the planting area shall be fertilized at a rate at least 40 Ibs of nitrogen and 40 Ibs. of phosphate Animal manure may be used to supply all or port of the nutrients Fertilization shall occur around seeding time of the grass 8 The seed mixture shall consist of blue grams, sideoats grams, little bluestem and western wheat as directed by the NCRS. Grass drilling shall occur between November 1 through May 1 Weeds should be controlled mechanically or chemically until gross is established. Grazing shall be excluded for two growing seasons from the time of the planting of the seeded areas. Fencing may be needed to prohibit grazing 9 A minimum of 4000 Ibs. of (native) grass mulch per acre should be applied to the surfoce after the gross has been seeded to hold the ground until the grass has established The mulch shall be crimped into the surface (4 inch depth) with o mulch crimper. The mulch shall be weed free and not moldy. The site may also utilize Flexterro FGM in lieu of grass mulch B STRUCTURAL CONTROLS 1 Rock dam sediment traps shall be constructed at locutions where storm water leaves the site All runoff from disturbed areas shall be diverted into the sediment traps by use of diversion berms or ditches The volume of the trops shall be 3000 cubic feet for each disturbed acre estimated to be contributing runoff to each particular trop The contractor shall divert runoff from undisturbed areas as conditions allow Dams shall be constructed prior to major land disturbing activities. 2. Silt fence and wattles shall be placed downstream of disturbed areas as indicated within the site plans and as determined by the owner or contractor during construction. Silt fence shall be placed before site stripping the southwest corner of the site See the detail on the SWMP Notes sheet for correct installation and spacing of silt fence and wattles. 3 Temporary soil stockpiles must hove silt fence or other effective sediment controls, and cannot be placed in surface waters, including storm water conveyances such as ditches 4. Existing drainage ways on the site will be protected from site run -off by the use of wattles, silt fence ditch checks, rip -rap, or geotechnical fabric as determined by the owner or contractor during construction. OTHER PREVENTION MEASURES 1. Construction entrances odjocent to public /private roads shall be graveled /stabilized /compacted immediotely to prevent vehicle tracking of on -site sediments. 2. Provide portable toilets for proper disposal of sanitary sewage. Wastes shall be collected and disposed in compliance with local, state, and federal regulations. 3. Monitor construction vehicle maintenance areas. Note that external washing of trucks and other construction vehicles must be limited to a defined area of the site. Runoff must be contained and waste properly disposed of. No engine degreasing is allowed on -site. 4. Install containment berm or other secondary containment devices around fuel storage, equipment mointenonce areas, and chemical storage areas. Monitor storage areas for potential hazardous material spills. List any hozordous materials stored on site in the inspection report HAZARDOUS MATERIAL SPILL PREVENTING AND RESPONSE 1 The contractor is responsible for troining all personnel in the proper handling and cleonup of spilled materials. No spilled hazardous materials or wastes will be allowed to come into contact with storm woter discharges. If contact does occur, the storm water discharge will be contained on site until appropriate measures in compliance with all Federal, State, and local regulations ore followed to dispose of the hozordous substance In general, all hazardous materials shall be contained in the laydown construction staging oreo 2. In addition to Good Housekeeping and material management practices, the following practices shall be done to minimize the potential for hazardous material spills and to reduce the risk of the spill coming in contact with storm water. Manufacturer's recommended methods for spill cleonup will be clearly posted and site personnel will be trained regarding these procedures and the location of the informotion and cleanup supplies Materials and equipment necessary for spill control, containment and cleanup will be provided onsite in the material storage area. Equipment and materials will include but not be limited to brooms, dust pans, mops, rags, gloves, goggles, kitty litter, sand, sawdust, sorbent booms, and plastic and metal trash containers 3. In the event of a spill, the following procedures will be followed All spills will be cleoned up immediately following discovery The spill area will be kept well ventilated and personnel will wear appropriate protective clothing to prevent injury from contact with the hazardous substance 4. Material Management Practices- the following is a list of practices that will be used onsite to minimize the risk of spills or other accidental exposure of materials and substances to storm water runoff a. Good Housekeeping An effort will be mode to store onsite only enough products required to complete the job All materials stored onsite will be kept in a neat, orderly manner and in their appropriate containers. If possible, products shall be kept under o roof or other enclosure. Materials will be kept in their original containers with the original manufacturer's label Whenever possible, all of o product will be used up before disposing of the container. Manufacturer's recommendations for proper use and disposal will be followed. The job site superintendent will be responsible for daily inspections to ensure proper use and disposal of materials. b. Hazardous Products Products will be kept in their original containers with the original manufacturer's label The original labels and material safety data will be kept for each of the materials as they contain important product information Disposal of ony excess product will be done in a manner that follows all manufacturers', federal, local and state recommended methods for proper disposal 5. The following is a list of potential sources of pollution and specific practices to reduce pollutant discharges from the materials or sources expected to be present during construction o Petroleum All onsite vehicles shall be inspected and monitored for leaks and receive preventative mointenonce to reduce the chance of leakage b Fertilizers- sholl be applied in minimal amounts as recommended by the manufacturer. It shall be worked into the soil os to minimize the contact with storm woter discharge c Cleaning solvents- solvents shall not be discharged into the storm sewer system. The contractor shall refer to the manufacturer's instructions and federal regulations on the proper disposal from the site. d Solid and construction wastes - Al trash and construction debris shall be deposited into a dumpster that will be emptied as necessary. No construction waste materials will be buried on site The dumpsters must be put in a location where the contact with the storm water discharge is minimized. ISSUE DATE: 05 -14 -2012 0 a u Z a 3 � LL U N 1080169 0 N m m ) v� LL 3 2 2 .fl VR El Sheet 2 of 4