2021-06-04_PERMIT FILE - M2021037

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PART Page 19 of 67 Permit No.: COG500000 the National Climatic Center, National Oceanic and Atmospheric Administration for the locality in which such impoundment is located. 2. Stormwater Discharge Effluent Limitations a. Practice Based Effluent Limitations i. Minimize exposure The permittee must minimize the exposure of pollutant sources associated with manufacturing, processing, and material storage areas(including loading and unloading, storage, disposal, cleaning, maintenance,and fueling operations)to rain, snow, snowmelt,and runoff. Minimizing exposure may include locating these industrial materials and activities inside or protecting them with storm resistant coverings. ii. Good housekeeping The permittee must keep clean all areas exposed to stormwater runoff, as necessary to minimize potential sources of pollutants, using such measures as sweeping at regular intervals, keeping materials orderly and labeled, and storing materials in appropriate containers. iii. Maintenance of Control Measures The permittee must maintain all control measures(structural and non-structural) used to achieve the effluent limits required by this permit in effective operating condition.The permittee must conduct maintenance of control measures in accordance with Part.I.G (Control Measures)of this permit. iv. Spill prevention and response procedures The permittee must minimize the potential for leaks,spills and other releases that may be exposed to stormwater and develop plans for effective response to such potential spills.The permittee must at a minimum implement: a) Procedures for regularly inspecting,testing, maintaining, and repairing all industrial equipment and systems to avoid situations that may result in leaks, spills, and other releases of pollutants in stormwater discharged to receiving waters. b) Procedures for plainly labeling containers that could be susceptible to spillage or leakage to encourage proper handling and facilitate rapid response if spills or leaks occur; c) Preventative measures such as barriers between material storage and traffic areas,secondary containment provisions,or procedures for material storage and handling; • Permittees must implement control measures(secondary containment or equivalent protection)for any chemical (e.g., petroleum products, pesticides, magnesium chloride,treatment chemicals, etc.) located at the facility to contain all spills and prevent any spilled material from entering state waters. The containment system must have sufficient capacity to contain 10%of the volume of containers,or the volume of the largest container plus 10%,whichever is greater. d) Procedures for expeditiously stopping, containing, and cleaning up leaks, spills, and other releases. Employees who may cause, detect, or respond to a spill or leak must be trained in these procedures and have necessary spill response equipment available; and e) Procedures for notification of appropriate facility personnel, emergency response agencies, and regulatory agencies. Contact information must be in locations that are readily accessible and available. v. Erosion and sediment controls The permittee must stabilize exposed areas and manage runoff using structural and/or non-structural control measures to minimize onsite erosion and sedimentation, and the resulting discharge of pollutants.Among other actions taken to meet this effluent limit,flow velocity dissipation devices must be placed at discharge locations and within outfall channels where necessary to minimize erosion and/or settle out pollutants. vi. Management of runoff and Pollutant Removal The permittee must divert; infiltrate; reuse; contain; or treat stormwater runoff to remove pollutants, in a manner that minimizes pollutants in stormwater discharges from the site.