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DocuSign Envelope ID:A3839651-094E-48D2-872A-CD6D1A8820BC <br /> Information:Contact the CDPHE-WQCD at(303)692-3500. For Applications and Instructions: <br /> https://www.colora do. ov acific cd phew -construction eneral ermits. <br /> Municipal Separate Storm Sewer System MS4 Requirements-When working in a MS4 area,discharges to the storm sewer system are <br /> subject to CDOT's or other municipalities'MS4 Permit. For activities within the boundaries of a municipality that has a MS4 permit,the owner <br /> of such activity should contact the municipality regarding stormwater related requirements.All discharges to the CDOT highway drainage <br /> system or within the Right of Way(ROW)must comply with the applicable provisions of the Colorado Water Quality Control Act,the Water <br /> Quality Control Commission(WQCC)Regulations(https://www colorado gov/pacific/cdphe/wqcc-regulations-and-policies-and-water-guality- <br /> statutes)and the CDOT MS4 Permit#COS-000005(https://www.codot.gov/programs/environmental/water-quality/documents).Discharges <br /> are subject to inspection by CDOT and CDPHE.For CDOT-related MS4 programs and requirements,go to: <br /> htt s: www.codot. ov ro rams environmental water ualit stormwater ro rams. <br /> Post-Construction Permanent Water Quality-When working in a CDOT MS4 area and the activity disturbs one or more acres,permanent <br /> water quality control measures may be required.Information on the requirements can be found under the CDOT Permanent Water Quality <br /> MS4 Program at:https://www.codot.gov/programs/environmental/water-quality/stormwater-programs/pwq-permanent-water-quality <br /> Discharges to Storm Sewer Systems <br /> Prohibited Discharges-All discharges are subject to the provisions of the Colorado Water Quality Control Act and the Colorado Discharge <br /> Permit Regulations.Prohibited discharges include,but are not limited to,substances such as wash water,paint,automotive fluids,solvents, <br /> oils or soaps and sediment. <br /> Allowable Discharges-The following discharges to stormwater systems are allowed without a permit from the CDPHE-WQCD:landscape <br /> irrigation,diverted stream flows,uncontaminated ground water infiltration to separate storm sewers,discharges from potable water <br /> sources,foundation drains,air conditioning condensation,irrigation water,uncontaminated springs,footing drains,water line flushing,flows <br /> from riparian habitats and wetlands,and flow from firefighting activities.Contact Information:Contact the CDPHE-WQCD at(303)692-3500. <br /> Information can also be found in the CDOT Illicit Discharge MS4 Program PDD at:https://www.codot.gov/programs/environmental/water- <br /> ualit stormwater ro rams idde.html. <br /> Spill Re ortin -Spills shall be contained and cleaned up as soon as possible.Spills shall NOT be washed down into the storm drain or buried. <br /> II spills shall be reported to the CDOT Illicit Discharge Hotline at(303)512-4426(4H20),as well as the Regional Permitting Office and Regional <br /> Maintenance Supervisor.Spills on highways,into waterways,any spill in the highway right-of-way exceeding 25 gallons,or that may otherwise <br /> present an immediate danger to the public shall be reported by calling 911,and shall also be reported to the CDPHE at 1-877-518-5608.More <br /> information can be found at https://www.colorado.gov/pacific/cdphe/emergency-reporting-line. <br /> Disposal of Drilling Fluids-Drilling fluids used in operations such as Horizontal Directional Drilling may be classified as"discharges"or"solid <br /> wastes,"and in general,should be pumped or vacuumed from the construction area,removed from the State Highway Right of Way,and <br /> disposed of at permitted facilities that specifically accept such wastes.Disposal of drilling fluids into storm drains,storm sewers,roadside <br /> ditches or any other type of man-made or natural waterway is prohibited by Water Quality Control and/or Solid Waste regulations.Small <br /> quantities of drilling fluid solids(less than 1 cubic yard of solids)may be left on-site after either being separated from fluids or after infiltration <br /> of the water,provided:1)the drilling fluid consists of only water and bentonite clay,or,if required for proper drilling properties,small <br /> quantities of polymer additives that are approved for use in drinking water well drilling;2)the solids are fully contained in a pit,and are not <br /> likely to pose a nuisance to future work in the area, <br /> 3)the solids are covered and the area restored as required by CDOT permit requirements(Utility,Special Use,or Access Permits,etc.).Contact <br /> Information:Contact CDPHE(telephone#'s listed above). <br /> Noxious Weeds and Invasive Species Management Plan-Noxious Weeds and Invasive Species guidance can be found by contacting the <br /> Colorado Department of Agriculture(https://www.colorado.gov/pacific/agconservation/`noxiousweeds)and the Colorado Division of Parks <br /> and Wildlife(httP://cpw.state.co.us/aboutus/Pages/RS-NoxiousWeeds.aspx).In either case,management plans involving the control of <br /> noxious weeds associated with the permitted activity and cleaning of equipment will be required. <br /> Environmental Clearances Information Summary Page 3 of 3 Colorado Department of Transportation June 2020 <br />