Laserfiche WebLink
4. Areas within 1,000 feet upgradient or100 feet downgradient of <br /> active karst features; and <br /> 5. Areas that receive runoff from the following industrial facilities <br /> not authorized to infiltrate stormwater under the NPDES <br /> stormwater permit for industrial activities: <br /> a. Automobile salvage yards; <br /> b. Scrap recycling and waste recycling facilities; <br /> c. Hazardous waste treatment, storage, or disposal <br /> facilities, <br /> d. Wood preserving facilities; or <br /> e. Air transportation facilities that conduct deicing <br /> activities. <br /> ii. Filtration System <br /> 1) Filtration options include,but are not limited to: sand filters with underdrains, <br /> biofiltration areas, swales using underdrains with impermeable check dams and <br /> underground sand filters; <br /> 2) Must not install filter media until the contributingdrainage rainage area is constructed and fully <br /> stabilized unless they provide rigorous erosion prevention and sediment controls (e.g_ <br /> diversion berms)to keep sediment and runoff completely away from the filtration area; <br /> 3) Designed to remove at least 80 percent of TSS; <br /> 4) Must use a pretreatment device such as a vegetated filter strip, small sedimentation <br /> basin, water quality inlet, forebay or h dy rodynamic separator to remove settleable <br /> solids, floating materials, oils and grease from the runoff to the maximum extent <br /> practicable,before runoff enters the filtration system; <br /> 5 Designedprovide a waterguality volume as described in Section b.iii,b.iv, and b.v; <br /> 6 Designed to discharge all stormwater(including stormwater in excess of the water <br /> quality volume)routed to the system through the uppermost soil surface or engineered <br /> media surface within 48 hours. Additional flows that the system cannot filter within 48 <br /> hours must bypass the system or discharge through an emergency overflow; <br /> 7 Designed to provide a means to visually verify the system is dischargingthrough hrough the <br /> soil surface or filter media within 48 hours; <br /> 8) Employ appropriate on-site testing to ensure a minimum of three (3) feet of separation <br /> between the seasonally saturated soils(or from bedrock) and the bottom of the proposed <br /> filtration system; <br /> 9) Construct with an impermeable liner when the system has less than three(3) feet of <br /> separation between seasonally saturated soils or bedrock; <br /> 10) Designed with a maintenance access, typically eight(8) feet wide. <br /> Page 5 of 7 <br />