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Page 33 of 38 Permit No: MNR040000 APPENDIX B DEFINITIONS AND ABBREVIATIONS The definitions in this Part are for purposes of this permit only. 1. "Active Karst" means geographic areas underlain by carbonate bedrock (or other forms of bedrock that can erode or dissolve) with less than 50 feet of sediment cover. 2. "Agency" means the Minnesota Pollution Control Agency or MPCA. (Minn. Stat. § 116.36, subd. 2.) 3. "Alum or Ferric Chloride Phosphorus Treatment System" means the diversion of flowing stormwater from a MS4, removal of phosphorus through the use a continuous feed of alum or ferric chloride additive, flocculation, and the return of the treated stormwater back into a MS4 or receiving water. 4. "Applicable WLA"—means a Waste Load Allocation assigned to the permittee and approved by the USEPA. 5. "Best Management Practices" or"BMPs" means practices to prevent or reduce the pollution of the waters of the state, including schedules of activities, prohibitions of practices, and other management practices, and also includes treatment requirements, operating procedures and practices to control plant site runoff, spillage or leaks, sludge, or waste disposal or drainage from raw material storage. (Minn. R. 7001.1020, subp.5.) 6. "Commissioner" means the Commissioner of the Minnesota Pollution Control Agency or the Commissioner's designee. (Minn. Stat. § 116.36, subd. 3.) 7. "Common Plan of Development or Sale" means a contiguous area where multiple separate and distinct land disturbing activities may be taking place at different times, on different schedules, but under one proposed plan. One plan is broadly defined to include design, permit application, advertisement or physical demarcation indicating that land-disturbing activities may occur. 8. "Construction Activity" includes construction activity as defined in 40 CIFIR § 122.26(b)(14)(x) and small construction activity as defined in 40 CIFIR § 122.26(b)(15).This includes a disturbance to the land that results in a change in the topography, existing soil cover (both vegetative and non-vegetative), or the existing soil topography that may result in accelerated stormwater runoff, leading to soil erosion and movement of sediment into surface waters or drainage systems. Examples of construction activity may include clearing, grading, filling, and excavating. Construction activity includes the disturbance of less than one acre of total land area that is a part of a larger common plan of development or sale if the larger common plan will ultimately disturb one (1) acre or more. 9. "DNR Catchment Area" means the Hydrologic Unit 08 areas delineated and digitized by the Minnesota DNR.The catchment areas are available for download at the Minnesota DNR Data Deli website. DNR catchment areas may be locally corrected, in which case the local corrections may be used. 10. "Effective Date" means the date, located on the front cover of this permit, on which this permit shall become effective.