1. Stormwater Overview Board of County Commissioners Planning Conference March 1, 2007

2. Stormwater Ordinance Required to meet Phase II Regulations Proposed to address secondary and cumulative impacts related to: 12 Mile WWTP expansion to 6 mgd 42-inch water transmission main 74 ByPass, Carolina Connector Expected to be required for future projects

3. Proposed Ordinance Section I – Stormwater Design Manual Section II – General Drainage Includes requirements in Land Use Ordinance Concentrated flow to adjacent properties Permanent drainage easement recordation Section III – Riparian Buffers Streamside Zone Undisturbed land along stream channel Exemptions include limited access and utility crossings, gravity sewer and stormwater bmp’s with no alternative, fences, dam maintenance, stream restoration

4. Proposed Ordinance Section III – Riparian Buffers (continued) Upland Zone Vegetative land along Streamside Zone Allowable uses include exemptions from Streamside Zone, storage buildings less than 150 sq ft, limited grading, greenways, recreational equipment

5. Proposed Ordinance Section IV – Stormwater Requirements Applicability: Cumulatively disturb > 1 acre Total impervious surface > 20,000 sq ft Exceed 6% impervious in protected watersheds Runoff Control Downstream hydrologic analysis High Density (exceeds 24% built-upon) control 1-inch rain, discharge equals pre-development rate, 85% TSS removal, post equals pre-development run-off rate for 1, 10, and 25-year storm Convey upstream drainage assuming build-out conditions 100-year storm elevations defined

6. Proposed Ordinance Section IV – Stormwater Requirements Final Plat Requirements Streams, ponds, wetlands, buffers, base flood boundary and elevations Permanent drainage easements Statement lot contains stormwater management facility As-Builts Annual Inspection Report Performance Security Plan Review Fee

7. Schedule May 2007 - Presentation to Planning Board June 2007 – Public Hearing and comment period August 2007 – Presentation to Board of County Commissioners