Isle of Wight County Chesapeake Bay TMDL Action Plan. May 2015

Transcription

1 Isle of Wight County Chesapeake Bay TMDL Action Plan May 2015

2 Background Chesapeake Bay Agreement 12/15/1987 Chesapeake Bay Preservation Act 1988 County Local Ordinance - November 1990 Chesapeake Bay 2000 Agreement After 25 Years EPA Determined More Work Needed Chesapeake Bay TMDL December 2010 Overall Pollution Diet Established Additional Removal Required 25% N 24% P 20% SS

3 Background Reductions from 2009 levels Agreed to by Commonwealth Watershed Implementation Plans (WIP I 2010: WIP II completed in March 2012) MS4s Assigned Waste Load Allocation Achieved over 15 years: 3- five year permit cycles Phased Approach To Reductions: 5% First Permit Cycle (2018) 35% Second Cycle (2023) 60% Third Cycle (2028)

4 VDEQ Guidance Document Guidance Memo No August 2014, revised March 2015 Cook Book Approach Very prescriptive on submittal requirements Allows Flexibility in Plan Development and Compliance. 1. Determine Extent of MS4 Regulated Lands, Loads and Required Reductions; 2. Adjustments to Loads 3. Develop Plan to Meet Reductions; 4. Review of MS4 Authority and Implementation Capabilities; 5. Expected Schedule and Costs for meeting the Action Plan; and, 6. PUBLIC INPUT

5 Urbanized Area Expanded from acres based on 2010 Census

6 MS4 Regulated Area Regulated Area A conveyance or system of conveyances designed or used for conveying stormwater. Owned or operated by City, Town, County with ESC and stormwater authority

7 Regulated Area Urbanized Area 3075 Acres Regulated Area 147 Acres

8 MS4 Regulated Area Summary Land Use Category Acreage Wetland 5.16 Open Water 0.10 Forested 2.24 Industrial Permitted Lands 0.00 Pervious Impervious* Total Area** *Includes 16.9 acres VDOT Impervious lands **Includes 28.7 acres of VDOT roadways and right of way

9 Reductions Required For 1st Permit Cycle Pollutant Source Total Acres Served by MS4 First Permit Cycle Required Reduction in Loading First Permit Cycle Reduction Required (lbs) First Permit Cycle Total Reduction Required (lbs) Nitrogen Phosphorus Total Suspended Solids Regulated Impervious Regulated Pervious Regulated Impervious Regulated Pervious Regulated Impervious Regulated Pervious

10 Required Pollutant Removal Pollutant Total Nitrogen (TN) Total Phosphorus (TP) Total Suspended Solids (TSS) 1 st Permit Cycle 2018 Required Removal (lbs/year) 2nd Permit Cycle rd Permit Cycle 2028 Total

11 Loading Reduction and Credit Adjustments Credit for BMPs constructed after 2009 beyond required capacity - NO Additional removal required for Grandfathered projects NO Credit for stricter development standards - NO Credit for BMPs constructed from if County Reports Historic Data -YES Carrolton BMP #5 Pollutant Removal (lbs) N P SS- 3047

12 County Loading Reduction Options Evaluated BMP Review Existing BMP s and opportunities for retrofits and conversions; Focus on County owned parcels inside and outside of Urbanized Area. Other TMDL watersheds; Land Use Conversions and Nutrient Management Planning Credit Exchanges Future Approved BMPs (Stream Channel Stabilization)

13 Potential Projects Structural BMP s Nike Park Bioretention Facility Windsor High School -6 Bio-retention Facilities Carrolton Volunteer Fire Department Wetland Expansion Poor House Road Facility Land Use Conversion Rescue Squad Parcel Landfill Parcel Nike Park Buffer Expansion Nutrient Management Windsor High School County Court House Complex Nike Park

14 Projects, Costs and P Loading Removal Rates Project P Removal (lbs) Project Cost Cost/lb P Carrollton Fire Station BMP # $ 34,358 $ 38,600 Windsor High School $ 441,000 $ 42,000 Nike Park Bio-retention 4.26 $ 160,600 $ 37,700 Poor House Road BMP $ 313,351 $ 30,000 Land Use Conversion 9.8 $ 244,800 $ 25,000 Nutrient Management Plans 1.53 N/A N/A DEQ Local Assistance Program Provides 50% Funding for Projects < $50,000/lb Proposed DEQ Plan Elements

15 Proposed Plan to VDEQ Pollutant 1st permit Cycle Required Reductions (Lbs) Windsor High School Nike Park Carrolton BMP #5 Total Removal All Projects Total 2028 Removal Required N P SS

16 MS4 Regulated Area

17 Potential P Reductions Required from Total Urbanized Area Pollutant Area Source Acreage Phosphorus MS4 Regulated Area Total Urbanized Area Impervious 43 Pervious 97 Impervious 368 Pervious 1254 Total Reduction Required (lbs) Total all projects in DEQ Plan Total of All Projects Identified 22 44

18 Future Uncertainties Loading Reductions for Remainder of Urbanized Area Future Chesapeake Bay Model and Additional Reductions Growth-- Expanded Urbanized Area VDOT-- Individual Phase II Permit Other TMDL Action Plans

19 Next Steps The County is seeking public comments on the proposed plan until June 19, A link to this presentation and the full TMDL Action plan can be found on the County Stormwater Page: Written comments can be submitted to: stormwater@iwus.net or via mail at Isle of Wight County ATTN: Stormwater Division PO Box 80 Isle of Wight, VA 23397