Stormwater Best Management Practices for Marinas and Boatyards

Transcription

1 Stormwater Best Management Practices for Marinas and Boatyards December 17, 2014 Jonathan Rivin University of Wisconsin - Extension Solid and Hazardous Waste Education Center

2 Environmental regulations that apply to marinas and boatyards Solid Hazardous Waste (RCRA) Water Discharge (NPDES) Hazardous Materials (OSHA) Toxic Releases (SARA) Air Emissions (CAA) Spills Reporting and Fuel Storage

3 NPDES stormwater program The National Pollutant Discharge Elimination System (NPDES) Stormwater Program regulates stormwater discharges from: Municipal separate storm sewer systems Construction activities Industrial activities

4 Marinas and boatyards requiring NPDES Stormwater Multi- Sector General Permit (MSGP), or an individual permit: SIC codes 3731 and Ship and boat building and repair facilities SIC code (Marinas 4493) - Water transportation facilities Activities: Vessel maintenance shops (e.g. mechanical repairs, painting, fueling, and lubrication) and/or equipment-cleaning operations Crosswalk.pdf

5 Why worry about Storm Water? Runoff is precipitation not infiltrated into soil May contain pollutants that can pollute surface waters Pollutants: sediment, petroleum products, paint particles, heavy metals, etc

6 Sources of polluted runoff from marinas and boatyards Material, equipment or boat storage Scraping painting Engine maintenance Pressure washing Fuelling Waste handling Vehicle parking Site design and site management are necessary to minimize runoff pollution

7 Marinas and Boatyards Stormwater Pollution Prevention Plan (SWPPP) List significant materials on-site Provide a site map showing material locations & potential pollutant sources Identify non-stormwater discharges Identify stormwater BMPs: Source Protection BMPs Area Specific BMPs Site-wide BMPs Keep records of past spills & leaks

8 Everything you need to know about stormwater management: 1) Water runs downhill 2) Runoff carries dissolved and transported pollutants 3) Polluted runoff eventually reaches streams, lakes, oceans or groundwater

9 The key to managing runoff 1) Prevent pollution (source protection) - clean runoff can drain to surface and groundwater 2) Treat and discharge (BMPs) - polluted runoff cannot drain to surface and groundwater Caveats Every site will be different BMPs need to be tailored to each situation This requires site analysis and design

10 Analyze the site Elevations & drainage Sources of runoff & location of materials, activities Siting of BMPs Best done when its raining

11 Elevations Challenges Flat (or not) Soils Water table Pavement leading to water

12 Elevation and BMPs Remember: stormwater runs off downhill Up-gradient BMPs Reduce treatment volume and area Lower discharge elevation Can reduce downstream runoff BMPs

13 Sources of Runoff On-site contributing areas Roof drains and sheet-flow Materials and activities Off site run-on from streets and adjacent property (e.g. streets)

14 Where to put the BMPs?

15 Prevention BMPs Store materials and equipment out of the weather Locate work areas away from water

16 Cover work areas Buildings Shed Roofs Moveable covers Prevention BMPs

17 Prevention BMPs Spill containment and roofs for fueling stations

18 Treatment BMPs - Roof Water Rain gardens Cisterns

19 Roof water pipe discharge to drain field

20 Treatment BMPs - Clean Surface Runoff Grassed Swales Infiltration trenches Porous Pavement Rain Gardens Constructed wetlands: (N & P removal)

21 Clean Surface Runoff - Grassed Swales

22 Clean Surface Runoff - Infiltration Trench Weir

23 Clean Surface Runoff - Pervious Surfaces POROUS PAVERS AIR EXCHANGE TEMPORARY STORAGE INFILTRATION AGGREGATE SUBSOIL K. Potter UW-CEE Voids between pavers filled with gravel or grass

24 Clean Surface Runoff - Porous Pavements Open-Graded HMA ~ 2 ½ ½ Agg. (#57) ~ 1 2 Thick Clean Uniformly Graded 2-3 Crushed Agg. (#2) 40% Voids Non-Woven Geotextile Uncompacted Subgrade

25 Porous Parking areas

26 Pervious surface

27 Porous concrete

28 A Word About Pavement Sealcoats Do not apply over porous pavement! Coal tar-based products High in PAHs Abraded material in runoff Runoff to surface waters

29 Wet ponds/wetlands Biofiltration Proprietary devices: Oil-grit separator Swirl concentrator Treatment BMPs - Dirty Surface Runoff

30 Implementing Stormwater BMPs Marinas present challenges High value frontage Diverse activity Flat Low elevation Diffuse drainage Proximity to surface waters

31 Preferred Stormwater Management Options Avoid contact between rainfall and equipment, fuelling and work areas. Cover work and storage areas Train for best material management practices Utilize roof water, or convey to surface waters Cisterns or drains Reduce surface runoff Direct off-site, porous surfaces, vegetated swales, rain gardens Treat remaining dirty runoff Biofiltration, proprietary devices

32 Resources: Marina guides from: Wisconsin Ohio Sea Grant Vermont Facility Self-assessment Guide

33 Thank You!