The University of Rhode Island Porous Asphalt Parking Lots
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1 The University of Rhode Island Porous Asphalt Parking Lots NEMO U 5 Middletown, CT October 17, 2006 Lorraine Joubert and Lisa DeProspo Philo University of Rhode Island Cooperative Extension Nonpoint Education for Municipal Officials In partnership with the RI HEALTH Source Water Assessment Program
2 Today s Topics About the URI Porous Pavement Parking Lots Water Quality Monitoring Results Maintenance Requirements
3 University of Rhode Island, Kingston Two Porous Asphalt Parking Lots Built Fall 2002 & Full use since Fall 2004 with student and event parking. 800 vehicle lot at Plains Road (Ryan Center) 5.5 acres 200 vehicle lot W. Alumni Ave (Dairy barn) 1.5 acres.
4 Factors in Selecting Alternative Pavement RI NEMO source water assessment estimated wellhead area 40% impervious Need to reduce runoff, maintain groundwater recharge. Cheaper than parking garage. Porous Pavement Parking Lots
5 Practical Benefits Cost comparable by avoiding closed drainage system, topsoil use. Space savings by eliminating surface stormwater treatment Winter snow and ice usually melt and drain more easily Improvement of wet pavement skid resistance Pedestrians and motorists do not have to contend with large puddles
6 A Note About Costs Typical porous pavement averages $2,200 to $2,750 per parking space.
7 Site preparation is critical! Remove silt and replace with crushed rock
8 Crushed Rock Provides: Stability to asphalt Proper drainage Large storage area for infiltrating water
9 Porous Pavement Design Cross Section Porous Asphalt layer (2.5 ) Choker Course (1 or more) Clean, uniformly-graded coarse aggregate Geotextile filter fabric Un-compacted subgrade Source: Beta Group, Inc., Cahill Associates, Carol R. Johnson Associates Inc., and Antonio P. Franco & Associates Electrical Engineers, 2002.
10 Island Features Serve as bioinfiltration areas Provide secondary infiltration route during intense rainfall and in case of surface clogging 6 risers with clean-out and overflow grates
11 Does it work? Compare!
12 Today s Topics About the URI Porous Pavement Parking Lots Water Quality Monitoring Results Maintenance Requirements
13 Four Monitoring Locations for Stormwater Infiltrate 3 stations within lot 1 control station north of lot Research by T. Boving, M. Stolt and J. Augenstern funded by URI Transportation Center
14 Stormwater Infiltrate Monitoring Results None Detected: Bacteria BOD Lead Low Level PAH Zinc and copper 90% retention Higher Levels Winter Chlorides Spring Nitrates & Phosphorus
15 Issues With Monitoring Results Contaminants might not have migrated to sample port depth Main problem geotextile fabric prohibiting infiltration resulting in: Channeling along fabric to seams, with preferential infiltration. Lack of samples, Reduced pollutant retention.
16 General Performance In some areas: Fine sand clogging asphalt Surface wear and tear
17 Additional Observations Snow stockpiled in corner of lot reduced infiltration due to sands Wheel stops moved by plow Meadow grasses planted in bioinfiltration areas were high maintenance and eventually mowed Some signs of surface clogging in new lot.
18 Today s Topics About the URI Porous Pavement Parking Lots Water Quality Monitoring Results Maintenance Requirements
19 Preventing Clogging
20 Preventing Clogging Vacuum pavement 2 times/year with commercial unit. Do not use brush/wash or compressed air units. Maintain planted areas near pavement to avoid bare soil or washouts. Mow vegetated islands at least annually. Do not cut to a height less than 4 inches. Remove litter. Immediately clean any soil or mulch deposited on pavement. Where possible, avoid wind-blown silt from nearby agricultural fields and construction sites. Clean inlets draining to subsurface twice/year. As recommended by Cahill Associates, environmental engineering firm
21 Winter Maintenance
22 Winter Maintenance No sanding. No sodium chloride allowed due to wellhead. Use magnesium chloride. Raise plow blade 1 higher than normal. Do not stockpile snow on pavement. As recommended by Cahill Associates, environmental engineering firm
23 Design Changes with New Lot Fewer, wider infiltration islands Curb cuts for water entry to island bioinfiltration areas Mowed grass, not meadow grasses for islands Fewer wheel stops, where possible
24 Additional Recommendations Hire contractor with specialized expertise in permeable pavements for design and field inspection. Test asphalt mix at time of delivery. Verify maintenance plan is followed and modify as needed. Investigate use of more permeable geotextile fabric. Consider retaining some silt below crushed rock bed or augmenting coarse subsoil for improved pollutant attenuation. Consider using rumble strips at entries to lots to help remove sediment and debris from entering cars. Investigate use of updated asphalt mixture that uses the polymer Styrene-Butadiene- Styrene.
25 If you d like more info Go to: Click on: URI Nonpoint Education for Municipal Officials / Publications Lorraine Joubert ljoubert@uri.edu Tel: Lisa DeProspo Philo lphilo@uri.edu Tel:
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