Presented by Dani Wise Johnson Vanasse Hangen Brustlin, Inc.

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1 Incorporating LID Stormwater Management Practices and Ecological Restoration on Redevelopment Properties Presented to LID Conference Philadelphia, Sept 2011 Presented by Dani Wise Johnson Vanasse Hangen Brustlin, Inc.

2 Considerations for Stormwater Management on Redevelopment Properties Site-specific issues and treatment options Design not one size fits all Extensive site investigations required to properly address site characteristics (drainage patterns, soils, contaminants, ground water, etc) Challenges related to stormwater treatment Limited infiltration opportunities (soils) Land cost high Physical lack of space Existing soil/groundwater contamination

3 Considerations for Ecological Restoration on Redevelopment Properties Site-specific issues and restoration options Design not one size fits all Extensive site investigations required to properly address site characteristics (drainage patterns, soils, contaminants, ground water, etc) Challenges related to restoring streams, wetlands, and other habitats Land cost high Physical lack of space Existing soil/groundwater contamination Funding for such projects

4 Approach: Integrated Stormwater Management Practices Master Planning Look for opportunities to implement run-off capture/treatment and re-use in planning stages Utilize a Tiered Approach if necessary/possible Utilizing more than one practice for additional treatment, particularly when infiltration into groundwater limited Landscaping as Infrastructure Carried over into the restoration/creation of ecologically sensitive areas: stream corridors, wetlands, riparian buffers, etc. Green Fingers Requires Planners, Engineers, and Environmental Scientists to work TOGETHER

5 Supports Ecological Restoration Efforts Meets Regulatory Requirements Current and Future Low Impact Development Stormwater Management Practices Considers Site Constraints Utilities, Roads, Buildings Improves Site Aesthetics Consider End User and Marketability

6 University of Delaware: Science and Technology Campus (STC) Previously a Chrysler Plant (~ ) Over 80% Impervious Adjacent University properties include College of Agriculture & Natural Resources Christina River Watershed, Newark, DE Piped perennial stream across property Brownfields site 50 Year Master Plan

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8 STC Stormwater Considerations Existing Condition: Site predominately impervious Little known about existing infrastructure (underground utilities) Very low time of concentration during storm events Need to address existing and upcoming stormwater regulations as site Master Plan is developed Stream daylighting options need to incorporate stormwater practices Results of Brownfields investigation will influence location and design of practices

9 Silver Brook today..

10 Status of Evaluation of the Daylighting of Silver Brook Analyzed historical conditions and available data Appreciation for previous condition of Silver Brook and its significance in the landscape Conducted site visit to assess current conditions of stream on the STC; also visited the upstream and downstream portions of the drainage Met with Water Resources Agency/Stakeholders to discuss their knowledge of the watershed, relevant data they have available, and potential for funding sources for restoration Evaluate the pro & cons of daylighting or not daylighting the channel Coordinate efforts with the Brownfields investigation to aid in conceptual plans for stream and floodplain placement

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12 Considerations for Daylighting Silver Brook Provide green-space within the STC Create visual barrier between E & W Create aquatic and terrestrial habitat Create floodplain providing various storm water treatment options Create area for recreation and greenway Improve water quality Provide location for various research opportunities for UD Faculty and students Cost of restoration, particularly with risk of contaminated soil treatment/removal Cost related to stream crossings (auto and pedestrian) 100yr floodplain - regulated

13 Considerations of not daylighting Silver Brook Stream would remain in culvert on property No constraints related to 100 yr floodplain boundary Property more accessible No greenspace onsite/connection to off-site parks Disappointment of local citizens Require all storm water treatment occur in other areas on property Potential issues with integrity of existing culvert

14 Expanding on Ecological Aspects Re-opening the piped channel restores a once free-flowing stream and vastly improves the ecological condition of the stream itself as well as the adjacent landscape Provides a sink for sediment, nutrients and other pollutants entering the drainage upstream of the STC. In support of UD Climate Action Plan and Sustainability goals Connects the green-space to the north (Prichard Park) and to the Christina River riparian area (Rittenhouse Park) to the south Improves the water quality of Silver Brook prior to its confluence with the Christina River ( trout fishery) - 303d listed river with TMDLs in place

15 University of Delaware School of Agriculture Science and Technology Campus University of Delaware Athletics

16 Dickey Park LID and Ecological Restoration in Redevelopment West Park Place Elementary Lewis Park White Chapel Park Phillips Park University of Delaware School of Agriculture Devon Park Science and Technology Campus University of Delaware Athletics Christina Creek Robscott Manor Rittenhouse Park

17 Dickey Park LID and Ecological Restoration in Redevelopment West Park Place Elementary Lewis Park White Chapel Park Phillips Park University of Delaware School of Agriculture Devon Park Science and Technology Campus 100 Floodplain University of Delaware Athletics Christina Creek Robscott Manor Rittenhouse Park

18 Master Plan Stormwater Management/Ecological Restoration Integration of innovative stormwater practices throughout the STC can offer multiple benefits Incorporate BMPs into landscaping rather than set aside valuable real estate for large scale (regional) approaches Naturally lends itself to creating these green corridors or fingers If soil contamination is an issue in a particular area, stormwater facilities can be installed to prevent mixing with groundwater Opportunity for incorporation of newly designed practices and monitoring for research and learning opportunities Needs to allow for PHASED DEVELOPMENT but with whole site plan in mind Sustainability Approach UD Path to Prominence

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27 PRECEDENTS: STORMWATER STREETSCAPES

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33 DNREC Stormwater Management Regulations City of Newark is the Delegated Agency for most UD projects DNREC is Delegated Agency for S&TC because it is in the Brownfield Program Current Regulations: Quantity: post-development peak cannot exceed pre-development peak for 2, 10 and 100 year frequency storm events Quality: 80% TSS removal as modeled by the Delaware Urban Runoff Management Model (DURMM) Impact on Redevelopment: no quantity management required if reducing impervious, quality management required for all runoff

34 Proposed Regulations (Draft, implemented 2011?) Quantity: Volume control for Resource Protection (1 yr), Conveyance (10 yr) and Flooding (100 yr) Events (promoting recharge and infiltration of 1 year storm) Quality: 80% TSS removal and Nitrogen and Phosphorus reductions consistent with receiving watershed s TMDL requirements (using updated DURMM model) Impact on Redevelopment: As currently drafted: Redeveloped areas shall employ runoff reduction practices to achieve a 20% reduction in the effective imperviousness based on the pre-developed condition.

35 Funding Considerations Grant funding opportunities include local, state, and federal Existing TMDL for Christina River this can open up avenues for funding through EPA 319 program City of Newark securing their NPDES permit (Phase II) and as a result will be required to create and implement a stormwater management plan; Potential for a utility (fee) in the future. Possible funding through cooperation with Research at UD and Water Resources Agency Willingness to utilize more progressive storm water BMPs and emphasize sustainability will aid in securing public funding Brownfields Remediation funding

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