Full Text
Salem Willows Phase 2 Improvements Salem Conservation Commission NOI Hearing June 20, 2023 Rob Kenneally, PE Matthew Pilis, PLA ---PAGE BREAK--- Conservation Commission Project Area ---PAGE BREAK--- Conservation Commission ---PAGE BREAK--- Conservation Commission Coastal Resource Areas ---PAGE BREAK--- Conservation Commission Resource Areas UPDATE ---PAGE BREAK--- Conservation Commission Source: Google Earth, June 20 Impacts from Use Project Area Proposed Pier ---PAGE BREAK--- Conservation Commission Existing Site Photos Inaccessible picnic areas, with some picnic tables currently sitting on tree roots. Inaccessible, oversized and undefined pathways and site circulation. Excessive impervious surfaces lead to uncontrolled stormwater runoff and concentrated flows. Degraded and compacted softscape areas along coastal edges. ---PAGE BREAK--- Conservation Commission Existing Site Photos Large paved expanse leading towards sink holes along edge of existing seawall. Oversized and undefined gateways and access points within the project site. ---PAGE BREAK--- Conservation Commission Project Goals Restore the Site • Improving pedestrian circulation, adding new pedestrian paths, and reducing impervious surfaces. • Installing bioretention basins. • Re-grading and improving existing picnic areas. • Restoring degraded areas with native trees, shrubs, and groundcovers. Project Goals ---PAGE BREAK--- Conservation Commission Site Plan ---PAGE BREAK--- Conservation Commission Impervious Surface Comparison Existing Conditions Plan Proposed Site Plan Impervious Surface = 31,752 SF Impervious Surface = 21,152 SF Impervious Surface Reduction = 10,600 SF or 33% Reduction ---PAGE BREAK--- Conservation Commission Stormwater Management Best Management Practices (BMPs) Bioretention Basins ---PAGE BREAK--- Conservation Commission Stormwater Management Best Management Practices (BMPs) Flexible Porous Pavement ---PAGE BREAK--- Conservation Commission Bioretention Basin Flexible Porous Pavement Stormwater Management Best Management Practices (BMPs) ---PAGE BREAK--- Conservation Commission Subcatchment Plan - Existing Condition Three Discharge Points Limit of Work Area: 1.55 acre Drainage Area: 1.75 acre ---PAGE BREAK--- Conservation Commission Subcatchment Plan – Proposed Condition Three Discharge Points Limit of Work Area: 1.55 acre Drainage Area: 1.75 acre ---PAGE BREAK--- Conservation Commission Stormwater Management Compliance • Redevelopment Project • Reducing Impervious (Paved) Surfaces ― 34% reduction in impervious area • Reducing Peak Stormwater Flows ― Post-development < Pre-development • Recharge Volume & Water Quality ― Providing MS4 (0.8”/sf) required recharge volume • Operation and Maintenance ---PAGE BREAK--- Conservation Commission Planting Strategy 1. Continued Planting approach from the Phase 1 Project. 2. Restoration planting (Maritime Shrubland) limited to coastal areas for stabilization and climate change resilience. 3. Creation of a native Bioretention Basin Plant Community. 4. Native, Non-cultivar Species 5. Highly Adaptive Plants– Minimize Maintenance. ---PAGE BREAK--- Conservation Commission Timeline and Next Steps • Community Outreach – Parks & Recreation Hearing: July 2023 • Complete Design/Construction Documents: Fall 2023 • Out to Bid: Anticipated Spring 2024 • Construction: Anticipated 2024 - 2025 ---PAGE BREAK--- Conservation Commission Thank You