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HomeMy WebLinkAboutPresentationCompleted 2023 Current Scope End of 2024 •Field Assessments and ranking of stormwater retrofit sites •Curve Hill Road •Standish Way •Lake Road West •Baker Ave •Grove Street •Curve Hill Road •Standish Way Inventory of Sites •Curve Hill Road •Standish Way Final Design and Construction Bidding 25% Design and Public Meeting 75% Design and PermittingCompleted 2024 Yarmouth Stormwater Project Improving Water Quality Presenter Name Standish Way Stormwater Retrofit Public Hearing Yarmouth Conservation Commission MassDEP File No. SE 083-2451 October 3, 2024 *Funding for this work has been provided by Massachusetts Office of Coastal Zone Management Coastal Habitat and Water Quality Grants. Future funding will also be provided by USDA Natural Resources Conservation Service in coordination with the Cape Cod Conservation District. agenda 1.Project Goal 2.Existing Conditions/Resource Areas 3.Proposed Conditions 4.Resource Area Impacts Project Goal To improve coastal water quality by reducing or eliminating pollution (bacteria and nitrogen in particular) from stormwater runoff 10 Priority Sites Advanced 5 Sites: •HIH-3 Grove Street •MC-3 Standish Way •MC-5 Baker Ave •PR-3/4 Lake Rd West •UBR-4 Curve Hill Road •Total Drainage Area = 2.8 acres •48% Impervious (1.33 ac) •Existing SW management •Underground Gravel Wetland •Porous Asphalt •Infiltration Trench •Leaching Catch Basins Overall Existing Conditions •Total Drainage Area = 1.5 acres •40% Impervious (0.65 ac) •Residential and Commercial Land Use MC-3 Standish Way Existing Conditions Colonial Acres Beach Parking Lot Existing Conditions •Town Road and Parking Lot (Colonial Acres Beach) •Existing asphalt sidewalk •Existing Stormwater Infrastructure •Porous Asphalt •Infiltration Structures •Underground Gravel Wetland •Shallow depth to groundwater •Salt Marsh/Tidal River along Mill Creek/Lewis Bay •200-ft Riverfront Area (green dashed line) •Land Subject to Coastal Storm Flowage (LSCSF) EL – 11 Resource Areas •Infiltration Trench and Bioretention area for Treatment (0.36 ac imp) •DA1C runoff treated by existing Underground Gravel Wetland MC-3 Standish Way Proposed Conditions Colonial Acres Beach Parking Lot •Infiltration Trench and Bioretention for Treatment •Overflows continue down road •Porous asphalt sidewalk Standish Way - Design Components Colonial Acres Beach Parking Lot Resource Areas Colonial Acres Beach Parking Lot •200-ft Riverfront Area (green dashed line) •Land Subject to Coastal Storm Flowage (LSCSF) EL – 11 Coastal Resource Area Impacts Resource Area Impacts Nature of Impact Temporary Permanent Coastal Flood Zone (LSCSF) (el. 11’)3,100 SF 2,600 SF Bioretention Area, Infiltration Trench, Timber Wall, Porous Pavement 100-200-foot Riverfront Area 640 SF 350 SF Bioretention Area, Porous Pavement Resource Area Impacts The proposed project will improve conditions: •Project components improve the ability of resource areas to perform their function to protect the interests of the state and local wetland regulations. The project is restorative in nature and will provide an overriding public, environmental, and health benefits through the improvement of the water quality in Mill Creek/Lewis Bay. Thank You! Questions?