Resolution_City of Roslyn_PF Funding Award Agmt

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Table 1: Alternatives Analysis Alternative Description Discussion / Recommendation 1 — Biofiltration Swales ❑ Construct biofiltration ❑ Provides runoff treatment for public swales adjacent to paved right-of-way roadways ❑ Provides minimal flow control benefit ❑ Connect underdrains and ❑ Designs require consideration of cold overflow bypass from climate biofiltration swalesto existing stormrm sewer sew ❑ Impacts roadside parking network ❑ Designs can have minimal impact on the landscape with the appearance of open roadside ditches ❑ Considered the preferred alternative in areas with storm sewer 2 — Vegetated Filter ❑ Construct vegetated filter ❑ Provides runoff treatment for public Strips strips adjacent to paved right-of-way roadways ❑ Provides minimal flow control benefit ❑ Design can be used in unsewered areas ❑ Designs can have minimal impact on the landscape ❑ Impacts roadside parking ❑ Considered the preferred alternative in unsewered areas 2 — Oil Water ❑ Construct and connect oil ❑ Low water quality benefit as traffic Separators (OWS) water separators to the usage on roadways does not warrant storm sewer installation of OWS ❑ No flow control benefit ❑ Not considered the preferred alternative. 3 — Pervious ❑ Construct new pervious ❑ Provides runoff treatment and limited Pavement pavement flow control ❑ Demolish existing pavement ❑ Unable to infiltrate with poor soils ❑ Connect underdrains to ❑ Construction would cause significant existing stormwater sewer disruption to neighborhood system ❑ Not considered the preferred alternative. 4 — Detention Basin w/ ❑ Use underground ❑ Provides runoff treatment and flow Filter Cartridges engineered filter systems to control provide water quality ❑ Filter cartridges are a large capital treatment cost and large annual maintenance cost ❑ Scalable treatment provided at existing collection points or central treatment location ❑ Not considered the preferred afternative. 5