Resolution_PFacilitiesAgmt2022_City of Roslyn

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Table 1: Alternatives Analysis v Tf'P A' i-.lh2y`v_�r,:,. J. r ry �S4-.�a'�0:PI ¢ ii�'��iR1B8}17rF I �aCr,slll73Sr1{��I.tC 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 swaies to ❑ Impacts roadside parking existing storm sewer 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 duality 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 altemative. 4 — Detention Basin wl ❑ 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 alternative. 6