Sound Transit Biddingo #RP 0202-20

Sound Transit South Link Light Rail Extension: Stormwater, Parking Garage, and Utility Construction

This opportunity involves Sound Transit's South Link Light Rail extension in SeaTac, Washington, with a focus on major infrastructure and site development: - Government Buyer: Sound Transit (regional transit agency for the Seattle metropolitan area) - Project Scope: - Construction of stormwater flow control facilities, including detention pipes and infiltration trenches for four Threshold Discharge Areas (TDAs) - Installation of a stormwater conveyance system with new and existing pipes and subsurface drains sized for 25-year peak flows, meeting City of SeaTac standards - Construction of a seven-story parking garage on a 3.82-acre lot, including associated plaza, retail space, and utilities - Implementation of water quality catch basins with media-filled filter cartridges and bypass structures - Sanitary sewer and water utility improvements, including new lines, mains, manholes, and cleanouts per local requirements - No specific OEMs or commercial vendors are named in the documentation - Notable Requirements: - All stormwater and utility systems must comply with City of SeaTac and King County standards - Soil and groundwater conditions (silty, gravelly sands; groundwater at 19.5–60 feet) must be considered in design and construction - Flow control and water quality facilities must be tailored to the four identified TDAs - Parking garage includes both transportation and commercial/retail elements - The procurement is for construction and civil engineering services, with a strong emphasis on environmental compliance and integration with transit infrastructure

Description

Sound Transit is soliciting proposals for a transit-oriented development project at the Angle Lake North TOD Site in SeaTac, WA. The project involves developing affordable housing on an approximately 33,500 square foot property located at the northeast corner of S. 200th Street and 26th Avenue S. The development must comply with State Statute RCW 81.112.350 and Federal Transit Administration regulations due to the property's federal funding. Sound Transit prefers a ground lease but will consider a sale if warranted. Proposals should be concise, with finalists potentially asked for more detailed submissions. A pre-proposal meeting will be held to discuss the RFP, schedule, scope, and contract elements.

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