University of Washington – Parking Lot Regrading & ADA Parking Design

Improving Accessibility. The University of Washington needed to improve ADA stalls, traffic flow, drainage, and curb ramps at some of its busiest parking lots across campus to make coming and going a smooth transition.  Reid Middleton provided engineering services for over 30 parking lots throughout the University of Washington campus. Our team helped university staff identify existing barriers and non-compliant features. Field measurements were taken to document existing grades, slopes, pavement condition, and barriers along the accessible route from parking areas to building access points. Preliminary design concepts were developed for each location, including multiple design alternatives for some locations. Alternatives included evaluation of stormwater improvements, adjacent opportunities for LID/bioretention facilities, potential permitting requirements, and preliminary construction cost estimates.

One of the parking lots that was reconfigured was Parking Lot N22 and surrounding walkways and roads. Parking lot N22, which has 40 parking stalls, needed to comply with ADA requirements and provide vehicle charging stations. The project efforts included grading, TESP, pervious pavement, drainage, ADA improvements, landscaping, lighting, and vehicle charging stations. Stormwater quality requirements were met by using pervious concrete pavement throughout the lot. Soil infiltration testing was performed, followed by stormwater calculations using WWHM for the infiltration system. We designed stormwater conveyance systems, prepared a SWPPP, and conducted an upstream and downstream analysis. Full PS&E was provided, including permitting services for the City of Seattle and the Drainage Report.

The second part of this project included improvements of a group of parking facilities to meet the current ADA standards and requirements. The scope of work for these parking facilities varied from site to site, including regrading and repaving, pavement overlay, access path improvements, or parking restriping and signage improvements. The Reid Middleton team performed site investigations and assessments, developed and evaluated improvement solutions, prepared bid and construction documents, and provided construction administration services.