This project installed and will monitor permeable pavement for durability, water quality (influent and effluent), and infiltration rates. RKI assisted the City of Spokane with research on successful monitoring practices and lessons learned by other jurisdictions and provided design review and recommendations for final design, construction, monitoring, operation and maintenance.

RKI is providing permit support, development review, engineering standards updates, and stormwater management planning for the Seattle-Tacoma International Airport (STIA) under the Port of Seattle’s Indefinite Delivery Indefinite Quantity (IDIQ) Environmental Review and Permitting Services contract. Recent tasks include development of the STIA LID Guideline for compliance with the Airport’s NPDES Individual Permit and Federal Aviation Administration requirements for commercial airport operations, planning for regional infiltration facilities, and assistance with Port policies and strategic goals.

In response to Ecology’s reissuance of the National Pollutant Discharge Elimination System (NPDES) Phase II Municipal Stormwater Permit, the City was required to update their Stormwater Management Manual (SWMM) to make Low Impact Development (LID) the preferred and commonly used approach to new and redevelopment. RKI provided on-call engineering services to assist with implementing the updated SWMM and provided development review support.

RKI provided on-call services to assist with implementation of the City’s 2016 update of their engineering standards, including new requirements for Low Impact Development (LID), and provided technical support for compliance with the western Washington Phase II National Pollutant Discharge Elimination System (NPDES) permit.