Triangle has extensive public involvement experience within many sectors, including:
- Water, Wastewater and Stormwater – including establishing new wastewater treatment systems, facility siting, water supply, low impact development, combined sewer overflows, and infiltration and inflow.
- Transportation – including highways, mass transit, railroads, and airports.
- Environmental Review – from scoping to approval, DNS to EIS, NEPA, SEPA, and SERP.
- Solid and Hazardous Waste – including rebuilding transfer stations, siting intermodal facilities, hazardous waste remediation, and master facility plans.
Featured Projects include:
Port Hadlock Wastewater Planning
Seattle Public Utilities
SR 17 & SR 282 Widening Project
Seattle Shoreline Master Program
Expert in an array of skills and techniques, Triangle crafts a tailored approach that meets the unique needs of each client.
Triangle’s role was to develop and implement a strategy to ensure broad, fair public participation and clear communication about the Port Hadlock UGA sewer planning process. 
SPU asked Triangle design a public outreach and information strategy to involve citizens and other stakeholders in the development of the Solid Waste Facilities Master Plan.
Triangle’s role on the project team led by David Evans Associates was to conduct stakeholder interviews and to develop and implement a public information/public involvement program.
For the first time since 1987, the City of Seattle's Department of Planning and Development (DPD) is updating its Shoreline Master Program (SMP), the policies and regulations governing development and uses on and adjacent to marine and freshwater shorelines.