King County International Airport Core Area Redevelopment

Hart Crowser conducted AAI and ASTM standard Level I and Level II Environmental Site Assessments (ESAs), Model Toxics Control Act (MTCA) risk assessments, and feasibility studies at King County International Airport to support redevelopment of a 21-acre property. The site had an active airport hangar, offices, support buildings, and was a former fuel farm, gas station and aerospace manufacturer. The property is located within the Duwamish Valley adjacent to active runways and taxiways.

We developed and executed a soil and groundwater sampling plan that worked around the active site and workers. We helped King County develop cleanup options and cost estimates that fit their available funding, including EPA funds. We prepared a Cleanup Action Plan (CAP) and plans and specifications for the selected cleanup (petroleum and chlorinated solvent soil removal and chemical oxidation), and also provided construction oversight during remedial action to assure compliance with MTCA for site closure.

King County Core Area