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EE/CA & Action Memorandum, Fairchild AFB & City of Airway Hgts.

Client: USACE Seattle

Location: Fairchild AFB, WA

Scope of Work:

  • Engineering Evaluation/Cost Analysis
  • Action Memorandum
  • Public Meetings
 

Brice through its joint venture (JV), Brice-AECOM JV1, completed a hydrogeologic study, engineering evaluation/cost analysis (EE/CA), and an action memorandum (AM) for a CERCLA non-time critical removal action (NTCRA) for PFOS and PFOA in the City of Airway Heights (COAH) drinking water on behalf of the Fairchild AFB. Site investigations at FAFB detected PFOS/PFOA in groundwater and PFOS/ PFOA have been detected in the COAH’s municipal supply wells. Immediate temporary measures were taken; however, a longer-term supply of clean drinking water to residents and businesses is needed. Brice-AECOM completed a hydrogeologic study to identify an alternate source of drinking water as well as developed and evaluated alternatives for mitigating impacts to Airway Height’s drinking water and facilitating public meetings. We completed the work in accordance with CERCLA and EPA guidance.

Brice-AECOM reviewed available data for municipal supply wells and prepared a technical memorandum identifying data gaps to be addressed to complete the EE/CA. We prepared and submitted an EE/CA Approval Memorandum. The hydrogeologic study consists of evaluating aquifer conditions, evaluating the feasibility of alternate water supply locations, including documenting existing water rights and potential impacts, GW modeling, and reporting. We developed removal action objectives (RAOs), presented Applicable or Relevant and Appropriate Requirements (ARARs), screened remedial technologies, and developed and evaluated alternatives for mitigating impacts to Airway Height’s drinking water from groundwater contaminated with PFOS and PFOA.

This complex project involved multiple regulatory stakeholders. Brice-AECOM promptly engaged stakeholders in work planning meetings and built consensus on a path forward.

Performance Highlights

  • Received all “Exceptional” and “Very Good” CPARS ratings on Interim CPARS dated 1/14/2020
  • To expedite the project schedule and facilitate consensus amongst stakeholders, our team de-scoped submittal and review of a project work plan and replaced with work planning meetings

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