Pursuant to the State Water Resources Control Board Order WQ 2019-0005-DWQ and in response to a directive from the Santa Ana Regional Water Quality Control Board (SARWQCB), during December 2019 and January 2020 NV5 conducted a per- and polyfluoroalkyl substances (PFAS) assessment at the Ontario International Airport. The assessment, as outlined in the NV5 Work Plan and approved by the SARWQCB, included the advancement of ten soil borings for collection of soil matrix samples within two areas of the airport where PFAS impacts may have occurred based on historical use as a shooting range and fire-fighting training area. The assessment also included laboratory analysis of soil matrix and groundwater samples for PFAS analysis in accordance with Department of Defense (DOD) Quality Systems Manual (QSM) version 5.3, preparation of a Preliminary Site Investigation Report, and collection of groundwater samples from six groundwater monitoring wells associated with the downgradient GE Company – Jet Engine Test Cell Facility. Several shallow soil samples exhibited concentrations of perfluorooctanoic acid (PFOA), perfluorooctane sulfonic acid (PFOS) and other PFAS compounds. Concentrations of PFAS compounds were detected in groundwater samples. Groundwater samples were also analyzed for general chemistry analysis.
