Geosyntec began work at a circuit board manufacturing facility (Site) in May 2012 as a subconsultant tasked with; 1) technical/field support for the assessment of chlorinated volatile organic compounds (CVOC); 2) identification of a "treatment" zone for targeted CVOC remediation; 3) selection of a remedy for impacted groundwater and generation of a Remedial Action Work Plan (RAWP); and 4) implementation of the RAWP.
Completion of these tasks was challenging due to the depth interval of contaminated groundwater at approximately 188 to 245 feet below land surface (ft bls), and the Client's goal of having a remedy in place by September 2013. Geosyntec used CVOC assessment data and 3-dimensional modeling software to generate a conceptual Site model that facilitated the resolution of data gaps, the identification of a target treatment zone, and the selection of injection well spacing. The RAWP utilized an 83-injection well network, which was installed from March through May 2013, and a biostimulation/bioaugmentation injection of ~28,000 gallons of diluted potassium lactate, ~400 L KB-1, ~190,000 gallons of diluted EOS PRO, and ~137,000 gallons of anaerobic chase water (completed from June through August 2013). Implementation the RAWP was met with significant challenges including raw material storage/preservation, generation of anaerobic mix water, injectate quality control, site control, personnel health and safety, and progress communication to the Client. Adjustments for lessons learned allowed for RAWP activities to be completed safely, attaining design goals, and meeting the Client's aggressive schedule for remedy implementation.