Groundwater Remediation at a Former Rocket Testing Site

The lead consultant for the strategic planning and management of a regional groundwater remedy at the site, M&A has supported an in situ bioremediation system to treat perchlorate since 2008. This work entailed designing and testing extraction and injection wells, tracer testing, modeling groundwater flow and contaminant transport, monitoring, and reporting. Our role recently expanded to oversee remedy expansion and optimization and to develop a new regional groundwater model.

Overview

This regional plume associated with this site threatens numerous public water supply wells. The contaminants of concern include perchlorate and VOCs, primarily TCE. Boeing currently operates two pump-and-treat systems at about 3,000 gpm.

Services

Strategy-level services include project planning, cost forecasting, and cost management. We also serve as the technical liaison to large stakeholder group and manage or conduct a range of analyses to ensure remedy effectiveness and regulatory compliance.

Groundwater Remediation

  • Managed well drilling and design, data analysis, and reporting
  • Completed a site-wide feasibility study (FS) and remedial action plan (RAP) for the lead regulatory agencies (Department of Toxic Substances Control and Regional Water Quality Control Board)
  • Completed interim RAPs for individual operable units
  • Directed the successful completion of an in situ biotreatment remedy for perchlorate in the primary source area
  • Prepared a 5-Year Review report
  • Managed the final phase of an expansion of the monitoring network and remedy to increase capture and optimize operations
  • Developed comprehensive database of groundwater level and water quality data from over 600 wells nested within 200 boreholes

Groundwater Modeling

  • Conducted vadose zone modeling to assess source areas
  • Developed and calibrated a multi-layer, transient, flow-and-transport model using MODFLOW, MT3D, and MODPATH to assess the feasibility of a pump-and-treat groundwater remedy for the site

3D Geologic Modeling

  • Constructed a new model for managing and optimizing the long-term groundwater remedy that will incorporate a 3D Leapfrog model and data from over 3,000 wells

Permitting & Compliance

  • Managed a compliance monitoring and reporting program
  • Obtained waste-discharge permits for the source control remedy and ensured permit compliance