Site Remediation
Site Remediation

EEC’s forward-thinking approach to remediation combined with our turnkey construction services allows us to move seamlessly from assessment to remediation. In many situations, this results in a remedial strategy that begins during the investigation stage, even before remediation is officially ordered by an oversight agency. EEC’s experts have successfully implemented and closed multiple sites through expert analysis, remedial design, implementation, and operation. EEC has always been on the forefront of new remedial techniques, while also relying on many proven approaches. Our geologists, hydrogeologists, and engineers have experience with a wide range of remedial approaches and development of the accompanying remedial action plans (RAPs). In fact, EEC has been the chief remedial engineer for the Stringfellow Superfund site for the past 3 years.

Services & Highlights
  • Soil vapor extraction
  • Dual phase extraction
  • Pump and treat
  • Monitor nature attenuation
  • In situ chemical oxidation
  • In situ anaerobic bio-augmentation
  • Air sparging
  • Excavation
  • Deed restrictions
  • Institutional controls
  • Agency negotiations


Featured Projects

Remediation of VOC-Impacted Soil, Soil Vapor, and Groundwater

Industry: Commercial Development

EEC conducted site investigations and ongoing remediation of a large scale volatile organic compound (VOC) release with tetrachloroethene (PCE) concentrations in excess of 1,000,000 µg/L.  The project location is less than 1/4 mile upgradient of a municipal drinking water well, and the VOC plume is co-mingled with a trichloroethene (TCE) and PCE plume from a downgradient former aerospace facility.

Project Highlights
  • Installation of 66 soil vapor extraction wells and operation of a 1,400 cfm soil vapor extraction system
  • Compliance with regulatory air district discharge requirements
  • Installation of groundwater monitoring well network and initiation of a groundwater monitoring and reporting program
  • Successfully delineated vertical extent of PCE-impacted groundwater, which required sealing multiple beneficial use aquifers using a sonic drill rig
  • Soil vapor investigations, risk assessments, and three-dimensional plume modeling
  • Membrane interface probe (MIP) investigation and in situ chemical oxidation injections to remediate impacted groundwater
  • Technical reporting and agency interaction

Assessment and Remediation of Chlorinated Solvent-Impacted Soil

Industry: Aerospace


EEC conducted an assessment and remediation project resulting from the termination of a long-term lease by an aerospace firm. Chlorinated solvent use was determined to be the cause of soil impacts. A fast-tracked project approach resulted in the site’s closure within 18 months.

Project Highlights
  • Phase I environmental site assessment (ESA)
  • Soil gas survey
  • Installation of multiple-completion SVE wells and system
  • Site closure within 18 months

Remediation of VOC-Impacted Groundwater

Industry: Industrial Laundry

EEC operates and maintains two groundwater treatment systems capable of operating at an extraction capacity of more than 350 gallons per minute while capturing a volatile organic compounds (VOC) plume.  More than 200,000 gallons of extracted and treated groundwater is utilized per day as the on-site plant’s operational process water.

Project Highlights
  • Installation of a groundwater monitoring well network and initialization of a groundwater monitoring and reporting program
  • Compliance with waste discharge requirement (WDR) injection permit for the re-injection of treated groundwater to a beneficial use groundwater aquifer
  • Successful delineation vertical extent of tetrachloroethene (PCE)-impacted groundwater
  • Operation of a soil vapor extraction (SVE) system and compliance with regulatory air district discharge requirements
  • Technical reporting
  • Regulatory compliance

Stringfellow Superfund Site Remediation

Industry: Landfill / Superfund Site


EEC provides professional engineering services to Veolia Water as the current plant engineer for the operation, monitoring, and maintenance of remediation systems at the Stringfellow Acid Pits.  The Stringfellow site once operated as a hazardous waste disposal facility and more than 34 million gallons of industrial waste, primarily from metal finishing, electroplating, and pesticide production, were deposited in evaporation ponds that impacted beneficial-use groundwater beneath the site.


Project Highlights
  • Federal Superfund site
  • Groundwater impacted by perchlorate, volatile organic compounds (VOCs), cadmium, nickel, chromium, and manganese
  • Four long-term remedial phases: installation of a pretreatment plant, control of the source of contamination, remediation of the lower canyon, and remediation of the community wells and source control
  • 73 groundwater extraction wells and 350 groundwater monitoring wells
  • Groundwater treatment system
  • Lime precipitation treatment for the removal of heavy metals
  • Granular activated carbon treatment for the removal of VOCs
  • Ion exchange (perchlorate-specific, anionic resin) treatment for the removal of perchlorate

Dual-Phase Remediation of Petroleum Hydrocarbons

Industry: Industrial Laundry


EEC implemented a large-scale dual-phase extraction (DPE) remediation system to address petroleum hydrocarbon-impacted soil and groundwater.  EEC’s construction division performed turnkey installation of extraction wells, transit piping, and a system compound.  EEC is currently performing weekly operations and maintenance and is on pace for projected site closure.

Project Highlights
  • Turnkey system installation 
  • Multiple party coordination
  • VOC Remediation

  • Chlorinated Solvents

  • Groundwater Treatment

  • Superfund Remediation

  • Petroleum Hydrocarbons

Featured Projects - Shadow Padding

Latest News

In-Situ remediation refers to the cleanup of contamination in-place without the costly removal/ex-situ treatment of the soil and/or groundwater. In-situ remediation is often a logical choice for remediating a site due to the inherent cost savings; however, in some cases in-situ remediation is ineff...
Read More

Office Locations

EECWorld Los Angeles OfficeLos Angeles Area Office
1 City Boulevard West Suite 1800
Orange, CA 92868
Phone: (714) 667-2300
Fax: (714) 667-2310
EECWorld Mid-Atlantic OfficeMid-Alantic Office
200 Harry S Truman Parkway, Suite 330
Annapolis, MD 21401
Phone: (410) 263-2234