Groundwater and Soils Remediation City of Industry, California

Situation

Soil and groundwater at a closed electronics manufacturing facility within San Gabriel Basin Superfund Area were impacted by releases of more than a dozen chlorinated solvents. A groundwater plume has migrated more than 1/2 mile from the site, with indications of a continuing on-site DNAPL source. Hydro Geo Chem was retained to:

Develop soil cleanup standards appropriate for the site, and design and install a soil vapor extraction system suitable for low permeability sediments.

Evaluate the lateral and vertical extent of groundwater plume migration.

Design and construct on-site groundwater containment and source removal system and obtain closure.

Hydro Geo Chem's Approach

On- and off-site soil-gas sampling delineated the extent of VOC-impacted soils. These were followed by pilot SVE tests, numerical simulations of SVE performance, and development of risk-based soil cleanup levels based on infiltration and VOC diffusion to the water table. We then managed the engineering and construction of a full-scale SVE system, including a data acquisition system with automated monitoring of exhaust gases. We conducted on- and off-site groundwater investigations, pilot groundwater extraction testing, and a remedial feasibility study. Numerical modeling of groundwater cleanup permitted identification of system requirements and optimal extraction locations. The system includes vacuum-enhanced extraction wells in the source area for aggressive DNAPL removal.

Results

The closure criteria for soil cleanup levels were reached after 2 years of active SVE. We conducted confirmatory soil investigations, petitioned for closure, and received a No-Further-Action determination from the State of California. We demonstrated that natural attenuation was limiting off-site migration, thus reducing or eliminating the need for expensive off-site remediation. Our on-site groundwater corrective action plan was approved by the state, and we are currently implementing construction of extraction and treatment systems.

HYDRO GEO CHEM, INC.
51 West Wetmore Road, Suite 101, Tucson, Arizona 85705-1678

Toll Free (800) 727-5547, Tel. (520) 293-1500, Fax (520) 293-1550, Email contact@hgcinc.com

3038 East Cactus Road, Suite 3, Phoenix, Arizona 85032-7113
Tel.
(480) 421-1501, Fax (480) 425-8794
 
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