San Diego - Hydrolysis remediation of TCA/TCE in soil and groundwater - Case Study


Courtesy of TRS Group, Inc.

Hydrolysis remediation using ERH

Project Summary

TRS Group, Inc. designed and implemented an electrical resistance heating (ERH) system to reduce concentrations of chlorinated volatile organic compounds (CVOCs) in soil and groundwater at a site in San Diego, California, Chlorinated solvents including 1,1,1-trichloroethane (TCA) and trichloroethene (TCE) had impacted the soil and groundwater beneath the site. The clean-up objective for the remediation was to reduce CVOC concentrations in soil and groundwater in the ERH remediation area by 90 percent from existing concentrations. A combination of sheet pile and bored electrodes were implemented at a depth of 30 feet below ground surface (ft bgs) over an area of approximately 36,740 square feet (ft2) resulting in a remediation volume of 34,018 cubic yards (yd3). The ERH remediation was highly successful, with a total of 47,105 pounds of contaminant mass being physically removed from within the remediation area or remediated in-situ through hydrolysis, reducing CVOC contaminant concentrations in soil by greater than 99 percent, with final concentrations of less than 10 mg/kg at each of the 20 confirmation soil boring locations and at each depth sampled.


The site is located in a light industrial area and is bordered to the northwest and southeast by commercial properties. A
railroad right-of-way and a wetlands area borders the southwestern portion of the site. The property is approximately 3,7 acres in area with an approximately 31,000 square foot concrete tilt up building situated on it. The site was developed in 1963 and was used for the manufacturing of ceramic capacitors from the late 1960's until 1986 when the property was vacated. In 1990, the property was leased to a printing company and was sold in 2004 to a development group. The property was re-sold in 2007 and in 2013, The property is currently in use as office space and the parking lot is used for vehicle storage. The site is currently occupied by one building, with the remainder of the property covered as an asphalt and concrete parking lot, driveways, and planter areas as depicted in site aerial photo, Figure 1. A chain link fence surrounds the entire property, with the exception of a portion of the southeast parking lot.

In order to complete the installation and operation of the ERH remediation system, multiple permits were required by and obtained from multiple agencies.

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