Identification of High-Risk Dry Cleaning Sites in San Diego County: Data Collection and Remediation

Christy Dykstra


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The goal of this project was to locate and collect site data for all present and historical dry cleaners in San Diego County. Additional data pertained to dry cleaning sites’ responsible parties and operation status. This report pertains to the first phase of this project, which was conducted by students in Environmental Engineering 558: Solid and Hazardous Waste Engineering. The collected data were developed into a comprehensive database to be used for prioritizing perchloroethylene and trichloroethylene testing. These sites include areas where likelihood of contamination is high and areas that may impact vulnerable populations. Remediation methods are also provided in this report for soil and groundwater cleanup. After the first round of validation, 594 dry cleaning sites were identified, most of which were active and located in the northern part of the county. A summary of perchloroethylene and trichloroethylene remediation methods is provided, including the following techniques: air stripping (ex-situ and in-well), air sparging, soil vapor extraction, thermal extraction, pump and treat, in-situ chemical oxidation, in-situ chemical reduction, aerobic degradation, anaerobic degradation, absorption, soil excavation, and treatment.

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