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STATUS REPORT ON REMEDY EFFECTIVENESS: HOOKSTON STATION, PLEASANT HILL, CALIFORNIA
California Regional Water Quality Control Board, San Francisco Bay Region. 142 pp, 2017

As detailed in this report, the Hookston Station parties have implemented several remedial actions to address environmental impacts associated with the presence of TCE and daughter products. Between 2008 and 2010, five in situ chemical oxidation injection events were implemented to remediate B-Zone groundwater. Performance monitoring showed successful distribution of potassium permanganate throughout the targeted treatment area. VOC concentrations in B-Zone wells within the core of the on-site source area are lower than pre-remediation results by up to two orders of magnitude. No additional ISCO injection events are needed. Since the installation in 2009 of a permeable reactive barrier (PRB) containing zero-valent iron to remediate A-Zone groundwater, TCE concentrations in groundwater have decreased significantly. Owing to the PRB's efficacy, only a handful of wells remain above the cleanup standards, and CVOC concentration trends in soil vapor are decreasing. http://geotracker.waterboards.ca.gov/esi/uploads/geo_report/7826408088/SL601392782.PDF



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