California Central Valley Regional Water Quality Control Board, 105 pp, 2017

Site investigations at this former sawmill detected diesel, pentachlorophenol (PCP), and tetrachlorophenol (TCP) in the soil and groundwater. A pilot test of in situ chemical oxidation (ISCO) for the PCP and TCP began in May 2016 under site-specific Order No. R5-2015-0012-016. Pilot-scale ISCO remediation activities were conducted in May, June, and September 2016, and groundwater monitoring was conducted through December 2016 in compliance with the site-specific monitoring and reporting program. During each of the three injection events, ~440 lb of persulfate mixed with ~400 gal of water was applied to three injection wells. The contractor requested termination of coverage for the project in this fourth quarter and annual 2016 monitoring report, which includes the pilot test monitoring data, concluding that persulfate was not effective at the site, even though previous bench-scale testing indicated reduced contaminant concentrations. Monitoring did not indicate any detrimental effects from the injections in the compliance wells. Further pilot testing of persulfate is not warranted. http://geotracker.waterboards.ca.gov/esi/uploads/geo_report/4158700764/SL185212901.PDF
See more information on the progress of this cleanup at http://geotracker.waterboards.ca.gov/profile_report?global_id=SL185212901.