CASE STUDY: ACTIVATED SODIUM PERSULFATE ISCO TREATMENT OF A BENZENE PLUME, LA MIRADA , CA JAG Consulting Group completed a successful ISCO treatment on a benzene plume using activated sodium persulfate. Two activation techniques were used for the sodium persulfate; use of catalyzed hydrogen peroxide and ferrous iron activation. The ISCO treatment was performed under a General WDR permit issued by the Los Angeles RWQCB. SITE BACKGROUND Benzene leaking from an underground storage tank caused extensive groundwater contamination at an industrial site in La Mirada, CA. Pump and treat was performed for over 10 years and was successful in controlling the off-site migration of contamination and in reducing the Benzene levels from over 90,000 µg/l to 5,000 µg/l over

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