RCRA/VRP REMEDIATION SITE
Opelika, AL
Contaminants:
Chlorinated
VOCs
(1,1-DCE,
1,1-DCA, TCE)
Treatment:
ISCO Injections
Site Status:
Active, closure pending in 2013
Envirorisk performed a full scale ISCO treatment on an industrial site historically utilized as a German POW camp during World War II. Treatment was performed inside a 950,000 square foot facility previously occupied by a fitness equipment manufacturer who discharged chlorinated solvents (1,1,1,-TCA, TCE, etc.) through storm drains and/or discarded drums. Rapid plume delineation was performed using a DPT rig with a mobile lab and a MIP to expedite characterization. A large VOC plume (approx. 150,000 ft2 or 3.5 acres) was discovered beneath the warehouse floor. Primary VOCs detected included 1,1-DCE, 1,1-DCA, TCE, BTEX and other non-chlorinated VOCs. In the source area, >50,000 ppb of total VOCs was observed but no DNAPL was detected (see graph). The aquifer consists of silty-sand/sandy-silt saprolite derived from granitic gneiss/mylonite. Depth to water is approximately 10 to 20 feet below ground surface (bgs).
After evaluating a variety of remedial options, ISCO was chosen as the most cost effective and rapid means of treatment. A treatability study was initially performed which identified alkaline (high pH) activated sodium persulfate as the most effective oxidant. In spring 2008, approximately 196,000 pounds of Klozur® was injected into a total of 911 PVC injection wells
Confirmatory groundwater sampling analysis indicated a 70% reduction in the VOC plume size and concentration magnitude. Four additional smaller area injections were performed from 2009-2011 along with a recent “spot” treatment in May 2012. Data collected in September 2012 indicates VOC concentrations have been reduced to non-detect and/or below risk levels. Groundwater monitoring expected to continue to early 2013, when a NFA is expected.
RCRA/VRP REMEDIATION SITE
Opelika, AL - Page 2