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SITE-WIDE GROUNDWATER PROGRESS REPORT FOR THE FORMER HOFFMANN-LA ROCHE INC. FACILITY, NUTLEY, NEW JERSEY
Hoffmann-La Roche Nutley Remediation Project Website, 50 pp, 2017

The total of 59 confirmed groundwater contaminants for this site includes chlorinated VOCs, SVOCs, 1,4-dioxane, pesticides, and metals. In-well air stripping (IWAS) and ozone injection activities were initiated in the IA-1/4 interim remedial measure (IRM) in August 2015 and continue to the present. IA-2 in situ thermal treatment operations were completed in early 2016. The VOC plume south of the IA-2 Tank Farm, which had migrated into the northern portion of IA-6, was successfully remediated with an IWAS system (99.9% VOC reduction), and those wells were idled in December 2016. Also in December 2016, an area of VOC-contaminated groundwater beneath the thermal treatment zone was further addressed by installation and operation of two IWAS wells; operation is ongoing. IWAS and enhanced in situ bioremediation (EISB) amendment injection equipment was installed in the IA-3/7 IRM area between December 2016 and March 2017. Operation of the treatment systems and initial EISB amendment injections began in April 2017, with a second round in July 2017. The IA-6 IWAS/in situ chemical oxidation (ISCO) IRM system began operation in April 2016 and continues to the present. Successful removal of chlorobenzene in the target treatment zone was achieved in January 2017, and IWAS remediation of residual chlorobenzene and CVOC concentrations continued through July 2017. In 2015, two IRMs consisting of one-time bioamendment injections into shallow groundwater were completed in IA-10. Roche completed the excavation of PCE-contaminated weathered bedrock from beneath the abandoned Clifton-Allwood municipal sewer (CAMS) manhole in IA-11 to a depth of 26 ft bgs between January and March 2017 and backfilled the excavation with gravel containing a bioamendment to encourage reductive dechlorination of residual CVOCs in local groundwater. Groundwater monitoring demonstrated that the source zone has been remediated successfully. The IA-12 IWAS/ISCO system targeting the CVOC plume where breaches in the CAMS were found began operation in late June 2016 and is ongoing. http://www.roche-nutley.com/home/RemediationUpdates/GWUpdateNov2017.html



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