HRC? REMEDIATION OF PCE AT A NEW JERSEY, PRINTED CIRCUITS SITE

摘要

Spilled perchloroethene (PCE), at a former printed circuits manufacturing facility in New Jersey had migrated through the saturated overburden and into fractured bedrock. Upward vertical flow within the aquifer mitigated the depth of migration, and PCE was delimited to the saturated overburden and shallow bedrock. Ground water monitoring over the ensuing 15-year period consistently measured PCE concentrations up to 80,000 μg/L, and PCE represented more than 80 percent of the total VOC mass. Hydrogen Release Compound (HRC?) was injected during September/October 2001 and approximately 16,000 pounds of HRC? were injected into 200 well points using a combination of direct-push and air rotary equipment with inflatable packers. Monitoring in the first year after injection demonstrated dramatic improvements in the core of the treatment area. Post-injection PCE concentrations declined to less than 10 percent of the total VOC mass and 1,2-DCE increased to approximately 85 percent of the VOC mass with significant increases in vinyl chloride concentrations. PCE concentrations at the fringe of the treatment area exhibit PCE reductions of more than 50 percent. Targeted reinjection of HRC? and attenuation monitoring are planned and overall, HRC? has significantly influenced geochemical conditions to promote in situ dechlorination. The net outcome has been dramatically improved ground water quality and a high probability that the site will be suitable for no further remedial action within a 3 to 5 year timeframe.