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Site Remediation
Figure 1. Concentrations of benzene in groundwater before and one-year after EHC-O injection.
EHC-O at 14.5-percent solution were injected at each point as the rods were retracted from the resulting borehole. Exact injection point locations and volume of injected solution varied depending on site conditions and soil matrix. EHC-O provides a source of nitrogen in the form of ammonia to ensure adequate nitrogen is present for the in-
digenous microorganisms to utilize the available carbon (i.e., hydrocarbons). The Result Approximately 4 months following EHC-O injection, the concentration of benzene in groundwater decreased by >99% in both monitoring wells. One year after treatment, monitoring showed that the concentration of benzene, and
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other constituents, remained below analytical detection limits (Figure 1). There was no rebound and the site was recommended for closure with no further investigation or remedial action necessary. For more information, E-mail: kerry.shaw@adventusgroup.com
MULLTIST MULTISTAGE T TA AGE CENTRIFUGALL sA Airflow irflow to 41,000 cfm s Pressure Pressure to 22 psig s VVacuum acuum to 18 "Hg
POSITIVE DISPLACEMENT POSITIVE DISPLACEMENT sA Airflow irflow to 18,000 cfm s Pressure Pressure to 20 psig s VVacuum acuum to 17 "Hgg
REGENERA REGENERATIVE ATTIVE sA Airflow irflow to 900 cfm s Pressure Pressure to 13 psig s VVacuum acuum to 14 "Hg
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