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During installation of a deep sewer approx.
two (2) miles long, extensive pumping of the groundwater was required to de-water the
trench. The groundwater, contaminated with approximately 100 ppb of chlorinated
hydrocarbons (TCA, TCE, DCE, DCA, VC, etc.) required treatment prior to discharge to a
nearby stream which emptied into a protected river. Required discharge levels of VOC were
less than 0.2 ppb. The treatment system was designed
to treat 4,000 gpm of groundwater through a Marley air stripper and eight (8) Calgon
carbon towers. CO2 was added to prevent scaling of the carbon beds. Automated controls
were designed to alert operators through a cellular telephone. No detectable levels of
volatile organic compounds were detected in the effluent. Hayden Associates functioned as
the design engineer to a sub-contractor for this project. |