Case study: Monroe, Connecticut, USA

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Courtesy of Ivey International Inc.

Monroe Facts:

  • former heating oil terminal from the mid-1950's to the late 1970s
  • No. 2 fuel oil was stored at the site
  • Multiple releases occurred over time
  • Site and surrounding area are wetlands, with the former terminal area elevated with fill material for commercial use
  • Irregular fill consisting of sand, silt, gravel and boulders with some timbers and metal buried throughout the site
  • Sensitive receptors are adjacent stream and down-gradient potable wells
  • High vacuum (dual phase) extraction system in use at the site since late 1999
  • Selective Phase Transfer Technology
  • Monthly SPTT injections commenced In May 2002

Conclusions:

  • Mass Recovery = Flow Rale x Concentration
  • Mass Recovery (pounds per day) = gallons per minute (gpm) x mg/l X 0.012
  • 3.785 l/gal x 1 lb/454,000 mg x 1440 minutes/day - 0.012
  • Mass Recovery prior to the infection period is based on an average influent concentration of 0.75 mg/l
  • 8 gpm x .075 mg/l x 0.012 - 0.072 lbs/day - 3.269 x 104 mg/day (prior to SPIT use)
  • Mass Recovery during the Injection period is based on a concentration average calculated using the post injection peak concentrations of 3.07 mg/l
  • 8 gpm x 3.07 mg/l x 0.012 = 0.29472 lbs/day = 13.38 x 104 mg/day (during SPTT use)
  • Pre vs. post injection mass removal rates show an increase of 409.3%

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