QED Environmental Systems, Inc

AutoTracker Reduces Remediation Cost per Gallon by 59% - Case Study

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Courtesy of QED Environmental Systems, Inc

AutoTracker™ (U.S. Patent Number 6,520,259) Floating Extraction Inlets were added to a DPE system at a remediation site in mid-Michigan following several years of operational problems caused by fluctuating water table levels. Installation was straightforward and system performance improved immediately, reducing on-site maintenance, labor and O&M costs and greatly improving groundwater recovery. Ongoing savings were so dramatic that payback for the initial capital cost was achieved in just 4 months! Projected over the project life cycle, cost savings should surpass $600,000, with an expected 10-year reduction in time to reach the remediation target.

Site Background Data:

  • 12 well dual-phase extraction system
  • 2-acre encapsulation and treatment cell
  • Well depths: 20-40 feet bgs; static water level: 15-20 feet bgs
  • Approx. 30,000 cubic yards of soils contaminated with chlorinated solvents
  • 25 HP rotary lobe blower used
  • Each well extracts 20-30 scfm of vapor at 10-13' Hg
  • Recovered vapor & groundwater treated with vapor/liquid phase activated carbon

History Prior to AutoTracker Installation:

  • System operated 1999-2001 with fixed entrainment tubes
  • Water level changes caused by seasonal fluctuations and/or blower shutdown resulted in dry recovery, deadhead and liquid choking conditions
  • O&M costs increased by need for frequent manual adjustment and maintenance
  • Air/groundwater recovery rates decreased due to extensive system downtime

AutoTracker Performance:

  • Floating Extraction Inlets installed summer 2002
  • O&M costs reduced 20% due primarily to reduced labor
  • Payback period less than 4 months
  • Groundwater recovery rates nearly doubled
  • Groundwater recovery cost per gallon reduced 59%
  • Estimated project duration cut from 30 to 20 years
  • Estimated life cycle cost savings: over $600,000

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