Cost and Performance Information

Cost and performance reports were prepared for natural attenuation of petroleum hydrocarbons and chlorinated solvents. These reports are summarized in PowerPoint presentations for both petroleum hydrocarbons and chlorinated solvents. The salient points discussed in both documents include the following:

• Monitored natural attenuation (MNA) of chlorinated aliphatic hydrocarbons was recommended as the primary treatment alternative for at least a portion of the CAH plume at every site evaluated in the AFCEE Technology Transfer field investigations. However, it was recommended as the sole remedial alternative at only 2 of the 14 sites studied.
  
  
• Natural attenuation of petroleum hydrocarbons was occurring to some extent at each of the 42 sites studied by AFCEE Technology Transfer.
  
  
• Engineered alternatives, such as source reduction, should be evaluated to determine their impact on CAH plume migration and acceleration of clean-up.
  
  
• The average present value cost to implement MNA as the sole alternative at CAH contaminated sites was $480,000 per site. When an engineered alternative at the source area was added the present value cost increased to $876,000.
  
  
• The average cost of LTM for MNA remediation was $192,000 over the 30 year period estimated for clean-up. The addition of engineered source treatment increased the average cost to $816,000 while reducing the time to clean-up to 15 years.