EAS™ Related FAQs

EAS™ Frequently Asked Questions

These frequently asked questions (FAQs) are a compilation of EAS™-oriented questions and answers that we have received over time. We hope you find this information useful. If you have further questions, please contact us.

  1. What does EAS™ stand for?
  2. Will EAS™ work on gross free product?
  3. Are their any limitiations with the EAS™ Technology?
  4. What parameters should I test prior to injection? During? Post?

  5. Does EAS™ work in the smear zone/vadose zone?

  6. My smear zone or seasonal fluctuation is greater than 10 feet.  ShouldI inject in when the groundwater is high or low?

  7. Does EAS™ work in unsaturated soil?

  8. Is there a minimum concentration that EAS™ will work at?

  9. Will EAS™ work in clay? Bedrock? Silt? Sand?

  10. What if my site has a very high/low groundwater velocity? 

  11. How fast does EAS™ work?

  12. Do I need chase water? Should I dilute the EAS™?

  13. What is a typical radius of influence?

  14. Is there a retardation factor with EAS™?

  15. How is the amount of EAS™ calculated?

  16. How many times will I need to inject EAS™?

  17. How can I tell if EAS™ is working?

  18. Is there a minimum or maximum groundwater temperature that EAS™ needs to be injected at?

  19. Is there an optimum temperature?

  20. What bacteria reduce sulfate?

  21. Do I need to test for sulfate reducing bacteria population? Will I ever need to bioaugment?

  22. My smear zone is unusually black?  Why is this?

  23. How is the quantity determined?

  24. At what levels does sulfate occur naturally?

  25. What if the sulfate levels in my plume are low? High?

  26. Do I need chase water? Should I dilute the EAS™? How much?

  27. Does my dilution water/chase water need to be anaerobic?

  28. If I use city water, do I need to worry about other constituents such as nitrate, fluoride or chloride?

  29. What is the target level of sulfate to inject per liter?

  30. On what contaminants will EAS™ work?

  31. What if my site has a very high/low groundwater velocity?

  32. Will injecting one pore volume dilute the plume?

  33. What should be my sulfate concentration after 1, 3, 6, 9, 12 months

  34. Do I need to reinject? How will I know when it is time to reinject?

  35. How will I know EAS™ is working?

  36. Are their any limitation to EAS™?

  37. What parameters should I test prior to injection? During? Post?

  38. Is there a retardation factor with EAS™?

  39. How is quantity of EAS™ calculated? Is it based on 500mg/L or 4.7 mg sulfate per mg of benzene (contaminant).

  40. What are the chances EAS™ will work with only one application?

  41. My states MCL for sulfate is 250 ug/l; when EAS™ is injected, that level is surpassed.  Do I need any special permits or paperwork for this? Would it be possible to more EAS™ injections at a lower level as to not exceed the MCL of 250 mg/L?

What does EAS™ stand for?
EAS™ stands for Electron Acceptor Solution.

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Will EAS™ work on gross free product?
EAS™ is not suggested at sites where gross free product is available. EAS™ can be used at sites with residual impact ("sheen" or high dissolved concentrations) and it can be used to polish off sites where gross free product has been removed. Residual soil impact in vadose zone may need to be addressed by other techniques.

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Are their any limitiations with the EAS™ Technology?

  • The groundwater must be deeper than 5 feet below ground surface
  • The distance to residence, surface water or private well must be greater than 100 ft
  • Distance to municipal DW well (100s of gpm) > 1250 ft
  • The plume should be stable or decreasing

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What parameters should I test prior to injection? During? Post?
Please see our EAS™ Injection Protocol for Monitoring Protocol aviable for download in our Library.