How do I measure the presence of EOS® in the aquifer?
There are both direct and indirect ways to measure the presence of EOS® in the aquifer. Apparent turbidity, observed as a faint white tint in performance monitoring wells, can sometimes be used as a visual indicator of EOS® presence. Laboratory analysis for total organic carbon (TOC) and volatile fatty acids (VFA) can also provide direct indications of the presence of substrate. Indirectly, changes in groundwater geochemisty as a result of formation of anaerobic reducing conditions suggest that EOS® is present.
Can EOS® be used to effectively immobilize heavy metals?
Yes metals immobilization is possible. Because EOS® creates reducing conditions in the aquifer, certain redox sensitive metals (i.e. Al, Cu, Pb, Mn, and Zn) can be precipitated into non-mobile forms of various metal sulfide species. If your site doesn’t have a sufficient sulfate concentration then the addition of EAS may be required. Please contact us for more information and to discuss the details of your site.
What does EAS stand for?
EAS derived from “Electron Acceptor Solution” and from “Effective Anaerobic Solution.”
Will EAS work on gross petroleum free product?
EAS is not recommended for sites where gross, petroleum-based free product is measurable (i.e., light non-aqueous phase liquid = LNAPL).
EAS can be used at sites with residual impact (“sheen” or high dissolved concentrations) and it can be used to polish off sites where free product has been removed. Residual soil impact in the vadose zone may need to be addressed by other techniques.
Are there any limitations 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 deepwater well (100s of gpm) > 1,250 ft.
