Estimated NAPL removal (ENR) was determined from the amount removed in the flood,
the post-remedial saturations, and the mean arrival time of the post-flood conservative tracer.
First, each MLS the ethanol flood BTC was numerically integrated using the trapezoidal method,
resulting in [(mg/L)*T] units. The density of PCE (pPCE) is 1.62 g/cm3
CPCEdT
ENR= .Pc .-) (2-4)
(S"' *7*PPCE P+CpdT
The ENR moderately correlated with FNR determined directly from the PITT (R2=0.64). The
ENR calculations were then employed to back-calculate initial PCE saturation using Eq. 2-3.
These results are included in Table 2-2 and indicated with asterisks.
2.13 Flux Reduction
In the remedial induced flow field, groundwater concentration data was scaled to the PCE
maximum solubility. By comparing the initial scaled concentrations to the post-remedial scaled
concentrations, we can calculate a fractional flux reduction (FFR) using the left side of Eq. 1-15.
Table 2-9 summarizes the RW and MLS flux reductions as a result of this pilot test.
Table 2-9. Fractional flux reduction (FFR) based on scaled PCE concentrations from RW
and MLS wells. MLS sampling depths are meters below ground surface.
Well FFR 8.08 m 8.69 m 9.07 m 9.45 m 9.91 m
RW-2 0.785
RW-3 0.736
RW-4 0.605
RW-5 -0.311
RW-6 0.462
RW-7 -0.273
Mean MLS
MLS-1 0.682 0.994 0.999 0.411 0.936 0.068
MLS-2 0.948 0.906 0.988 0.996 0.970 0.881
MLS-3 0.823 0.967 0.998 0.977 0.194 0.981
MLS-4 0.989 1.000 0.987 0.989 0.993 0.975
MLS-5 -19.285 1.000 -1.092 -0.333 -14.037 -81.964
MLS-6 0.980 1.000 0.989 0.994 0.954 0.963
MLS-7 0.492 0.862 -0.425 0.968 0.796 0.258