for natural gradient conditions versus the hydraulic flow field created for the flushing test. The

samples considered in this Chapter are all under the influence of the remedial flow-field. All

initial flow field aqueous concentrations are scaled to the maximum PCE water concentration of

156 mg/L. The results are summarized in Table 2-3.

Table 2-3. Sages scaled PCE concentrations from the pre-flood flow field sampling.
 MILS sampling depths are meters below ground surface.
 Well Pre CpcE 8.08 m 8.69 m 9.07 m 9.45 m 9.91 m

 RW-2 0.411
 RW-3 0.296
 RW-4 0.109
 RW-5 0.007
 RW-6 0.151
 RW-7 0.110
 Mean MLS
 MLS-1 0.393 0.445 0.397 0.655 0.173 0.298
 MLS-2 0.423 0.700 0.533 0.667 0.173 0.040
 MLS-3 0.540 0.293 0.619 0.608 0.540 0.642
 MLS-4 0.316 0.012 0.371 0.313 0.464 0.419
 MLS-5 0.067 0.007 0.115 0.176 0.032 0.003
 MLS-6 0.465 0.108 0.422 0.600 0.158 1.038
 MLS-7 0.400 0.072 0.575 0.318 0.400 0.637


 Although RW-2 and the average concentration at MLS-2 observed a similar 0.4 fraction

of maximum PCE solubility, the mean MLS scaled concentrations were higher than their

respective RWs. This was similar to the PCE saturation results in Table 2-2. Statistically, there

was not a strong correlation between SN values and aqueous PCE concentrations. However,

qualitative analysis shows similar distributions of free phase and dissolved PCE. MLS-1, MLS-

2, and MLS-3 recorded the highest concentrations in the upper sampling zone. The mid-depth

region was dominated by higher PCE concentrations in MLS-1, MLS-2, MLS-3, MLS-6 and

MLS-7. The lowest sampling zones showed higher values at MLS-3, MLS-4, MLS-6 and MLS-

7. At the lowest depth of MLS-6, where the highest PCE saturations were recorded, the aqueous

PCE concentration was also highest.