Graves' data raises serious questions about Lockheed's data and conclusions, said Tim Varney, a scientist with Chastain Skillman and Tallevast's technical consultant.Varney
described Lockheed's monitoring wells as state of the art, but he
said the sampling methods used were not adequate to define the plume.Some of Lockheed's monitoring wells were sampled too early after they were drilled, Varney
said.In some cases, the wells were not sampled deep enough to tell how far down the contaminants may have sank.
"This data raises serious questions on whether the plume has been fully characterized, both vertically and horizontally," said Varney
Either way, Varney
said, finding 1,4-Dioxane on Booth's property means the solvent has spread far from its source at the former beryllium plant.
said Graves' test data on Booth's well challenges Lockheed's cleanup plans, which currently call for removing solvents in the groundwater beneath industrial site primarily through a pump-and-treat method.
"It would be very hard to remediate a plume extending all of the way to 301 by a pump-and-treat method," said Varney
."You could not pump and treat from just one location to remediate a plume this size."Varney
said remediation of the plume would require a distribution of treatment areas throughout the Tallevast community.
"We know 21 of the wells have levels of contaminants that exceed groundwater clean-up standards under the Safe Drinking Water Act," said Varney
."Some of those compounds are carcinogenic and some cause systemic health problems."
Factoring those levels into computer programs to measure exposure risk over time would likely indicate significant excess risk, Varney
Until that model is constructed, any plans for remediation would be premature, Varney