Enclosure (1) TO COMDTINST 16478.12
The results of methyl mercury analyses from all locations revealed no levels
in exceedance of 1.0 percent methyl mercury. No location indicated a cause
for concern.
Post Removal Results
The Volpe Center also conducted a demonstration cleanup project in the Tampa
Bay area. The purpose of this project was to address the immediate remedial
requirements in Tampa Bay and to develop a standard method for addressing
other removal actions. Confirmatory sediment sampling and clean-up
documentation was produced for each site.
Volpe Center staff and contractors began battery removals in the Tampa Bay
area immediately following a battery site sampling and removal prototype
effort on January 31, 1994. Battery removals took place at locations
identified during a previous aquatic survey conducted by Law Engineering,
Incorporated (Law Engineering, 1993). That survey identified 29 sites (of
their surveyed 47) that had visible batteries, and they predicted that about
eight hundred in total could be removed. The actual number exceeded 1300.
Sediment samples were collected during the demonstration project. Some AtoNs
surveyed during the Tampa Bay prototype were resampled during the
demonstration project; that is, after battery removal was conducted. Before
and after comparisons at those sites, as well as the sediment sample results
at other sites are included in this report.
As with all other locations, the important comparison criteria for AtoN
battery sediment sample results are the established background levels (based
on perimeter sampling) and the NOEL, ER-L, ER-M and ER-H levels. The former,
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