Enclosure (1) TO COMDTINST 16478.12
detector (PID) meter and (2) a mercury
vapor analyzer (MVA), both capable of
detecting concentrations as low as the
OSHA PEl level (.05 mg/m(3)). No
measurable mercury concentrations were
found in air samples measured at
Anclotte Key Light and Egmont Light in
Tampa Bay.
Analysis of Sediments
The results of sediment analysis are summarized in Table S-2. The average of
the mean sample values grouped by proximity to the AtoN are reported for each
location investigated during the prototype studies. The near field average is
for samples taken within 10 meters of the base of the AtoN. Samples taken at
distances greater than 10 meters are reported in the far field rows, and
samples taken directly at batteries are reported separately. Reference values
were measured at unlighted AtoNs near the sample locations. These AtoNs,
which do not require batteries, were chosen due to their similarities to the
prototype locations chosen for study. Additional comparative background
levels are include the table; these have been established by state agencies or
other research. The states of Florida and Washington each have sediment
"criteria" levels relevant to these studies.
NOAA publishes a set of screening "guideline" which may also be used for
comparison.
Analysis of Biota
In Chesapeake Bay, seven biological samples were collected from batteries and
five were taken from structure near the AtoNs. The average mercury
concentrations in the samples from batteries was 0.02 mg/kg (wet weight). No
values above 0.05 mg/kg (wet weight) were reported. All of these values are
well below the FDA action limit of 1 mg/kg (wet weight).
In Tampa Bay the biological samples showed a pattern similar to that seen in
Chesapeake Bay. The average concentration was 0.03 mg/kg (wet weight) with a
maximum value of 0.09 mg/kg (wet weight). These samples were taken near the
Alafia River. In these cases, sample on pilings were less than the levels
taken on batteries. These levels were six
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