1 - paducah environmental information center

Paducah Site.
(also known as an acute test) were conducted for
Outfalls 015, 017, and 019, and longer term 6- or
7-day toxicity tests (also known as a chronic test)
were conducted for Outfall, 001. For the acute
toxicity test data, the 48-hour LC so (concentration
that is lethal to 50% of ,the· test organisms) was
determined and Ithe acute toxicity unit (TU a) was
calculated l (TU a
= lOOILC so )' For the chronic
toxicity tesrdata, the 25% inhibition concentration
(IC25, that concentration causing a 25%
reduction in fathead minnow growth
Ceriodaphnia reproduction compared to a
control) was determined and the chronic toxicity
unit (TV c ) was calculated (TVc = 100IlC25). The
TV a and TV c are compliance endpoints in the
KPDES permit. For permitting purposes,
KDOW has determined that Little Bayou and
Bayou creeks have a low-flow zero; thus a TV >
1.0 would be considered a noncompliance and
an indicator of potential instream toxicity. A TV
~ 1.2 is considered a significant noncompliance.
During 1999, five toxicity exceedences
were noted at KPDES Outfall 017. Details are
provided in Sections 2 and 7· of this ASER.
Terrestrial Wildlife
Annual Deer Harvest
found elevated in the muscle of background
(Tables 8.4 and 8.5).
In summary, there were no unusual
findings in the 1999 deer data. When comparing
Paducah Site deer data to the reference· deer data,
the results were not substantially different. The
data from future sampling events will continue to
be assessed to identify any potential trends.
Additional data is provided in Appendix C.
Non-Routine Rabbit Sampling
At the request of KDFWR, rabbit sampling
was conducted in 1999. Muscle and fat tissue
from seven rabbits collected at WKWMA were
sampled for radionuclides (Section 5), PCBs,
. and inorganic elements. No PCBs were detected
in any samples. Copper, aluminium, iron,
manganese, and zinc were detected in several
muscle samples and barium was detected in one
muscle sample. No regulatory standards exist by
which to compare these results.
Additional data is provided in Appendix C.
The deer population in WKWMA is
sampled annually to determine levels. of
radionuclides (Section· 5), PCBs, and inorganic
elements that might be attributed to past plant
practices.. There were eight deer harvested from
WiKWMA and two deer harvested from the
BWMA to. serve as reference samples. There
were no PCBs detected in the fat tissue, muscle,
or liver samples of any of the ten deer harvested.
Of the inorganics detected, all results for the
WKWMA deer were comparable to the
reference deer except for the presence of small
amounts of barium, nickel; and copper in the
liver of some WKWMA deer. Silver was found to
be elevated in the muscle of a WKWMA deer and
nickel was found elevated in another WKWMA
deer. Beryllium, iron, vanadium, and zinc Were
8-8
Nonradiological Environmental Surveillance