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Annual Site Environmental Report for 1999
Table 9.1 Summary of Maximum Groundwater Results from the RGA at C-404.
Upgradient Wells
Downgradient Wells
Parameter MW 226 MW 227 MW 93 MW 95 MW84 MW86 MW87 MW89 MW90 MW92
Arsenic* NO NO NO NO NO NO ND NO NO NO
(mgIL)
Cadmium* NO NO NO ND NO NO ND NO NO NO
(mgIL)
Chromium* 0.125 NO NO ND NO NO NO NO NO NO
(mg/L)
Chromium, NO NA NA NA NA NA NA NA NA NA
Dlssolved*
(mgIL)
Lead* NO ND ND NO NO NO NO NO NO NO
(mgIL)
Mercury * NO NO NO ND ND ND ND NO NO NO
(mgIL)
Selenium* NO NO NO NO NO NO NO NO NO ND
(mgIL)
TCE 42 8 7 8 9 2 ND NO 2 NO
(ug/L)
NO = not detected
NA = not analyzed
*Oissolved portion of metals concentrations analyzed only upon detection in the total portion.
monitoring system and the pennit when eight
quarters of sampling have been completed.
. r-;"
maximum results for each of the wells is
provided in Table 9.2 .
The MWs are sampled quarterly and in
accordance with Kentucky Administrative
Regulations (401 KAR 48:300). The analytes
are dictated by a KDWM approved solid waste
landfill permit modification. Evaluation of the
groundwater monitoring data collected at the C-
746-S and C-746-T landfills requires immediate
reporting to KDWM of results exceeding
Kentucky maximum contaminant levels (401
KAR 47:030 Section 6) and statistical analysis of
the results for constituents that do not have a
maximum contaminant level.
During. 1999; ':fCE ·exceeded i contaminant
levels in ithree downgradient wells;. chromium
exceeded contaminant levels in two upgradient
wells and six downgradient wells; and beta
actiVity exceeded. contaminant levels in one
upgradient well and three downgradient wells.
KE>WM was notified of the exceedences, as
required by the permit. Results were reported to
KDWM on a quarterly basis; A summary of the
A new solid waste landfill at the Paducah
Site, identified as the C-746-U Contained
Landfill, was completed in 1996 and operation
was initiated in 1997. Solid waste regulations
require groundwater characterization of the
uppermost aquifer down. to and including the
clusters (Figure 9.8). Each cluster is made up of
one well in the URGA and one well in the LRGA.
One well cluster (MW 276, MW 277) is located
upgradient of the facility and four wells
downgradient.
Evaluation of the groundwater monitoring
data collected at the C-746-U landfill included,
for pennitted wells, immediate reporting to
KDWM of results exceeding Kentucky maximum
contaminant levels (401 KAR 47:030 Section 6)
and statistical analysis of' the results for
constituents that do not have a maximum
contaminant level. During 1999, TCE exceeded
contaminant levels in two upgradient wells;
chromium exceeded contaminant levels in two
Groundwater
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