Allen Steam Facility (3)

January 5, 2010
Memorandum
To
From: Eric F ieek
Subject: Balanced and Indigenous Populations Review—Benthos Communities. Lake Wylie Near Allen Steam
Station (NPDES Permit No. NC0004979)
I have reviewed the subject document and offer the following comments and changes for future documents:
1) For future reports, (in addition to T ables 4-2, 4-3, 4-4) include a taxonomic table comparing taxa occurrences for
the current sampling year for EACH station so that a direct side-by-side comparison for each taxon by each station
for the sample year can be more easily conducted. Please see Table 1 below as an example.
Table 1.
Waterbody
LICKLOG BR
Date
8/9/2007
Location
SR 1706
County
Jackson
Taxon
EPHEMEROPTERA
ACENTRELLA SPP
PLAUDITUS DUBIUS GP
C
BAETIS FLAVISTRIGA
BAETIS INTERCALARIS
BAETIS PLUTO
PSEUDOCLOEON PROPINQUUM
SUGARLOAF CR SCOTT CR
8/9/2007 8/9/2007
OFF SR 1708 OFF SR 1556
Jackson Jackson
R
A
R
A
C
R
2) For future reports, (in addition to Figures 4-1, 4-2, 4-3, 4-4, and 4-5) include the following graphs for each
station and year (in the same format as currently presented) for the following groups. Non-Chironomid Diptera,
Ephemeroptera, Plecoptera, Trichoptera, Coleoptera, Odonata, Megaloptera, Crustacea, and Mollusca. Again, this
will allow for a more direct side-by-side comparison for each station and each taxonomic group. In addition, EPT
taxa richness and EPT density should also be reported for each station going forward. These metrics can be reported
in accordance with current graphical formats.
3) As can be seen in Figure 1, there appears to be a very large discrepancy in the mean and total abundance of the
burrowing mayfly Hexagenia spp. between Station A (Upstream of Allen Steam Station), Station B (at Allen Steam
Station), and Station C (Below Allen Steam Station). Indeed, Hexagenia spp. were collected at every sampling
effort from 2000-2008 at Station A (Upstream) but only collected twice (2000 and 2006) at Station B, and on four
occasions (2001, 2004, 2005, and 2007) at Station C. Hexagenia spp. have been reliably demonstrated to be
sensitive to low dissolved oxygen (Britt 1955, Beeton 1961, Beeton 1969, Verduin 1964, Carr and Hiltunen 1965,
Krieger et al. 1996, Edsall et al. 1999, Edsall 2001, Edsall and Phillips, 2006) as well as being sensitive to metals
and petroleum products (Edsall et al. 1991, and Schloesser et al. 1991) and have long been recognized as pollution
intolerant organisms and reliable indicators of overall healthy aquatic conditions (Bertram and Statler-Salt 1998,
Edsall 2001). Therefore, the discrepancy in the densities of these organism between stations is concerning and
requires additional explanation since it appears that these discrepancies are not the result of seasonal, depth, or
substrate differences between sites

CO
a
v
N
N
Figure 1. Annual, Mean, and Total Hexagenia spp. Density by Station: Lake Wylie, Near Allen
Steam Station.
2000 2001 2002 2003 2004 2005 2006 2007 2008 MEA N TOTAL
DENSITY DENSr1Y
p Station A (Uptake of Allen Stream Station) ■ Station B (At Allen Steam Station) ❑ Station C (Downlake of Allen Steam Station)
References Cited
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