NC0039586_AGPT Study Plan for Harris Lake_19910307

DIVISION OF ENVIRONMENTAL MANAGEMENT
March 7, 1991
MEMORANDUM
TO: Jay Sauber
FROM: Betsy Johnson 3)
THROUGH: Mike Scoville MDS
Ruth Swanek rRC5
SUBJECT: AGPT Study Plan for Harris Lake
Harris Lake receives discharges from Shearon Harris Power Plant (17
MGD; .0.5•MGD is domestic) Shearon Harris Environmental Center (.014 MGD),
and Country Lakes Estates (.09 MGD). While the total domestic discharge
to the lake is low, .154 MGD, the lake receives no summer 7Q10 inflow.
The retention time of the lake is estimated to be 1412 days. Other
sources of nutrients are zinc phosphate in the boiler blowdown and
nonpoint sources. There are currently no nutrient limitations on the
above discharges.
The 1989 Environmental Monitoring Report prepared by Shearon Harris
indicates that 1989 was a peak year (data since 1985) for chlorophyll -a
and nutrient levels. Chlorophyll a levels exceeded the state standard of
40 ug/l at all sampling sites in May 1989. TN and TP levels were also at
their highest. TN and TP levels exceeded the 0.1 and 0.01 mg/l levels
recommended to avoid eutrophication. The 1990 report is not yet
available.
It is recommended that AGPT and nutrient data be collected at the
four stations sampled by CP&L (E2, H2, P2, S2). An additional sammple
should be taken below the Environmental Center on Little White Oak Creek;
perhaps at SR 1128. These sites are marked on the attached topo map. At
these stations, field parameters, nutrient concentrations (i.e., TP,
Ortho -P, TN, TKN, NH3-N, and NO2+NO3), and chlorophyll a should be
collected.
Samplincr Sites
1. HARO1 (E2): Harris Lake below Shearon Harris Power Plant discharge
^, If you have any questions regarding the study plan, please call me.
point
2.
HAR02
(H2):
Buckhorn Creek arm of .Harris Lake; downstream of Country
Lakes Estates
3.
HAR03
(P2):
central Harris Lake
4.
HAR04
(S2):
White Oak Creek arm of Harris lake
5.
HAR05:
Little White Oak Creek arm of Harris Lake at SR 1128;
downstream of CP&L Environmental Center.
^, If you have any questions regarding the study plan, please call me.

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