NC0004961_Request for Modification of Permit_19930215

x DIVISION OF ENVIRONMENTAL MANAGEMENT
Water Quality Section/Rapid Assessment Group
February 15, 1993
MEMORANDUM
M. Randy Kepler
THROUGH: Carla Sanderso
FROM: —Dave Goodrich
SUBJECT: Request for Modification of Six NPDES Permits
Ash Settling Pond Monitoring Reduction
Duke Power Company
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This is in response to Duke Power Company's January 19, 1993 letter to Coleen
Sullins. In that correspondence, Dayna Russell requested deletion of the required
monitoring for oil and grease and total suspended solids during rainfall events. The
specific permits included in consideration for this request are:
As
Allen Steam Station
NCO004979
0 3
Buck Steam Station
NC0004774
C? 31 -7
Cliffside Steam Station
NC0005088
O 3 0 �F
Dan River Steam Station
NCO003468
0 3 o Z D 3
Marshall Steam Station
NC0004987
pie �-
Riverbend Steam Station
NC0004961
03073 ----
3083
As stated in this letter, the permits allow the permittee to request the elimination of this
monitoring after a one year period in which data are collected. After reviewing the last 12
months of monitoring for all six facilities, it appears that the elimination of this monitoring
requirement will not have an adverse impact on water quality, and the request should be
granted. This modification of the above -referenced permits should not be construed as the
complete elimination of monitoring for oil and grease, and total suspended solids. Samples
for these parameters must still be collected twice per month. The permittee should also
continue to report the presence of cenospheres found in the samples.
cc: Mike Parker
Ron Linville
Jim Reid

3KEX78/MY
02/07/93
COMPLIANCE EVALUATION ANALYSIS REPORT
PERMIT--NC0004961 PIPE --002 REPORT PERIOD: 9201 -9212 LOC ---E
FACILITY --DUKE POWER CO., RIVERBEND S.E. DESIGN FLOW-- .0000 CLASS --1
LOCATION --MOUNT HOLLY Z 5- REGION/COUNTY--03 GASTON
50050 00530 00556
MONTH Q/MGD RES/TSS OIL-GRSE
92/01 1.7840 6.1 .100
92/02 2.1180 3.3 .330
92/03 1.6516 3.4 .196
92/04 1.9740 3.5 .113
92/05 2.9860 6.9 .226
92/06 2.9535 7.7 .020
92/07 2.9623 7.0 1.450
92/08 4.1300 9.2 .200
92/09 3.6220 10.7 .103
92/10 7.0728 12.7 .357
92/11 3.1840 5.7 .120
92/12 2.6820 8.9 .945
AVERAGE 3.0933 7.0 .346
MAXIMUM 10.6000 17.5 1.970
KINIMUM 1.0800 .4 LESSTHAN
JNIT MGD MG/L MG/L