NC0003468_Submittal of Notification of New Seep_20150727

(; DUKE EHS CCP Environmental Programs
ENERGY. Duke Energy
CAROLINAS 526 South Church Street
Charlotte,NC 28202
Mailing Address:
EC13K/P.O.Box 1006
Charlotte,NC 28201-1006
July 17. 2015
Mr. Sergei Chemikov
North Carolina Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
RECEIVEDIDENRIDWR
Subject: Duke Energy Carolinas. Inc.
Dan River Energy Complex JUL 2 7 2015
Submittal of Notification of Potential New Seep
NC0003468 Water Quality
Rockingham County Permitting Section
Dear Mr. Chernikov,
Duke Energy is submitting this letter of Notification to outline the identification and investigation of a
potential new seep at Dan River.
On June 20.2015, Duke Energy personnel observed a potential new seep at the toe of the Primary Ash
Basin on the bank of the Dan River(in the vicinity of a bedrock well MW-22 BR).The potential seepage
flow was observed to be clear and emerging between rip rap armoring.The river flows into the rip rap
immediately upstream of the potential seep and an eddy was observed immediately downstream of the
potential seep. Based on river flow and large size of rip rap armoring,it was suspected that the potential
seep was actually river water flowing through voids in rip rap(from high pressure to low pressure).
Duke Energy personnel re-inspected area on June 21, 2015 and no change in conditions was observed. A
sample of the potential seepage flow and upstream river flow was collected on June 22,2015 for analysis
and comparison. The analytical results(see attached Table I -Potential Seep Confirmation Sampling)
indicated the contaminant concentrations between the sample of the potential seep and the sample of
upstream river flow are similar. Based on these analytical results,Duke Energy has determined that the
area of concern is not a potential new seep.
If you have any questions.please contact Ms.Joyce Dishmon at(336)623-0238.
Sincerely,
-7
eremy Pruett, PE
Manager-CCP Permitting and Compliance
Duke Energy, Inc.
Enclosure
cc: Richard Baker, Director. EHS CCP Environmental Programs
Joyce Dishmon, Senior Environmental Specialist,CCP Permitting and Compliance

Table 1 —Potential Seep Confirmation Sampling
Sample Date 6122/15
Parameter _ nits _ Potential Seep _ River Sample
Chloride mg/1 11 10
Fluoride mg/1 <0.1 <0.1
Sulfate mg/1 6.4 6.3
Mercury ug/1 <0.05 <0.05
Aluminum mg/I 0.655 0.492
Barium mg/1 0.03 0.025
Boron mg/I 0.211 0.213
Calcium mg/I 8.77 8.22
Iron mg/1 1.22 0.981
Magnesium mg/1 3.28 3.2
Manganese mg/1 0.095 0.074
Zinc mg/1 0.008 0.007
Antimony ug/I <1 <I
Arsenic ugh <1 <I
Cadmium ugh <1 <1
Chromium ug,/1 <1 <1
Copper ug/1 1.65 1.25
Lead ugh <1 <1
Molybdenum ug/1 <1 <1
Nickel ug/1 <I <1
Selenium ug/1 <1 <I
Thallium ugh <0.2 <0.2
Vanadium ugh 2.75 2.44