NC0038377_Update to Pending Renewal_20150727

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striN DUKE Harry K.Sideris
Senior Vice President
ENERGY® Environmental,Health&Safety
526 S.Church Street
Mail Code:EC3XP
Charlotte, NC 28202
[phone]
July 22, 2015 RECEIVEDIDENRIDWR
Mr. Jeff Poupart JUL 2 7 2015
North Carolina Division of Water Resources Water Quality
1617 Mail Service Center Permitting Section
Raleigh, NC 27699-1617
Subject: Duke Energy Progress, Inc.
Mayo Electric Generating Plant
Update to pending NPDES renewal application and
Submittal of chemical characterization of water for dewatering ash basin
NC0038377
Person County
Dear Mr. Poupart:
In response to the request from the North Carolina Division of Water Resources, please find
attached a chemical characterization of ash basin free water and ash basin interstitial water for
the Mayo Electric Generating Plant. The analysis conducted and reported herein is consistent
with the information requested by NC DENR for other Duke Energy sites. This is submitted in
support of potential upcoming dewatering activities.
The results of analysis on the chemical characterization of the ash basin free water and ash basin
interstitial water are presented: 1.) without additional treatment beyond the treatment in the basin
and 2.) after additional treatment using different filter sizes. The following definitions may be
helpful for inclusion in a re-issued NPDES permit.
Ash basin free water: Water in an ash basin located above the settled layer of ash. Ash
basin free water has undergone treatment in the ash basin and has the same general
characteristics as water typically discharged from the ash basin.
Ash basin interstitial water: Water in an ash basin that is located within the pore space
of accumulated wastewater sludge or slurry.
If you have any questions, please contact Mr. Shannon Langley at [phone].

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Mr.Jeff Poupart
Mayo Free Water and Interstitial Water Submittal
July 22,2015
I certify, under penalty of law, that this document and all attachments were prepared under my
direction or supervision in accordance with a system designed to assure that qualified personnel
properly gather and evaluate the information submitted. Based on my inquiry of the person or
persons who manage the system, or those persons directly responsible for gathering the
information, the information submitted is, to the best of my knowledge and belief true, accurate,
and complete. I am aware that there are significant penalties for submitting false information,
including the possibility of fines and imprisonment for knowing violations.
Sincerely,
Harry K. Sideris
Senior Vice President
Environmental, Health & Safety
Enclosures
cc: Richard Baker, Director w/enclosure
Shannon Langley w/enclosure
Joyce Dishmon w/enclosure

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Mayo Energy Complex
Dewatering data submittal
June 2015
$amniepecalcNon ralallakell Aluminum(moIU AetYtmw(oa/LlAmid lll lethiaimuLL1 Boron(mgIL) Bromide Cadmium(ug/l) Calcium(mg/I)
Ma o Active Ash Basin 1 foot 06 08 15 0043 <1 3.31 0.066 1.70 0.7936 <1 43.0
Ma o Active Ash Basin 10 foot MIOMMIMIIII ••.. r®-" 43.0
Ma o Active Ash Basin 20 foot �•• •�-- •r r : r 44.6
Ma o Active Ash Basin 30 foot 06/08/15
45.8
Interstitial water no additional treatment 06/08/15 242 1.99 454 1.750 4.13 0.3800 1.52 102.0
Interstitial water 20 micron filter 06/08/15 9.53 1.78 304 0.366 3.86 0.3688 <1 84.0
Interstitial water 10 micron filter 06/08/15 1.08 1.13 303 0.322 3.89 0.3768 <1 84.3
Interstitial water 0.45 micron filter 06/08/15 0.032 <1 295 0.310 3.80 0.3673 <1 83.1
Ma o Active Ash Basin 1 foot IIIIMITIMIIIIIIE IIIM= 11173 ::)ITE :TSEIMINIME11 •111•17EMIIIMy-= -� --"- �t-- •-'----
Ma o Active Ash Basin 10 foot 06/08/15
Ma •Active Ash Basin 20 foot 06/08 15
Ma •Active Ash Basin 30 foot 06/08/15 • OIHM=
Interstitial water no additional treatment 06/08/15 • • ••• • •• 0.800
• 06/08/15 IIIMEIESIIMEN 20.80 0.4006 •. • ••
• 06/08/15 IIMEEEIM= 11111111116211111111111112M11111331111111110131=1111111111WIEM11111
Ma a Active Ash Basin 1 foot 06/08/15
Ma •Active Ash Basin 10 foot
Ma o Active Ash Basin 20 foot '' '®` •• ,•
Ma a Active Ash Basin 30 foot =MM.'.11111 TailliM11. 2110111111. :1106 .1.111X=IIIIMMIKEEMIMMII
Interstitial water no additional treatment •- •: :
•MEMEMII 060815 =MIMI=111111111 :1:11MIIMIIIMMIECEMMEIMINIE 131113• ..
MITIZEMEZE
• 1T7��
Interstitial water 0.45 micron filter Mu�i:LfSa •• :•• ••:•
$amole Descriotiaq Colledrd Date Sul(ata(eaa/L9 TDS(ma(L3 TuYllum(ua/L1 TIN(ma(Ll TSS(ma(LI Nanadunnlmoill Zlr•C(ma/Ll
Ma o Active Ash Basin 1 foot 06/08/15 59.40 330 <0.2 0.49 <5 1.88 0.005
Ma o Active Ash Basin 10 foot •• •: • • • ®" 0.006
Mayo Active Ash Basin 20 foot 06/08/15 63.95 330 <0.2 0.55 <5 1.12 0.015

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Ma o Active Ash Basin 30 foot 06 08 15 ' • .a
Interstitial water no additional treatment 06/08/15 32.78 400 2.69 2.4 7900 846 0.407
Interstitial water 20 micron filter 06/08/15 32.15 390 0.486 0.54 230 60.9 0.022
Interstitial water 10 micron filter 06/08/15 32.55 380 0.333 0.56 17 34.0 0.006
Interstitial water 0.45 micron filter 06/08/15 32.50 390 0.313 0.56 <5 32.1 <0.005