A Dulce r• Energy

. August26,2010 Sue Wallace Tara Thomas Miami Fort Generating Station 11021 Brower Road North Bend, OH 45052 DUKEENERGYCORPORAnON CORPORATE EHS 13339 Hagers Ferry Road, B f dg
. 7 4 05 Huntersv

t fle, NC 280 7 8 Re: Miami Fort NPDES Permit OH0009873- Revision of laboratory Results for Outfall 608 Sue&Tara: For the permit effective July 1, 2009, analysis of Internal Monitoring Station 608 has been performed since July 2009

. During August and September
of 2009,
a study was completed
to approximate the effect of the FGD matrix on analytical results. The matrix has high concentrations

of total dissolved solids, sulfates and chlorides. Dilutions of the sample at preparation and before instrumental analysis aid in achieving acceptable quality control and analytical results. Method 200.8

( I CP-MS)

is more sensitive and therefore allows for greater dilutions at the instrument whHe maintaining

a lower reporting limit Ohio EPA allowed for the use of this method on some of the metals after reviewing

a summary of the study. This was approved

in September 2009

. Implementation

of these dilutions on the samples took place beginning

in September 2009

. During
a recent review of data and calculations,
an error was detected by the laboratory. For this sample site the dHution factor was not applied to the final analytical result. The process of dDuting
a sample before preparation

is not what is normally done for metals digestions

. Cala.dations for these dilutions were not included
at instrumental analysis or during final reporting of the data via the

l aboratory's information management system (LIMS). As a result, the reported values for many of the metals were 1/201h of the actual concentration

: due to not applying the 20X dDution factor from the sample preparation. Following our quality assurance program,

a corrective action has been initia

t ed to resolve the issue. The

f oi iOINing items YJere identified
to correct the **pr~em** 1 . Analytical results were recalculated using all dUution factors

. (Corrected concentrations
for the effected samples are attached
to this letter)

. 2 . For samples beginning

in September 2010 going forward

, diluti o n factors at sample preparation will be reflected
in the LIMS system and \WI be

i ncluded

i n the final calculation
of analytical results to be reported

. 3 . Program managers will review the calculations each month to ensure accuracy before reports are released by the laboratory

. 4 . Hard copies of the revised reports will be issued to Miami Fort Please do not hesitate to contact me with questions
or concerns

. www d uke

· energy .co maDulce[IIEnergy.•Page2DavidR.GreeneLaboratoryManager-DukeEnergyAnalyticalLaboratory(Office)980.875.4438(Pager)704.838.6575(Cell)704.838.6575E-maD:droreene@duke-enerav.comDUKEENERGYCORPORATIONCORPORATEEHS13339HagersFerry Road,Bldg.7405Huntersville,NC28078August26,2010Attachments:CorrectedAnalyticalResultsforOutfall608-MiamiFortStation.ccPatCoyle,RodneyWike,MargeGalvin-Karr,TroyWhisenant,PennyFranklinwww.duke-energycom

### Corrected Analytical

Results for Outfall 608

- Miami Fort Station Sep-09 

### ........... Ht!UJgd Ba!Hlrted **~grrected** .unil:l Sample Description: Miami Fort

- Outfall 608 Arseni
c EPA 200.8

< 1. 0 <20 ug/L Barium EPA 200.8 8.4 168 ug/L cadmium EPA 200.8 <1.0 <20 ug/L Laboratory Job #: 09 - SEP-0027 Chromium EPA 200.8

< 1. 0 <20 ug/L Copper EPA 200.8 <1.0 <20 ug/L Iron EPA 200.8 4.5
90 ug/L Laboratory Sample #: 29021644
Lead EPA 200.8

< 1.00 <20 ug/L Zinc EPA 200.8

< 1.00 <20 ug/L Oct-09 ADihWI Hmbgd Bi!Rill:bd **~rrect:ml** UDIIIi Sample Desaiptlon: Miami Fort

- Outfall 608 Arsenic
EP A 200.8
<1

. 0 <20 ug/L Barium EPA 200.8 7.7 154 ug/L Cadmium EPA 200

. 8 <1.0 <20 ug/L Laboratory Job #: 09 - 0CT-0029 Chromium EPA 200.8 <1.0 <20 ug/L Copper EPA 200.8 <1.0 <20 ug/L Iron EPA 200.8 15.1 302 ug/L Laboratory Sample #: 29023538
Lead EPA 200.8

< 1. 0 <20 ug/L Z in c EPA 200.8

< 2.00 <40 ug/L Nov-09 ADi!!llWI **Hmtu:~d ~IUU:tad**  **~rrect:ed** 11!!1§ Sample Description: Miami Fort

- Outfall 608 Arsenic EPA 200.8 <1.0 <20 ug/L Barium EPA 200.8

5

. 9 118 ug/L cadmium EPA 200.8

< 1. 0 <20 ug/L Laboratory Job #: 09-NOV

- 0031 Chromium EPA 200.8 <1.0 <20 ug/ L Copper EPA 200

. 8 <1.0 <20 ug/L Iron EPA 200.8 7.4 148 ug/L Laboratory Sample #: 29025225
Lead EPA 200.8 <1.0 <20 ug/L Zinc EPA 200.8 1.1
22 ug/L Dec-09

a .. ,. ...... **Hat~Jgd** bartect **~~~IDcted** Un.ID Sample Description: Miami Fort

- Outfall 608 Arsenic EPA 200.8 <1.0 <20 ug/L Barium EPA 200.8 5.5 110 ug/L cadmium EPA 200.8 <1.0 <20 ug/L Laboratory Job #: 09 - DEC

- 0031 Chromi um EPA 200

. 8

< 1. 0 <20 UQ/l Co pper EPA 200.8 <1.0 <20 ug/L Iron EPA 200

. 8 21.9 438 ug/L Laboratory Sample #: 29026933
Lead EPA 200

. 8 <1.0 <20 ug/L Zinc EPA 200

. 8
< 2

. 00 <40 ug/L Page
1 of 3Corrected Analytical Results for Outfall 608

- Miami Fort Station Jan-10 ADilbru2 M§l;bgd ReDOJ:l!:d **~rrec:ted** .unB:i Sample Desaiption: Miami Fort

- Outfall 608 Arsenic EPA 200.8

3
. 3 <20 ug/L cadmium EPA 200.8 1.00 <20 ug/L Laboratory Job #: 10-JAN

- 0042 Chromium EPA 200.8 7.4 <20 ug/L Copper EPA 200.8 1.3 <20 ug/L Laboratory Sample #: 30000111
Lead EPA 200.8

< 2.0 <40 ug/L Zinc EPA 200.8 5.3 <20 ug/L Feb-10 ADilbru2 Halb2d biHUDd **~grrected** Jlnlb Sample Desaiption:

Mi a mi Fort

- Outfall 608 Arseni
c EPA 200.8

< 1. 0 <20 ug/L Barium EPA 20 0.8

9 180 ug / L cad mium EPA 2 00.8

< 1.0 <20 ug/L Laboratory Job #: 10-FEB

- 00 2 7 Chromium EPA 20 0.8 <1. 0 <20 ug/L C opper

E PA 2 00

. 8

< 1.0 <20 ug/L Laboratory Sample #:

3 0001 62 6 Lead EPA 2 00.8 <2. 0 <40
ug / L Zinc EPA 2 00. 8 <2

. 0 <40 ug/L Mar-10 AmlhWI Hmbgd bRSIIDd **~ID5Dd** J.lnR:i Sample Desaiption: Miami Fort

- Outfall 608 Arsenic EPA 200. 8 <2.0 <40
ug / L Barium EPA 20 0.8

6 120 ug / L cadmium EPA 20 0.8

< 2.0 <40
ug / L Laboratory Job #:
10 - MAR

- 0 0 2 6 Chromium EPA 2 00. 8 <2

. 0 <40
ug / L Copper EPA 2 00

. 8 <2.0 <40
ug / L Laboratory Sample #: 30003367
Lead EPA 20 0.8

< 2 .0 <40 ug/L Zinc EPA 20 0.8

< 4.0 <80 ug/L Apr-10 ADi11¥1t1 Hmbgd **Reao~d** Corn!cted Unlla Sample Description: Miami Fort

- Outfall 608 Arsenic EPA 2 0 0.8 <1.0 <20
ug / L Barium EPA 2 00.8

5 .5 110 ug / L cadmium EPA 200.8 <1. 0 <20 ug/L Laboratory Job #: 10-APR-002

8 Chromium EPA 200.8

< 1.0 <20
ug / L Copper EPA 2 0 0.8 <1.0 <20
ug / L Laboratory Sample #: 30005479
Lead EPA 200.8 <1.0 <20 ug/L Zinc EPA 200

. 8 < 2
. 00 <40
ug / L Page 2 of 3

# Corrected Analytical

Results for Outfall 608- M
i ami Fort Station May-10 ADibmt Methgd B§JIUU:tt:d **~rrec:ted** u.nJb Sample Description: Miami Fort

- Outfall 608 Arsenic EPA 200.8 <1.0 <20 ug/L Barium EPA 200.8 6.6 132 ug/L Cadmium EPA 200.8 <1.0 <20 ug/L Laboratory Job #: 1Q-MAY-0027 Chromium EPA 200.8 1.1
22 ug/L Copper EPA 200.8 <1.0 <20 ug/L Laboratory Sample #: 30007150
Lead EPA 200.8 <1.0 <20 ug/L Zinc EPA 200.8

< 2.00 <40 ug/L 

## Jun-10 An1tua MgtiJgd Bgasu:md **~rrectgd** UD.I§ Sample Description: Miami Fort

- Outfall 608 Arsenic EPA 200.8 <1.0 <20 UQ/l Barium EPA 200.8 6.2 124 ug/L Cadmium EPA 200

. 8 <1.0 <20 ug/L Laboratory Job #: 10-JUN

- 0022 Chromium EPA 200.8 <1.0 <20 ug/L Copper EPA 200.8 <1.0 <20 ug/L Laboratory Sample #: 30008963
Lead EPA 200.8 <1.0 <20 ug/L Zinc EPA 200.8

< 2.00 <40 ug/L 

## Jul-10 Ao11m **Mm~Jgd** B,ggg£tgd **~gl]]lcted** .l.lnib. Sample Description: Miami Fort

- Outfall 608 Arsenic EPA 200.8 <1.0 <20 ug/L Barium EPA 200.8

8
. 9 178 ug/L Cadmium EPA 200.8 <1.0 <20 ug/L Laboratory Job #:
10 - JUL-0026 Chromium EPA 200.8 <1.0 <20 ug/L Copper EPA 200.8 1.4
28 ug/L Laboratory Sample #: 30010774
Lead EPA 200.8 <1.0 <20 ug/L Zinc EPA 200.8 <2.0 <40 ug/L 

## Aug-10

A 

# ... t:Jmbgd Bggg[ted **~m:cted** u.nJb Sample Description: Miami Fort

- Outfall 608 Arsenic EPA 200

. 8 <1.0 <20 ug/L Barium EPA 200.8 7.2 

### 144 ug/L Cadmium EPA 200

. 8 <1.0 <20 ug/L Laboratory Job #: 10 - AUG-0026 Chromium EPA 200.8

1 20 ug/L Copper EPA 200

. 8 <1.0 <20 ug/L Laboratory Sample#: 30012454
Lead EPA 200

. 8 <1.0 <20 ug/L Zinc EPA 200

. 8 < 2.00 <40 ug/L 

### Page 3of 3