# Final Sampling Episode Report Ohio Power Company’s

Mitchell Plant Moundsville, WV
Sampling Episode 6550

Prepared for:



# U.S. Environmental Protection Agency

Engineering and Analysis Division
Office of Water 1200 Pennsylvania Avenue, NW Washington, D.C. 20460

Prepared by:



## Eastern Research Group, Inc. 14555 Avion Parkway
Suite 200 Chantilly, VA 20151

26 August 2008

EPA Contract No. 68-C02-095 Work Assignment 5-22

### i CONTENTS

Page

1. I NTRODUCTION 

### .................................................................................................................1-1 1.1 Background of Detailed Study.............................................................................1-1

1.2 Power Plant Site Selection...................................................................................1-1 1.3 Sampling Episode Overview................................................................................1-2

2. F ACILITY 

### O VERVIEW 

### ........................................................................................................2-1 2.1 FGD Scrubber System .........................................................................................2-2 2.2 FGD Wastewater Treatment System ...................................................................2-3 2.3 Particulate Control Systems.................................................................................2-5 2.4 Fly Ash Pond System...........................................................................................2-5

3. S AMPLE 

### C OLLECTION 

### .......................................................................................................3-1 3.1 Sampling Points, Sample Collection Methods, and Field Measurements ...........3-1

3.1.1 Influent to FGD Wastewat er Treatment System......................................3-2 3.1.2 FGD Primary Clarifier Effluent...............................................................3-4

3.1.3 Effluent from FGD Wastew ater Treatment System.................................3-5 3.1.4 Effluent from Fly Ash Pond.....................................................................3-7 3.2 List of Analytes and Sample Preservation...........................................................3-9 3.3 Plant Operational Data.......................................................................................3-10 3.4 Deviations from the Sampling and Analysis Plan .............................................3-10

4. L ABORATORY 

### A NALYTICAL 

### R ESULTS AND 

### D ISCUSSION 

### ...................................................4-1

4.1 Measured and Calculated Results for FGD Influent Samples .............................4-1 4.2 FGD Wastewater Treatment System ...................................................................4-2 4.3 Fly Ash Pond........................................................................................................4-3

5. D ATA 

### Q UALITY 

### .................................................................................................................5-1 5.1 Analytical Quality Control...................................................................................5-1 5.2 Field Quality Control ...........................................................................................5-1

5.2.1 Bottle Blanks............................................................................................5-1 5.2.2 Equipment Blanks....................................................................................5-2

5.2.3 Field Blanks .............................................................................................5-3 5.2.4 Field Duplicates .......................................................................................5-4

6. R EFERENCES 

### .....................................................................................................................6-1

Appendix A: A NALYTICAL 

### R ESULTS



### Appendix B: A NALYTICAL 

### D ATA FOR 

### M ETALS



### , FGD W ASTEWATER AND 

### A SH 

### P OND



### Appendix C: D ATA 

### R EVIEW 

### N ARRATIVES



### Appendix D: P ICTURES 

### F ROM THE 

### S AMPLING 

### E PISODE

### ii LIST OF TABLES

Page

3-1 Sample Collection Information, Mitchell ...................................................................... 3-12

3-2 Number of Samples Collected by Sampling Point, Mitchell......................................... 3-13

3-3 Field Measurements, Mitchell ....................................................................................... 3-14

3-4 Analytical Methods and Procedures for Samples Collected at Mitchell ....................... 3-15

3-5 Summary of Sample Containe r and Planned Preservation ............................................ 3-16

3-6 Sample Preservation Summary, Mitchell ...................................................................... 3-17

3-7 Generating Unit Operating Characteristics during Sample Collection, Mitchell .......... 3-19

3-8 FGD Scrubber System Operati ng Characteristics, Mitchell.......................................... 3-20

3-9 FGD Wastewater Treatment System Op erating Characteristics, Mitchell .................... 3-21

3-10 Ash System Operating Characteristic s During Sample Collection, Mitchell................ 3-22

3-11 Fly Ash Pond System Operating Characteristics, Mitchell ........................................... 3-23

4-1 Biphasic Sample Results for Low-Level Total Metals Measured Above the Report Limit, FGD Influent, Mitchell ......................................................................................... 4-4

4-2 Classical Pollutants Measured Above the Report Limit for the FGD Wastewater Treatment System, Mitchell............................................................................................. 4-5

4-3 Metals Measured Above the Report Li mit for the FGD Wastewater Treatment System, Mitchell .............................................................................................................. 4 -6

4-4 Classical Pollutants Measured Above the Report Limit for the Fly Ash Pond Effluent, Mitchell............................................................................................................. 4-9

4-5 Metals Measured Above the Report Limit for the Fly Ash Pond Effluent, Mitchell .... 4-10

5-1 Field Blank Results Measured A bove the Report Limit, Mitchell .................................. 5-5

5-2 Field Duplicate Re sults, Mitchell .................................................................................... 5-6

A-1 FGD Influent Analytical Data, Mitchell ......................................................................... A-1

A-2 FGD Primary Clarifier Effluent Analytical Data, Mitchell ............................................ A-6

A-3 FGD Effluent Analytic al Data, Mitchell....................................................................... A-11

A-4 Duplicate of FGD Effluent Analytical Data, Mitchell.................................................. A-16

### LIST OF TABLES (Continued)

Page

iii A-5 Fly Ash Pond Effluent Anal ytical Data, Mitchell......................................................... A-20

A-6 Bottle Blank and Equipment Bla nk Analytical Data, Mitchell..................................... A-24

A-7 FGD Influent Field Blank An alytical Data, Mitchell ................................................... A-30

A-8 FGD Primary Clarifier Effluent Fiel d Blank Analytical Data, Mitchell ...................... A-31

A-9 FGD Effluent Field Blank An alytical Data, Mitchell................................................... A-32

A-10 Fly Ash Pond Effluent Field Bla nk Analytical Data, Mitchell..................................... A-36

B-1 Analytical Results for Metals in the F GD Wastewater Treatment System, Mitchell......B-1

B-2 Analytical Results for Metals in the Fly Ash Pond Effluent, Mitchell............................B-3

### iv LIST OF FIGURES

Page

2-1 FGD Wastewater Treatment Syst em, Mitchell Power Plant ........................................... 2-7

D-1 Sampler Working Inside a “Cleanbox”........................................................................... D-1

D-2 Sample Collection Set-Up at the Influent to FGD Wastewater Treatment System........ D-2

D-3 Sample Tap and Tubing at th e FGD Clarifier Effluent................................................... D-3

D-4 Sample Collection Set-Up at the FGD Clarifier Effluent ............................................... D-4

D-5 Sample Collection Set-Up at the Effluent from FGD Wastewater Treatment System... D-5

D-6 Sample Collection Set-Up at the Effluent from the Fly Ash Pond................................. D-6

### 1-1 1. I NTRODUCTION



### The Engineering and Analysis Division (E AD) of the U.S. Environmental Protection Agency (EPA) has been conducting a program that c onsists of site visits and sampling at steam electric power plants to characterize raw wast ewaters generated by coal-fired steam electric power plants, as well as to eval uate treatment technol ogies and best management practices used to reduce pollutant discharges. This Sampling Episode Report (SER) describes the sampling activities that took place on October 15, 17, a nd 18, 2007, at Ohio Power Company’s Mitchell Plant (Mitchell), locate d in Moundsville, West Virginia (S ampling Episode 6550). The focus of Episode 6550 was to characterize the influent to and effluent from the flue gas desulfurization (FGD) wastewater treatment syst em, the primary clarifier overfl ow within the FGD wastewater treatment system, and the effluent from the fly ash pond at Mitchell.

1.1 Background of Detailed Study

Section 304(m) of the Clean Water Act (C WA) requires EPA to develop and publish a biennial plan that establishes a schedule for th e annual review and revision of national effluent limitations guidelines and standards (ELGs) required by CWA section 304(b). During EPA’s 2005/2006 review of ELGs, EPA determined that the steam electric power generating point source category (40 CFR Part 423) was the seco nd-largest discharger of toxic-weighted pollutants. EPA’s analyses indicated that the toxi c-weighted loadings were predominantly driven by metals present in wastewater discharges, and that the waste streams contributing the majority of the metals are associated with air pollution co ntrols. Other potential sources of metals include coal pile runoff, metal/chemical cleaning wastes , coal washing, and certain low-volume wastes.

In the 2005/2006 study, EPA noted certain data limitations that affected the Agency’s estimate of the potential hazards posed by disc harges from this category. Therefore, EPA

determined that further review of these discharges during the 2007/2008 ELG planning cycle

was warranted. EPA has concentrated its effo rts for the 2007/2008 study on better characterizing the sources generating the pollutant s responsible for the majority of the toxic-weighted pollutant loadings and available pollution control techno logies/practices for steam electric plants.

1.2 Power Plant Site Selection

EPA selected six coal-fired steam electric plants for wastewater sampling. EPA based the plant selection on the process configurations and ch aracteristics of the plants, as well as the site visits conducted for the study. The following charac teristics (not listed in any priority order) were used to select plants for sampling:

• 

### Coal-fired boilers;

• 

### Wet FGD scrubber system, including:

— Type of scrubber,

— Sorbent used,

— Year operation began,

— Chemical additives used,

— Forced oxidation process,

— Water cycling, and

— Solids removal process;

### 1-2 • 

### FGD wastewater treatment system;

• 

### Type of coal;

• 

### NOx controls;

• 

### Ash handling systems;

• 

### Ash treatment system; and

• 

### Mercury air controls.

EPA selected Mitchell for sampling based on the following site characteristics:

• 

### The plant is a coal-fired pow er plant that burns eastern bituminous coal in each of its two generating units;

• 

### The plant operates limestone forced oxidation wet FGD systems on both units;

• 

### The plant operates a segregated FGD wastewater treatment system, which includes the following steps:

— Desaturation (lime addition);

— Clarification;

— Equalization;

— Ferric chloride addition;

— Polymer addition; and

— Clarification.

• 

### The plant operates selective catalytic reduction (SCR) systems on both units (although the SCRs were not in servi ce during the sampling episode); and

• 

### The plant produces a commerc ial-grade gypsum by-product.

1.3 Sampling Episode Overview

On May 15, 2007, EPA and its technical contra ctor, Eastern Research Group, Inc. (ERG),

conducted a site visit at Mitchell. The purpose of the site visit was to learn about the wastewater treatment operations regarding the FGD scrubbe r purge and the fly ash pond and to gather information in order to collect wastewater samples at Mitchell. The information collected during

the site visit was used to create Sampling Plan, Ohio Power Company’s Mitchell Plant (Sampling Plan) [1], which describes the sample collection procedures used during the sampling episode.

For this sampling episode, EPA arrive d at Mitchell on Monday, October 15, 2007, to review the sampling points, determine the set-up for the sample collection, label sample bottles, and purchase any additional supplies needed for the sampling episode. EPA then collected the samples specified in the Sampling Plan on Wednesday and Thursday, October 17 and 18, 2007. The following personnel participated in EPA’s sample colle ction activities:

• 

### Ron Jordan, EPA/EAD;

• 

### Josh Hall, EPA/EAD;

• 

### TJ Finseth, ERG;

• 

### Sarah Holman, ERG; and

• 

### Jessica Wolford, ERG.

In addition, during the sample collection, EPA colle cted split samples with the Utility Water Act Group (UWAG), acting on beha lf of the plant.

### 2-1 2. F ACILITY 

### O VERVIEW



### Mitchell operates two coal-fired steam elect ric generating units and burns approximately four million tons of eastern bituminous coal pe r year. Units 1 and 2, which both came on line in 1971, each have a capacity of 800 megawatts (MW) a nd have been burning low-sulfur coal. The Mitchell plant is located on appr oximately 220 acres in Moundsvill e, WV, along the Ohio River. The American Electric Power Company (parent co mpany to Ohio Power Company) also owns an additional 1,625 acres of land ad jacent to the Mitchell plant.

Units 1 and 2 each have the following configuration:

• 

### Boiler;

• 

### Air preheater;

• 

### SCR system;

• 

### Trona injection;

• 

### Electrostatic precipitator (ESP); and

• 

### FGD scrubber system.

Mitchell recently retrofitte d each unit with a wet FGD scrubber system to control the sulfur dioxide (SO 2 

### ) releases from the plant. The Unit 1 and Unit 2 FGD systems were installed in April 2007 and January 2007, respectively. Addi ng the FGD scrubbers allows the plant to transition to a higher sulfur co al. At the time the sampling occurred, the plant had not fully transitioned to the higher sulfur coal, but was burning a blend of hi gh sulfur and low sulfur coals

to achieve a sulfur content of 2.5 lbs/MBTU and ha d been burning a blend of coal at this sulfur content for an extended period of time. The wet FGD scrubbers are designed to remove 98 percent of the SO 2 

### from the flue gas. Mitchell representa tives estimate the average amount of

SO 2 

### their scrubbers remove is sli ghtly lower than 98 percent due to the lower efficiency during startup and shutdown of the scrubbers. With th e recent addition of the FGD scrubber systems,

Mitchell also installed an FGD wastewater treatm ent system to control the discharges of the wastewater generated during the operation of the FGD scrubbers . Section 2.1 discusses the FGD system and Section 2.2 discusses the FGD wastewater treatment system.

In May 2007, Mitchell retrofitted both Units 1 and 2 with SCR systems to further control nitrogen oxide (NO

x 

### ) releases from the plant. The pl ant had previously installed low NO

x 

### burners

in the boilers in each unit to reduce the NO

x 

### emissions. The low NO

x 

### burners were installed on Unit 1 and Unit 2 in Spring 2006 an d Fall 2005, respectively. Currentl y, Mitchell is operating the SCRs only seasonally, from May 1 through Septem ber 30; therefore, the SCRs were not operating during the sampling episode. However, in the future, Mitchell will begin operating the SCR systems year-round. The flue gas still passes over the SCR catalyst even when the SCRs are not operating.

As the flue gas passes over the catalyst in th e SCR process, some of the sulfur dioxide is

oxidized to sulfur trioxide. Emissions of this sulf ur trioxide contribute to the formation of acid rain in the environment, as well as a blue plume. To remove the sulfur trioxide, Mitchell injects trona, a sodium-based carbonate (i.e., sodium car bonate and/or sodium bicarbonate) into the flue gas. Mitchell blows the trona into the flue gas as a dry powder downstream of the SCR but upstream of the electrostatic prec ipitators (ESPs). Mitchell does not operate the trona injection

### 2-2 system when the SCRs are not operating (i.e ., during nonozone season); therefore, the trona injection system was not operati ng during the sampling episode.

The ESPs at Mitchell are particulate contro l devices that remove 99.7 percent of the fly ash and other particulates from the flue gas. Th e fly ash and other partic ulates are collected in hoppers and sluiced to the fly ash pond. Section 2.3 discusses the ESPs and ash sluicing in more

detail and Section 2.4 discu sses the fly ash pond system.

2.1 FGD Scrubber System

Mitchell operates a wet FGD scrubber syst em on both Units 1 and 2, downstream of the ESP, to control the emission of sulfur dioxide from the unit. The plant uses a limestone slurry as the sorbent for sulfur dioxide absorption. Mitche ll receives the limest one via barge and has onsite ball mills to pulverize the limestone. After the limestone is pulverized, Mitchell dilutes it with water to approximately 25 to 30 percent solids (by weight) a nd holds it in the reagent slurry storage tank until it is pumped to the scrubbers.

The fresh limestone slurry is fed to the bottom of the scrubbers in the reaction tank. Mitchell pulls a mixture of the fresh slurry and some of the reacted product from the reaction tank and pumps it up to the various spray levels in the scrubber. This slurry is pressurized and sprayed downward into the scrubbe r vessel through spray nozzles. As the slurry falls downward and the flue gas flows countercurrent to the slurry, the sulfur dioxide contacts and reacts with the limestone particles and produces calcium sulfite , which continues to flow downward in the

scrubber until it reaches the reaction tank. Mitchell bubbles air through th e reaction tank to

oxidize the calcium sulfite to ca lcium sulfate (i.e., gypsum).

Mitchell intermittently blows down the gypsum slurry from the reaction tank to control

the solids concentration in the scrubber to between 18 and 22 per cent solids. Mitchell pumps the blowdown from the scrubber to two hydroclone feed tanks, each with a capacity of 0.75 million gallons. The gypsum slurry is stor ed in the two hydroclone feed ta nks for a short period of time during the blowdown of the scrubbe r (no more than a few hours) to allow for a continuous feed to the hydroclones, which im proves their performance.

Once there is enough volume in the hydroclone feed tanks, Mitchell begins dewatering the gypsum slurry by pumping the slurry to the hydroclones at a flow rate of 1,000 gallons per minute (gpm). Mitchell typically dewaters gypsum slurry for approximately 10 to 12 hours per day. The hydroclones separate solid gypsum from the water by centrifugal force. The solid gypsum is forced outward to the walls of th e hydroclones and falls dow nward, while the water exits the top of the hydroclones. The gypsum from the hydroclones is transferred to the vacuum filter belts. The supernatant water from the hydroclone is transferred to the dewatering hydroclone overflow head tank and is expected to contain approximately 5.7 percent solids.

Mitchell rinses the gypsum with river water as it is poured onto the vacuum filter belts. The vacuum filter belts dry the gypsum to a 96 to 97 percent solids product. After temporary storage on site, the gypsum is ha uled to a nearby wallboard manuf acturer for beneficial reuse. Mitchell operates two hydroclones in parallel an d two vacuum filter belt s in parallel, and each unit has a designated hydroclone and filter belt. E ach of the vacuum filter belts can produce 50 tons of gypsum per hour when the dewatering process is operating.

### 2-3 Mitchell analyzes the chlorides in the wa stewater that is sent to the dewatering hydroclone overflow head tank to determine whether the water should be di rected to the reclaim tanks and recycled back to th e reaction tank in th e scrubbers or tran sferred to the FGD wastewater treatment system. If the chlorides are less than 8,000 parts per million (ppm), then the water is directed back to the scrubbers; howev er, if the chlorides are greater than 8,000 ppm, then a portion of the water is sent to the first stage of the FGD wastewater treatment system. The

chlorides concentration in th e scrubber typically ranges from 5,500 to 8,500 ppm, with a maximum allowable concentration of 12,000 ppm. According to plant representatives, the wastewater is usually sent to the reclaim tank and recycled back to the scrubbers. However, over the course of a day, the plant typically pur ges the hydroclone overflow tank to the FGD wastewater treatment system for approximately six to eight hours during the day shift at a rate of 400 gpm; however, the flow rate and duration of the scrubber purge varies daily. Mitchell also has the capability of transferring water from th e reclaim tanks to the FGD wastewater treatment system, if needed.

2.2 FGD Wastewater Treatment System

The FGD wastewater treatment system is de signed to receive intermittent transfers of

FGD wastewater from the dewate ring hydroclone overflow head tank at a maximum flow rate of 550 gpm. The intermittent transfer s typically occur for six to ei ght hours over the course of a day; however, during the sampling episode, th e plant was purging the hydroclone overflow continuously to the FGD wastewater treatment syst em at a flow rate of approximately 500 gpm.

The plant operates the FGD wastewater treatment system 24 hours per day. Mitchell installed the wastewater treatment system to treat the wastewater discharge that is necessary to

control the concentration of chlorides in the scrubber system. The FGD wastewater treatment system contains the following treatment operations:

• 

### Desaturation (lime addition);

• 

### Primary clarification;

• 

### Equalization;

• 

### Ferric chloride addition;

• 

### Polymer addition; and

• 

### Secondary clarification.

Figure 2-1 presents a process flow diagram of the FGD wastewater treatment system, as well as the sampling locations for EPA’s sampli ng episode. The wastewater treatment system was built with some redundancy so that it would s till operate if one piece of equipment went out of service; therefore, the FGD wastewater treatment system has two of the following pieces of equipment operating in parallel:

• 

### Desaturation tank;

• 

### Primary clarifier;

• 

### Equalization tank; and

• 

### Secondary clarifier.

### 2-4 During normal operation, Mitchell ope rates all of the tanks and cl arifiers even though only one of each pair of tanks and clarifie rs is needed. When one of the pa ir is taken out of service, the

other redundant unit can stil l handle the maximum flow through the system.

The wastewater from the dewatering hydroclo ne overflow head tank is transferred to the

two desaturation tanks if the chlo ride levels in the wastewater are greater than 8,000 ppm. This wastewater is expected to be 5.7 percent solids and the pH is approximately 6.5 to 7.0. Mitchell adds hydrated lime to the wastewater to in crease the pH to between 8.2 and 8.7, which precipitates calcium sulfate.

From the desaturation tanks, the wastewater fl ows to the primary clar ifiers, which remove

most of the solids in the wastew ater. According to the plant’s de sign specifications, the primary clarifiers are designed to reduce the solids co ncentration in the wast ewater from 5.6 to 0.1 percent solids. During the sampling episode, one of the primary clarifiers was out of service for maintenance; therefore, only one of the primar y clarifiers was operating. The underflow from the primary clarifier is either transf erred to the sludge feed tanks or recycled back to the primary clarifier influent to improve solids formation by providing seed crystals for nucleation, which improves settling of the suspended solids.

The two overflow streams from the primary clar ifiers are first commingled, and then they are split again prior to entering the two equalization tanks. The e qualization tanks also receive filter press filtrate and recycled water from the effluent storage tank when the treatment system is not discharging. The equalization tanks equalize the flow prior to ferric chloride addition and secondary clarification. The flow from the tanks is controlled based on the level in the tank. Some of the water from the equalization tanks is also used to flush the sludge lines from the primary and secondary clarifiers when the sludg e pumps are shut down fo r an extended period of

time.

Mitchell adds ferric chloride to the wastewater in the ferric chloride mix tank to coagulate the fine particles in the solution and make them ea sier to remove in the secondary clarifier. The

wastewater from the ferric chloride mix tank is split and transferred to the two secondary clarifiers. As the wastewater is pumped to the secondary clarifiers, Mi tchell adds an anionic polymer. The polymer helps the solids in the wast ewater settle more easily in the secondary

clarifier. The underflow from the se condary clarifiers is completely recycled within the treatment system, with most of it being recycled to the prim ary clarifier. In additi on, some of the sludge is recycled to the ferric chloride mix tank to provide seed crystals to improve the coagulation/agglomeration. The secondary clar ifiers are designed to reduce the solids concentration from 0.3 to 0.003 percen t solids in the wastewater.

The overflow from the secondary clarifiers is commingled and transferred to the effluent storage tank. When the effluent storage tank is fu ll, the plant discharges the wastewater to the bottom ash pond. In the bottom ash pond, the FGD wastewater is commingled with bottom ash sluice water, cooling tower blowdown, stor m water runoff, and low-volume wastewater. However, when the effluent tank is not full, whic h typically occurs when the plant is not purging the hydroclone overflow to the FGD wastewater tr eatment system, the plant recycles the treated effluent in the storage tank back to the equali zation tanks to enable continuous flow through the treatment system components. The typical retent ion time for the entire treatment system is 34.5

hours. See Table 3-9 for the retention time fo r individual treatment system components.

### 2-5 EPA collected a sample of the influent to Mitchell’s FGD wastewater treatment system downstream of the dewatering hydroclone overflow head tank and upstream of the desaturation tanks (i.e., the sample was collected prior to a ny chemical addition). EPA collected an interim sample within the FGD wastewater treatment sy stem downstream of the primary clarifiers and upstream of the equalization tanks. In addition, EPA collected a sample of the effluent from the FGD wastewater treatment sy stem directly downstream of the effluent storage tank.

2.3 Particulate Control Systems

As the coal is combusted in the boilers, so lid, noncombustible constituents of the coal, referred to as ash, are generated. The heavier ash particles collect on the bottom of the boiler and are referred to as bottom ash. The finer ash partic les are light enough to be transferred out of the boiler with the flue gas exhaust and are referred to as fly ash. The bottom ash is removed from the bottom of the boiler using a st ream of sluice water that transports the particles to the bottom ash pond. The fly ash flows with the flue gas through the SCRs and is removed from the flue gas

in the ESP.

The ESP systems use high voltage to genera te an electric charge on the particles contained in the flue gas. The charged particle s then collect on a metal plate with an opposite electric charge. As the particles begin to layer on the metal plates , the plates are tapped/rapped to loosen the particles, which fall into collec tion hoppers. Each unit has multiple hoppers that collect ash from different places in the ESP. The hoppers located closer to the inlet of the ESP collect the larger fly ash particle s that are removed more easily a nd the hoppers located closer to

the outlet of the ESP collect the finer fly ash particles that ar e more difficult to remove. In addition, the hoppers at the inlet ty pically collect more fly ash than the hoppers at the outlet of

the ESP.

Mitchell continually sluices the fly ash from the collection hoppers with cooling tower

blowdown water or river water. The plant cycles through the co llection hoppers based on which hopper needs to be sluiced. Because they collect more fly ash than the outlet hoppers, the inlet hoppers are sluiced more frequen tly. Mitchell simultaneously sluice s the fly ash from both Units 1 and 2, taking approximately 1.5 hours to cycle through all of the hoppers for each unit. The bottom ash for each unit is sluiced two times a day.

2.4 Fly Ash Pond System

The fly ash pond system at Mi tchell receives the fly ash sluice water from Mitchell as well as the fly ash sluice water from Kamm er, another Ohio Power Company power plant

located one mile north of Mitchell. In additi on, the fly ash pond receives wastewater from a nearby coal washing preparation pl ant and treated acid mine drainage (AMD). The flow rates of

the influent streams to the Mitche ll fly ash pond are listed below:

• 

### Mitchell fly ash sluice stream - 6.05 million gallons per day (MGD);

• 

### Kammer fly ash sluice stream - 1.4 MGD;

• 

### Coal washing prepara tion plant - 2.3 MGD;

• 

### AMD treatment plant – 0.4 MGD;

• 

### Stormwater runoff – 32.4 MGD (maximum); and

• 

### Rainfall – 7 MGD (maximum).

### 2-6 At the time of sampling, the fly ash pond had an open water area of approximately 63.5 acres and a volume of approximately 1,863,000 c ubic yards. Based on 2007 data, the nominal retention time of the pond is approximately 38 days. Mitchell began using the pond in 1969. The pond is not lined and Mitchell does not dredge the fly ash from the pond; therefore, the pond is expected to be completely filled in approximate ly 10 to 25 years, depending on the operation of the coal washing prep plant and the AMD treatment plant.

The four waste streams that enter the fly as h pond all enter at differe nt locations in the pond. The two fly ash sluice streams enter the pond the farthest downstream, and therefore have the shortest residence time in the pond. As the wastewater flows thr ough the pond system, the solids and particulates settle out . In addition, the plant controls the cenospheres (f loating solids); using booms, the plant collects the cenospheres from the surface of the pond and sells them for

beneficial reuse. As the wastew ater reaches the end of the pond, th ere is a dam that controls the flow from the pond out to the channel where the wa stewater is discharged to Fish Creek. The ash pond has a retention time of 38 days.

EPA collected a sample of the effluent from Mitchell’s fly ash pond from the channel that discharges to Fish Creek. EPA did not collect a sample of the influent to the fly ash pond.

### 2-7Figure 2-1. FGD Wastewater TreatmentSystem, Mitchell Power Plant

### 3-1 3. S AMPLE 

### C OLLECTION



### During the Mitchell sampling episode, the sa mpling team followed the sample collection protocols specified in the Sa mpling Plan. Section 3.1 describes the sampling points, sample collection methods, and field measurements. Secti on 3.2 describes the list of analytes and the sample preservation procedures. Section 3.3 discu sses the plant operational data collected during the sampling episode. Finally, Section 3.4 discusse s any deviations from the planned sampling activities described in the Sampling Plan.

During the sampling episode, Unit 1 was tri pped and shut down at approximately 1245 on Wednesday, October 17, 2007. Due to the shutdow n of Unit 1, the sampling team collected

the effluent from the FGD wastewater treatment system samples as quickl y as possible after the shut down. According to plant personnel, Unit 1 began operating again at approximately 1800 on the same day (October 17) and was operating at full load by 0430 on October 18. In addition, the plant’s FGD scrubber purge was tripped at approximately 0655 on October 17. See Section 3.1.1 for more details regarding the FGD scrubber purg e trip and its affect on the FGD wastewater

treatment system.

3.1 Sampling Points, Sample Collectio n Methods, and Field Measurements

This section describes the sampling points, sample collection methods followed, and the field measurements obtained for this sampling episode. Additional details are available in Section 3 of the Sampling Plan. Fi gure 2-1 presents a flow diag ram of the plant’s wastewater treatment system, including sampling point locations.

Table 3-1 lists the sampling points, samp ling point descriptions, type of sample collection, sample collection date s and times, and the EPA Sample Control Center (SCC) sample

numbers. Table 3-2 lists the sa mpling point numbers and descri ptions, the number of samples collected, and the pollutant parame ters analyzed for this sampling episode. Table 3-3 presents the field measurement data collected from sampling point.

The sampling points for this episode were:

• 

### SP-1: Influent to FGD Wa stewater Treatment System;

• 

### SP-2: FGD Primary Clarifier Effluent;

• 

### SP-3: Effluent from FGD Wa stewater Treatment System;

• 

### SP-4: Effluent from Fly Ash Pond;

• 

### SP-5: Duplicate of Effluent from FG D Wastewater Treatment System (SP-3);

• 

### SP-6: Influent to FGD Wastewater Treatment Syst em (SP-1) Field Blank;

• 

### SP-7: FGD Primary Clarifier E ffluent (SP-2) Field Blank;

• 

### SP-8: Effluent from FGD Wastewater Treatment System (SP-3) Field Blank; and

• 

### SP-9: Effluent from Fly Ash Pond (SP-4) Field Blank.

For all the sampling points, EPA collected sp lit samples with Mitchell’s representative. EPA inserted a “Y” splitter into the sample tubi ng configuration at each sampling point to allow for split sample collection. For this sampling episode, EPA collected all analytes (other than HEM/SGT-HEM at all sampling points and BOD at the effluent from the FGD wastewater treatment system) as “true” splits (i.e., sa mples for the same analyte were collected

### 3-2 simultaneously). The HEM/SGT-HEM samples were either collected using a bottle dipper or directly from a sample tap and the BOD sample s at the effluent from the FGD wastewater treatment system were collected directly from the sample tap; therefore, for these samples, EPA and Mitchell’s representative collected duplicate sa mples, with one filling the bottle immediately

after the other.

At each of the nine sampling points, EPA co llected low-level metals sample fractions following EPA Method 1669 collection protocols. To collect these samples, EPA samplers donned Tyvek® suits and dust masks (dust masks we re worn until all low-level mercury samples had been collected). In addition, EPA set up a “c leanbox,” which consists of a portable plastic rectangular box with a shallow lip and a flip-top lid th at secures itself ope n with clips. The “cleanbox” is double-bagged with a clear inner bag, enclosed in a translucent outer bag. The “cleanbox” is handled using “clean hands / dirty hands” techniques, whereby the inner bag is handled only by the “clean hands” sampler. When the “cleanbox” is opened, the sampler is able to position his/her hands in th e box and pull the bag over the openi ng of the box, but is still able to see the sample bottles and tubing. The “cleanbox” mini mizes potential atmospheric contamination during sample collection. Figure D- 1, in Appendix D, is a picture of a sampler working inside a “cleanbox.” To collect samples, EPA placed the sample bottles and the inner bag into the “cleanbox” following the protocols specified in Method 1669, also referred to as “clean hands / dirty hands” protocols. Sampling staff filled the sample container and closed the sample bottle lid and inner bag as quickly as possible within the “clea nbox.” The sample bottles were then placed into the outer bag following the “clean hands / dirty hands” protocols.

3.1.1 Influent to FGD Wastewater Treatment System

The influent to FGD wastewater treatment sy stem (SP-1) was collected from a sample tap located on the wastewater piping downstream of the dewatering hydroclone overflow head tank and upstream of the desaturation tanks. Figure 2-1 identifies the sampling location for SP-1. Mitchell does not have an equalization tank prior to the first chemical addition in the wastewater treatment system; therefore, the samples collected at the sampling point were not equalized prior to collection. This sample was collected as a grab sample because, according to plant representatives, the wastewater characteristics of the purge to the wastewater treatment system are fairly consistent during the purge.

The sampling point was located outside, near the desaturation tanks. The sampling team did not set up a tent or tarps to cover the samp lers/samples from rain and/or wind. There was no rain during the sample collection; however, the samplers did note that the wind was blowing at an estimated 5 to 10 mph during some of the sa mple collection time peri od. In addition, during the sample collection, several cars drove past th e sampling point, approximately 50 feet from the sample collection area.

Prior to collecting the samples at the influe nt to the FGD wastewater treatment system (SP-1), the sampling team collected field blanks (SP-6) for low-level total mercury and low-level total metals. See Section 5.2.3 for a description of the field blank sample co llection procedures at the influent to the FGD wastewater treatment system.

After collecting the field blank samples, Mi tchell notified the samplers that the FGD scrubber purge was tripped at approximat ely 0655 on Wednesday, October 17, 2007, and the

### 3-3 plant was currently transferring service water to the desaturation tanks to remove the solid

residuals from the wastewater piping leading to the desatura tion tanks. According to plant personnel, the system began operating again at approximately 0720; therefore, the plant

transferred service water to the desaturation tanks for approximately 25 minutes at a flow rate of 400 gpm. After waiting approxima tely 25 minutes, the samplers checked the piping and observed that scrubber purge water was flowing thr ough the piping. The samplers then waited an additional 15 minutes before flushing the sa mple tap with 10 gallons of scrubber purge.

EPA collected the wastewater samples at th e influent to the FGD wastewater treatment system by attaching a 10-foot length of silicone tubing to the sample tap on the wastewater piping. The end of the silicone tubi ng had a “Y” splitter attached, with two additional lengths of silicone tubing attached to the “Y” splitter. After the samplers attached the silicone tubing to the sample tap, they opened the valve of the sample tap and purged the tubing for 90 seconds. Flow from the tap did not stop until all samples were collected (except HEM/SGT-HEM and the dissolved metals samples).

After the tubing was purged, the samplers filled a 10-liter container with sample, which was used later to pump off the low-level and rout ine dissolved metals samp le fractions. Once the 10-liter container was filled, one member of the sampling team transported the 10-liter container to the staging area to allow the solids in the wa stewater to settle while the remainder of the sampling team stayed at the sampling point a nd continued sample collection. Figure D-2, in Appendix D, is a picture of the sampling set-up at the influent to the FGD wastewater treatment

system.

EPA then collected the low-level total metals, low-level total and dissolved mercury, routine total metals, and the arsenic/selenium sp eciation samples in a “cleanbox,” as described in Section 3.1. The samplers then collected the BOD, Group I, and Group II samples by pouring the sample directly from the tubing into the sample bottles without using a “cleanbox.” To collect the HEM/SGT-HEM samples, the samplers shut off the valve for the sample tap, removed the tubing from the fitting, reopened the valve, and fi lled the sample bottles dire ctly from the tap to prevent any oil and grease adheri ng to the sides of the tubing.

During the sample collection, the sampling team collected an aliquot of sample for field testing. Sample pH and temperature were measur ed immediately at the sampling point using a pH meter and four-color pH paper. The four-color pH paper was us ed as an independent check of the pH meter to ensure that similar results were measured. After returning to the staging area, the sampling team took measurements of free and tota l residual chlorine using a colorimeter. Table 3-3 presents the field measurement data for the in fluent to the FGD wastew ater treatment system.

The sampling team then moved to the stag ing area, where a pump -off station was set up,

to collect the low-level and routine dissolved me tals samples. The pump-off station consisted of a length of Teflon® tubing attached to a length of silicone tubing, which was threaded through an ISCO peristaltic pump. The sampling team att ached a capsule filter to the silicone tubing, which was a short distance downstream of the pum p. The sampling team attached another short length of silicone tubing to the capsule filter e ffluent, which was attached to a “Y” splitter and two lengths of silicone tubing. Th is set-up allowed EPA to colle ct “true” split samples with Mitchell’s representatives. Prior to collecting any dissolved metals samples of the FGD wastewater influent, the samplers collected a fi eld blank sample (SP-6) for low-level dissolved

### 3-4 metals. See Section 5.2.3 for a description of the dissolved metals field blank sample collection at the influent to the FGD wastewater treatment system.

After collecting the field blank samples, th e sampling team transferred the end of the Teflon® tubing into the 10-liter c ontainer filled with wastewater from the influent to the FGD wastewater treatment system. By this time, the so lids in the wastewater had been settling for approximately 1.25 hours, and there was a layer of solids at the bottom of the container.

The samplers first purged the tubing and filter with sample for one minute (approximately 2 liters) and then collected the low-level dissolve d metals and routine dissolved metals samples. The samplers then installed a new capsule filter and purged the tubing and filter for 45 seconds (approximately 1.5 liters of sample ). The samplers then collected the routine hexavalent chromium sample.

3.1.2 FGD Primary Clarifier Effluent

The FGD primary clarifier effluent (SP-2) wa s collected from a sample tap located on the wastewater piping downstream of the point at which the two prim ary clarifier effluent streams commingle and upstream of the spli t to the equalization tanks. Figure 2-1 identifies the sampling location for SP-2. At the time that sampling occurre d, one of the primary cl arifiers was out of service; therefore, only one pr imary clarifier was operating, whic h likely did not affect the

wastewater treatment because each of the clar ifiers was designed to handle the maximum FGD wastewater treatment system flow rate. This samp le was collected as a grab sample because the flow from the primary clarifiers is continuous, and the desaturati on tanks and primary clarifiers provide some equalization of the waste stream. Because the sampling point was located inside,

there were no wind or rain conc erns during the sample collection.

Prior to collecting the samples at the FGD pr imary clarifier effluent (SP-2), the sampling team collected field blanks (SP-7) for low-level total mercury and low-level total metals. See Section 5.2.3 for a description of the field bl ank sample collection procedures at the FGD primary clarifier effluent.

EPA collected the wastewater samples at th e FGD primary clarifier effluent by attaching a 10-foot length of silicone t ubing to the sample tap on the wa stewater piping. The end of the silicone tubing had a “Y” splitte r attached, with two additional lengths of silicone tubing attached to the “Y” splitter. Figur e D-3, in Appendix D, is a picture of the tubing attached to the sample tap at the FGD clarifier effluent sampling point. After the samplers attached the silicone tubing to the sample tap, they opened the valve of the sample tap and purged the tubing for three minutes. Flow from the tap did not stop until all samples were collected (except HEM/SGTHEM and the dissolved metals samples).

The samplers then collected the low-level total metals, low-level total and dissolved mercury, routine total metals, and the arsenic/se lenium speciation samples in a “cleanbox,” as described in Section 3.1. The samplers then fill ed a 10-liter container with sample, which was used later to pump off the low-level and routin e dissolved metals sample fractions. Once the 10- liter container was filled, one member of the sa mpling team transported th e 10-liter container to the staging area to allow the solids in the wast ewater to settle while the remainder of the

### 3-5 sampling team stayed at the sampling point a nd continued sample collection. Figure D-4, in Appendix D, is a picture of the sampli ng set-up at the FGD clarifier effluent.

The samplers then collected the BOD, Group I, and Group II samples by pouring the sample directly from the tubing into the sample bottles without using a “cleanbox.” To collect the HEM/SGT-HEM samples, the samplers shut off the valve for the sample tap, removed the tubing from the fitting, reopened the valve, and fi lled the sample bottles dire ctly from the tap to prevent any oil and grease adheri ng to the sides of the tubing.

During the sample collection, the sampling team collected an aliquot of sample for field testing. Sample pH and temperature were measur ed immediately at the sampling point using a pH meter and four-color pH paper. The four-color pH paper was us ed as an independent check of the pH meter to ensure that similar results were measured. After returning to the staging area, the sampling team took measurements of free and tota l residual chlorine using a colorimeter. Table 3-3 presents the field measurement data for the FGD primary clarifier effluent.

The sampling team then moved to the stag ing area, where a pump -off station was set up,

to collect the low-level and routine dissolved me tals samples. The pump-off station consisted of a length of Teflon® tubing attached to a length of silicone tubing, which was threaded through an ISCO peristaltic pump. The sampling team att ached a capsule filter to the silicone tubing, which was a short distance downstream of the pum p. The sampling team attached another short length of silicone tubing to the capsule filter e ffluent, which was attached to a “Y” splitter and two lengths of silicone tubing. Th is set-up allowed EPA to colle ct “true” split samples with Mitchell’s representatives. Prior to collecting any dissolved metals samples of the FGD primary clarifier effluent, the samplers collected fiel d blank samples (SP-7) for low-level dissolved

metals and low-level hexavalent chromium. See Section 5.2.3 for a description of the dissolved metals field blank sample collection at the FGD primary clarifier effluent.

After the field blank samples were collecte d, the samplers transf erred the end of the Teflon® tubing into the 10-liter c ontainer filled with wastewater from the FGD primary clarifier effluent. By this time, the solids in the wast ewater had been settling for approximately 40

minutes.

The samplers first purged the tubing and filter with sample for 45 seconds (approximately 1.5 liters) and then collected th e low-level dissolved metals, lo w-level hexavalent chromium, routine dissolved metals, and routin e hexavalent chromium samples.

3.1.3 Effluent from FGD Wastew ater Treatment System

The effluent from the FGD wastewater treatment system (SP-3) was collected from a sample tap located on the wastewater piping downstream of the effluent storage tank and upstream of the valve that dir ects the effluent flow to the bottom ash pond or the equalization tanks. Figure 2-1 identifies the sampling location for SP-3. At the time the samples were collected, the plant was dischargi ng the FGD wastewater treatment system effluent to the bottom ash pond. This sample was collected as a grab sa mple because all the wastewater entering the effluent storage tank has been treated in the FGD wastewater treatment system and is discharged from the tank; therefore, the wastewater charac teristics should be fairly homogeneous. Because

### 3-6 the sampling point was located inside, there were no wind or rain concerns during the sample

collection.

Prior to collecting the samples at the efflue nt from the FGD wastew ater treatment system (SP-3), the sampling team collect ed field blanks (SP-8) for lo w-level total mercury, low-level total metals, and routine total me tals. See Section 5.2.3 for a description of the field blank sample collection procedures at the effluent from the FGD wast ewater treatment system.

As discussed in Section 3.0, Unit 1 was s hut down at approximately 1245 on October 17, 2007. EPA planned to collect the effluent from the FGD wastewater treatment system on October 18. After discussing the situation with the plant staff, EPA determined there was uncertainty whether there would be a scrubber pu rge to the FGD wastewater treatment system on October 18. Also, it was uncertain what effect that recirculating the effluent to the equalization tanks and continually retreating the wastewater would have on th e effluent quality. Therefore,

EPA decided to collect the e ffluent samples on October 17.

The samplers first collected the BOD, B OD QC, and BOD duplicate samples directly from the sample tap to ensure that the samp les were iced long enough to reach the correct temperature for shipment that day (to meet th e method-required hold tim e). In addition, the samplers also collected the HEM/SGT-HEM and HEM/SGT-HEM QC samples directly from the sample tap prior to collecting the other samp les. Because the BOD and HEM/SGT-HEM samples were collected directly from the sample tap, they were not collected as split samples with Mitchell’s representative; instead, they were collected as duplicate samples.

EPA collected the wastewater samples at the effluent from the FGD wastewater treatment system by attaching a 10-foot length of silicone tubing to the sample tap on the wastewater piping. The end of the silicone tubi ng had a “Y” splitter attached, with two additional lengths of silicone tubing attached to the “Y” splitter. After the samplers attached the silicone tubing to the sample tap, they opened the valve of the sample tap and purged the tubing for two minutes. Flow from the tap did not stop until all samples were co llected (except the dissolved metals samples).

The samplers collected the low-level total metals, low-level total and dissolved mercury, routine total metals, the QC and duplicate sample s for each analyte, and the arsenic/selenium speciation samples in a “cleanbox,” as described in Section 3.1. The samplers then filled two 10- liter containers with sample, which were used later to pump off the low-level and routine dissolved metals sample fractions. Once the 10-lit er containers were filled, one member of the sampling team transported the 10-liter containers to the staging area to allow the solids in the

wastewater to settle while the remainder of th e sampling team stayed at the sampling point and continued sample collection. Figur e D-5, in Appendix D, is a pict ure of the sampling set-up at

the effluent from the FGD wa stewater treatment system.

The samplers then collected the Group I a nd Group II samples, as well as the QC and duplicate samples for each analyte, by pouring th e sample directly from the tubing into the sample bottles without using a “cleanbox.”

During the sample collection, the sampling team collected an aliquot of sample for field testing. Sample pH and temperature were measur ed immediately at the sampling point using a pH meter and four-color pH paper. The four-color pH paper was us ed as an independent check of

### 3-7 the pH meter to ensure that similar results were measured. After returning to the staging area, the sampling team took measurements of free and tota l residual chlorine using a colorimeter. Table 3-3 presents the field measurement data for th e effluent from the F GD wastewater treatment
system.

The sampling team then moved to the stag ing area, where a pump -off station was set up,

to collect the low-level and routine dissolved me tals samples. The pump-off station consisted of a length of Teflon® tubing attached to a length of silicone tubing, which was threaded through an ISCO peristaltic pump. The sampling team att ached a capsule filter to the silicone tubing, which was a short distance downstream of the pum p. The sampling team attached another short length of silicone tubing to the capsule filter e ffluent, which was attached to a “Y” splitter and two lengths of silicone tubing. Th is set-up allowed EPA to colle ct “true” split samples with Mitchell’s representative. Prior to collecting any dissolved metals samples of the FGD wastewater effluent, the samplers collected field blank samples (SP-8) for low-level dissolved metals, low-level hexavalent chromium, routin e dissolved metals, and routine hexavalent chromium. See Section 5.2.3 for a description of the dissolved metals field blank sample

collection at the effluent from th e FGD wastewater treatment system.

After collecting the field blank samples, the samplers transferred the end of the Teflon® tubing into one of the 10-liter containers filled with wastewater from th e effluent from the FGD wastewater treatment system. By this time, the so lids in the wastewater had been settling for approximately one hour.

The samplers first purged the tubing and filter with sample for 50 seconds (approximately 1.5 liters) and then collected the low-level dissolved metals and low-level hexavalent chromium samples, as well as the QC and duplicate samples for each analyte. The samp lers then transferred the end of the Teflon® tubing into the other 10-lit er container, installed a new capsule filter, and purged the tubing and filter for 30 seconds (approxi mately 1 L of sample). The samplers then

collected the routine dissolved me tals and the routine hexavalent chromium samples, as well as the QC and duplicate samples for each analyte.

3.1.4 Effluent from Fly Ash Pond

The effluent from the fly ash pond (SP-4) was collected from the channel that discharges to Fish Creek. This sample was collected as a gr ab sample, because the wastewater is equalized through the long retention time within the fly ash pond; therefor e, the wastewater characteristics should be fairly homogeneous.

The samples were collected outside from a bridge built over the channel. The sampling team was located along the side of the channel. Because the sample location was outside, the samplers set up a tent to cover the samplers/s amples from rain; however, there was no rain during the sample collection.

Prior to collecting samples at the efflue nt from the fly ash pond (SP-4), the sampling team collected field blanks (SP-9) for low-leve l total mercury, low-level total metals, routine total metals, low-level dissolved metals, low- level hexavalent chromium, routine dissolved metals, and routine hexavalent chromium. See Section 5.2.3 for a de scription of the field blank sample collection at the e ffluent from the fly ash pond.

### 3-8 EPA collected the wastewater samples for the effluent from the fly ash pond by pumping samples from the channel into the sample contai ners. The sampling team attached one end of a 25-foot length of Teflon® tubing to a piece of PVC pipe, and inserted the PVC pipe and tubing into the channel. The sampling team attached the PVC pipe to a rail on th e bridge to secure the pipe and tubing in place for the duration of th e sample collection. The sampling team positioned the tubing to reach the sampling team at the samp ling point set-up area and attached it to a piece of silicone tubing, which was threaded through an ISCO peristaltic pump. The sampling team attached a “Y” splitter to the other end of the silicone tubing, with two additional pieces of silicone tubing attached to the “Y” splitter. Th e length of silicone tubi ng between the pump and the “Y” splitter consisted of two pieces with a small connector, which allowed EPA to attach and detach a capsule filter inline with the tubing configuration. The “Y” splitter allowed EPA to collect “true” split samples with Mitchell’s re presentative. Figure D- 6, in Appendix D, is a picture of the sampling set-up for the effluent from the fly ash pond.

After configuring the tubing for the sampli ng point, the samplers purged the tubing and filter with sample for approximately one minute. The samplers first collected the low-level dissolved metals and low-level hexavalent chromium samples, as well as the QC samples, because the capsule filter was al ready inline with the tubing configuration from the dissolved metals field blank sample collection. The samplers then installed a new capsule filter and purged the tubing and filter for one minute. After purging the new filter, the sampling team collected the routine dissolved metals, rou tine dissolved metals QC, and routine hexavalent chromium samples. Each of these samples was collected in a “cleanbox,” as de scribed in Section 3.1.

After collecting all the dissolved metals sa mples, the sampling team removed the capsule filter from the tubing configuration and purged the tubing for one minute. The samplers then collected the low-level total metals, low-level to tal and dissolved mercury, routine total metals, as well as the QC samples for each analyte, and arsenic/selenium speciation samples in a “cleanbox,” as described in Section 3.1. The samp lers then collected the BOD, Group I, and Group II samples, by pouring the samples directly from the tubing into the samples bottles without using a “cleanbox.”

The samplers used a bottle dipper to colle ct the HEM/SGT-HEM samples directly from the channel to prevent any oil and grease adhering to the sides of the t ubing. Therefore, EPA did not collect split samples with Mitchell’s repres entative for the HEM/SGT-HEM samples, but instead collected duplicate samples with Mitc hell’s representative. Two members of the sampling team collected the HEM/SGT-HEM samp les from the channel at approximately the same point within the channel at which the other samples were collected.

During the sample collection, the sampling team collected an aliquot of sample for field testing. Sample pH and temperature were measur ed immediately at the sampling point using a pH meter and four-color pH paper. The four-color pH paper was us ed as an independent check of the pH meter to ensure that similar results were measured. After returning to the staging area, the sampling team took measurements of free and tota l residual chlorine using a colorimeter. Table 3-3 presents the field measurement data for the effluent from the fly ash pond.

### 3-9 3.2 List of Analytes and Sample Preservation

Analytes in EPA’s Mitchell sampling episode included those in the following classes of pollutants:

• 

### Classicals:

— Biochemical oxygen demand, 5-day (BOD5),

— Total suspended solids (TSS),

— Total dissolved solids (TDS),

— Sulfate,

— Chloride,

— Total Kjeldahl nitrogen (TKN),

— Ammonia as nitrogen,

— Nitrate/nitrite as nitrogen,

— Total phosphorus,

— Hexane extractable material (HEM), and

— Silica-gel treated hexane extractable material (SGT-HEM); and

• 

### Metals:

— Routine total metals (27 metals: aluminum, antimony, arsenic, barium, beryllium, boron, cadmium, calcium, ch romium, cobalt, copper, iron, lead, magnesium, manganese, mercury, molybdenum, nickel, selenium, silver, sodium, thallium, tin, titanium, vanadium, yttrium, and zinc),

— Routine dissolved metals (27 metals),

— Routine hexavalent chromium,

— Low-level total mercury,

— Low-level dissolved mercury,

— Low-level hexavalent chromium,

— Low-level total metals (11 metals: antimony, arsenic, cadmium, chromium, copper, lead, nickel, sele nium, silver, thallium, zinc), and

— Low-level dissolved metals (11 metals).

The analytes selected reflect the curren t understanding of coal-fired power plant air pollution control wastewaters, in cluding contributions from coal , scrubber sorb ents, treatment chemicals, and other sources. Table 3-4 lists the analytical methods used to determine pollutant

concentrations.

Table 3-5 lists the containe rs used for sample collection as well as the preservation requirements for each sample and Table 3-6 summa rizes the chemical preservation for each of the samples that were preserved on site. The sampling team preserved samples in accordance with procedures described in S ection 3.4 of the Sampling Plan. A ll samples except routine total and dissolved metals, low-level total and dissolv ed metals, and low-level hexavalent chromium samples were placed on ice and cooled to <6°C immediately following collection. All dissolved metals samples, except low-level dissolved merc ury, were filtered in the field. The routine and low-level hexavalent chromium samples were pres erved in the field, but all other metals samples were acid-preserved prior to extraction at the laboratory. The routine hexavalent chromium samples were supposed to be preserved to a pH between 9.3 and 9.7 using an ammonium sulfate buffer solution; however, the sampling team disc ontinued preservation for some samples because 10 percent of the sample volume was added before the required pH was achieved (the pH of the

### 3-10 preserved samples was approximately 9.0). The lo w-level hexavalent chromium sample bottles were prepreserved with 2 mL of 50-percen t NaOH. The Group II and HEM/SGT-HEM samples were preserved with sulfuric acid to a pH of <2 immediately afte r collection in the staging area, and the pH was confirmed with four-color pH strips.

3.3 Plant Operational Data

During the sampling episode at Mitchell, plant personnel provided the sampling team with operational data for each of the generating units, the FGD scrubber system, and the ash collection system, as well as operational and flow data for the FGD wastewater treatment system and the fly ash pond. Table 3-7 presents the unit ope rating characteristics, Table 3-8 presents the FGD scrubber system operating characteristics, Table 3-9 presents the FGD wastewater treatment system operating characteristics, Table 3-10 presents th e ash system operating characteristics, and Table 3-11 presents the fly ash pond operating char acteristics during the sampling episode.

As noted in Section 3.0, Unit 1 was shut dow n during the sampling ep isode. According to plant personnel, the un it was tripped and forced to shut down, which was caused by an outside contractor working at the switchyard control bui lding. After the plant determined the cause of trip, the unit was “hot” restarted. Unit 1 wa s shut down on Wednesday, October 17, 2007 at 1245 and began operating again at approximately 1800 on the same day. By 0430 on October 18, the unit was operating at full load. In addition, th e plant’s FGD scrubber purge was tripped at approximately 0655 on October 17; however, the plan t was able to restart the purge within 20 minutes after the purge was tripped. Plant perso nnel were unable to determine the cause of the trip to the plant’s FGD scrubber purge.

3.4 Deviations from the Sampling and Analysis Plan

The sampling episode proceeded as specified in the Sampling Plan with the exceptions

described below:

• 

### Collection Containers for Dissolv ed Metals at SP-1 and SP-2. For the influent to the FGD wastewater treatment system (SP-1) and the FGD primary clarifier effluent (SP-2), EPA planned to collect volume for the pump off of sample to be analyzed for routine and low-level dissolv ed metal analytes into two precleaned 10-liter containers. However, EPA collect ed the volume into one precleaned 10- liter container, which was sufficient volume for sample collection.

• 

### Dissolved Metals Sample Filtration Time. For the influent to the FGD wastewater treatment system (SP-1), EPA planned to filter the dissolved metals samples approximately one hour after filli ng the 10-liter container with sample; however, the samples weren’t filtered until approximately one hour and 20 minutes later. In addition, for the FGD primary clarifier effluent (SP-2) and

effluent from the FGD wastewater treatme nt system (SP-3), EPA planned to filter the dissolved metals samples 15 minutes after filling the 10-liter containers with sample; however, the FGD clarifier efflue nt (SP-2) samples weren’t filtered until

40 minutes later and the effluent from th e FGD wastewater treatment system (SP3) samples weren’t filtered until one hour later.

### 3-11 • 

### Sample Collection Order at FGD Effluent (SP-3). EPA planned to collect the BOD and HEM/SGT-HEM samples after co llecting the low-level and routine metals samples at the effluent from the FGD wastewater treatment system (SP-3). However, as discussed in Section 3.0, Unit 1 shut down at 1245 on October 17, 2007. Because of the shut-down, EPA deci ded to collect the FGD effluent samples on October 17 rather than October 18 as originally planned to ensure that representative samples were collected. Sa mple collection began at approximately 1430. Because the BOD samples have a 48-hour hold time, the samples must be shipped the day of sample collection and must be shipped at a temperature of

≤ 6 E C. For this reason, EPA decided to co llect the BOD samples first, so the samplers could begin cooling the sample and preparing the sample for shipment. In order to collect the BOD sample firs t and not contaminate the tubing for the low-level metals sample collection, EPA de termined that the sample would have to be collected directly from the sa mple tap, without using sample tubing. Therefore, EPA and Mitchell’s represen tative collected duplicate samples of BOD. In addition, because the BOD sample s were collected from the sample tap first, EPA decided to also collect the HEM/SGT-HEM samples at the same time, because they were collected usi ng the same sampling technique.

• 

### Preservation of Routine Hexavalent Chromium. The routine hexavalent chromium samples were supposed to be preserved to a pH between 9.3 and 9.7 using an ammonium sulfate buffer solution; however, for some of the samples, preservation was discontinued because 10 percent of the sample volume was added before the required pH was achieve d (the pH of these preserved samples was approximately 9.0).

### 3-12 Table 3-1. Sample Collection Information, Mitchell

Sampling

Point Number Sampling Point Description Type of Sample Sample Collection

Date and Time SCC Number

SP-1 Influent to FGD Wastewater Treatment System Grab 10/17/2007

0800 a and 0920 b 70620

SP-2 FGD Primary Clarifier Effluent Grab 10/17/2007

1030 a and 1127 b 70621

SP-3 Effluent from FGD Wastewater Treatment System Grab 10/17/2007

1434 a and 1602 b 70622

SP-4 Effluent from Fly Ash Pond Grab 10/18/2007

0913 70623

SP-5 Duplicate of Effluent from FGD Wastewater Treatment System Grab 10/17/2007

1434 a and 1602 b 70624

SP-6 Influent to FGD Wastewater Treatment System Field Blank Grab 10/17/2007

0702 a and 0915 b 70625

SP-7 FGD Primary Clarifier Effluent Field

Blank Grab 10/17/2007

1017 a and 1120 b 70626

SP-8 Effluent from FGD Wastewater Treatment System Field Blank Grab 10/17/2007

1414 a and 1548 b 70627

SP-9 Effluent from Fly Ash Pond Field Blank Grab 10/18/2007

0844 70628

a – Collection of the total metals samples (low-level an d routine), low-level total and dissolved mercury, and

classicals. b – Collection of the dissolved metals samples (except low-level dissolved mercury).

### 3-13Table 3-2. Number of Samples Collected by Sampling Point, MitchellSamplingPointNumberSampling Point Description Low-Level Total Metals (11 analytes) Low-Level Dissolved Metals (11 analytes) Low-Level Total Mercury Low-Level Dissolved Mercury Low-Level Hexavalent Chromium Routine Total Metals (27 analytes) Routine Dissolved Metals (27 analytes) BOD 5 Group I

a Group II b HEM / SGT-HEM Routine Hexavalent Chromium Selenium/Arsenic Speciation

cSP-1 Influent to FGD WastewaterTreatment System1 1 1 1 1 1 1 1 1 1 1 1+dupSP-2 FGD Primary Clarifier Effluent 1 1 1 1 1 1 1 1 1 1 1 1 1+dupSP-3 Effluent from FGD WastewaterTreatment System 1+QC 1+QC 1+QC 1+QC 1+QC1+QC 1+QC 1+QC 1+QC1+QC 1+QC 1+QC 1+dupSP-4 Effluent from Fly Ash Pond 1+QC 1+QC 1+QC 1+QC 1+QC 1+QC 1+QC 1 1 1 1 1 1+dupSP-5 Duplicate of Effluent from FGDWastewater Treatment System 1 1 1 1 1 1 1 1 1 1 1SP-6 Influent to FGD WastewaterTreatment System Field Blank 1 1 1SP-7 FGD Primary Clarifier Effluent 1 1 1 1SP-8 Effluent from FGD WastewaterTreatment System Field Blank 1 1 1 1 1 1 1SP-9 Effluent from Ash Pond Field Blank 1 1 1 1 1 1 1Total Number of Samples 9+2QC 9+2QC 9+2QC 5+2QC4+2QC 7+2QC 7+2QC 5+1QC 5+1QC 5+1QC 4+1QC 7+1QC 4+4dupa – Group I includes total suspended solids (TSS), total dissolved solids (TDS), sulfate and chloride.b – Group II includes ammonia as nitrogen,nitrate/nitrite as nitrogen, total Kjeldahl nitrogen (TKN), and total phosphorus.c –The selenium/arsenic speciation results from the sampling episodewere not available at the timethis report was finalized andtherefore are not included in this report.

### 3-14Table 3-3. Field Measurements, MitchellTemp°CpH(S.U.)SamplingPointNumberSampling PointDescriptionTimeMeterThermometerMeteraStripsFreeChlorine(mg/L)TotalChlorine(mg/L)ManganeseInterferenceReading(mg/L)WasteStreamFlow Rate(GPM)SP-1 Influent to FGDWastewater TreatmentSystem082741.144 6.75 7 0.57 0.11 0.24 502bSP-2 FGD Primary ClarifierEffluent104834.638 8.52 9 2.20b 0.77 NA NMSP-3 Effluent from FGDWastewater TreatmentSystem150433.334 8.56 9 2.20b 0.62 2.20c541dSP-4 Effluent from Fly AshPond094718.2NA 8.55 8 0.01 0.02 NA 5407ea – The pH meter was calibrated on the morning of October 17 and 18, 2007 using pre-packaged buffer solutions at pHs 4.0, 7.0,and 10.0.b – Based on the average flow value for the influent to the FGD wastewater treatment system on the day of sampling (October 17,2007), provided by the plant.Note: The average flow value the day before sampling was 538 gpm.c – The test resulted in a “limit” reading.d – Based on the average flow value for the effluent from the FGD wastewater treatment system on the day of sampling (October 17, 2007), provided by theplant. Note: The average flow value the day before sampling was 530 gpm.e – Based on three measurements collected from the flume during the sampling episode.NA – Not analyzed.NM – Not measured.

### 3-15 Table 3-4. Analytical Methods and Proce dures for Samples Collected at Mitchell

Method Number Parameter Method Type

Classicals

SM 5210 B Biochemical Oxygen Demand (BOD5) Probe

SM 2540 D Total Suspended Solids (TSS) Gravimetric

SM 2540 C Total Dissolved Solids (TDS) Gravimetric

ASTM D516-90 Sulf ate Turbidimetric

SM 4500–Cl–C Chloride Titrimetric, mercuric

nitrate

SM 4500—NH3 F (18th ed.) Ammonia as Nitrogen Distillation, potentiometric

SM 4500—NO3 -H Nitrate/Nitr ate as Nitrogen Autoanalyzer

SM 4500—N, C (18th ed.) Total Kjeldahl Nitrogen (TKN) Digestion, distillation, potentiometric

EPA 365.3 (Rev 1978) Total Phosphorus Digestion, spectrophotometric

EPA 1664A Hexane Extractable Material (HEM) Gravimetric

EPA 1664A Silica Gel Treated Hexane Extractable Material (SGT-HEM) Gravimetric

Metals

EPA 1631 Mercury in Water by Oxidation, Purge and Trap, and Cold Vapor Atomic Fluorescence Spectrometry Oxidation, Purge and Trap, and CVAFS

EPA 1636 Determination of Hexavalent Chromium by Ion Chromatography Ion Chromatography

EPA 1638 Determination of Trace Elements in Ambient Waters by Inductively Coupled Plasma – Mass Spectroscopy (includes antimony, arsenic, cadmium, chromium, copper, lead, nickel, selenium, silver, thallium, and zinc) ICP/MS

EPA 200.7, 245.1 Metals by Inductively Coupled Plasma Atomic Emission Spectrometry, and Atomic Absorption Spectroscopy ICP and CVAA

ASTM D1687-92 Hexavalent Chromium Colorimetric

CVAFS – Cold vapor atomic fluorescence spectrometry. ICP/MS – Inductively coupled plasma with mass spectrometry. ICP – Inductively coupled plasma. CVAA – Cold vapor atomic adsorption.

### 3-16 Table 3-5. Summary of Sample Co ntainer and Planned Preservation

Parameter Sample Container and Volume On-Site Preservation

Classicals

BOD 5 One 1-L plastic bottle ≤ 6°C

Group I a Two 1-L plastic bottles ≤ 6°C

Group II b Two 1-L plastic bottles H 2 SO 4 to pH <2, ≤ 6°C

HEM/SGT-HEM Two 1-L wide mouth glass jars H 2 SO 4 to pH <2, ≤ 6°C

Metals

Routine total metals, 27 element quantitation (Method 200.7, 200.8, 200.9, 245.2) One 500-mL plastic bottle None (acid preserve at laboratory)

Routine dissolved metals, 27 element quantitation (Method 200.7, 200.8, 200.9, 245.2) One 500-mL plastic bottle 0.45 μm filter (performed in field) (acid preserve at laboratory)

Routine hexavalent chromium One 250-mL plastic bottle 0.45 μm filter (performed in field) Ammonium sulfate buffer to pH 9.3 – 9.7, ≤ 6°C

Low-level total mercury (Method 1631) One 250-mL glass (ultraclean), fluoropolymer lined cap None (acid preserve at laboratory)

Low-level dissolved mercury (Method 1631) Two 250-mL glasses (ultraclean), fluoropolymer lined caps None (acid preserve and filter at laboratory)

Low-level total elements by ICP/MS (11 elements, Method 1638) One 250-mL LDPE (ultraclean), fluoropolymer lined cap None (acid preserve at laboratory)

Low-level dissolved elements by ICP/MS (11 elements, Method 1638) Two 250-mL LDPE (ultraclean), fluoropolymer lined caps 0.45 μm filter (performed in field) (acid preserve at laboratory)

Low-level hexavalent chromium (Method 1636) One 250-mL LDPE (ultraclean), fluoropolymer lined cap 0.45 μm filter (performed in field) 2 mL 50% NaOH per 250 mL sample (performed in field) c

Selenium/arsenic speciation Two 125-mL amber glasses (ultraclean) None for original sample, ≤ 6°C Duplicate: HCl to pH <2, ≤ 6°C

a – Group I includes TSS, TDS, sulfate, and chloride. b – Group II includes ammonia as nitrogen, nitrate/nitrite as nitrogen, TKN, and total phosphorus. c – Method 1636 has a preservation requirement that the low-level hexavalent chromium sample be cooled to ≤ 6 E C; however, EPA did not cool the low-level hexavalent chromium samples due to contamination concerns.

### 3-17 Table 3-6. Sample Preservation Summary, Mitchell

Sampling Point

Number Analysis Date Chemical Initial pH Final pH Amount

Added

70620 Group II V1 10/17/07 H 2 SO 4 7 2 100 drops

70620 Group II V2 10/17/07 H 2 SO 4 7 2 100 drops

70620 HEM/SGT-HEM V1 10/17/07 H 2 SO 4 7 2 150 drops

70620 HEM/SGT-HEM V2 10/17/07 H 2 SO 4 7 2 150 drops

70620 Routine Hexavalent

Chromium 10/17/07 Ammonium

Sulfate Buffer 7 9 250 drops a

70620 Arsenic/Selenium Speciation (Duplicate) 10/17/07 HCl 7 2 30 drops

70621 Group II V1 10/17/07 H 2 SO 4 9 2 60 drops

70621 Group II V2 10/17/07 H 2 SO 4 9 2 60 drops

70621 HEM/SGT-HEM V1 10/17/07 H 2 SO 4 9 2 80 drops

70621 HEM/SGT-HEM V2 10/17/07 H 2 SO 4 9 2 80 drops

70621 Routine Hexavalent

Chromium 10/17/07 Ammonium

Sulfate Buffer 9 9.5 250 drops

70621 Arsenic/Selenium Speciation (Duplicate) 10/17/07 HCl 9 2 30 drops

70622 Group II V1 10/17/07 H 2 SO 4 9 2 60 drops

70622 Group II V2 10/17/07 H 2 SO 4 9 2 60 drops

70622 Group II MS/MSD V1 10/17/07 H 2 SO 4 9 2 80 drops

70622 Group II MS/MSD V2 10/17/07 H 2 SO 4 9 2 80 drops

70622 HEM/SGT-HEM V1 10/17/07 H 2 SO 4 9 2 80 drops

70622 HEM/SGT-HEM V2 10/17/07 H 2 SO 4 9 2 80 drops

70622 HEM/SGT-HEM MS/MSD

V1 10/17/07 H 2 SO 4 9 2 80 drops

70622 HEM/SGT-HEM MS/MSD

V2 10/17/07 H 2 SO 4 9 2 80 drops

70622 Routine Hexavalent

Chromium 10/17/07 Ammonium

Sulfate Buffer 9 9.5 250 drops

70622 Routine Hexavalent

Chromium MS/MSD 10/17/07 Ammonium

Sulfate Buffer 9 9.5 250 drops

70622 Arsenic/Selenium Speciation (Duplicate) 10/17/07 HCl 9 2 20 drops

70623 Group II V1 10/18/07 H 2 SO 4 8 2 100 drops

70623 Group II V2 10/18/07 H 2 SO 4 8 2 100 drops

70623 HEM/SGT-HEM V1 10/18/07 H 2 SO 4 8 2 120 drops

70623 HEM/SGT-HEM V2 10/18/07 H 2 SO 4 8 2 120 drops

70623 Routine Hexavalent

Chromium 10/18/07 Ammonium

Sulfate Buffer 8 9 250 drops a

70623 Arsenic/Selenium Speciation (Duplicate) 10/18/07 HCl 8 2 30 drops

70624 Group II V1 10/17/07 H 2 SO 4 9 2 60 drops

70624 Group II V2 10/17/07 H 2 SO 4 9 2 60 drops

### 3-18 Table 3-6. Sample Preservation Summary, Mitchell

Sampling Point

Number Analysis Date Chemical Initial pH Final pH Amount

Added

70624 Routine Hexavalent

Chromium 10/17/07 Ammonium

Sulfate Buffer 9 9.5 250 drops

70628 Routine Hexavalent

Chromium 10/18/07 Ammonium

Sulfate Buffer 8 9 250 drops a

a – Preservation of this sample was stopped due to excessive buffering of the sample. The pH of the sample was not changing with the addition of the ammonium sulfate buff er solution; therefore, the preservation was stopped to prevent the sample from being diluted by the preservative.

### 3-19Table 3-7. Generating Unit Operating Characteristics during Sample Collection, MitchellUnitIDBoilerTypeCoal TypeAmountof CoalUsed(tpd)Source of Coal(Coal Regionand/or State)SulfurContent ofthe Coal(lbs SO2/MBTU)Capacity(MW)ElectricityProduction (orPercentCapacity)SCR(No, On,Off)ParticulateControlSystem(HS/CS ESP,or BH)Wet FGDSystem(Yes/No)1aSupercriticalwall-firedEasternBituminous blendof high and lowsulfur coalb5,500cHigh Sulfur:N. WVLow Sulfur:S. WV2.95 800 798 (100% on10/16)459 (57% on10/17)OffdHS ESP Yes2 Supercriticalwall-firedEasternBituminous blendof high and lowsulfur coalb5,500cHigh Sulfur:N. WVLow Sulfur:S. WV2.61 800 844 (106% on10/16)825 (103% on10/17)OffdHS ESP Yesa – Unit 1 was tripped and went down at approximately 1245 on 10/17 and came back up at approximately 1800 on the same day. Unit 1 was back to full load by0430 on 10/18/07.b – At the time of sample collection, the plant was using a 50/50 blend of high sulfur and low sulfur coal.c – Amount of coal was estimated based on 4 million tons of coal per year assuming a 50% split between both units. Actual coalburned was 11,940 tpd on10/16/07 and 7,883 tpd on 10/17/07.d – SCRs were turned off on September 30.HS ESP – Hot-side electrostatic precipitator.

### 3-20Table 3-8. FGD Scrubber System Operating Characteristics, MitchellUnitIDType ofScrubberSorbentAdditives (DBA,Formic Acid, etc.)FGD Make-upWater SourceSO2RemovalPercentage(%)ForcedOxidation(Yes/No)Percent Solids inAbsorber Blowdown(%)Type of SolidsSeparation1 Spray/tray Limestone none Ohio River >97 Yes 19.8 - 23 Hydro-cyclones2 Spray/tray Limestone none Ohio River >97 Yes 19.8 - 23 Hydro-cyclones

### 3-21 Table 3-9. FGD Wastewater Treatment System Operating Characteristics, Mitchell

FGD Solids Dewatering (for last cycle prior to sampling or while sampling)

Scrubber slurry blowdown flow rate 1,000 gpm

Scrubber slurry blowdown duration Approximately 10-12 hr/day

Scrubber slurry blowdown percent solids 19.8% – 23%

Dewatering cycle frequency Approximately 10-12 hr/day

Time since last cycle Unable to estimate

Percent filtrate recycled back to scrubber Unable to estimate

FGD Wastewater Treatment System Op eration During Sa mple Collection

Scrubber purge flow rate 502 gpm a

Scrubber purge duration Continuous

Scrubber purge percent solids 0.6% (5.7% design basis) b

Lime addition 50 pounds/hr of lime slurry; adjusted to maintain pH of 8.5

in desaturation tanks

Ferric chloride addition Added to maintain concentration of 22 ppm in ferric

chloride mix tank

Anionic polymer addition Added to maintain concentration of 3 ppm in secondary

clarifiers

Sulfuric acid addition Added as needed to maintain pH between 8.0 and 8.5 in

effluent

Amount of solids generated 2.5 tons of dewatered sludge/day

Effluent flow rate 541 gpm a

Frequency of effluent discharge Continuous during sampling episode c

Retention time of desaturation tanks 1.9 hours d

Retention time of primary clarifier 12.8 hours d

Retention time of equalization tank 14.8 hours d

Retention time of ferric chloride mix tank 0.34 hours d

Retention time of second ary clarifier 4.7 hours d

Retention time of entire FG D wastewater treatment
system 34.5 hours d

Note: Mitchell began discharging continuously to FGD WWT at 1600 on 10/12/07. Prior to that time, they had been sending blowdown to treatment approximately 1x/day for 5-6 hours. Typically, the plant transfers approximately 400 gpm of scrubber purge to the FGD WWT; however, the average flows on 10/16 and 10/17 were 538 gpm and 502 gpm, respectively. a – 502 gpm is the average of 96 flow rate measurements of the influent to the two desaturation tanks taken every 15 minutes on 10/17/07; however, the plant typically transfers the scrubber purge to the wastewater treatment system at 400 gpm. The effluent flow rate (541 gpm) is the average of 96 flow rate measurements of the effluent from the wastewater treatment system taken every 15 minutes on 10/17/07. The effluent fl ow rate is greater than the scrubber purge flow rate because of the chemical addition (e.g., lime) added to the FGD wastewater treatment system.

b – Actual TSS: 0.6% on 10/17. c – Typically the plant only discharges 5 to 6 hours/day; however, during the sampling episode, the plant was discharging continuously over the two day period. d – Based on 400 gpm flow rate.

### 3-22Table 3-10. Ash System Operating Characteristics During Sample Collection, MitchellUnitIDFly AshGeneration(tph)aFly AshSluice WaterFlow Rate(gph)bSource of FlyAsh SluiceWaterSluice CycleDuration andFrequencyContinuousSluicing(Yes/No)BottomAshGeneration(tph)aBottom AshSluiceWater FlowRate (gph)bSource ofBottom AshSluice WaterSluice CycleDurationandFrequencyContinuousSluicing(Yes/No)1 21.9 126,000 Cooling towerblowdown andriver watermake-upContinuous Yes 5.5 39,000 Bottom ashpond overflow(includingFGD WWT) &River watermakeup2x/day No2 21.9 126,000 Cooling towerblowdown andriver watermake-upContinuous Yes 5.5 39,000 Bottom ashpond overflow(includingFGD WWT) &River watermakeup2x/day Noa – Ash generation was estimated based on the assumption that ashis 12% of the mass of the total coal burned per unit. Fly ashis assumed to be 80% of thisamount and bottom ash is assumed to be 20 percent. Amount of coal was estimated based on 4 million tons of coal per year assuming a 50% split between bothunits. These numbers are not based on the coal usage during the sampling episode.b – Flows are assumed to be split 50% between both units based ontypical flow rates on the Water Balance Diagram. These numbers are not based on flowmeasurements collected during the sampling episode.

### 3-23 Table 3-11. Fly Ash Pond System Opera ting Characteristics, Mitchell

Ash Sluice Information

Total influent flow rate 10 MGD a

Mitchell fly ash 6.05 MGD a

Kammer fly ash 1.4 MGD a

AMD treatment 0.4 MGD a

Coal preparation wastewater 2.28 MGD a

Stormwater Varies

Rainfall Varies

Influent Duration Continuous

Fly Ash Pond Information

pH control system N/A

Chemicals added to pond system N/A

Drainage area routed to pond system 1046 acres

Pond size 63.5 acres

Pond size 376,000,000 gallons

Pond retention time 38 days (nominal)

Frequency of pond dredging N/A

Sections of pond 2 sections separated by boom

Final discharge structure type Concrete settling basin followed by Cipolletti weir

Effluent flow rate 7.8 MGD b

Frequency of effluent discharge Continuous

a – Typical flow rates for the fly ash pond system, as shown on the plants’ water flow diagram. These flow rates were not measured during the sampling episode.

b – The effluent flow rate is based on three measurements from the flow meter measured during sample collection. These three measurements were taken randomly at differing frequencies. N/A – Not applicable.

### 4-1 4. L ABORATORY 

### A NALYTICAL 

### R ESULTS AND 

### D ISCUSSION



### This section summarizes and di scusses the analytical data co llected during this sampling episode. Section 4.1 discusses the methods used by the laboratories for th e biphasic analysis of SP-1 and presents the results of the analyses. Sec tion 4.2 presents the labora tory analytical data

for the influent to and effluent from the FGD wastewater treatment system and the FGD primary clarifier effluent within the system. Section 4.3 presents the laboratory an alytical data for the effluent from the fly ash pond.

Appendix A provides all analytical results for all samples collected at Mitchell, including all qualified results and all results that were measured above the method detection limit, but below the reporting limit (i.e., J-valu es). Appendix B presents the an alytical results in a format similar to that used for Sections 4.2 and 4.3, but with the J-values shown (J-values are not included in the tables presen ted in Sections 4.2 and 4.3).

4.1 Measured and Calculated Results for FGD Influent Samples

The samples of the influent to the FGD wast ewater treatment system were expected to contain significant amounts of r eadily settleable solids, to a large degree consisting of gypsum, unreacted limestone, and fly ash. Because of th is, EPA was concerned that there could be analytical interferences for the metals analyses, since the acid digestion procedures used may not be sufficiently rigorous for samples with high solid s loads. Therefore, EPA directed its contract laboratories to separate the aque ous and solid phases of the samp le prior to conducting certain analyses, where allowed by the analytical method and if necessary to obtain acceptable analytical results. This biphasic approach provides EPA with measured or calculated pollutant

concentrations for the follo wing phases of the sample:

• 

### Aqueous phase;

• 

### Solid phase; and

• 

### Total sample.

The routine metals laboratory, ProChem Analytic al (ProChem), and the low-level laboratory, Battelle Marine Sciences Laboratory (Battelle), used two different appr oaches for the biphasic analysis because of the different methods used fo r routine versus low-level metals analyses. This section describes the approaches used by each labor atory and presents the results of the analyses.

Routine Metals and Classicals Analyses

ProChem used EPA Method 200.7 to analyze th e wastewater samples for routine metals, and EPA Method 245.1 to analyze for routine mercury. EPA Method 200.7 states, “Aqueous samples containing total suspended solids ≥ 1% (w/v) should be extracted as a solid type sample.” [3] Because EPA expected the solids cont ent to be greater than one percent, ProChem developed an approach for the analysis of the FGD influent samples that consisted of filtering the solids from the sample and analyzing the soli d and aqueous phases separately. However, upon receipt of the FGD influent samples, ProChem de termined that the solids content of the samples was less than 1 percent; theref ore, ProChem did not perform the phase separation prior to analyzing the samples. Instead, ProChem analyzed the total sample directly from the sample

bottle.

### 4-2 Low-Level Metals Analyses

Battelle used EPA Method 1638 to analyze the wastewater samples for low-level metals, and EPA Method 1631E to analyze for low-le vel mercury. EPA Method 1638 does not contain any language stating how wastewater samples with high solid concentrations should be analyzed; therefore, Battelle developed an approach for th e analysis of the FGD influent samples that minimized potential contamination to the samples. Battelle’s approach consisted of analyzing the

total metals concentration and dissolved metals concentration for each analyte directly from the sample bottles, and calculating the solid phase concentration. By usi ng this approach, the laboratory did not have to perfor m an extra filtration step to determine the individual metals concentrations for the various phases in the samp le. Battelle did not have any problems with the digestion of the solids during the total sample an alyses for the Mitchell FGD influent samples.

To calculate the solid phase concentration from the total and dissolved phase results,

Battelle also measured the TSS level in the to tal metals sample bottle. EPA used the following equation to calculate the individual metal solid phase concentrations for the sample:

TSS Diss Total

Solid 

### C C

- C C = 

### (4-2)

where:

C Solid 

### = concentration of the metal in the solid phase of the sample;

C Total 

### = total concentration of the metal in the sample;

C Diss 

### = concentration of the metal in th e dissolved phase of the sample; and

C TSS 

### = TSS concentration of the sample.

Table 4-1 presents the results of the biphasi c analysis for low-level total metals. Only those analytes that were detect ed at the influent to the FGD wastewater treatment system (at levels above the reporting limit) ar e included in the table. Results are rounded to three significant figures. Appendix Table A-1 presen ts all the analytical results from the influent to the FGD wastewater treatment system sample analysis, including results that were measured above the method detection limit, but below the reporting limit (i.e., J-values).

4.2 FGD Wastewater Treatment System

Table 4-2 presents the analytical results of the classical pollutants in the influent to the FGD wastewater treatment system (SP-1), the F GD primary clarifier effluent (SP-2), and the

effluent from the FGD wa stewater treatment system (average of SP-3 and SP-5 results). Table 4- 3 presents the analytical results of the routine and low-level metals for these same sampling points. Only those analytes that were detected in one or more samples (at levels above the reporting limit) for the sampling episode are include d in the table. Result s are rounded to three significant digits. If an analyt e was measured above the method detection limit, but below the report limit, “NQ” is reported followed by the samp le-specific report limit in parentheses. If an analyte was not detected in a sample above the method detection limit, “ND” is reported followed by the sample-specific report limit in parentheses. Note that the results presented in Tables 4-2 and 4-3 are not paired results, mean ing that sample collection across the treatment system was not timed to reflect the amount of time it takes the wastewater to pass through the treatment system (approximately 34.5 hours).

### 4-3 Appendix Tables A-1, A-2, A-3, and A-4 pres ent all the analytical results from the influent to the FGD wastewater treatment syst em (SP-1), the FGD primary clarifier effluent (SP-2), the effluent from the F GD wastewater treatment system (SP-3), and the duplicate of the

effluent from the FGD wa stewater treatment system (SP-5) sa mple analyses, including J-values. Appendix Table B-1 presents the an alytical results for the metal an alytes in a format similar to Table 4-3; however, Table B-1 also includes re sults where analytes were measured above the method detection level, but below th e reporting limit (i.e., J-values).

4.3 Fly Ash Pond

Table 4-4 presents the analytical results of th e classical pollutants in the effluent from the fly ash pond (SP-4). Table 4-5 presents the analytic al results of the routin e and low-level metals in the effluent from the fly ash pond (SP-4). Only those analytes that were detected in one or more samples (at levels above the reporting limit) for the sampling episod e are included in the

table. Results are rounded to three significant digits. If an analyte was measured above the method detection limit, but below the report limi t, “NQ” is reported followed by the samplespecific report limit in parenthe ses. If an analyte was not detect ed in a sample above the method detection limit, “ND” is reported followed by th e sample-specific report limit in parentheses. Appendix Table A-5 presents all th e analytical results for the e ffluent from the fly ash pond (SP4) sample analysis, including J- values. Appendix Table B-2 presents the analytical results for the metal analytes in a format similar to Table 4-5; however, Table B-2 also includes results where analytes were measured above the method detect ion level, but below the reporting limit (i.e., Jvalues).

### 4-4 Table 4-1. Biphasic Sample Results for Lo w-Level Total Metals Measured Above the Report Limit, FGD Influent, Mitchell

Analyte Dissolved Sample Result (ug/L) Calculated Solid Phase Result (mg/kg) Total Sample Result (ug/L)

Low-level Total Metals

Antimony 1.97 1.02 9.23

Arsenic 20.2 5.55 59.9

Cadmium NQ (1.00) NQ (0.699) 5.28

Chromium ND (80.0) 24.6 176 L

Copper NQ (20.0) 19.0 139

Lead ND (0.500) 9.52 68.1

Mercury 0.0111 19.3 138

Nickel 433 30.3 650

Selenium 443 216 1,990

Thallium 4.47 0.260 6.33

Zinc 160 79.7 730

L – Sample result between 5x and 10x blank result. ND – Not detected (number in parenthesis is the report limit). NQ – Analyte was measured above the method detection limit, but below the report limit (number in parenthesis is the report limit). The analytical result is presented in Appendix A with a J flag designation.

### 4-5Table 4-2. Classical Pollutants Measured Above the ReportLimit for the FGD Wastewater Treatment System, MitchellAnalyteMethodUnitFGD Influent (SP-1)FGD Primary ClarifierEffluent (SP-2)FGD Effluent(SP-3/SP-5)aClassical PollutantsAmmonia As Nitrogen (NH3-N) 4500-NH3F MG/L 1.89 2.68 3.49Nitrate/Nitrite (NO3-N + NO2-N) 4500NO3H MG/L 20.6 23.0 25.4Total Kjeldahl Nitrogen (TKN) 4500-N,C MG/L 13.3 10.4 9.74Biochemical Oxygen Demand (BOD) SM 5210B MG/L 21.0 30.0 <7.50Chloride 4500-CL-C MG/L 7,200 7,000 6,700Hexane Extractable Material (HEM) 1664A MG/L 11.0 9.00 5.00Sulfate D516-90 MG/L 1,640 1,880 1,770Total Dissolved Solids (TDS) 2540 C MG/L 18,100 19,400 17,700Total Phosphorus 365.3 MG/L 3.57 0.120 0.0745Total Suspended Solids (TSS) 2540 D MG/L 7,320 192 17.5a – The FGD effluent results represent the average of the FGD effluent and the duplicate of the FGD effluent analytical measurements.< – Average result includes atleast one non-detect value. (Calculation usesdetection limit for non-detected results).Note: Results shown are not paired samples. See Section 4.2.

### 4-6a – The FGD effluent results represent the average of the FGD effluent and the duplicate of the FGD effluent analytical measurements.< – Average result includes atleast one non-detect value. (Calculation usesdetection limit for non-detected results).L – Sample result between 5x and 10x blank result.R – MS/MSD % Recovery outside method acceptance criteria.T – MS/MSD RPD outside method acceptance criteria.NA – Not Analyzed.ND – Not detected (number in parenthesis is the report limit).NQ – Analyte was measured above the method detection limit, but below the report limit (number in parenthesis is the report limit). The analytical result ispresented in Appendix A with a J flag designation. A “NQ” forthe average FGD effluent indicatesthat the original FGD effluentand/or the duplicate of the FGDeffluent is a J-value. The analytical result for the original FGD effluent and/or the duplicate ofthe FGD effluent is presented in Appendix A with a J flagdesignation.Note: Results shown are not paired samples. See Section 4.2.Table 4-3. Metals Measured Above the Report Limitfor the FGD Wastewater Treatment System, MitchellFGD Influent(SP-1)FGD Primary Clarifier Effluent(SP-2)FGD Effluent(SP-3/SP-5)aAnalyteMethodUnitTotalDissolvedTotalDissolvedTotalDissolvedRoutine MetalsAluminum 200.7 UG/L 17,900 ND (50.0) ND (50.0) ND (50.0) ND (50.0) ND (50.0)Antimony 200.7 UG/L 28.7 NQ (20.0) NQ (20.0) NQ (20.0) NQ (20.0) NQ (20.0)Arsenic 200.7 UG/L 72.5 NQ (10.0) 10.0 NQ (10.0) <10.3 NQ (10.0)Barium 200.7 UG/L 588 488 457 401 433 389Beryllium 200.7 UG/L 8.04 6.02 NQ (5.00) NQ (5.00) NQ (5.00) NQ (5.00)Boron 200.7 UG/L 229,000 232,000 244,000 217,000 208,000 199,000Cadmium 200.7 UG/L 19.7 NQ (5.00) NQ (5.00) NQ (5.00) NQ (5.00) NQ (5.00)Calcium 200.7 UG/L 3,030,000 2,350,000 2,650,000 2,450,000 2,380,000 2,270,000Chromium 200.7 UG/L 70.7 ND (10.0) NQ (10.0) ND (10.0) ND (10.0) ND (10.0)HexavalentChromiumD1687-92UG/L NA 5.00 NA 15.0 NA 11.0Cobalt 200.7 UG/L 68.0 NQ (50.0) NQ (50.0) NQ (50.0) NQ (50.0) NQ (50.0)Copper 200.7 UG/L 164 NQ (10.0) 16.6 12.0 16.2 14.1Iron 200.7 UG/L 60,600 ND (100) 971 NQ (100) 318 NQ (100)Lead 200.7 UG/L 103 ND (50.0) NQ (50.0) ND (50.0) NQ (50.0) ND (50.0)Magnesium 200.7 UG/L 1,470,000 1,370,000 1,480,000 1,300,000 1,280,000 1,220,000Manganese 200.7 UG/L 28,800 27,900 7,380 7,000 4,440 4,120

### 4-7a – The FGD effluent results represent the average of the FGD effluent and the duplicate of the FGD effluent analytical measurements.< – Average result includes atleast one non-detect value. (Calculation usesdetection limit for non-detected results).L – Sample result between 5x and 10x blank result.R – MS/MSD % Recovery outside method acceptance criteria.T – MS/MSD RPD outside method acceptance criteria.NA – Not Analyzed.ND – Not detected (number in parenthesis is the report limit).NQ – Analyte was measured above the method detection limit, but below the report limit (number in parenthesis is the report limit). The analytical result ispresented in Appendix A with a J flag designation. A “NQ” forthe average FGD effluent indicatesthat the original FGD effluentand/or the duplicate of the FGDeffluent is a J-value. The analytical result for the original FGD effluent and/or the duplicate ofthe FGD effluent is presented in Appendix A with a J flagdesignation.Note: Results shown are not paired samples. See Section 4.2.Table 4-3. Metals Measured Above the Report Limitfor the FGD Wastewater Treatment System, MitchellFGD Influent(SP-1)FGD Primary Clarifier Effluent(SP-2)FGD Effluent(SP-3/SP-5)aAnalyteMethodUnitTotalDissolvedTotalDissolvedTotalDissolvedMercury 245.1 UG/L 67.5 ND (10.0) ND (10.0) ND (10.0) ND (10.0) ND (10.0)Molybdenum 200.7 UG/L 65.0 22.2 24.5 21.9 22.9 21.4Nickel 200.7 UG/L 554 355 55.5 NQ (50.0) NQ (50.0) NQ (50.0)Selenium 200.7 UG/L 2,130 46.9 121 82.3 83.6 R 71.7Sodium 200.7 UG/L 314,000 324,000 315,000 305,000 305,000 300,000Thallium 200.7 UG/L ND (10.0) ND (10.0) ND (10.0) ND (10.0) ND (10.0) ND (10.0)Titanium 200.7 UG/L 377 ND (10.0) 10.5 ND (10.0) <10.1 ND (10.0)Vanadium 200.7 UG/L 203 ND (20.0) NQ (20.0) ND (20.0) ND (20.0) ND (20.0)Yttrium 200.7 UG/L 64.9 NQ (5.00) NQ (5.00) NQ (5.00) NQ (5.00) NQ (5.00)Zinc 200.7 UG/L 885 87.8 46.4 ND (10.0) 25.4 ND (10.0)Low-Level MetalsAntimony 1638 UG/L 9.23 1.97 2.00 1.75 <1.37 1.64Arsenic 1638 UG/L 59.9 20.2 NQ (15.0) 20.9 <25.2 20.9 TCadmium 1638 UG/L 5.28 NQ (1.00) NQ (1.00) NQ (1.00) NQ (3.00) NQ (1.00)Chromium 1638 UG/L 176 L ND (80.0) NQ (80.0) NQ (80.0) NQ (120) NQ (80.0)HexavalentChromium1636 UG/L NA NA NA NQ (2.50) NA NQ (2.50)Copper 1638 UG/L 139 NQ (20.0) NQ (20.0) NQ (20.0) NQ (30.0) NQ (20.0)

### 4-8a – The FGD effluent results represent the average of the FGD effluent and the duplicate of the FGD effluent analytical measurements.< – Average result includes atleast one non-detect value. (Calculation usesdetection limit for non-detected results).L – Sample result between 5x and 10x blank result.R – MS/MSD % Recovery outside method acceptance criteria.T – MS/MSD RPD outside method acceptance criteria.NA – Not Analyzed.ND – Not detected (number in parenthesis is the report limit).NQ – Analyte was measured above the method detection limit, but below the report limit (number in parenthesis is the report limit). The analytical result ispresented in Appendix A with a J flag designation. A “NQ” forthe average FGD effluent indicatesthat the original FGD effluentand/or the duplicate of the FGDeffluent is a J-value. The analytical result for the original FGD effluent and/or the duplicate ofthe FGD effluent is presented in Appendix A with a J flagdesignation.Note: Results shown are not paired samples. See Section 4.2.Table 4-3. Metals Measured Above the Report Limitfor the FGD Wastewater Treatment System, MitchellFGD Influent(SP-1)FGD Primary Clarifier Effluent(SP-2)FGD Effluent(SP-3/SP-5)aAnalyteMethodUnitTotalDissolvedTotalDissolvedTotalDissolvedLead 1638 UG/L 68.1 ND (0.500) 2.01 NQ (0.500) NQ (1.50) NQ (0.500)Mercury 1631E UG/L 138 0.0111 2.38 0.0190 0.788 0.159Nickel 1638 UG/L 650 433 NQ (100) 123 <155 102Selenium 1638 UG/L 1,990 443 234 472 431 T 407Thallium 1638 UG/L 6.33 4.47 4.08 4.11 3.96 3.99Zinc 1638 UG/L 730 160 71.0 NQ (50.0) <83.5 NQ (50.0)

### 4-9 Table 4-4. Classical Pollutants Measured Ab ove the Report Limit for the Fly Ash Pond Effluent, Mitchell

Analyte Method Unit Fly Ash Pond Effluent (SP-4)

Classical Pollutants

Ammonia As Nitrogen (NH 3 -N) 4500-NH3F MG/L 0.150

Nitrate/Nitrite (NO 3 -N + NO 2 -N) 4500NO3H MG/L 0.730

Total Kjeldahl Nitrogen (TKN ) 4500-N,C MG/L ND (0.100)

Biochemical Oxygen Demand (BOD) SM 5210B MG/L 2.00

Chloride 4500-CL-C MG/L 240

Hexane Extractable Material (HEM) 1664A MG/L ND (5.00)

Sulfate D516-90 MG/L 1,110

Total Dissolved Solids (TDS) 2540 C MG/L 2,050

Total Phosphorus 365.3 MG/L 0.200

Total Suspended Solids (TSS) 2540 D MG/L 15.0

ND – Not detected (number in parenthesis is the report limit).NA – Not analyzed. ND – Not detected (number in parenthesis is the report limit). NQ – Analyte was measured above the method detection limit, but below the report limit (number in parenthesis is the report limit). The analytical result is presented in Appendix A with a J flag designation.



### 4-10 Table 4-5. Metals Measured Above the Report Limit for the Fly Ash Pond Effluent,

Mitchell

Fly Ash Pond Effluent (SP-4) Analyte Method Unit Total Dissolved

Routine Metals

Aluminum 200.7 UG/L 404 241

Antimony 200.7 UG/L 24.6 23.9

Arsenic 200.7 UG/L 150 138

Barium 200.7 UG/L 133 128

Beryllium 200.7 UG/L ND (5.00) ND (5.00)

Boron 200.7 UG/L 2,350 2,290

Cadmium 200.7 UG/L ND (5.00) ND (5.00)

Calcium 200.7 UG/L 115,000 113,000

Chromium 200.7 UG/L 15.9 14.1

Hexavalent Chromium D1687-92 UG/L NA 7.00

Cobalt 200.7 UG/L NQ (50.0) NQ (50.0)

Copper 200.7 UG/L NQ (10.0) NQ (10.0)

Iron 200.7 UG/L NQ (100) ND (100)

Lead 200.7 UG/L ND (50.0) ND (50.0)

Magnesium 200.7 UG/L 21,000 20,300

Manganese 200.7 UG/L NQ (15.0) NQ (15.0)

Mercury 245.1 UG/L ND (0.200) ND (0.200)

Molybdenum 200.7 UG/L 359 330

Nickel 200.7 UG/L NQ (50.0) NQ (50.0)

Selenium 200.7 UG/L 177 162

Sodium 200.7 UG/L 526,000 514,000

Thallium 200.7 UG/L ND (10.0) ND (10.0)

Titanium 200.7 UG/L NQ (10.0) ND (10.0)

Vanadium 200.7 UG/L 110 108

Yttrium 200.7 UG/L ND (5.00) ND (5.00)

Zinc 200.7 UG/L ND (10.0) ND (10.0)

Low-Level Metals

Antimony 1638 UG/L 25.8 22.5

Arsenic 1638 UG/L 142 131

Cadmium 1638 UG/L 1.32 1.17

Chromium 1638 UG/L 20.4 16.0

Hexavalent Chromium 1636 UG/L NA 17.4

Copper 1638 UG/L 5.47 4.54

Lead 1638 UG/L 0.580 NQ (0.250)

Mercury 1631E UG/L 0.00212 NQ (0.000500)NA – Not analyzed. ND – Not detected (number in parenthesis is the report limit). NQ – Analyte was measured above the method detection limit, but below the report limit (number in parenthesis is the report limit). The analytical result is presented in Appendix A with a J flag designation.



### 4-11 Table 4-5. Metals Measured Above the Report Limit for the Fly Ash Pond Effluent,

Mitchell

Fly Ash Pond Effluent (SP-4) Analyte Method Unit Total Dissolved

Nickel 1638 UG/L 11.0 9.57

Selenium 1638 UG/L 191 161

Thallium 1638 UG/L 1.72 1.42

Zinc 1638 UG/L 10.1 9.51

### 5-1 5. D ATA 

### Q UALITY



### QA/QC procedures applicab le to the Mitchell sampling episode are outlined in the Quality Assurance Project Plan for the Steam Electric Detailed Study (QAPP) [2]. This section describes the QC procedures used to assess th e precision and accuracy of the analytical data presented in Section 4 and Appendices A and B. QC practices used for this sampling episode include the analysis of matrix spikes, blanks , duplicate samples, and QC standard checks.

5.1 Analytical Quality Control

EPA contracted directly with analytical labor atories for the analysis of samples collected during this episode. EPA’s Sample Control Center (SCC) verified that the performances of the laboratories selected by EPA wa s acceptable by conducting QC checks of the analytical data as specified by the SCC’s Quality Assurance Project Plan dated 15 February 2008. SCC data review chemists prepared written data review narratives describing any qualifications of the analytical data from this episode. The data review narratives are included in Appendix C.

5.2 Field Quality Control

This section discusses the bottle blanks, equipment bla nks, field blanks, and field duplicate sample results. Section 3.8 of the Sa mpling Plan discusses field QC specifications. Tables presented in this section include results for only certain analytes (e.g., only those detected in the respective field QC sample or those de tected during the sampling episode). Appendix A contains the results for all analyt es, both detected and nondetected.

5.2.1 Bottle Blanks

EPA collects bottle blanks to evaluate possi ble contamination from the sample collection bottles. Bottle blanks were collected and analyzedfor low-level metals by the supplier of the precleaned bottles, Albion Environmental.

Albion Environmental collected the bottle blanks for the low-level metals and low-level hexavalent chromium samples bottles (250 mL LDPE), the speciation sample bottles (125 mL amber glass bottles), and the 2-L blank water bottles by filling the pre-cleaned bottle to the neck with ASTM Type 1 water, preserving the sample with nitric acid to a pH <2, and allowing the sample to sit for at least 24 hours. Albion Envi ronmental then analyzed the samples using EPA

Method 1638.

Albion Environmental collected the bottle blan ks for the 4-liter blank water bottles by filling the pre-cleaned bottle with ASTM Type 1 water and allowing it to soak for approximately 24 hours. Albion Environmental then poured a repr esentative aliquot into a pre-cleaned LDPE sample bottle, preserved the sample with nitric ac id to a pH <2, and allowed the sample to sit for

at least 24 hours. Albion E nvironmental then analyzed th e samples using EPA Method 1638.

Albion Environmental collected the bottle blanks for the low-level mercury sample bottles (250 flint glass bottles a nd 1-L borosilicate glass bottles) by filling the pre-cleaned bottle to the neck with ASTM Type 1 water, preservi ng the sample with bromine monochloride, and

### 5-2 allowing the sample to sit for at least 24 hours. Albion Environmental then analyzed the samples using EPA Method 1631E.

Albion Environmental collected the bottle bl ank for the 10-liter composite containers by filling the container with approximately two liters of ASTM Type 1 water and allowing it to soak for approximately 24 hours. During this pe riod, Albion Environmental shook the container periodically and changed its orientation to e xpose all surfaces of the container to the ASTM Type 1 water. Albion Environmental then shook the 10-liter container and poured a representative sample into a pre-cleaned sample bottle (a LDPE bottle for low-level metals and a glass bottle for low-level mercury). The blank samples were then preserved and analyzed according to the analytical methods (i.e., EP A Method 1638 or 1631E), as described above for the other bottle blank samples.

No metals were detected in the bottle bla nks, indicating that ther e was no contamination from the sample containers. Appendix Table A-6 pr esents all of the analy tical results from the bottle blank and equipment blank analyses for al l of the equipment used for the collection of low-level samples.

5.2.2 Equipment Blanks

EPA collects equipment blanks to evaluate possible contamination from the equipment used for sample collection. EPA did not collect specific equipment blanks for this sampling program; however, the field blanks as collected (as described in Section 5.2.3) include the sampling equipment. In addition, Albion Enviro nmental collected and analyzed equipment blanks for low-level metals for each type of pre-cleaned equipment supplied for the episode.

Albion Environmental collected the equipm ent blanks for the capsule filters and fabricated tubing sets by pumping approximate ly 500 mL of ASTM T ype 1 water through the pre-cleaned filter or tubing set and discarding th e water. Albion Environmental then pumped additional water through the pre-cl eaned filter or tubing set into a pre-cleaned bottle (a LDPE bottle for low-level metals and a glass bottle fo r low-level mercury). The blank samples were then preserved and analyzed according to the analytical methods (EPA Method 1638 or 1631E),

as described in Section 5.2.1 for the bottle blank samples. For the fabricated tubing sets, Albion Environmental collected and analyzed equipmen t blanks for the individual components of the tubing sets, the assembled tubing sets, or both.

During the analysis of the equipment blanks , Albion Environmental detected barium at 0.490 ug/L and 0.476 ug/L in 2 of the 14 pieces of #73 silicone tubing that were analyzed from the various cleaning batches used to assemble th e tubing sets. Barium was not detected above the report limit in the equipment blanks for the ot her 12 analyses. In addition, barium was not detected in any of the field blank samples (a bove the report limit), as described in Section 5.2.3. Finally, barium was measured at a concentra tion greater than 250 times the equipment blank result at all of the sampling points for both th e total and dissolved phases. Therefore, the potential contamination from the sampling equi pment did not significantly affect the sampling

results.

No other metals were detected in the equi pment blanks, indicating that there was no other contamination from the sampling equipment. Appe ndix Table A-6 presents all of the analytical

### 5-3 results from the bottle blank and equipment blank analyses for all of the equipment used for the collection of low-level samples. EPA assumed th e barium equipment blank concentration to be 0.490 ug/L for all tubing sets containing #73 silic one tubing because the tubing set may have been fabricated using #73 silicone from the cleani ng batch that had a detec tion for barium at that

concentration.

5.2.3 Field Blanks

The sampling team collected field blanks (SP-6, SP-7, SP-8, and SP-9) to evaluate possible contamination from sampling equipm ent, sampling equipment decontamination procedures, sample collection procedures, or at mospheric contamination. EPA analyzed the field blank samples for the low-level and routine meta ls analyses, including both total and dissolved

metals 1



### .

The low-level and routine total metals field blank samples for the influent to the FGD wastewater treatment system (SP- 6), FGD primary clarifier effluent (SP-7), and effluent from the FGD wastewater treatment syst em (SP-8) were collected by pouring ASTM Type 1 water through a precleaned funnel attached to the silicone tubing used for sample collection. The sampling team shrouded the blank water and funn el with a plastic bag while pouring the blank water into the funnel to preven t potential atmospheric depositi on. In addition, the sample bottles were placed in a “cleanbox” to prevent potential atmospheri c deposition. The ASTM Type 1 water flowed through the funnel, tubing, and “Y ” splitter, and was poured into the sample bottles. EPA collected the field blank samples as “true” split samples with Mitchell’s representative, using the same procedure discusse d in the sample collect ion description (Section 3.1).

The low-level and routine total metals field blank samples for the effluent from the fly ash pond (SP-9) were collected by pumping ASTM Type 1 water through the tubing used for the sample collection. The container holding the ASTM Type 1 water was placed in a large plastic bag and the tubing was placed directly into the cont ainer. The large plastic bag was closed off as quickly as possible to minimize potential atmo spheric deposition. The sample bottles were placed in a “cleanbox” and the ASTM Type 1 water was pumped through the tubing and “Y” splitter, and poured into the samp le bottles. EPA collected the fiel d blank samples as “true” split samples with Mitchell’s representative, using the same procedure discussed in the sample collection description (Section 3.1).

The low-level and routine dissolved metals field blank samples for the influent to the FGD wastewater treatment system (SP-6), the FGD primary clarifier effluent (SP-7), the effluent from the FGD wastewater treatment system (SP-8) , and the effluent from the fly ash pond (SP-9) were collected by pumping ASTM Type 1 water th rough the tubing used for the dissolved metals sample collection and a capsule filter. The cont ainer holding the ASTM Ty pe 1 water was placed in a large plastic bag and the tu bing was placed directly into the container. The large plastic bag was closed off as quickly as possible to mini mize potential atmospheric deposition. The sample

1 EPA did not collect a low-level dissolved mercury field blan k sample in the field because the sample filtration was performed at the laboratory to minimize potential mercury contamination. The laboratory performed a filtration blank prior to filtering the sample, which is assessed as th e field blank for the low-level dissolved mercury sample. Mercury was not detected above the method detection lim it (0.000188 ug/L) in the f iltration blank performed for both the first and second day of samples, which includes all associated sampling points.

### 5-4 bottles were placed in a “cleanbox” and the ASTM Type 1 water was pumped through the tubing, capsule filter, and “Y” sp litter, and poured into the samp le bottles. EPA collected the field blank samples as “true” sp lit samples with Mitchell’s re presentative, using the same procedure discussed in the sample collection description (Section 3.1).

Table 5-1 presents the fiel d blank analytical results fo r SP-6 through SP-9. Only those analytes that were detected in the field bla nk samples at levels above the reporting limit are

included in the table. Results are rounded to th ree significant digits. Appendix Tables A-7, A-8, A-9, and A-10 present all the analytical results for the field blanks from th e influent to the FGD wastewater treatment system (SP- 6), FGD primary clarifier effluent (SP-7), the effluent from the FGD wastewater treatment system (SP-8), and the effluent from the fly ash pond (SP-9) sample analyses, including all qualified results and all results that were measured above the method detection limit, but below the reporting limit (i.e., J-values).

5.2.4 Field Duplicates

The sampling team collected field duplicat e samples to assess the sampling measurement precision for the episode. Field dupl icate samples are separate samp les collected from the same location as the original sample. The duplicate is filled immediately after the original sample, and is stored and analyzed independently. The re lative percent difference (RPD) between the two sample results is examined to determine the precision of the data. EPA used the following equation to calculate the RPD for the duplicate sample results.

100

2 D S D S (%) RPD × ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + −

= 

### (5-1)

where: S = concentration of the analyte from original sample analysis; D = concentration of the analyte from the duplicate sample analysis; and RPD = relative percent difference between the original and duplicate sample

result.

During this sampling episode, duplicate sa mples (SP-5) for all analytes (except HEM/SGT-HEM) were collected from the effluent from the FGD wastewater treatment system (SP-3). Table 5-2 presents an alytical results and the RPD for SP-3 and SP-5 and includes analytical results for only those analytes that were detected in one or more samples for the sampling episode. Results are rounded to three si gnificant digits. Appendix Tables A-3 and A-4 present all the analytical results for the efflue nt from the FGD wastewater treatment system (SP-3) and the duplicate of the effluent from the FGD wastewater trea tment system (SP-5) sample analyses, including all qualified results an d all results that were measured above the method detection limit, but below th e reporting limit (i.e., J-values).

### 5-5 Table 5-1. Field Blank Results Measured Above the Report Limit, Mitchell

Analyte Sample Point Method Unit Concentration (ug/L)

Routine Total Metals

Calcium FGD Effluent 200.7 UG/L 235

Calcium Fly Ash Pond Effluent 200.7 UG/L 113 L

Routine Dissolved Metals

Boron FGD Effluent 200.7 UG/L 140

Magnesium FGD Effluent 200.7 UG/L 807

Low-Level Dissolved Metals

Hexavalent Chromium FGD Primary Clarifier 1636 UG/L 2.97

L – Sample result between 5x and 10x blank result.

### 5-6< – Average result includes atleast one non-detect value. (Calculation usesdetection limit for non-detected results).R – MS/MSD % Recovery outside method acceptance criteria.T – MS/MSD RPD outside method acceptance criteria.NA – Not analyzed.NC – Not calculated.ND – Not detected (number in parenthesis is the report limit).NQ – Analyte was measured above the method detection limit, but below the report limit (number in parenthesis is the report limit). The analytical result ispresented in Appendix A with a J flag designation.Table 5-2. Field Duplicate Results, MitchellAnalyteOriginal FGD EffluentConcentration (SP-3)Duplicate FGD EffluentConcentration (SP-5)Average ResultRelative PercentDifference (%)UnitsClassical PollutantsAmmonia As Nitrogen (NH3-N) 3.26 3.71 3.49 13 MG/LNitrate/Nitrite (NO3-N + NO2-N) 25.4 25.3 25.4 0.39 MG/LTotal Kjeldahl Nitrogen (TKN) 9.37 10.1 9.74 7.5 MG/LBiochemical Oxygen Demand(BOD)ND (2.00) 13.0 < 7.50 NC MG/LChloride 6,500 6,900 6,700 6.0 MG/LHexane Extractable Material(HEM)5.00 NA 5.00 NC MG/LSulfate 1,760 1,770 1,770 0.57 MG/LTotal Dissolved Solids (TDS) 17,400 17,900 17,700 2.8 MG/LTotal Phosphorus 0.0700 0.0790 0.0745 12 MG/LTotal Suspended Solids (TSS) 20.0 15.0 17.5 29 MG/LRoutine Total MetalsAluminum ND (50.0) ND (50.0) ND (50.0) NC UG/LAntimony NQ (20.0) NQ (20.0) ND (20.0) NC UG/LArsenic 10.6 NQ (10.0) < 10.3 NC UG/LBarium 434 431 433 0.69 UG/LBeryllium NQ (5.00) NQ (5.00) ND (5.00) NC UG/LBoron 210,000 206,000 208,000 1.9 UG/LCadmium NQ (5.00) ND (5.00) ND (5.00) NC UG/LCalcium 2,390,000 2,360,000 2,380,000 1.3 UG/L

### 5-7< – Average result includes atleast one non-detect value. (Calculation usesdetection limit for non-detected results).R – MS/MSD % Recovery outside method acceptance criteria.T – MS/MSD RPD outside method acceptance criteria.NA – Not analyzed.NC – Not calculated.ND – Not detected (number in parenthesis is the report limit).NQ – Analyte was measured above the method detection limit, but below the report limit (number in parenthesis is the report limit). The analytical result ispresented in Appendix A with a J flag designation.Table 5-2. Field Duplicate Results, MitchellAnalyteOriginal FGD EffluentConcentration (SP-3)Duplicate FGD EffluentConcentration (SP-5)Average ResultRelative PercentDifference (%)UnitsChromium ND (10.0) ND (10.0) ND (10.0) NC UG/LCobalt NQ (50.0) NQ (50.0) ND (50.0) NC UG/LCopper 16.8 15.5 16.2 8.0 UG/LIron 331 304 318 8.5 UG/LLead NQ (50.0) NQ (50.0) ND (50.0) NC UG/LMagnesium 1,290,000 1,260,000 1,280,000 2.4 UG/LManganese 4,510 4,360 4,440 3.4 UG/LMercury ND (10.0) ND (10.0) ND (10.0) NC UG/LMolybdenum 23.3 22.4 22.9 3.9 UG/LNickel NQ (50.0) NQ (50.0) ND (50.0) NC UG/LSelenium 85.1 R 82.0 83.6 3.7 UG/LSodium 312,000 298,000 305,000 4.6 UG/LThallium ND (10.0) ND (10.0) ND (10.0) NC UG/LTitanium 10.2 NQ (10.0) < 10.1 NC UG/LVanadium ND (20.0) ND (20.0) ND (20.0) NC UG/LYttrium NQ (5.00) NQ (5.00) ND (5.00) NC UG/LZinc 15.4 35.4 25.4 79 UG/LRoutine Dissolved MetalsAluminum ND (50.0) ND (50.0) ND (50.0) NC UG/LAntimony NQ (20.0) NQ (20.0) ND (20.0) NC UG/LArsenic NQ (10.0) NQ (10.0) ND (10.0) NC UG/LBarium 390 388 389 0.51 UG/L

### 5-8< – Average result includes atleast one non-detect value. (Calculation usesdetection limit for non-detected results).R – MS/MSD % Recovery outside method acceptance criteria.T – MS/MSD RPD outside method acceptance criteria.NA – Not analyzed.NC – Not calculated.ND – Not detected (number in parenthesis is the report limit).NQ – Analyte was measured above the method detection limit, but below the report limit (number in parenthesis is the report limit). The analytical result ispresented in Appendix A with a J flag designation.Table 5-2. Field Duplicate Results, MitchellAnalyteOriginal FGD EffluentConcentration (SP-3)Duplicate FGD EffluentConcentration (SP-5)Average ResultRelative PercentDifference (%)UnitsBeryllium NQ (5.00) NQ (5.00) ND (5.00) NC UG/LBoron 198,000 200,000 199,000 1.0 UG/LCadmium NQ (5.00) NQ (5.00) ND (5.00) NC UG/LCalcium 2,250,000 2,290,000 2,270,000 1.8 UG/LChromium ND (10.0) ND (10.0) ND (10.0) NC UG/LHexavalent Chromium 10.0 12.0 11.0 18 UG/LCobalt NQ (50.0) NQ (50.0) ND (50.0) NC UG/LCopper 13.9 14.3 14.1 2.8 UG/LIron NQ (100) NQ (100) ND (100) NC UG/LLead ND (50.0) ND (50.0) ND (50.0) NC UG/LMagnesium 1,220,000 1,220,000 1,220,000 0.0 UG/LManganese 4,350 3,880 4,120 11 UG/LMercury ND (10.0) ND (10.0) ND (10.0) NC UG/LMolybdenum 21.1 21.6 21.4 2.3 UG/LNickel NQ (50.0) NQ (50.0) ND (50.0) NC UG/LSelenium 71.2 72.2 71.7 1.4 UG/LSodium 302,000 298,000 300,000 1.3 UG/LThallium ND (10.0) ND (10.0) ND (10.0) NC UG/LTitanium ND (10.0) ND (10.0) ND (10.0) NC UG/LVanadium ND (20.0) ND (20.0) ND (20.0) NC UG/LYttrium NQ (5.00) NQ (5.00) ND (5.00) NC UG/LZinc ND (10.0) ND (10.0) ND (10.0) NC UG/L

### 5-9< – Average result includes atleast one non-detect value. (Calculation usesdetection limit for non-detected results).R – MS/MSD % Recovery outside method acceptance criteria.T – MS/MSD RPD outside method acceptance criteria.NA – Not analyzed.NC – Not calculated.ND – Not detected (number in parenthesis is the report limit).NQ – Analyte was measured above the method detection limit, but below the report limit (number in parenthesis is the report limit). The analytical result ispresented in Appendix A with a J flag designation.Table 5-2. Field Duplicate Results, MitchellAnalyteOriginal FGD EffluentConcentration (SP-3)Duplicate FGD EffluentConcentration (SP-5)Average ResultRelative PercentDifference (%)UnitsLow-Level Total MetalsAntimony ND (1.00) 1.73 < 1.37 NC UG/LArsenic NQ (30.0) 20.4 < 25.2 NC UG/LCadmium NQ (5.00) NQ (1.00) ND (3.00) NC UG/LChromium NQ (160) NQ (80.0) ND (120) NC UG/LCopper NQ (40.0) NQ (20.0) ND (30.0) NC UG/LLead NQ (2.50) NQ (0.500) ND (1.50) NC UG/LMercury 0.809 0.766 0.788 5.5 UG/LNickel NQ (200) 109 < 155 NC UG/LSelenium 417 T 444 431 6.3 UG/LThallium 4.01 3.91 3.96 2.5 UG/LZinc ND (100) 67.0 < 83.5 NC UG/LLow-Level Dissolved MetalsAntimony 1.60 1.68 1.64 4.9 UG/LArsenic 19.5 T 22.3 20.9 13 UG/LCadmium NQ (1.00) NQ (1.00) ND (1.00) NC UG/LChromium NQ (80.0) NQ (80.0) ND (80.0) NC UG/LHexavalent Chromium NQ (2.50) ND (2.50) ND (2.50) NC UG/LCopper NQ (20.0) NQ (20.0) ND (20.0) NC UG/LLead NQ (0.500) NQ (0.500) ND (0.500) NC UG/LMercury 0.166 0.152 0.159 8.8 UG/LNickel 103 100 102 3.0 UG/L

### 5-10< – Average result includes atleast one non-detect value. (Calculation usesdetection limit for non-detected results).R – MS/MSD % Recovery outside method acceptance criteria.T – MS/MSD RPD outside method acceptance criteria.NA – Not analyzed.NC – Not calculated.ND – Not detected (number in parenthesis is the report limit).NQ – Analyte was measured above the method detection limit, but below the report limit (number in parenthesis is the report limit). The analytical result ispresented in Appendix A with a J flag designation.Table 5-2. Field Duplicate Results, MitchellAnalyteOriginal FGD EffluentConcentration (SP-3)Duplicate FGD EffluentConcentration (SP-5)Average ResultRelative PercentDifference (%)UnitsSelenium 413 400 407 3.2 UG/LThallium 3.96 4.01 3.99 1.3 UG/LZinc ND (50.0) NQ (50.0) ND (50.0) NC UG/L

### 6-1 6. R EFERENCES



### 1. Eastern Research Group, Inc., 2007. Sampling Plan, Ohio Power Company’s Mitchell

Plant. October 9. DCN 05912A1.

2. Eastern Research Group, Inc., 2007. Quality Assurance Project Plan for the Steam Electric Detailed Study . September 25. DCN 05079. EPA-HQ-OW-2006-0071-0724.

3. U.S. EPA. 2001. Method 200.7: Trace Elements in Water, Solids, and Biosolids, by Inductively Coupled Plasma-A tomic Emission Spectrometry . Revision 5.0. EPA-821-R01-010. January.

### Appendix A

ANALYTICAL RESULTS

### A-1J – Result measured above the MDL, but less than the reporting limit.L – Sample result between 5x and 10x blank result.U – Result below the MDL. Number shown in parentheses is the reporting limit).NA – Not applicable. Calculated value.ND – Not detected (number in parenthesis is the report limit).NP – Not provided. The sample-specific MDL and sample-specific RLare only provided for the metal analytes because EPA is presenting analytical values formetals that are quantified below the report limit. For this analyte, only values above the report limit are presented. If the analyte was not detected above the reportlimit, the report limit is presented in parentheses in the concentration column.Table A-1. FGD Influent Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationClassical Pollutants – TotalAmmonia As Nitrogen (NH3-N) 4500-NH3F MG/L 1 NP NP 1.89Nitrate/Nitrite (NO3-N + NO2-N) 4500NO3H MG/L 100 NP NP 20.6Total Kjeldahl Nitrogen (TKN) 4500-N,C MG/L 1 NP NP 13.3Biochemical Oxygen Demand (BOD) SM 5210B MG/L 4 NP NP 21.0Chloride 4500-CL-C MG/L 10 NP NP 7,200Hexane Extractable Material (HEM) 1664A MG/L 1 NP NP 11.0Silica Gel Treated HEM (SGT-HEM) 1664A MG/L 1 NP NP ND (5.00) USulfate D516-90 MG/L 50 NP NP 1,640Total Dissolved Solids (TDS) 2540 C MG/L 1 NP NP 18,100Total Phosphorus 365.3 MG/L 10 NP NP 3.57Total Suspended Solids (TSS) 2540 D MG/L 1 NP NP 7,320Routine Metals – TotalAluminum 200.7 UG/L 1 10.6 50.0 17,900Antimony 200.7 UG/L 1 0.700 20.0 28.7Arsenic 200.7 UG/L 1 0.500 10.0 72.5Barium 200.7 UG/L 1 0.100 2.00 588Beryllium 200.7 UG/L 1 0.500 5.00 8.04Boron 200.7 UG/L 100 270 10,000 229,000Cadmium 200.7 UG/L 1 0.100 5.00 19.7Calcium 200.7 UG/L 100 510 5,000 3,030,000Chromium 200.7 UG/L 1 0.200 10.0 70.7Cobalt 200.7 UG/L 1 0.600 50.0 68.0

### A-2J – Result measured above the MDL, but less than the reporting limit.L – Sample result between 5x and 10x blank result.U – Result below the MDL. Number shown in parentheses is the reporting limit).NA – Not applicable. Calculated value.ND – Not detected (number in parenthesis is the report limit).NP – Not provided. The sample-specific MDL and sample-specific RLare only provided for the metal analytes because EPA is presenting analytical values formetals that are quantified below the report limit. For this analyte, only values above the report limit are presented. If the analyte was not detected above the reportlimit, the report limit is presented in parentheses in the concentration column.Table A-1. FGD Influent Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationCopper 200.7 UG/L 1 0.200 10.0 164Iron 200.7 UG/L 1 5.40 100 60,600Lead 200.7 UG/L 1 0.700 50.0 103Magnesium 200.7 UG/L 100 890 20,000 1,470,000Manganese 200.7 UG/L 100 20.0 1,500 28,800Mercury 245.1 UG/L 50 2.50 10.0 67.5Molybdenum 200.7 UG/L 1 0.200 10.0 65.0Nickel 200.7 UG/L 1 1.10 50.0 554Selenium 200.7 UG/L 1 0.600 5.00 2,130Silver 200.7 UG/L 1 0.400 20.0 ND (20.0) USodium 200.7 UG/L 10 405 5,000 314,000Thallium 200.7 UG/L 1 0.500 10.0 ND (10.0) UTin 200.7 UG/L 1 0.400 30.0 4.34 JTitanium 200.7 UG/L 1 0.200 10.0 377Vanadium 200.7 UG/L 1 0.600 20.0 203Yttrium 200.7 UG/L 1 0.200 5.00 64.9Zinc 200.7 UG/L 1 0.200 10.0 885Routine Metals – DissolvedAluminum 200.7 UG/L 1 10.6 50.0 ND (50.0) UAntimony 200.7 UG/L 1 0.700 20.0 15.8 JArsenic 200.7 UG/L 1 0.500 10.0 6.79 JBarium 200.7 UG/L 1 0.100 2.00 488Beryllium 200.7 UG/L 1 0.500 5.00 6.02

### A-3J – Result measured above the MDL, but less than the reporting limit.L – Sample result between 5x and 10x blank result.U – Result below the MDL. Number shown in parentheses is the reporting limit).NA – Not applicable. Calculated value.ND – Not detected (number in parenthesis is the report limit).NP – Not provided. The sample-specific MDL and sample-specific RLare only provided for the metal analytes because EPA is presenting analytical values formetals that are quantified below the report limit. For this analyte, only values above the report limit are presented. If the analyte was not detected above the reportlimit, the report limit is presented in parentheses in the concentration column.Table A-1. FGD Influent Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationBoron 200.7 UG/L 100 270 10,000 232,000Cadmium 200.7 UG/L 1 0.100 5.00 1.89 JCalcium 200.7 UG/L 100 510 5,000 2,350,000Chromium 200.7 UG/L 1 0.200 10.0 ND (10.0) UHexavalent Chromium D1687-92 UG/L 1 1.00 2.00 5.00Cobalt 200.7 UG/L 1 0.600 50.0 41.7 JCopper 200.7 UG/L 1 0.200 10.0 7.31 JIron 200.7 UG/L 1 5.40 100 ND (100) ULead 200.7 UG/L 1 0.700 50.0 ND (50.0) UMagnesium 200.7 UG/L 100 890 20,000 1,370,000Manganese 200.7 UG/L 100 20.0 1,500 27,900Mercury 245.1 UG/L 50 2.50 10.0 ND (10.0) UMolybdenum 200.7 UG/L 1 0.200 10.0 22.2Nickel 200.7 UG/L 1 1.10 50.0 355Selenium 200.7 UG/L 1 0.600 5.00 46.9Silver 200.7 UG/L 1 0.400 20.0 ND (20.0) USodium 200.7 UG/L 10 405 5,000 324,000Thallium 200.7 UG/L 1 0.500 10.0 ND (10.0) UTin 200.7 UG/L 1 0.400 30.0 ND (30.0) UTitanium 200.7 UG/L 1 0.200 10.0 ND (10.0) UVanadium 200.7 UG/L 1 0.600 20.0 ND (20.0) UYttrium 200.7 UG/L 1 0.200 5.00 2.34 JZinc 200.7 UG/L 1 0.200 10.0 87.8

### A-4J – Result measured above the MDL, but less than the reporting limit.L – Sample result between 5x and 10x blank result.U – Result below the MDL. Number shown in parentheses is the reporting limit).NA – Not applicable. Calculated value.ND – Not detected (number in parenthesis is the report limit).NP – Not provided. The sample-specific MDL and sample-specific RLare only provided for the metal analytes because EPA is presenting analytical values formetals that are quantified below the report limit. For this analyte, only values above the report limit are presented. If the analyte was not detected above the reportlimit, the report limit is presented in parentheses in the concentration column.Table A-1. FGD Influent Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationLow-Level Metals – TotalAntimony 1638 UG/L 50 0.350 1.00 9.23Arsenic 1638 UG/L 200 3.04 30.0 59.9Cadmium 1638 UG/L 50 0.0500 5.00 5.28Chromium 1638 UG/L 200 16.6 160 176 LCopper 1638 UG/L 200 0.800 40.0 139Lead 1638 UG/L 50 0.0500 2.50 68.1Mercury 1631E UG/L 200 0.0376 0.100 138Nickel 1638 UG/L 200 2.60 200 650Selenium 1638 UG/L 200 3.20 200 1,990Silver 1638 UG/L 50 0.100 5.00 0.730 JThallium 1638 UG/L 50 0.0200 1.00 6.33Zinc 1638 UG/L 200 41.8 100 730Low-Level Metals - DissolvedAntimony 1638 UG/L 10 0.0700 0.200 1.97Arsenic 1638 UG/L 100 1.52 15.0 20.2Cadmium 1638 UG/L 10 0.0100 1.00 0.446 JChromium 1638 UG/L 100 8.30 80.0 ND (80.0) UCopper 1638 UG/L 100 0.400 20.0 2.86 JLead 1638 UG/L 10 0.0100 0.500 ND (0.500) UMercury 1631E UG/L 1 0.000188 0.000500 0.0111Nickel 1638 UG/L 100 1.30 100 433Selenium 1638 UG/L 100 1.60 100 443

### A-5J – Result measured above the MDL, but less than the reporting limit.L – Sample result between 5x and 10x blank result.U – Result below the MDL. Number shown in parentheses is the reporting limit).NA – Not applicable. Calculated value.ND – Not detected (number in parenthesis is the report limit).NP – Not provided. The sample-specific MDL and sample-specific RLare only provided for the metal analytes because EPA is presenting analytical values formetals that are quantified below the report limit. For this analyte, only values above the report limit are presented. If the analyte was not detected above the reportlimit, the report limit is presented in parentheses in the concentration column.Table A-1. FGD Influent Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationSilver 1638 UG/L 10 0.0200 1.00 ND (1.00) UThallium 1638 UG/L 10 0.00400 0.200 4.47Zinc 1638 UG/L 100 20.9 50.0 160Low-Level Metals – Solid (dry weight)Antimony 1638 MG/KG NA 0.0490 0.140 1.02Arsenic 1638 MG/KG NA 0.425 4.20 5.55Cadmium 1638 MG/KG NA 0.00770 0.699 0.676 JChromium 1638 MG/KG NA 2.32 22.4 24.6Copper 1638 MG/KG NA 0.112 5.59 19.0Lead 1638 MG/KG NA 0.00700 0.350 9.52Mercury 1631E MG/KG NA 0.00530 0.0140 19.3Nickel 1638 MG/KG NA 0.364 28.0 30.3Selenium 1638 MG/KG NA 0.448 28.0 216Silver 1638 MG/KG NA 0.0140 0.699 0.102 JThallium 1638 MG/KG NA 0.00280 0.140 0.260Zinc 1638 MG/KG NA 5.85 14.0 79.7

### A-6J – Result measured above the MDL, but less than the reporting limit.U – Result below the MDL (number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).NP – Not provided. The sample-specific MDL and sample-specific RLare only provided for the metal analytes because EPA is presenting analytical values formetals that are quantified below the report limit. For this analyte, only values above the report limit are presented. If the analyte was not detected above the reportlimit, the report limit is presented in parentheses in the concentration column.Table A-2. FGD Primary Clarifier Effluent Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationClassical PollutantsAmmonia As Nitrogen (NH3-N) 4500-NH3F MG/L 1 NP NP 2.68Nitrate/Nitrite (NO3-N + NO2-N) 4500NO3H MG/L 100 NP NP 23.0Total Kjeldahl Nitrogen (TKN) 4500-N,C MG/L 1 NP NP 10.4Biochemical Oxygen Demand (BOD) SM 5210B MG/L 6 NP NP 30.0Chloride 4500-CL-C MG/L 10 NP NP 7,000Hexane Extractable Material (HEM) 1664A MG/L 1 NP NP 9.00Silica Gel Treated HEM (SGT-HEM) 1664A MG/L 1 NP NP ND (4.00) USulfate D516-90 MG/L 50 NP NP 1,880Total Dissolved Solids (TDS) 2540 C MG/L 1 NP NP 19,400Total Phosphorus 365.3 MG/L 1 NP NP 0.120Total Suspended Solids (TSS) 2540 D MG/L 1 NP NP 192Routine Metals – TotalAluminum 200.7 UG/L 1 10.6 50.0 ND (50.0) UAntimony 200.7 UG/L 1 0.700 20.0 12.0 JArsenic 200.7 UG/L 1 0.500 10.0 10.0Barium 200.7 UG/L 1 0.100 2.00 457Beryllium 200.7 UG/L 1 0.500 5.00 4.73 JBoron 200.7 UG/L 100 270 10,000 244,000Cadmium 200.7 UG/L 1 0.100 5.00 1.51 JCalcium 200.7 UG/L 100 510 5,000 2,650,000Chromium 200.7 UG/L 1 0.200 10.0 0.418 JCobalt 200.7 UG/L 1 0.600 50.0 7.07 J

### A-7J – Result measured above the MDL, but less than the reporting limit.U – Result below the MDL (number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).NP – Not provided. The sample-specific MDL and sample-specific RLare only provided for the metal analytes because EPA is presenting analytical values formetals that are quantified below the report limit. For this analyte, only values above the report limit are presented. If the analyte was not detected above the reportlimit, the report limit is presented in parentheses in the concentration column.Table A-2. FGD Primary Clarifier Effluent Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationCopper 200.7 UG/L 1 0.200 10.0 16.6Iron 200.7 UG/L 1 5.40 100 971Lead 200.7 UG/L 1 0.700 50.0 3.86 JMagnesium 200.7 UG/L 100 890 20,000 1,480,000Manganese 200.7 UG/L 10 2.00 150 7,380Mercury 245.1 UG/L 50 2.50 10.0 ND (10.0) UMolybdenum 200.7 UG/L 1 0.200 10.0 24.5Nickel 200.7 UG/L 1 1.10 50.0 55.5Selenium 200.7 UG/L 1 0.600 5.00 121Silver 200.7 UG/L 1 0.400 20.0 ND (20.0) USodium 200.7 UG/L 10 405 5,000 315,000Thallium 200.7 UG/L 1 0.500 10.0 ND (10.0) UTin 200.7 UG/L 1 0.400 30.0 0.694 JTitanium 200.7 UG/L 1 0.200 10.0 10.5Vanadium 200.7 UG/L 1 0.600 20.0 5.65 JYttrium 200.7 UG/L 1 0.200 5.00 2.73 JZinc 200.7 UG/L 1 0.200 10.0 46.4Routine Metals – DissolvedAluminum 200.7 UG/L 1 10.6 50.0 ND (50.0) UAntimony 200.7 UG/L 1 0.700 20.0 10.2 JArsenic 200.7 UG/L 1 0.500 10.0 3.25 JBarium 200.7 UG/L 1 0.100 2.00 401Beryllium 200.7 UG/L 1 0.500 5.00 4.31 JBoron 200.7 UG/L 100 270 10,000 217,000

### A-8J – Result measured above the MDL, but less than the reporting limit.U – Result below the MDL (number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).NP – Not provided. The sample-specific MDL and sample-specific RLare only provided for the metal analytes because EPA is presenting analytical values formetals that are quantified below the report limit. For this analyte, only values above the report limit are presented. If the analyte was not detected above the reportlimit, the report limit is presented in parentheses in the concentration column.Table A-2. FGD Primary Clarifier Effluent Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationCadmium 200.7 UG/L 1 0.100 5.00 1.18 JCalcium 200.7 UG/L 100 510 5,000 2,450,000Chromium 200.7 UG/L 1 0.200 10.0 ND (10.0) UHexavalent Chromium D1687-92 UG/L 1 1.00 2.00 15.0Cobalt 200.7 UG/L 1 0.600 50.0 5.89 JCopper 200.7 UG/L 1 0.200 10.0 12.0Iron 200.7 UG/L 1 5.40 100 57.4 JLead 200.7 UG/L 1 0.700 50.0 ND (50.0) UMagnesium 200.7 UG/L 100 890 20,000 1,300,000Manganese 200.7 UG/L 10 2.00 150 7,000Mercury 245.1 UG/L 50 2.50 10.0 ND (10.0) UMolybdenum 200.7 UG/L 1 0.200 10.0 21.9Nickel 200.7 UG/L 1 1.10 50.0 46.6 JSelenium 200.7 UG/L 1 0.600 5.00 82.3Silver 200.7 UG/L 1 0.400 20.0 ND (20.0) USodium 200.7 UG/L 10 405 5,000 305,000Thallium 200.7 UG/L 1 0.500 10.0 ND (10.0) UTin 200.7 UG/L 1 0.400 30.0 ND (30.0) UTitanium 200.7 UG/L 1 0.200 10.0 ND (10.0) UVanadium 200.7 UG/L 1 0.600 20.0 ND (20.0) UYttrium 200.7 UG/L 1 0.200 5.00 1.48 JZinc 200.7 UG/L 1 0.200 10.0 ND (10.0) ULow-Level Metals – TotalAntimony 1638 UG/L 10 0.0700 0.200 2.00

### A-9J – Result measured above the MDL, but less than the reporting limit.U – Result below the MDL (number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).NP – Not provided. The sample-specific MDL and sample-specific RLare only provided for the metal analytes because EPA is presenting analytical values formetals that are quantified below the report limit. For this analyte, only values above the report limit are presented. If the analyte was not detected above the reportlimit, the report limit is presented in parentheses in the concentration column.Table A-2. FGD Primary Clarifier Effluent Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationArsenic 1638 UG/L 100 1.52 15.0 12.0 JCadmium 1638 UG/L 10 0.0100 1.00 0.404 JChromium 1638 UG/L 100 8.30 80.0 32.8 JCopper 1638 UG/L 100 0.400 20.0 6.22 JLead 1638 UG/L 10 0.0100 0.500 2.01Mercury 1631E UG/L 10 0.00188 0.00500 2.38Nickel 1638 UG/L 100 1.30 100 63.4 JSelenium 1638 UG/L 100 1.60 100 234Silver 1638 UG/L 10 0.0200 1.00 ND (1.00) UThallium 1638 UG/L 10 0.00400 0.200 4.08Zinc 1638 UG/L 100 20.9 50.0 71.0Low-Level Metals - DissolvedAntimony 1638 UG/L 10 0.0700 0.200 1.75Arsenic 1638 UG/L 100 1.52 15.0 20.9Cadmium 1638 UG/L 10 0.0100 1.00 0.374 JChromium 1638 UG/L 100 8.30 80.0 35.3 JHexavalent Chromium 1636 UG/L 5 1.75 2.50 1.78 JCopper 1638 UG/L 100 0.400 20.0 8.54 JLead 1638 UG/L 10 0.0100 0.500 0.0276 JMercury 1631E UG/L 1 0.000188 0.000500 0.0190Nickel 1638 UG/L 100 1.30 100 123Selenium 1638 UG/L 100 1.60 100 472Silver 1638 UG/L 10 0.0200 1.00 ND (1.00) U

### A-10J – Result measured above the MDL, but less than the reporting limit.U – Result below the MDL (number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).NP – Not provided. The sample-specific MDL and sample-specific RLare only provided for the metal analytes because EPA is presenting analytical values formetals that are quantified below the report limit. For this analyte, only values above the report limit are presented. If the analyte was not detected above the reportlimit, the report limit is presented in parentheses in the concentration column.Table A-2. FGD Primary Clarifier Effluent Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationThallium 1638 UG/L 10 0.00400 0.200 4.11Zinc 1638 UG/L 100 20.9 50.0 34.9 J

### A-11J – Result measured above the MDL, but less than the reporting limit.R – MS/MSD % Recovery outside method acceptance criteria.T – MS/MSD RPD outside method acceptance criteria.U – Result below the MDL. Number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).NP – Not provided. The sample-specific MDL and sample-specific RLare only provided for the metal analytes because EPA is presenting analytical values formetals that are quantified below the report limit. For this analyte, only values above the report limit are presented. If the analyte was not detected above the reportlimit, the report limit is presented in parentheses in the concentration column.Table A-3. FGD Effluent Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationClassical PollutantsAmmonia As Nitrogen (NH3-N) 4500-NH3F MG/L 1 NP NP 3.26Nitrate/Nitrite (NO3-N + NO2-N) 4500NO3H MG/L 100 NP NP 25.4Total Kjeldahl Nitrogen (TKN) 4500-N,C MG/L 1 NP NP 9.37Biochemical Oxygen Demand (BOD) SM 5210B MG/L 1 NP NP ND (2.00) UChloride 4500-CL-C MG/L 10 NP NP 6,500Hexane Extractable Material (HEM) 1664A MG/L 1 NP NP 5.00Silica Gel Treated HEM (SGT-HEM) 1664A MG/L 1 NP NP ND (4.00) USulfate D516-90 MG/L 50 NP NP 1,760Total Dissolved Solids (TDS) 2540 C MG/L 1 NP NP 17,400Total Phosphorus 365.3 MG/L 1 NP NP 0.0700Total Suspended Solids (TSS) 2540 D MG/L 1 NP NP 20.0Routine Metals – TotalAluminum 200.7 UG/L 1 10.6 50.0 ND (50.0) UAntimony 200.7 UG/L 1 0.700 20.0 14.1 JArsenic 200.7 UG/L 1 0.500 10.0 10.6Barium 200.7 UG/L 1 0.100 2.00 434Beryllium 200.7 UG/L 1 0.500 5.00 4.48 JBoron 200.7 UG/L 100 270 10,000 210,000Cadmium 200.7 UG/L 1 0.100 5.00 1.20 JCalcium 200.7 UG/L 100 510 5,000 2,390,000Chromium 200.7 UG/L 1 0.200 10.0 ND (10.0) UCobalt 200.7 UG/L 1 0.600 50.0 5.75 J

### A-12J – Result measured above the MDL, but less than the reporting limit.R – MS/MSD % Recovery outside method acceptance criteria.T – MS/MSD RPD outside method acceptance criteria.U – Result below the MDL. Number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).NP – Not provided. The sample-specific MDL and sample-specific RLare only provided for the metal analytes because EPA is presenting analytical values formetals that are quantified below the report limit. For this analyte, only values above the report limit are presented. If the analyte was not detected above the reportlimit, the report limit is presented in parentheses in the concentration column.Table A-3. FGD Effluent Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationCopper 200.7 UG/L 1 0.200 10.0 16.8Iron 200.7 UG/L 1 5.40 100 331Lead 200.7 UG/L 1 0.700 50.0 4.92 JMagnesium 200.7 UG/L 100 890 20,000 1,290,000Manganese 200.7 UG/L 10 2.00 150 4,510Mercury 245.1 UG/L 50 2.50 10.0 ND (10.0) UMolybdenum 200.7 UG/L 1 0.200 10.0 23.3Nickel 200.7 UG/L 1 1.10 50.0 35.1 JSelenium 200.7 UG/L 1 0.600 5.00 85.1 RSilver 200.7 UG/L 1 0.400 20.0 ND (20.0) USodium 200.7 UG/L 10 405 5,000 312,000Thallium 200.7 UG/L 1 0.500 10.0 ND (10.0) UTin 200.7 UG/L 1 0.400 30.0 0.947 JTitanium 200.7 UG/L 1 0.200 10.0 10.2Vanadium 200.7 UG/L 1 0.600 20.0 ND (20.0) UYttrium 200.7 UG/L 1 0.200 5.00 1.62 JZinc 200.7 UG/L 1 0.200 10.0 15.4Routine Metals – DissolvedAluminum 200.7 UG/L 1 10.6 50.0 ND (50.0) UAntimony 200.7 UG/L 1 0.700 20.0 13.3 JArsenic 200.7 UG/L 1 0.500 10.0 3.15 JBarium 200.7 UG/L 1 0.100 2.00 390Beryllium 200.7 UG/L 1 0.500 5.00 4.29 J

### A-13J – Result measured above the MDL, but less than the reporting limit.R – MS/MSD % Recovery outside method acceptance criteria.T – MS/MSD RPD outside method acceptance criteria.U – Result below the MDL. Number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).NP – Not provided. The sample-specific MDL and sample-specific RLare only provided for the metal analytes because EPA is presenting analytical values formetals that are quantified below the report limit. For this analyte, only values above the report limit are presented. If the analyte was not detected above the reportlimit, the report limit is presented in parentheses in the concentration column.Table A-3. FGD Effluent Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationBoron 200.7 UG/L 100 270 10,000 198,000Cadmium 200.7 UG/L 1 0.100 5.00 1.09 JCalcium 200.7 UG/L 100 510 5,000 2,250,000Chromium 200.7 UG/L 1 0.200 10.0 ND (10.0) UHexavalent Chromium D1687-92 UG/L 1 1.00 2.00 10.0Cobalt 200.7 UG/L 1 0.600 50.0 5.30 JCopper 200.7 UG/L 1 0.200 10.0 13.9Iron 200.7 UG/L 1 5.40 100 82.0 JLead 200.7 UG/L 1 0.700 50.0 ND (50.0) UMagnesium 200.7 UG/L 100 890 20,000 1,220,000Manganese 200.7 UG/L 10 2.00 150 4,350Mercury 245.1 UG/L 50 2.50 10.0 ND (10.0) UMolybdenum 200.7 UG/L 1 0.200 10.0 21.1Nickel 200.7 UG/L 1 1.10 50.0 31.1 JSelenium 200.7 UG/L 1 0.600 5.00 71.2Silver 200.7 UG/L 1 0.400 20.0 ND (20.0) USodium 200.7 UG/L 10 405 5,000 302,000Thallium 200.7 UG/L 1 0.500 10.0 ND (10.0) UTin 200.7 UG/L 1 0.400 30.0 ND (30.0) UTitanium 200.7 UG/L 1 0.200 10.0 ND (10.0) UVanadium 200.7 UG/L 1 0.600 20.0 ND (20.0) UYttrium 200.7 UG/L 1 0.200 5.00 1.48 JZinc 200.7 UG/L 1 0.200 10.0 ND (10.0) U

### A-14J – Result measured above the MDL, but less than the reporting limit.R – MS/MSD % Recovery outside method acceptance criteria.T – MS/MSD RPD outside method acceptance criteria.U – Result below the MDL. Number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).NP – Not provided. The sample-specific MDL and sample-specific RLare only provided for the metal analytes because EPA is presenting analytical values formetals that are quantified below the report limit. For this analyte, only values above the report limit are presented. If the analyte was not detected above the reportlimit, the report limit is presented in parentheses in the concentration column.Table A-3. FGD Effluent Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationLow-Level Metals – TotalAntimony 1638 UG/L 50 0.350 1.00 ND (1.00) UArsenic 1638 UG/L 200 3.04 30.0 24.3 JCadmium 1638 UG/L 50 0.0500 5.00 0.903 JChromium 1638 UG/L 200 16.6 160 69.7 JCopper 1638 UG/L 200 0.800 40.0 10.1 JLead 1638 UG/L 50 0.0500 2.50 0.791 JMercury 1631E UG/L 1 0.000188 0.000500 0.809Nickel 1638 UG/L 200 2.60 200 102 JSelenium 1638 UG/L 200 3.20 200 417 TSilver 1638 UG/L 50 0.100 5.00 ND (5.00) UThallium 1638 UG/L 50 0.0200 1.00 4.01Zinc 1638 UG/L 200 41.8 100 ND (100) ULow-Level Metals - DissolvedAntimony 1638 UG/L 10 0.0700 0.200 1.60Arsenic 1638 UG/L 100 1.52 15.0 19.5 TCadmium 1638 UG/L 10 0.0100 1.00 0.334 JChromium 1638 UG/L 100 8.30 80.0 35.8 JHexavalent Chromium 1636 UG/L 5 1.75 2.50 2.21 JCopper 1638 UG/L 100 0.400 20.0 10.2 JLead 1638 UG/L 10 0.0100 0.500 0.0287 JMercury 1631E UG/L 1 0.000188 0.000500 0.166Nickel 1638 UG/L 100 1.30 100 103

### A-15J – Result measured above the MDL, but less than the reporting limit.R – MS/MSD % Recovery outside method acceptance criteria.T – MS/MSD RPD outside method acceptance criteria.U – Result below the MDL. Number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).NP – Not provided. The sample-specific MDL and sample-specific RLare only provided for the metal analytes because EPA is presenting analytical values formetals that are quantified below the report limit. For this analyte, only values above the report limit are presented. If the analyte was not detected above the reportlimit, the report limit is presented in parentheses in the concentration column.Table A-3. FGD Effluent Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationSelenium 1638 UG/L 100 1.60 100 413Silver 1638 UG/L 10 0.0200 1.00 ND (1.00) UThallium 1638 UG/L 10 0.00400 0.200 3.96Zinc 1638 UG/L 100 20.9 50.0 ND (50.0) U

### A-16J – Result measured above the MDL, but less than the reporting limit.U – Result below the MDL. Number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).NP – Not provided. The sample-specific MDL and sample-specific RLare only provided for the metal analytes because EPA is presenting analytical values formetals that are quantified below the report limit. For this analyte, only values above the report limit are presented. If the analyte was not detected above the reportlimit, the report limit is presented in parentheses in the concentration column.Table A-4. Duplicate of FGD Effluent Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationClassical PollutantsAmmonia As Nitrogen (NH3-N) 4500-NH3F MG/L 1 NP NP 3.71Nitrate/Nitrite (NO3-N + NO2-N) 4500NO3H MG/L 100 NP NP 25.3Total Kjeldahl Nitrogen (TKN) 4500-N,C MG/L 1 NP NP 10.1Biochemical Oxygen Demand (BOD) SM 5210B MG/L 4 NP NP 13.0Chloride 4500-CL-C MG/L 10 NP NP 6,900Sulfate D516-90 MG/L 50 NP NP 1,770Total Dissolved Solids (TDS) 2540 C MG/L 1 NP NP 17,900Total Phosphorus 365.3 MG/L 1 NP NP 0.0790Total Suspended Solids (TSS) 2540 D MG/L 1 NP NP 15.0Routine Metals – TotalAluminum 200.7 UG/L 1 10.6 50.0 ND (50.0) UAntimony 200.7 UG/L 1 0.700 20.0 12.2 JArsenic 200.7 UG/L 1 0.500 10.0 8.94 JBarium 200.7 UG/L 1 0.100 2.00 431Beryllium 200.7 UG/L 1 0.500 5.00 4.40 JBoron 200.7 UG/L 100 270 10,000 206,000Cadmium 200.7 UG/L 1 0.100 5.00 ND (5.00) UCalcium 200.7 UG/L 100 510 5,000 2,360,000Chromium 200.7 UG/L 1 0.200 10.0 ND (10.0) UCobalt 200.7 UG/L 1 0.600 50.0 5.32 JCopper 200.7 UG/L 1 0.200 10.0 15.5Iron 200.7 UG/L 1 5.40 100 304Lead 200.7 UG/L 1 0.700 50.0 3.64 J

### A-17J – Result measured above the MDL, but less than the reporting limit.U – Result below the MDL. Number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).NP – Not provided. The sample-specific MDL and sample-specific RLare only provided for the metal analytes because EPA is presenting analytical values formetals that are quantified below the report limit. For this analyte, only values above the report limit are presented. If the analyte was not detected above the reportlimit, the report limit is presented in parentheses in the concentration column.Table A-4. Duplicate of FGD Effluent Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationMagnesium 200.7 UG/L 100 890 20,000 1,260,000Manganese 200.7 UG/L 10 2.00 150 4,360Mercury 245.1 UG/L 50 2.50 10.0 ND (10.0) UMolybdenum 200.7 UG/L 1 0.200 10.0 22.4Nickel 200.7 UG/L 1 1.10 50.0 33.4 JSelenium 200.7 UG/L 1 0.600 5.00 82.0Silver 200.7 UG/L 1 0.400 20.0 ND (20.0) USodium 200.7 UG/L 10 405 5,000 298,000Thallium 200.7 UG/L 1 0.500 10.0 ND (10.0) UTin 200.7 UG/L 1 0.400 30.0 1.21 JTitanium 200.7 UG/L 1 0.200 10.0 6.61 JVanadium 200.7 UG/L 1 0.600 20.0 ND (20.0) UYttrium 200.7 UG/L 1 0.200 5.00 1.65 JZinc 200.7 UG/L 1 0.200 10.0 35.4Routine Metals – DissolvedAluminum 200.7 UG/L 1 10.6 50.0 ND (50.0) UAntimony 200.7 UG/L 1 0.700 20.0 12.5 JArsenic 200.7 UG/L 1 0.500 10.0 3.50 JBarium 200.7 UG/L 1 0.100 2.00 388Beryllium 200.7 UG/L 1 0.500 5.00 4.28 JBoron 200.7 UG/L 100 270 10,000 200,000Cadmium 200.7 UG/L 1 0.100 5.00 1.05 JCalcium 200.7 UG/L 100 510 5,000 2,290,000Chromium 200.7 UG/L 1 0.200 10.0 ND (10.0) U

### A-18J – Result measured above the MDL, but less than the reporting limit.U – Result below the MDL. Number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).NP – Not provided. The sample-specific MDL and sample-specific RLare only provided for the metal analytes because EPA is presenting analytical values formetals that are quantified below the report limit. For this analyte, only values above the report limit are presented. If the analyte was not detected above the reportlimit, the report limit is presented in parentheses in the concentration column.Table A-4. Duplicate of FGD Effluent Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationHexavalent Chromium D1687-92 UG/L 1 1.00 2.00 12.0Cobalt 200.7 UG/L 1 0.600 50.0 5.32 JCopper 200.7 UG/L 1 0.200 10.0 14.3Iron 200.7 UG/L 1 5.40 100 69.5 JLead 200.7 UG/L 1 0.700 50.0 ND (50.0) UMagnesium 200.7 UG/L 100 890 20,000 1,220,000Manganese 200.7 UG/L 10 2.00 150 3,880Mercury 245.1 UG/L 50 2.50 10.0 ND (10.0) UMolybdenum 200.7 UG/L 1 0.200 10.0 21.6Nickel 200.7 UG/L 1 1.10 50.0 30.9 JSelenium 200.7 UG/L 1 0.600 5.00 72.2Silver 200.7 UG/L 1 0.400 20.0 ND (20.0) USodium 200.7 UG/L 10 405 5,000 298,000Thallium 200.7 UG/L 1 0.500 10.0 ND (10.0) UTin 200.7 UG/L 1 0.400 30.0 ND (30.0) UTitanium 200.7 UG/L 1 0.200 10.0 ND (10.0) UVanadium 200.7 UG/L 1 0.600 20.0 ND (20.0) UYttrium 200.7 UG/L 1 0.200 5.00 1.65 JZinc 200.7 UG/L 1 0.200 10.0 ND (10.0) ULow-Level Metals – TotalAntimony 1638 UG/L 10 0.0700 0.200 1.73Arsenic 1638 UG/L 100 1.52 15.0 20.4Cadmium 1638 UG/L 10 0.0100 1.00 0.344 JChromium 1638 UG/L 100 8.30 80.0 35.6 J

### A-19J – Result measured above the MDL, but less than the reporting limit.U – Result below the MDL. Number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).NP – Not provided. The sample-specific MDL and sample-specific RLare only provided for the metal analytes because EPA is presenting analytical values formetals that are quantified below the report limit. For this analyte, only values above the report limit are presented. If the analyte was not detected above the reportlimit, the report limit is presented in parentheses in the concentration column.Table A-4. Duplicate of FGD Effluent Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationCopper 1638 UG/L 100 0.400 20.0 10.2 JLead 1638 UG/L 10 0.0100 0.500 0.121 JMercury 1631E UG/L 50 0.00940 0.0250 0.766Nickel 1638 UG/L 100 1.30 100 109Selenium 1638 UG/L 100 1.60 100 444Silver 1638 UG/L 10 0.0200 1.00 0.183 JThallium 1638 UG/L 10 0.00400 0.200 3.91Zinc 1638 UG/L 100 20.9 50.0 67.0Low-Level Metals - DissolvedAntimony 1638 UG/L 10 0.0700 0.200 1.68Arsenic 1638 UG/L 100 1.52 15.0 22.3Cadmium 1638 UG/L 10 0.0100 1.00 0.345 JChromium 1638 UG/L 100 8.30 80.0 37.6 JHexavalent Chromium 1636 UG/L 5 1.75 2.50 ND (2.50) UCopper 1638 UG/L 100 0.400 20.0 11.4 JLead 1638 UG/L 10 0.0100 0.500 0.0351 JMercury 1631E UG/L 1 0.000188 0.000500 0.152Nickel 1638 UG/L 100 1.30 100 100Selenium 1638 UG/L 100 1.60 100 400Silver 1638 UG/L 10 0.0200 1.00 0.598 JThallium 1638 UG/L 10 0.00400 0.200 4.01Zinc 1638 UG/L 100 20.9 50.0 46.0 J

### A-20J – Result measured above the MDL, but less than the reporting limit.U – Result below the MDL. Number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).NP – Not provided. The sample-specific MDL and sample-specific RLare only provided for the metal analytes because EPA is presenting analytical values formetals that are quantified below the report limit. For this analyte, only values above the report limit are presented. If the analyte was not detected above the reportlimit, the report limit is presented in parentheses in the concentration column.Table A-5. Fly Ash Pond EffluentAnalytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationClassical PollutantsAmmonia As Nitrogen (NH3-N) 4500-NH3F MG/L 1 NP NP 0.150Nitrate/Nitrite (NO3-N + NO2-N) 4500NO3H MG/L 20 NP NP 0.730Total Kjeldahl Nitrogen (TKN) 4500-N,C MG/L 1 NP NP ND (0.100) UBiochemical Oxygen Demand (BOD) SM 5210B MG/L 1 NP NP 2.00Chloride 4500-CL-C MG/L 1 NP NP 240Hexane Extractable Material (HEM) 1664A MG/L 1 NP NP ND (5.00) USulfate D516-90 MG/L 50 NP NP 1,110Total Dissolved Solids (TDS) 2540 C MG/L 1 NP NP 2,050Total Phosphorus 365.3 MG/L 1 NP NP 0.200Total Suspended Solids (TSS) 2540 D MG/L 1 NP NP 15.0Routine Metals – TotalAluminum 200.7 UG/L 1 10.6 50.0 404Antimony 200.7 UG/L 1 0.700 20.0 24.6Arsenic 200.7 UG/L 1 0.500 10.0 150Barium 200.7 UG/L 1 0.100 2.00 133Beryllium 200.7 UG/L 1 0.500 5.00 ND (5.00) UBoron 200.7 UG/L 1 2.70 100 2,350Cadmium 200.7 UG/L 1 0.100 5.00 ND (5.00) UCalcium 200.7 UG/L 1 5.10 50.0 115,000Chromium 200.7 UG/L 1 0.200 10.0 15.9Cobalt 200.7 UG/L 1 0.600 50.0 1.36 JCopper 200.7 UG/L 1 0.200 10.0 4.60 JIron 200.7 UG/L 1 5.40 100 85.0 J

### A-21J – Result measured above the MDL, but less than the reporting limit.U – Result below the MDL. Number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).NP – Not provided. The sample-specific MDL and sample-specific RLare only provided for the metal analytes because EPA is presenting analytical values formetals that are quantified below the report limit. For this analyte, only values above the report limit are presented. If the analyte was not detected above the reportlimit, the report limit is presented in parentheses in the concentration column.Table A-5. Fly Ash Pond EffluentAnalytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationLead 200.7 UG/L 1 0.700 50.0 ND (50.0) UMagnesium 200.7 UG/L 1 8.90 200 21,000Manganese 200.7 UG/L 1 0.200 15.0 13.9 JMercury 245.1 UG/L 1 0.0500 0.200 ND (0.200) UMolybdenum 200.7 UG/L 1 0.200 10.0 359Nickel 200.7 UG/L 1 1.10 50.0 7.41 JSelenium 200.7 UG/L 1 0.600 5.00 177Silver 200.7 UG/L 1 0.400 20.0 ND (20.0) USodium 200.7 UG/L 10 405 5,000 526,000Thallium 200.7 UG/L 1 0.500 10.0 ND (10.0) UTin 200.7 UG/L 1 0.400 30.0 ND (30.0) UTitanium 200.7 UG/L 1 0.200 10.0 6.61 JVanadium 200.7 UG/L 1 0.600 20.0 110Yttrium 200.7 UG/L 1 0.200 5.00 ND (5.00) UZinc 200.7 UG/L 1 0.200 10.0 ND (10.0) URoutine Metals – DissolvedAluminum 200.7 UG/L 1 10.6 50.0 241Antimony 200.7 UG/L 1 0.700 20.0 23.9Arsenic 200.7 UG/L 1 0.500 10.0 138Barium 200.7 UG/L 1 0.100 2.00 128Beryllium 200.7 UG/L 1 0.500 5.00 ND (5.00) UBoron 200.7 UG/L 1 2.70 100 2,290Cadmium 200.7 UG/L 1 0.100 5.00 ND (5.00) UCalcium 200.7 UG/L 1 5.10 50.0 113,000

### A-22J – Result measured above the MDL, but less than the reporting limit.U – Result below the MDL. Number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).NP – Not provided. The sample-specific MDL and sample-specific RLare only provided for the metal analytes because EPA is presenting analytical values formetals that are quantified below the report limit. For this analyte, only values above the report limit are presented. If the analyte was not detected above the reportlimit, the report limit is presented in parentheses in the concentration column.Table A-5. Fly Ash Pond EffluentAnalytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationChromium 200.7 UG/L 1 0.200 10.0 14.1Hexavalent Chromium D1687-92 UG/L 1 1.00 2.00 7.00Cobalt 200.7 UG/L 1 0.600 50.0 1.12 JCopper 200.7 UG/L 1 0.200 10.0 3.19 JIron 200.7 UG/L 1 5.40 100 ND (100) ULead 200.7 UG/L 1 0.700 50.0 ND (50.0) UMagnesium 200.7 UG/L 1 8.90 200 20,300Manganese 200.7 UG/L 1 0.200 15.0 2.94 JMercury 245.1 UG/L 1 0.0500 0.200 ND (0.200) UMolybdenum 200.7 UG/L 1 0.200 10.0 330Nickel 200.7 UG/L 1 1.10 50.0 6.37 JSelenium 200.7 UG/L 1 0.600 5.00 162Silver 200.7 UG/L 1 0.400 20.0 ND (20.0) USodium 200.7 UG/L 10 405 5,000 514,000Thallium 200.7 UG/L 1 0.500 10.0 ND (10.0) UTin 200.7 UG/L 1 0.400 30.0 ND (30.0) UTitanium 200.7 UG/L 1 0.200 10.0 ND (10.0) UVanadium 200.7 UG/L 1 0.600 20.0 108Yttrium 200.7 UG/L 1 0.200 5.00 ND (5.00) UZinc 200.7 UG/L 1 0.200 10.0 ND (10.0) ULow-Level Metals – TotalAntimony 1638 UG/L 5 0.0350 0.100 25.8Arsenic 1638 UG/L 5 0.0760 0.750 142Cadmium 1638 UG/L 5 0.00500 0.500 1.32

### A-23J – Result measured above the MDL, but less than the reporting limit.U – Result below the MDL. Number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).NP – Not provided. The sample-specific MDL and sample-specific RLare only provided for the metal analytes because EPA is presenting analytical values formetals that are quantified below the report limit. For this analyte, only values above the report limit are presented. If the analyte was not detected above the reportlimit, the report limit is presented in parentheses in the concentration column.Table A-5. Fly Ash Pond EffluentAnalytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationChromium 1638 UG/L 5 0.415 4.00 20.4Copper 1638 UG/L 5 0.0200 1.00 5.47Lead 1638 UG/L 5 0.00500 0.250 0.580Mercury 1631E UG/L 1 0.000188 0.000500 0.00212Nickel 1638 UG/L 5 0.0650 5.00 11.0Selenium 1638 UG/L 5 0.0800 5.00 191Silver 1638 UG/L 5 0.0100 0.500 0.0468 JThallium 1638 UG/L 5 0.00200 0.100 1.72Zinc 1638 UG/L 5 1.05 2.50 10.1Low-Level Metals - DissolvedAntimony 1638 UG/L 5 0.0350 0.100 22.5Arsenic 1638 UG/L 5 0.0760 0.750 131Cadmium 1638 UG/L 5 0.00500 0.500 1.17Chromium 1638 UG/L 5 0.415 4.00 16.0Hexavalent Chromium 1636 UG/L 5 1.75 2.50 17.4Copper 1638 UG/L 5 0.0200 1.00 4.54Lead 1638 UG/L 5 0.00500 0.250 0.218 JMercury 1631E UG/L 1 0.000188 0.000500 0.000388 JNickel 1638 UG/L 5 0.0650 5.00 9.57Selenium 1638 UG/L 5 0.0800 5.00 161Silver 1638 UG/L 5 0.0100 0.500 0.0161 JThallium 1638 UG/L 5 0.00200 0.100 1.42Zinc 1638 UG/L 5 1.05 2.50 9.51a – Barium was detected in two equipment blanks for #73 silicone tubing at 0.490 ug/L and 0. 476 ug/L. Because #73 silicone tubing was used in this fabricated tubing set, the barium concentration is assumed to be 0.490 ug/L. ND – Not detected (number in parenthesis is the report limit).



### A-24 Table A-6. Bottle Blank and Equipmen t Blank Analytical Data, Mitchell

Analyte Method Process Units Concentration

LDPE 250 ml Plastic Bottles – Bottle Blank (for low-level metals and low-level hexavalent chromium samples)

Aluminum EPA 1638 Dissolved UG/L ND (2.0)

Antimony EPA 1638 Dissolved UG/L ND (0.50)

Arsenic EPA 1638 Dissolved UG/L ND (0.50)

Barium EPA 1638 Dissolved UG/L ND (0.10)

Beryllium EPA 1638 Dissolved UG/L ND (0.10)

Cadmium EPA 1638 Dissolved UG/L ND (0.10)

Chromium EPA 1638 Dissolved UG/L ND (1.0)

Cobalt EPA 1638 Dissolved UG/L ND (0.10)

Copper EPA 1638 Dissolved UG/L ND (0.30)

Lead EPA 1638 Dissolved UG/L ND (0.050)

Manganese EPA 1638 Dissolved UG/L ND (0.50)

Molybdenum EPA 1638 Dissolved UG/L ND (0.50)

Nickel EPA 1638 Dissolved UG/L ND (0.50)

Selenium EPA 1638 Dissolved UG/L ND (2.0)

Silver EPA 1638 Dissolved UG/L ND (0.10)

Thallium EPA 1638 Dissolved UG/L ND (0.050)

Vanadium EPA 1638 Dissolved UG/L ND (1.0)

Zinc EPA 1638 Dissolved UG/L ND (0.50)

Flint 125 ml Amber Glass Bottles – Bottle Blank (for speciation samples)

Aluminum EPA 1638 Dissolved UG/L ND (2.0)

Antimony EPA 1638 Dissolved UG/L ND (0.50)

Arsenic EPA 1638 Dissolved UG/L ND (0.50)

Barium EPA 1638 Dissolved UG/L ND (0.10)

Beryllium EPA 1638 Dissolved UG/L ND (0.10)

Cadmium EPA 1638 Dissolved UG/L ND (0.10)

Chromium EPA 1638 Dissolved UG/L ND (1.0)

Cobalt EPA 1638 Dissolved UG/L ND (0.10)

Copper EPA 1638 Dissolved UG/L ND (0.30)

Lead EPA 1638 Dissolved UG/L ND (0.050)

Manganese EPA 1638 Dissolved UG/L ND (0.50)

Molybdenum EPA 1638 Dissolved UG/L ND (0.50)

Nickel EPA 1638 Dissolved UG/L ND (0.50)

Selenium EPA 1638 Dissolved UG/L ND (2.0)

Silver EPA 1638 Dissolved UG/L ND (0.10)

Thallium EPA 1638 Dissolved UG/L ND (0.050)

Vanadium EPA 1638 Dissolved UG/L ND (1.0)

Zinc EPA 1638 Dissolved UG/L ND (0.50)a – Barium was detected in two equipment blanks for #73 silicone tubing at 0.490 ug/L and 0. 476 ug/L. Because #73 silicone tubing was used in this fabricated tubing set, the barium concentration is assumed to be 0.490 ug/L. ND – Not detected (number in parenthesis is the report limit).



### A-25 Table A-6. Bottle Blank and Equipmen t Blank Analytical Data, Mitchell

Analyte Method Process Units Concentration

Flint 250 ml Glass Bottles – Bottle Blank (for low-level mercury samples)

Mercury EPA 1631E Total Recoverable UG/L ND (0.00020)

Capsule Filter – Equipment Blank (for di ssolved low-level metals sample collection)

Aluminum EPA 1638 Dissolved UG/L ND (2.0)

Antimony EPA 1638 Dissolved UG/L ND (0.50)

Arsenic EPA 1638 Dissolved UG/L ND (0.50)

Barium EPA 1638 Dissolved UG/L ND (0.10)

Beryllium EPA 1638 Dissolved UG/L ND (0.10)

Cadmium EPA 1638 Dissolved UG/L ND (0.10)

Chromium EPA 1638 Dissolved UG/L ND (1.0)

Cobalt EPA 1638 Dissolved UG/L ND (0.10)

Copper EPA 1638 Dissolved UG/L ND (0.30)

Lead EPA 1638 Dissolved UG/L ND (0.050)

Manganese EPA 1638 Dissolved UG/L ND (0.50)

Mercury EPA 1631E Dissolved UG/L ND (0.00020)

Molybdenum EPA 1638 Dissolved UG/L ND (0.50)

Nickel EPA 1638 Dissolved UG/L ND (0.50)

Selenium EPA 1638 Dissolved UG/L ND (2.0)

Silver EPA 1638 Dissolved UG/L ND (0.10)

Thallium EPA 1638 Dissolved UG/L ND (0.050)

Vanadium EPA 1638 Dissolved UG/L ND (1.0)

Zinc EPA 1638 Dissolved UG/L ND (0.50)

LDPE 2000 ml Plastic Bottles – Bottle Bl ank (for low-level metals field blank water)

Aluminum EPA 1638 Dissolved UG/L ND (2.0)

Antimony EPA 1638 Dissolved UG/L ND (0.50)

Arsenic EPA 1638 Dissolved UG/L ND (0.50)

Barium EPA 1638 Dissolved UG/L ND (0.10)

Beryllium EPA 1638 Dissolved UG/L ND (0.10)

Cadmium EPA 1638 Dissolved UG/L ND (0.10)

Chromium EPA 1638 Dissolved UG/L ND (1.0)

Cobalt EPA 1638 Dissolved UG/L ND (0.10)

Copper EPA 1638 Dissolved UG/L ND (0.30)

Lead EPA 1638 Dissolved UG/L ND (0.050)

Manganese EPA 1638 Dissolved UG/L ND (0.50)

Molybdenum EPA 1638 Dissolved UG/L ND (0.50)

Nickel EPA 1638 Dissolved UG/L ND (0.50)

Selenium EPA 1638 Dissolved UG/L ND (2.0)

Silver EPA 1638 Dissolved UG/L ND (0.10)a – Barium was detected in two equipment blanks for #73 silicone tubing at 0.490 ug/L and 0. 476 ug/L. Because #73 silicone tubing was used in this fabricated tubing set, the barium concentration is assumed to be 0.490 ug/L. ND – Not detected (number in parenthesis is the report limit).



### A-26 Table A-6. Bottle Blank and Equipmen t Blank Analytical Data, Mitchell

Analyte Method Process Units Concentration

Thallium EPA 1638 Dissolved UG/L ND (0.050)

Vanadium EPA 1638 Dissolved UG/L ND (1.0)

Zinc EPA 1638 Dissolved UG/L ND (0.50)

LDPE 4000 ml Plastic Bottles – Bottle Bl ank (for low-level metals field blank water)

Aluminum EPA 1638 Dissolved UG/L ND (2.0)

Antimony EPA 1638 Dissolved UG/L ND (0.50)

Arsenic EPA 1638 Dissolved UG/L ND (0.50)

Barium EPA 1638 Dissolved UG/L ND (0.10)

Beryllium EPA 1638 Dissolved UG/L ND (0.10)

Cadmium EPA 1638 Dissolved UG/L ND (0.10)

Chromium EPA 1638 Dissolved UG/L ND (1.0)

Cobalt EPA 1638 Dissolved UG/L ND (0.10)

Copper EPA 1638 Dissolved UG/L ND (0.30)

Lead EPA 1638 Dissolved UG/L ND (0.050)

Manganese EPA 1638 Dissolved UG/L ND (0.50)

Molybdenum EPA 1638 Dissolved UG/L ND (0.50)

Nickel EPA 1638 Dissolved UG/L ND (0.50)

Selenium EPA 1638 Dissolved UG/L ND (2.0)

Silver EPA 1638 Dissolved UG/L ND (0.10)

Thallium EPA 1638 Dissolved UG/L ND (0.050)

Vanadium EPA 1638 Dissolved UG/L ND (1.0)

Zinc EPA 1638 Dissolved UG/L ND (0.50)

Borosilicate 1000 ml Glass Bo ttles – Bottle Blank (for low- level mercury field blank water)

Mercury EPA 1631E Total Recoverable UG/L ND (0.00020)

LDPE 10 L Composite Bottles – Bottle Blank (sample composite bottle for dissolved/filtration pump-off)

Aluminum EPA 1638 Dissolved UG/L ND (2.0)

Antimony EPA 1638 Dissolved UG/L ND (0.50)

Arsenic EPA 1638 Dissolved UG/L ND (0.50)

Barium EPA 1638 Dissolved UG/L ND (0.10)

Beryllium EPA 1638 Dissolved UG/L ND (0.10)

Cadmium EPA 1638 Dissolved UG/L ND (0.10)

Chromium EPA 1638 Dissolved UG/L ND (1.0)

Cobalt EPA 1638 Dissolved UG/L ND (0.10)

Copper EPA 1638 Dissolved UG/L ND (0.30)

Lead EPA 1638 Dissolved UG/L ND (0.050)

Manganese EPA 1638 Dissolved UG/L ND (0.50)

Mercury EPA 1631E Total Recoverable UG/L ND (0.00020)

Molybdenum EPA 1638 Dissolved UG/L ND (0.50)a – Barium was detected in two equipment blanks for #73 silicone tubing at 0.490 ug/L and 0. 476 ug/L. Because #73 silicone tubing was used in this fabricated tubing set, the barium concentration is assumed to be 0.490 ug/L. ND – Not detected (number in parenthesis is the report limit).



### A-27 Table A-6. Bottle Blank and Equipmen t Blank Analytical Data, Mitchell

Analyte Method Process Units Concentration

Nickel EPA 1638 Dissolved UG/L ND (0.50)

Selenium EPA 1638 Dissolved UG/L ND (2.0)

Silver EPA 1638 Dissolved UG/L ND (0.10)

Thallium EPA 1638 Dissolved UG/L ND (0.050)

Vanadium EPA 1638 Dissolved UG/L ND (1.0)

Zinc EPA 1638 Dissolved UG/L ND (0.50)

Pump-Off Tubing Set – Equipment Blan k (Three feet of Teflon® tubing, 10 feet of #73 silicone tubing, Ysplitter, and two pieces of five feet of #24 silicone tubing for dissolved sample collection for low-level metals)

Aluminum EPA 1638 Dissolved UG/L ND (2.0)

Antimony EPA 1638 Dissolved UG/L ND (0.50)

Arsenic EPA 1638 Dissolved UG/L ND (0.50)

Barium a EPA 1638 Dissolved UG/L ND (0.10)

Beryllium EPA 1638 Dissolved UG/L ND (0.10)

Cadmium EPA 1638 Dissolved UG/L ND (0.10)

Chromium EPA 1638 Dissolved UG/L ND (1.0)

Cobalt EPA 1638 Dissolved UG/L ND (0.10)

Copper EPA 1638 Dissolved UG/L ND (0.30)

Lead EPA 1638 Dissolved UG/L ND (0.050)

Manganese EPA 1638 Dissolved UG/L ND (0.50)

Mercury EPA 1631E Total Recoverable UG/L ND (0.00020)

Molybdenum EPA 1638 Dissolved UG/L ND (0.50)

Nickel EPA 1638 Dissolved UG/L ND (0.50)

Selenium EPA 1638 Dissolved UG/L ND (2.0)

Silver EPA 1638 Dissolved UG/L ND (0.10)

Thallium EPA 1638 Dissolved UG/L ND (0.050)

Vanadium EPA 1638 Dissolved UG/L ND (1.0)

Zinc EPA 1638 Dissolved UG/L ND (0.50)

C-Flex Tubing Set – Equipment Blank (fi ve feet of #73 silicone tubing, Y-sp litter, and two pieces of five feet of #24 silicone tubing for sample collection for low-level mercury and lo w-level metals from sample taps)

Aluminum EPA 1638 Dissolved UG/L ND (2.0)

Antimony EPA 1638 Dissolved UG/L ND (0.50)

Arsenic EPA 1638 Dissolved UG/L ND (0.50)

Barium a EPA 1638 Dissolved UG/L 0.490

Beryllium EPA 1638 Dissolved UG/L ND (0.10)

Cadmium EPA 1638 Dissolved UG/L ND (0.10)

Chromium EPA 1638 Dissolved UG/L ND (1.0)

Cobalt EPA 1638 Dissolved UG/L ND (0.10)

Copper EPA 1638 Dissolved UG/L ND (0.30)

Lead EPA 1638 Dissolved UG/L ND (0.050)a – Barium was detected in two equipment blanks for #73 silicone tubing at 0.490 ug/L and 0. 476 ug/L. Because #73 silicone tubing was used in this fabricated tubing set, the barium concentration is assumed to be 0.490 ug/L. ND – Not detected (number in parenthesis is the report limit).



### A-28 Table A-6. Bottle Blank and Equipmen t Blank Analytical Data, Mitchell

Analyte Method Process Units Concentration

Manganese EPA 1638 Dissolved UG/L ND (0.50)

Mercury EPA 1631E Total Recoverable UG/L ND (0.00020)

Molybdenum EPA 1638 Dissolved UG/L ND (0.50)

Nickel EPA 1638 Dissolved UG/L ND (0.50)

Selenium EPA 1638 Dissolved UG/L ND (2.0)

Silver EPA 1638 Dissolved UG/L ND (0.10)

Thallium EPA 1638 Dissolved UG/L ND (0.050)

Vanadium EPA 1638 Dissolved UG/L ND (1.0)

Zinc EPA 1638 Dissolved UG/L ND (0.50)

C-Flex Tubing Set (alternate) – Equipm ent Blank (five feet of #73 silicone t ubing attached to five feet of #24 silicone tubing for alternative samp le collection for low-level mercury and low-level metals from sample taps)

Aluminum EPA 1638 Dissolved UG/L ND (2.0)

Antimony EPA 1638 Dissolved UG/L ND (0.50)

Arsenic EPA 1638 Dissolved UG/L ND (0.50)

Barium a EPA 1638 Dissolved UG/L 0.490

Beryllium EPA 1638 Dissolved UG/L ND (0.10)

Cadmium EPA 1638 Dissolved UG/L ND (0.10)

Chromium EPA 1638 Dissolved UG/L ND (1.0)

Cobalt EPA 1638 Dissolved UG/L ND (0.10)

Copper EPA 1638 Dissolved UG/L ND (0.30)

Lead EPA 1638 Dissolved UG/L ND (0.050)

Manganese EPA 1638 Dissolved UG/L ND (0.50)

Mercury EPA 1631E Total Recoverable UG/L ND (0.00020)

Molybdenum EPA 1638 Dissolved UG/L ND (0.50)

Nickel EPA 1638 Dissolved UG/L ND (0.50)

Selenium EPA 1638 Dissolved UG/L ND (2.0)

Silver EPA 1638 Dissolved UG/L ND (0.10)

Thallium EPA 1638 Dissolved UG/L ND (0.050)

Vanadium EPA 1638 Dissolved UG/L ND (1.0)

Zinc EPA 1638 Dissolved UG/L ND (0.50)

Tubing Set – Equipment Blank (25 feet of Teflon® tubi ng, 10 feet of #73 silicon e tubing, Y-splitter, two pieces of five feet of #24 silicon e tubing for sample co llection for low-level mercu ry and low-level metals from fly ash pond effluent)

Aluminum EPA 1638 Dissolved UG/L ND (2.0)

Antimony EPA 1638 Dissolved UG/L ND (0.50)

Arsenic EPA 1638 Dissolved UG/L ND (0.50)

Barium a EPA 1638 Dissolved UG/L 0.490

Beryllium EPA 1638 Dissolved UG/L ND (0.10)a – Barium was detected in two equipment blanks for #73 silicone tubing at 0.490 ug/L and 0. 476 ug/L. Because #73 silicone tubing was used in this fabricated tubing set, the barium concentration is assumed to be 0.490 ug/L. ND – Not detected (number in parenthesis is the report limit).



### A-29 Table A-6. Bottle Blank and Equipmen t Blank Analytical Data, Mitchell

Analyte Method Process Units Concentration

Cadmium EPA 1638 Dissolved UG/L ND (0.10)

Chromium EPA 1638 Dissolved UG/L ND (1.0)

Cobalt EPA 1638 Dissolved UG/L ND (0.10)

Copper EPA 1638 Dissolved UG/L ND (0.30)

Lead EPA 1638 Dissolved UG/L ND (0.050)

Manganese EPA 1638 Dissolved UG/L ND (0.50)

Mercury EPA 1631E Total Recoverable UG/L ND (0.00020)

Molybdenum EPA 1638 Dissolved UG/L ND (0.50)

Nickel EPA 1638 Dissolved UG/L ND (0.50)

Selenium EPA 1638 Dissolved UG/L ND (2.0)

Silver EPA 1638 Dissolved UG/L ND (0.10)

Thallium EPA 1638 Dissolved UG/L ND (0.050)

Vanadium EPA 1638 Dissolved UG/L ND (1.0)

Zinc EPA 1638 Dissolved UG/L ND (0.50)

Funnel Assembly Set – Equipment Blank (Plastic funnel attached to two feet of #73 silicone tubing, Ysplitter, and two pieces of five feet of #24 silicone tubing for field blank sample collection fo r low-level total mercury and low-level total metals at the FGD influent , FGD primary clarifier ov erflow, and FGD effluent)

Aluminum EPA 1638 Dissolved UG/L ND (2.0)

Antimony EPA 1638 Dissolved UG/L ND (0.50)

Arsenic EPA 1638 Dissolved UG/L ND (0.50)

Barium a EPA 1638 Dissolved UG/L 0.490

Beryllium EPA 1638 Dissolved UG/L ND (0.10)

Cadmium EPA 1638 Dissolved UG/L ND (0.10)

Chromium EPA 1638 Dissolved UG/L ND (1.0)

Cobalt EPA 1638 Dissolved UG/L ND (0.10)

Copper EPA 1638 Dissolved UG/L ND (0.30)

Lead EPA 1638 Dissolved UG/L ND (0.050)

Manganese EPA 1638 Dissolved UG/L ND (0.50)

Mercury EPA 1631E Total Recoverable UG/L ND (0.00020)

Molybdenum EPA 1638 Dissolved UG/L ND (0.50)

Nickel EPA 1638 Dissolved UG/L ND (0.50)

Selenium EPA 1638 Dissolved UG/L ND (2.0)

Silver EPA 1638 Dissolved UG/L ND (0.10)

Thallium EPA 1638 Dissolved UG/L ND (0.050)

Vanadium EPA 1638 Dissolved UG/L ND (1.0)

Zinc EPA 1638 Dissolved UG/L ND (0.50)

### A-30Table A-7. FGD Influent Field Blank Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationLow-Level Metals – TotalAntimony 1638 UG/L 1 0.00700 0.0200 ND (0.0200) UArsenic 1638 UG/L 1 0.0152 0.150 0.0161 JCadmium 1638 UG/L 1 0.00100 0.100 ND (0.100) UChromium 1638 UG/L 1 0.0830 0.800 0.169 JCopper 1638 UG/L 1 0.00400 0.200 ND (0.200) ULead 1638 UG/L 1 0.00100 0.0500 0.00520 JMercury 1631E UG/L 1 0.000188 0.000500 ND (0.000500) UNickel 1638 UG/L 1 0.0130 1.00 ND (1.00) USelenium 1638 UG/L 1 0.0160 1.00 ND (1.00) USilver 1638 UG/L 1 0.00200 0.100 0.00380 JThallium 1638 UG/L 1 0.000400 0.0200 0.00130 JZinc 1638 UG/L 1 0.209 0.500 ND (0.500) ULow-Level Metals - DissolvedAntimony 1638 UG/L 1 0.00700 0.0200 ND (0.0200) UArsenic 1638 UG/L 1 0.0152 0.150 ND (0.150) UCadmium 1638 UG/L 1 0.00100 0.100 ND (0.100) UChromium 1638 UG/L 1 0.0830 0.800 0.170 JCopper 1638 UG/L 1 0.00400 0.200 0.0949 JLead 1638 UG/L 1 0.00100 0.0500 0.00520 JNickel 1638 UG/L 1 0.0130 1.00 ND (1.00) USelenium 1638 UG/L 1 0.0160 1.00 ND (1.00) USilver 1638 UG/L 1 0.00200 0.100 ND (0.100) UThallium 1638 UG/L 1 0.000400 0.0200 ND (0.0200) UZinc 1638 UG/L 1 0.209 0.500 ND (0.500) UJ – Result measured above the MDL, but less than the reporting limit.U – Result below the MDL. Number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).

### A-31Table A-8. FGD Primary Clarifier Effluent Field Blank Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationLow-Level Metals – TotalAntimony 1638 UG/L 1 0.00700 0.0200 ND (0.0200) UArsenic 1638 UG/L 1 0.0152 0.150 0.0190 JCadmium 1638 UG/L 1 0.00100 0.100 ND (0.100) UChromium 1638 UG/L 1 0.0830 0.800 0.167 JCopper 1638 UG/L 1 0.00400 0.200 ND (0.200) ULead 1638 UG/L 1 0.00100 0.0500 0.00190 JMercury 1631E UG/L 1 0.000188 0.000500 ND (0.000500) UNickel 1638 UG/L 1 0.0130 1.00 ND (1.00) USelenium 1638 UG/L 1 0.0160 1.00 0.0249 JSilver 1638 UG/L 1 0.00200 0.100 ND (0.100) UThallium 1638 UG/L 1 0.000400 0.0200 ND (0.0200) UZinc 1638 UG/L 1 0.209 0.500 ND (0.500) ULow-Level Metals – DissolvedAntimony 1638 UG/L 1 0.00700 0.0200 ND (0.0200) UArsenic 1638 UG/L 1 0.0152 0.150 ND (0.150) UCadmium 1638 UG/L 1 0.00100 0.100 ND (0.100) UChromium 1638 UG/L 1 0.0830 0.800 0.148 JHexavalent Chromium 1636 UG/L 5 1.75 2.50 2.97Copper 1638 UG/L 1 0.00400 0.200 0.0299 JLead 1638 UG/L 1 0.00100 0.0500 ND (0.0500) UNickel 1638 UG/L 1 0.0130 1.00 ND (1.00) USelenium 1638 UG/L 1 0.0160 1.00 ND (1.00) USilver 1638 UG/L 1 0.00200 0.100 0.00290 JThallium 1638 UG/L 1 0.000400 0.0200 ND (0.0200) UZinc 1638 UG/L 1 0.209 0.500 ND (0.500) UJ – Result measured above the MDL, but less than the reporting limit.U – Result below the MDL. Number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).

### A-32J – Result measured above the MDL, but less than the reporting limit.U – Result below the MDL. Number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).Table A-9. FGD Effluent Field Blank Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationRoutine Metals – TotalAluminum 200.7 UG/L 1 10.6 50.0 ND (50.0) UAntimony 200.7 UG/L 1 0.700 20.0 ND (20.0) UArsenic 200.7 UG/L 1 0.500 10.0 ND (10.0) UBarium 200.7 UG/L 1 0.100 2.00 ND (2.00) UBeryllium 200.7 UG/L 1 0.500 5.00 ND (5.00) UBoron 200.7 UG/L 1 2.70 100 31.9 JCadmium 200.7 UG/L 1 0.100 5.00 ND (5.00) UCalcium 200.7 UG/L 1 5.10 50.0 235Chromium 200.7 UG/L 1 0.200 10.0 ND (10.0) UCobalt 200.7 UG/L 1 0.600 50.0 ND (50.0) UCopper 200.7 UG/L 1 0.200 10.0 ND (10.0) UIron 200.7 UG/L 1 5.40 100 ND (100) ULead 200.7 UG/L 1 0.700 50.0 ND (50.0) UMagnesium 200.7 UG/L 1 8.90 200 119 JManganese 200.7 UG/L 1 0.200 15.0 ND (15.0) UMercury 245.1 UG/L 1 0.0500 0.200 ND (0.200) UMolybdenum 200.7 UG/L 1 0.200 10.0 ND (10.0) UNickel 200.7 UG/L 1 1.10 50.0 ND (50.0) USelenium 200.7 UG/L 1 0.600 5.00 ND (5.00) USilver 200.7 UG/L 1 0.400 20.0 ND (20.0) USodium 200.7 UG/L 1 40.5 500 ND (500) UThallium 200.7 UG/L 1 0.500 10.0 ND (10.0) UTin 200.7 UG/L 1 0.400 30.0 ND (30.0) UTitanium 200.7 UG/L 1 0.200 10.0 ND (10.0) UVanadium 200.7 UG/L 1 0.600 20.0 ND (20.0) U

### A-33J – Result measured above the MDL, but less than the reporting limit.U – Result below the MDL. Number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).Table A-9. FGD Effluent Field Blank Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationYttrium 200.7 UG/L 1 0.200 5.00 ND (5.00) UZinc 200.7 UG/L 1 0.200 10.0 ND (10.0) URoutine Metals – DissolvedAluminum 200.7 UG/L 1 10.6 50.0 ND (50.0) UAntimony 200.7 UG/L 1 0.700 20.0 ND (20.0) UArsenic 200.7 UG/L 1 0.500 10.0 ND (10.0) UBarium 200.7 UG/L 1 0.100 2.00 0.644 JBeryllium 200.7 UG/L 1 0.500 5.00 ND (5.00) UBoron 200.7 UG/L 1 2.70 100 140Cadmium 200.7 UG/L 1 0.100 5.00 ND (5.00) UCalcium 200.7 UG/L 1 5.10 50.0 ND (50.0) UChromium 200.7 UG/L 1 0.200 10.0 ND (10.0) UHexavalent Chromium D1687-92 UG/L 1 1.00 2.00 ND (2.00) UCobalt 200.7 UG/L 1 0.600 50.0 ND (50.0) UCopper 200.7 UG/L 1 0.200 10.0 ND (10.0) UIron 200.7 UG/L 1 5.40 100 ND (100) ULead 200.7 UG/L 1 0.700 50.0 ND (50.0) UMagnesium 200.7 UG/L 1 8.90 200 807Manganese 200.7 UG/L 1 0.200 15.0 2.98 JMercury 245.1 UG/L 1 0.0500 0.200 ND (0.200) UMolybdenum 200.7 UG/L 1 0.200 10.0 ND (10.0) UNickel 200.7 UG/L 1 1.10 50.0 ND (50.0) USelenium 200.7 UG/L 1 0.600 5.00 ND (5.00) USilver 200.7 UG/L 1 0.400 20.0 ND (20.0) USodium 200.7 UG/L 1 40.5 500 ND (500) UThallium 200.7 UG/L 1 0.500 10.0 ND (10.0) U

### A-34J – Result measured above the MDL, but less than the reporting limit.U – Result below the MDL. Number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).Table A-9. FGD Effluent Field Blank Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationTin 200.7 UG/L 1 0.400 30.0 ND (30.0) UTitanium 200.7 UG/L 1 0.200 10.0 ND (10.0) UVanadium 200.7 UG/L 1 0.600 20.0 ND (20.0) UYttrium 200.7 UG/L 1 0.200 5.00 ND (5.00) UZinc 200.7 UG/L 1 0.200 10.0 ND (10.0) ULow-Level Metals – TotalAntimony 1638 UG/L 1 0.00700 0.0200 ND (0.0200) UArsenic 1638 UG/L 1 0.0152 0.150 ND (0.150) UCadmium 1638 UG/L 1 0.00100 0.100 ND (0.100) UChromium 1638 UG/L 1 0.0830 0.800 0.148 JCopper 1638 UG/L 1 0.00400 0.200 ND (0.200) ULead 1638 UG/L 1 0.00100 0.0500 0.00100 JMercury 1631E UG/L 1 0.000188 0.000500 ND (0.000500) UNickel 1638 UG/L 1 0.0130 1.00 ND (1.00) USelenium 1638 UG/L 1 0.0160 1.00 ND (1.00) USilver 1638 UG/L 1 0.00200 0.100 ND (0.100) UThallium 1638 UG/L 1 0.000400 0.0200 ND (0.0200) UZinc 1638 UG/L 1 0.209 0.500 ND (0.500) ULow-Level Metals - DissolvedAntimony 1638 UG/L 1 0.00700 0.0200 ND (0.0200) UArsenic 1638 UG/L 1 0.0152 0.150 ND (0.150) UCadmium 1638 UG/L 1 0.00100 0.100 ND (0.100) UChromium 1638 UG/L 1 0.0830 0.800 0.194 JHexavalent Chromium 1636 UG/L 5 1.75 2.50 ND (2.50) UCopper 1638 UG/L 1 0.00400 0.200 0.0213 JLead 1638 UG/L 1 0.00100 0.0500 0.00180 J

### A-35J – Result measured above the MDL, but less than the reporting limit.U – Result below the MDL. Number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).Table A-9. FGD Effluent Field Blank Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationNickel 1638 UG/L 1 0.0130 1.00 ND (1.00) USelenium 1638 UG/L 1 0.0160 1.00 ND (1.00) USilver 1638 UG/L 1 0.00200 0.100 ND (0.100) UThallium 1638 UG/L 1 0.000400 0.0200 0.000600 JZinc 1638 UG/L 1 0.209 0.500 ND (0.500) U

### A-36J – Result measured above the MDL, but less than the reporting limit.L – Sample result between 5x and 10x blank result.U – Result below the MDL. Number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).Table A-10. Fly Ash Pond Effluent Field Blank Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationRoutine Metals – TotalAluminum 200.7 UG/L 1 10.6 50.0 ND (50.0) UAntimony 200.7 UG/L 1 0.700 20.0 ND (20.0) UArsenic 200.7 UG/L 1 0.500 10.0 ND (10.0) UBarium 200.7 UG/L 1 0.100 2.00 ND (2.00) UBeryllium 200.7 UG/L 1 0.500 5.00 ND (5.00) UBoron 200.7 UG/L 1 2.70 100 ND (100) UCadmium 200.7 UG/L 1 0.100 5.00 ND (5.00) UCalcium 200.7 UG/L 1 5.10 50.0 113 LChromium 200.7 UG/L 1 0.200 10.0 ND (10.0) UCobalt 200.7 UG/L 1 0.600 50.0 ND (50.0) UCopper 200.7 UG/L 1 0.200 10.0 ND (10.0) UIron 200.7 UG/L 1 5.40 100 ND (100) ULead 200.7 UG/L 1 0.700 50.0 ND (50.0) UMagnesium 200.7 UG/L 1 8.90 200 ND (200) UManganese 200.7 UG/L 1 0.200 15.0 ND (15.0) UMercury 245.1 UG/L 1 0.0500 0.200 ND (0.200) UMolybdenum 200.7 UG/L 1 0.200 10.0 ND (10.0) UNickel 200.7 UG/L 1 1.10 50.0 ND (50.0) USelenium 200.7 UG/L 1 0.600 5.00 ND (5.00) USilver 200.7 UG/L 1 0.400 20.0 ND (20.0) USodium 200.7 UG/L 1 40.5 500 ND (500) UThallium 200.7 UG/L 1 0.500 10.0 ND (10.0) UTin 200.7 UG/L 1 0.400 30.0 ND (30.0) UTitanium 200.7 UG/L 1 0.200 10.0 ND (10.0) UVanadium 200.7 UG/L 1 0.600 20.0 ND (20.0) U

### A-37J – Result measured above the MDL, but less than the reporting limit.L – Sample result between 5x and 10x blank result.U – Result below the MDL. Number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).Table A-10. Fly Ash Pond Effluent Field Blank Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationYttrium 200.7 UG/L 1 0.200 5.00 ND (5.00) UZinc 200.7 UG/L 1 0.200 10.0 ND (10.0) URoutine Metals – DissolvedAluminum 200.7 UG/L 1 10.6 50.0 ND (50.0) UAntimony 200.7 UG/L 1 0.700 20.0 ND (20.0) UArsenic 200.7 UG/L 1 0.500 10.0 ND (10.0) UBarium 200.7 UG/L 1 0.100 2.00 ND (2.00) UBeryllium 200.7 UG/L 1 0.500 5.00 ND (5.00) UBoron 200.7 UG/L 1 2.70 100 21.5 JCadmium 200.7 UG/L 1 0.100 5.00 ND (5.00) UCalcium 200.7 UG/L 1 5.10 50.0 ND (50.0) UChromium 200.7 UG/L 1 0.200 10.0 ND (10.0) UHexavalent Chromium D1687-92 UG/L 1 1.00 2.00 ND (2.00) UCobalt 200.7 UG/L 1 0.600 50.0 ND (50.0) UCopper 200.7 UG/L 1 0.200 10.0 ND (10.0) UIron 200.7 UG/L 1 5.40 100 ND (100) ULead 200.7 UG/L 1 0.700 50.0 ND (50.0) UMagnesium 200.7 UG/L 1 8.90 200 95.2 JManganese 200.7 UG/L 1 0.200 15.0 ND (15.0) UMercury 245.1 UG/L 1 0.0500 0.200 ND (0.200) UMolybdenum 200.7 UG/L 1 0.200 10.0 ND (10.0) UNickel 200.7 UG/L 1 1.10 50.0 ND (50.0) USelenium 200.7 UG/L 1 0.600 5.00 ND (5.00) USilver 200.7 UG/L 1 0.400 20.0 ND (20.0) USodium 200.7 UG/L 1 40.5 500 ND (500) UThallium 200.7 UG/L 1 0.500 10.0 ND (10.0) U

### A-38J – Result measured above the MDL, but less than the reporting limit.L – Sample result between 5x and 10x blank result.U – Result below the MDL. Number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).Table A-10. Fly Ash Pond Effluent Field Blank Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationTin 200.7 UG/L 1 0.400 30.0 ND (30.0) UTitanium 200.7 UG/L 1 0.200 10.0 ND (10.0) UVanadium 200.7 UG/L 1 0.600 20.0 ND (20.0) UYttrium 200.7 UG/L 1 0.200 5.00 ND (5.00) UZinc 200.7 UG/L 1 0.200 10.0 ND (10.0) ULow-Level Metals – TotalAntimony 1638 UG/L 1 0.00700 0.0200 ND (0.0200) UArsenic 1638 UG/L 1 0.0152 0.150 ND (0.150) UCadmium 1638 UG/L 1 0.00100 0.100 ND (0.100) UChromium 1638 UG/L 1 0.0830 0.800 0.134 JCopper 1638 UG/L 1 0.00400 0.200 ND (0.200) ULead 1638 UG/L 1 0.00100 0.0500 0.00330 JMercury 1631E UG/L 1 0.000188 0.000500 ND (0.000500) UNickel 1638 UG/L 1 0.0130 1.00 ND (1.00) USelenium 1638 UG/L 1 0.0160 1.00 ND (1.00) USilver 1638 UG/L 1 0.00200 0.100 ND (0.100) UThallium 1638 UG/L 1 0.000400 0.0200 ND (0.0200) UZinc 1638 UG/L 1 0.209 0.500 ND (0.500) ULow-Level Metals - DissolvedAntimony 1638 UG/L 1 0.00700 0.0200 ND (0.0200) UArsenic 1638 UG/L 1 0.0152 0.150 ND (0.150) UCadmium 1638 UG/L 1 0.00100 0.100 ND (0.100) UChromium 1638 UG/L 1 0.0830 0.800 0.132 JHexavalent Chromium 1636 UG/L 5 1.75 2.50 2.02 JCopper 1638 UG/L 1 0.00400 0.200 0.111 JLead 1638 UG/L 1 0.00100 0.0500 0.00180 J

### A-39J – Result measured above the MDL, but less than the reporting limit.L – Sample result between 5x and 10x blank result.U – Result below the MDL. Number shown in parentheses is the reporting limit).ND – Not detected (number in parenthesis is the report limit).Table A-10. Fly Ash Pond Effluent Field Blank Analytical Data, MitchellAnalyteMethodUnitDilution FactorSample-Specific MDLSample-Specific RLConcentrationNickel 1638 UG/L 1 0.0130 1.00 ND (1.00) USelenium 1638 UG/L 1 0.0160 1.00 ND (1.00) USilver 1638 UG/L 1 0.00200 0.100 ND (0.100) UThallium 1638 UG/L 1 0.000400 0.0200 0.000500 JZinc 1638 UG/L 1 0.209 0.500 ND (0.500) U

### Appendix B

ANALYTICAL DATA FOR METALS, FG D WASTEWATER AND ASH POND

### B-1J - Result measured above the MDL, but less than the reporting limit.L - Sample result between 5x and 10x blank result.R – MS/MSD % Recovery outside method acceptance criteria.T – MS/MSD RPD outside method acceptance criteria.U - Result below the MDL. Number shownin parentheses is the reporting limit).NA – Not analyzed.ND – Not detected (number in parenthesis is the report limit).Note: Results shown are not paired samples. See Section 4.2.Table B-1. Analytical Resultsfor Metals in the FGD Wastewater Treatment System, MitchellFGD Influent (SP-1)FGD Primary ClarifierEffluent (SP-2)Original FGD Effluent (SP-3)Duplicate FGD Effluent(SP-5)AnalyteMethodUnitTotalDissolvedTotalDissolvedTotalDissolvedTotalDissolvedRoutine MetalsAluminum 200.7 UG/L 17,900 ND (50.0) UND (50.0) U ND (50.0) U ND (50.0) UND (50.0) U ND (50.0) U ND (50.0) UAntimony 200.7 UG/L 28.7 15.8 J 12.0J 10.2 J 14.1 J 13.3 J 12.2 J 12.5 JArsenic 200.7 UG/L 72.5 6.79 J 10.03.25 J 10.6 3.15 J 8.94 J 3.50 JBarium 200.7 UG/L 588 488 457 401 434 390 431 388Beryllium 200.7 UG/L 8.04 6.02 4.73J 4.31 J 4.48 J 4.29 J 4.40 J 4.28 JBoron 200.7 UG/L 229,000 232,000 244,000217,000 210,000 198,000 206,000 200,000Cadmium 200.7 UG/L 19.7 1.89 J 1.51 J 1.18 J 1.20 J 1.09 J ND (5.00) U 1.05 JCalcium 200.7 UG/L 3,030,000 2,350,000 2,650,000 2,450,000 2,390,0002,250,000 2,360,000 2,290,000Chromium 200.7 UG/L 70.7 ND (10.0)U 0.418 J ND (10.0) U ND (10.0) U ND(10.0) U ND (10.0) U ND (10.0) UHexavalentChromiumD1687-92 UG/L NA 5.00 NA 15.0 NA 10.0 NA 12.0Cobalt 200.7 UG/L 68.0 41.7 J 7.07 J 5.89 J 5.75 J 5.30 J 5.32 J 5.32 JCopper 200.7 UG/L 164 7.31 J 16.612.0 16.8 13.9 15.5 14.3Iron 200.7 UG/L 60,600 ND (100) U 971 57.4 J 331 82.0 J 304 69.5 JLead 200.7 UG/L 103 ND (50.0) U 3.86 J ND (50.0) U 4.92 J ND (50.0) U 3.64 J ND (50.0) UMagnesium 200.7 UG/L 1,470,000 1,370,000 1,480,000 1,300,000 1,290,0001,220,000 1,260,000 1,220,000Manganese 200.7 UG/L 28,80027,900 7,380 7,000 4,510 4,350 4,360 3,880Mercury 245.1 UG/L 67.5 ND (10.0) U ND(10.0) U ND (10.0) U ND (10.0) UND (10.0) U ND (10.0) U ND (10.0) UMolybdenum 200.7 UG/L 65.0 22.2 24.521.9 23.3 21.1 22.4 21.6Nickel 200.7 UG/L 554 355 55.546.6 J 35.1 J 31.1 J 33.4 J 30.9 JSelenium 200.7 UG/L 2,130 46.9 12182.3 85.1 R 71.2 82.0 72.2Silver 200.7 UG/L ND (20.0) U ND (20.0) U ND (20.0) U ND (20.0) U ND (20.0) U ND (20.0)U ND (20.0) U ND (20.0) U

### B-2J - Result measured above the MDL, but less than the reporting limit.L - Sample result between 5x and 10x blank result.R – MS/MSD % Recovery outside method acceptance criteria.T – MS/MSD RPD outside method acceptance criteria.U - Result below the MDL. Number shownin parentheses is the reporting limit).NA – Not analyzed.ND – Not detected (number in parenthesis is the report limit).Note: Results shown are not paired samples. See Section 4.2.Table B-1. Analytical Resultsfor Metals in the FGD Wastewater Treatment System, MitchellFGD Influent (SP-1)FGD Primary ClarifierEffluent (SP-2)Original FGD Effluent (SP-3)Duplicate FGD Effluent(SP-5)AnalyteMethodUnitTotalDissolvedTotalDissolvedTotalDissolvedTotalDissolvedSodium 200.7 UG/L 314,000 324,000 315,000305,000 312,000 302,000 298,000 298,000Thallium 200.7 UG/L ND (10.0) U ND (10.0)U ND (10.0) U ND (10.0) U ND (10.0)U ND (10.0) U ND (10.0) U ND (10.0) UTin 200.7 UG/L 4.34 J ND (30.0) U 0.694 J ND (30.0) U 0.947 J ND (30.0) U 1.21 J ND (30.0) UTitanium 200.7 UG/L 377 ND (10.0) U 10.5 ND (10.0) U 10.2 ND (10.0)U 6.61 J ND (10.0) UVanadium 200.7 UG/L 203 ND (20.0) U 5.65 J ND (20.0) U ND (20.0) U ND(20.0) U ND (20.0) U ND (20.0) UYttrium 200.7 UG/L 64.9 2.34 J 2.73J 1.48 J 1.62 J 1.48 J 1.65 J 1.65 JZinc 200.7 UG/L 885 87.8 46.4 ND (10.0)U 15.4 ND (10.0) U 35.4 ND (10.0) ULow-Level MetalsAntimony 1638 UG/L 9.23 1.97 2.00 1.75 ND (1.00) U 1.60 1.73 1.68Arsenic 1638 UG/L 59.9 20.2 12.0 J20.9 24.3 J 19.5 T 20.4 22.3Cadmium 1638 UG/L 5.28 0.446 J 0.404 J 0.374 J 0.903 J 0.334 J 0.344 J 0.345 JChromium 1638 UG/L 176 L ND (80.0) U 32.8 J 35.3 J 69.7 J 35.8 J 35.6 J 37.6 JHexavalentChromium1636 UG/L NA NA NA 1.78 J NA 2.21 J NA ND (2.50) UCopper 1638 UG/L 139 2.86 J 6.22 J 8.54 J 10.1 J 10.2 J 10.2 J 11.4 JLead 1638 UG/L 68.1 ND (0.500) U 2.010.0276 J 0.791 J 0.0287 J 0.121 J 0.0351 JMercury 1631E UG/L 138 0.0111 2.380.0190 0.809 0.166 0.766 0.152Nickel 1638 UG/L 650 433 63.4 J 123 102 J 103 109 100Selenium 1638 UG/L 1,990 443 234 472 417 T 413 444 400Silver 1638 UG/L 0.730 J ND (1.00) U ND (1.00) U ND(1.00) U ND (5.00) U ND(1.00) U 0.183 J 0.598 JThallium 1638 UG/L 6.33 4.47 4.084.11 4.01 3.96 3.91 4.01Zinc 1638 UG/L 730 160 71.0 34.9 J ND(100) U ND (50.0) U 67.0 46.0 JJ – Result measured above the MDL, but less than the reporting limit. L – Sample result between 5x and 10x blank result. ND – Not detected (number in parenthesis is the report limit). U – Result below the MDL. (Number shown in parentheses is the reporting limit).



### B-3 Table B-2. Analytical Result s for Metals in the Fly As h Pond Effluent, Mitchell

Fly Ash Pond Effluent (SP-4) Analyte Method Unit Total Dissolved

Routine Metals

Aluminum 200.7 UG/L 404 241

Antimony 200.7 UG/L 24.6 23.9

Arsenic 200.7 UG/L 150 138

Barium 200.7 UG/L 133 128

Beryllium 200.7 UG/L ND (5.00) U ND (5.00) U

Boron 200.7 UG/L 2,350 2,290

Cadmium 200.7 UG/L ND (5.00) U ND (5.00) U

Calcium 200.7 UG/L 115,000 113,000

Chromium 200.7 UG/L 15.9 14.1

Hexavalent Chromium D1687-92 UG/L NA 7.00

Cobalt 200.7 UG/L 1.36 J 1.12 J

Copper 200.7 UG/L 4.60 J 3.19 J

Iron 200.7 UG/L 85.0 J ND (100) U

Lead 200.7 UG/L ND (50.0) U ND (50.0) U

Magnesium 200.7 UG/L 21,000 20,300

Manganese 200.7 UG/L 13.9 J 2.94 J

Mercury 245.1 UG/L ND (0.200) U ND (0.200) U

Molybdenum 200.7 UG/L 359 330

Nickel 200.7 UG/L 7.41 J 6.37 J

Selenium 200.7 UG/L 177 162

Silver 200.7 UG/L ND (20.0) U ND (20.0) U

Sodium 200.7 UG/L 526,000 514,000

Thallium 200.7 UG/L ND (10.0) U ND (10.0) U

Tin 200.7 UG/L ND (30.0) U ND (30.0) U

Titanium 200.7 UG/L 6.61 J ND (10.0) U

Vanadium 200.7 UG/L 110 108

Yttrium 200.7 UG/L ND (5.00) U ND (5.00) U

Zinc 200.7 UG/L ND (10.0) U ND (10.0) U

Low-Level Metals – Total

Antimony 1638 UG/L 25.8 22.5

Arsenic 1638 UG/L 142 131

Cadmium 1638 UG/L 1.32 1.17

Chromium 1638 UG/L 20.4 16.0

Hexavalent Chromium 1636 UG/L NA 17.4

Copper 1638 UG/L 5.47 4.54

Lead 1638 UG/L 0.580 0.218 JJ – Result measured above the MDL, but less than the reporting limit. L – Sample result between 5x and 10x blank result. ND – Not detected (number in parenthesis is the report limit). U – Result below the MDL. (Number shown in parentheses is the reporting limit).



### B-4 Table B-2. Analytical Result s for Metals in the Fly As h Pond Effluent, Mitchell

Fly Ash Pond Effluent (SP-4) Analyte Method Unit Total Dissolved

Mercury 1631E UG/L 0.00212 0.000388 J

Nickel 1638 UG/L 11.0 9.57

Selenium 1638 UG/L 191 161

Silver 1638 UG/L 0.0468 J 0.0161 J

Thallium 1638 UG/L 1.72 1.42

Zinc 1638 UG/L 10.1 9.51

### Appendix C

DATA REVIEW NARRATIVESComputer Sciences Corporation

www.csc.com

6101 Stevenson Avenue Alexandria, Virginia 22304

703.461.2000 Fax 703.461.2020 

### MEMORANDUM

DATE: January 4, 2007

TO: Ron Jordan, Project Officer

EPA EAD

FROM: Sara Clark, Quality Assurance Chemist Computer Sciences Corporation

SUBJECT: Data Review Narrative for Classical Anal yses for the Steam Electric Power Study, Episode 6550

OVERVIEW

Under EPA Contract Number 68-C-03-058, ProChem Analytical, Inc. submitted classical wet chemistry

data for seven samples in Episode 6550. Sample 70620, id entified as the FGD influent, was expected to contain a significant and variable particulate con centration. EPA and industry representatives were concerned that the variable nature of the sample would 1) complicate the collection of a representative sample for both EPA and industry analyses and 2) lead to analytical interferences. Therefore, for some classical analyses, the laboratory was directed by EPA to separate the FGD influent sample into an aqueous-phase and a solid-phase and analyze each if the to tal solids of the original sample was greater or equal to 1%. However, because the total solids for the FGD influent sample was < 1%, the sample was not phase separated.

Table 1 provides a complete listing of samples, matr ices, descriptions, sampling dates, and the required analytes.

Table 1 - Sample Identifiers, Descri ptions, Sampling Dates and Analytes

EPA Sample # Matrix Sample Description Sampling

Date Analytes

70620 Aqueous SP-1 FGD Influent 10/17/07 BOD (SM 5210B), HEM (1664A), SGT-HEM (1664A), Hexavalent Chromium (ASTM D1687-92),

TSS (SM 2540D), TDS (SM 2540C), Chloride (SM 4500-Cl

- C),

Sulfate (ASTM D516-90), TKN (SM 4500-N C), Ammonia (SM 4500-NH3 F), Total Phosphorus (365.3), and Nitrate/Nitrite (SM 4500-NO3 H)

70621 Aqueous SP-2 FGD Primary

Clarifier 10/17/07 BOD (SM 5210B), HEM (1664A), SGT-HEM (1664A), Hexavalent Chromium (ASTM D1687-92),

TSS (SM 2540D), TDS (SM 2540C), Chloride (SM 4500-Cl

- C),

Sulfate (ASTM D516-90), TKN (SM 4500-N C), Ammonia (SM 4500-NH3 F), Total Phosphorus (365.3), and Nitrate/Nitrite (SM 4500-NO3 H)2 Table 1 - Sample Identifiers, Descri ptions, Sampling Dates and Analytes

EPA Sample # Matrix Sample Description Sampling

Date Analytes

70622 Aqueous SP-3 FGD Effluent 10/17/07 BOD (SM 5210B), HEM (1664A), SGT-HEM (1664A), Hexavalent Chromium (ASTM D1687-92),

TSS (SM 2540D), TDS (SM 2540C), Chloride (SM 4500-Cl

- C),

Sulfate (ASTM D516-90), TKN (SM 4500-N C), Ammonia (SM 4500-NH3 F), Total Phosphorus (365.3), and Nitrate/Nitrite (SM 4500-NO3 H)

70623 Aqueous SP-4 Fly Ash Pond

Effluent 10/18/07 BOD (SM 5210B), HEM (1664A), SGT-HEM (1664A), Hexavalent Chromium (ASTM D1687-92),

TSS (SM 2540D), TDS (SM 2540C), Chloride (SM 4500-Cl

- C),

Sulfate (ASTM D516-90), TKN (SM 4500-N C), Ammonia (SM 4500-NH3 F), Total Phosphorus (365.3), and Nitrate/Nitrite (SM 4500-NO3 H)

70624 Aqueous SP-5 FGD Effluent Duplicate 10/17/07 BOD (SM 5210B), Hexavalent Chromium (ASTM D1687-92),

TSS (SM 2540D), TDS (SM 2540C), Chloride (SM 4500-Cl

- C),

Sulfate (ASTM D516-90), TKN (SM 4500-N C), Ammonia (SM 4500-NH3 F), Total Phosphorus (365.3), and Nitrate/Nitrite (SM 4500-NO3 H)

70627 Aqueous SP-8 FGD Effluent

Field Blank 10/17/07 Hexavalent Chromium (ASTM D1687-92)

70628 Aqueous SP-9 Fly Ash Pond

Effluent Field Blank 10/18/07 Hexavalent Chromium (ASTM D1687-92)



### These data have been reviewed in accordance with CSC’s Data Review Guidelines for Classical Wet Chemistry Analyses (DR-02 Revision 2, September 1, 2007) and with the specifications listed in the contract. All data are of acceptable quality with th e qualifiers described below and detailed in the data review summary table (Table 2).

SUMMARY

All samples were analyzed within the contract-sp ecified holding times for all classical wet chemistry parameters specified in the sampling and analysis plan. The calibration and continuing calibration standards were successfully analyzed. Laboratory bla nks were performed for each analysis, and there was no contamination detected above the laboratory reporti ng limits, with the exceptions described below. An effluent and influent field blank were analyzed for hexavalent chromium and the analyte was not detected above the minimum level (ML) in either blank. The QC samples, including the ongoing precision and recovery sample (OPR) and matrix spike/matrix spik e duplicate (MS/MSD) samples, demonstrated that laboratory performance for these analyses was acceptab le, with the exceptions described below. The MS/MSDs analyses were performed on sample 70622.3 

### DATA ISSUES

Nitrate and Nitrite

Nitrate/Nitrite was detected in the laboratory calibra tion blank at a concentration of 0.023 mg/L, which is greater than the ML of 0.01 mg/L. The Nitrate/Nitr ite results for the associated samples are greater than ten times the blank result. Because the presence of th e analyte in the blank does not adversely affect the data when the result is greater than ten times the asso ciated blank, the Nitrate/Nitrite data are acceptable without qualification for all associated samples.

SGT-HEM

The MS/MSD relative percent difference (RPD) fo r sample 70622 was 75%, which is above the methodspecified acceptance criteria of 34%. The MSD reco very (129%) was acceptable, but the MS recovery (59%) was below method-specified acceptance crite ria (64-132%). However, because SGT-HEM was not detected in sample 70622, CSC recommends that the result be included in the database without qualification.

TKN

TKN was detected in the laboratory preparation blank at a concentration of 0.24 mg/L, which is greater than the ML of 0.1 mg/L. The TKN results for the associated samples 7062 0, 70621, 70 622, and 70624 are greater than ten times the blank result. Becau se the presence of the analyt e in the blank does not adversely affect the data when the result is greater than ten times the associated blank, these TKN sample results are acceptable without qualification. The TKN result for sample 70623 is less than five times the blank result. When the sample result is less than fi ve times the blank result, there are no means by which to ascertain whether or not the presence of the analyte may be attributed to contamination. Therefore, CSC recommends that the TKN result for sample 70623 be reported in the database as a not detected at the ML, adjusted for sample size, dilution, and matrices.

BOD

Three of the four GGA standard recoveries ( 83%, 75%, and 81%) were below method-specified acceptance criteria of 84-116%. CSC considers the BOD results for the associated samples (70620, 70621, 70622, 70623, and 70624) to be of accep table quality, but may be minimum values.

Field Duplicate

The RPD for field duplicates 70622 and 70624 (FGD Effluent and FGD Effluent Field Duplicate) total suspended solids results is 29%. CSC does not rout inely qualify results based on field duplicate RPD

failure.

TECHNICAL NOTES:

Although HEM/SGT-HEM analyses were requested for sample 70623, SGT-HEM analysis was not performed because HEM was not detected in this sample.4 

### If you have any questions regarding the analyses of these samples or the review of these data, please contact Barbara Beard by telephone at (703) 461-2154 , by facsimile at (703) 461-8056, or by email at

bbeard2@csc.com.

cc: Brian D’Amico, EPA Beverly Randolph, EPA Marla Smith, EPA Nelson Andrews, EPA Brian Englert, EPA Deb Bartram, ERG TJ Finseth, ERG Lynn Walters, CSC Barbara Beard, CSC

Table 2 Data Review Summary Table

Episode: 6550 Analysis: Classicals

Industry: Steam Electric Power Study Reviewer: Sara Clark

Sample Analyte Action Reason CSC Qual Level

70623 TKN Report in

database as

non-detect Sample result <5x

blank result NA

70620

70621

70622

70623

70624 BOD Minimum value GGA standard recovery below method-specified

criteria NA See Database

NA= Not ApplicableC o m put er Sci e nces C o r p orat i on

ww w.csc

. com



### MEMORANDUM

DATE: January 0 9 , 2 008

TO: Ron Jordan, Work Assignment Manager

EPA EAD

FROM: Lisa White, Quality Assurance Chem i s t
Co m puter Sciences Corporation

SUBJECT: Data R e view Narrative for Total and Dissolv ed Metals Analy ses for the Stea m Ele c tric

Stud y
, E p iso d e 6550

Under EPA contract num ber 68-C-03-0 44, ProChem Analy tical subm itted da ta for the anal y s is of metals

b y EPA Meth od 2 00.7 and mercury b y Method 2 45. 1. Seven aque ous sam p les in this episode were analy zed for total and dissolved m e t a ls. Becaus e infl uent sa m p les f o r this study were expect e d to be highly variable in solids content, th e laboratory was directed to obtai n results for the solid phase if the total solids of the original s a m p le w e re greater or equa l to 1%. However, becau se the total solids for the

FGD influent sa m p le w e re < 1%, the sa m p l e was not phase separat ed.

Table 1 provides a list of sa m p les, matri ces, desc riptions, sa m p ling dates, phases , and the required analy tical m e thods.

Table 1 - Sam p le Identifiers , Des criptions , Sa mpling Da tes, a nd A n a l ysis M e thods

EPA Sample # Ma trix Sample Descri ption Sa mpling

Da te P h a s e M e t h o d

To tal 70 6 20 Aq ue ous SP-1

FG D I n fl ue nt 10/ 17/ 07 Dissol v ed 20 0. 7, 2 4 5

. 1

To tal

70 6 21 Aq ue ous SP-2

FGD Clarifier

Effl uent 10/ 17/ 07 Dissol v ed 20 0. 7, 2 4 5

. 1

To tal 70 6 22 Aq ue ous SP-3

FG D E fflu e nt 10/ 17/ 07 Dissol v ed 20 0. 7, 2 4 5

. 1

To tal

70 6 23 Aq ue ous SP-4

Fly A s h Po nd

Effl uent 10/ 18/ 07 Dissol v ed 20 0. 7, 2 4 5

. 1

To tal

70 6 24 Aq ue ous SP-5

FG D E fflu e nt

Duplicate 10/ 17/ 07 Dissol v ed 20 0. 7, 2 4 5

. 1

To tal

70 6 27 Aq ue ous SP-8

FGD E ffluent Field

B l ank 10/ 17/ 07 Dissol v ed 20 0. 7, 2 4 5

. 1

To tal

70 6 28 Aq ue ous SP-9

Fly A s h Po nd

Effl uent Fi el d B l ank 10/ 18/ 07 Dissol v ed 20 0. 7, 2 4 5

. 1

NA = No t Ap plicab le

61 0 1 St e v en so n Ave n ue Alexa n d r ia, Vi rgi n ia 22 3 04

7 0 3

. 46 1.200 0 Fax 703 .4 61 .20 2 0

### These data ha ve been reviewed in accor d ance with CSC's Data Review Guidelines for Metals Analyses (Novem b er 2004); t h e EAD contract; and with the s p ecifi cations listed in EPA Methods 20 0

. 7 (Rev. 5.0)

. All data are o f acceptable q u ality with the qualifiers described below and detailed in the data review

su mmary table (Table 2).

SUMMARY

All sam p les were successful l y anal y zed within the method-specified holdi ng ti mes. The method detection

lim it (M DL) studies and initial precision and recovery (IPR) analy s es were perform ed and m e t the

contract-spec i fied criteria. Calibration curves, calibration standards

, and calibration blan ks were successfully a n aly zed. Preparation blanks perfor m ed f o r each analysis detected n o contam inati on above

the laborator y’s reportin g li mits. QC sam p les, in cluding o ngoi ng p r ecision and recovery (OP R ) sam p les, matrix spike (MS) sa m p les, matrix spike duplicate (MSD) sam p les, and laborator y serial diluti on sam ples

de m onstrated that laboratory perform an ce for these a n aly ses was a cceptable, wit h the exception of the

issues des c ribed below and su mmarized i n Table 2. The MS/MSD analy ses were performed on sa m p les

7062 2 and 70 623.

DATA ISSU ES

Method and Analytical Blanks

Several analy t es wer e dete cted in the preparation bl anks (PBs), ini tial calibration blanks (IC Bs), and continuing calibration blanks (CCBs) asso ciated with the sam p les i n this episode at concentrations greater than the respective MDLs, but less than t h e method- specified MLs. The data qualit y is affected as

follows:

• Sa m p le Re sults Great er than Five Tim es but Less than Ten Times Bl ank Results : CSC considers

these results t o be of acceptable quality

, but the y m a y be maxi m u m values. The result for total

calciu m in sam p le 70628 f a lls under thi s categor y

. T h is instance is detailed in Table 2.

• Sa m p le Re sults Great er than Ten Tim e s Blank Results or Analy t e Not Detect ed in Sam p le : CSC

does not cons ider the presence of the analy t e in th e bla nk to adversely affect the data in case s where the sa m p l e results a r e greater tha n ten tim es th e associ ated blank results or where the analy t e is not detected in as sociated sa mples. Several sa m p les f a ll into this category

, but because CSC considers such data to be acceptabl e without qua lification, the se cases do not m e rit furth e r detail.

Matrix Performance

MS/MSD and Serial Dilution anal y ses were perfor m ed on sam ples 70622 and 70623.

The percent recovery for t o tal seleniu m (138% ) in t h e MSD for sam p le 70622 was above the contractspecified criteria of 125% . CSC reco mmends that the result for total seleniu m in sam p le 70622 be considered of acceptable q u ality

, but m a y be a maxi mum value.

The serial dilution percent differences fo r several anal y t es were above the contract-specified criteria of

10%. These instances ar e as follows: tot a l titanium (1 3%) and zinc (100%) in sam pl e 70622; dissolved

antim ony (15%) in sam p le 70623; and t o tal alu m inum (28%) in sample 70623. I n these cases, MS/MSD percent recoveries w e re wi thin acceptable criteria. CS C reco mmen d s that the results for these analy t es be

included in the database without qualification.

23 

### Field Duplicates

The relative percent difference (RPD ) between the total zinc results for samples 70622 (FGD Effluent) and 70624 (FGD Effluent Duplicate) was 79%. CSC does not routinely qualify results based on field duplicate RPD.

Field Blanks

Several analytes were detected at concentrations above the contract-specified minimum levels. These

instances are summarized as follows:

• Boron and magnesium were detected in the dissolved FGD Effluent Field Blank sample 70627;

• Calcium was detected in the total FGD Effluent Field Blank sample 70627;

• Calcium was detected in the total Fly Ash Pond Effluent Field Blank sample 70628.

Per EPA request, CSC does not qualify sample results based on field blank results.

TECHNICAL NOTES

Minimum Levels

Due to severe matrix interferences, the laboratory an alyzed several samples at 50-fold dilutions for mercury. Total and dissolved mercury results for samples 70620, 70621, 70622, and 70624 were affected by this dilution. Reporting limits for these results have been adjusted accordingly.

If you have any questions regarding the analyses of these samples or the review of these data, please contact Barbara Beard by telephone at (703) 461-2154 , by facsimile at (703) 461-8056, or by email at

bbeard2@csc.com.

cc: Brian D’Amico, EPA Deb Bartram, ERG Beverly Randolph, EPA TJ Finseth, ERG Marla Smith, EPA Lynn Watlers, CSC Nelson Andrews, EPA Barbara Beard, CSC Brian Englert, EPA4 Table 2 Data Review Summary Table

Episode: 6550 Analysis: Metals

Industry: Steam Electric Study Reviewer: Lisa White

Sample Analyte Action Reason CSC Qual Level

70628 Total Ca Maximum Value Sample result >5x but

<10x blank result NA See Database

70622 Total Se Maximum Value MSD %R above contractspecified criteria NA See Database

NA= Not applicableComputer Sciences Corporation

www.csc.com

6101 Stevenson Avenue Alexandria, Virginia 22304

703.461.2000 Fax 703.461.2020 

### MEMORANDUM

DATE: December 20, 2007

TO: Ron Jordan, Work Assignment Manager

EPA EAD

FROM: Cris Robinson, Quality Assurance Chemist Computer Sciences Corporation

SUBJECT: Data Review Narrative for Trace Metals Analyses for the Steam Electric Study, Episode

6550

Under EPA contract number 68-C-03- 046, Battelle Marine Sciences submitted data for the analyses of trace metals. All nine aqueous samples in this epis ode were analyzed for total mercury (Hg) by Method 1631E and total metals including antimony (Sb), ar senic (As), cadmium (Cd), copper (Cu), chromium (Cr), lead (Pb), nickel (Ni), selenium (Se), silver (A g), thallium (Tl), and zinc (Zn) by Method 1638 (ICPMS). Seven of the nine (FGD and Fly Ash Pond Ef fluents; FGD Clarifier Effluent; FGD Effluent Duplicate; FGD Effluent, Fly Ash Pond Effluent, and FGD Clarifier Field Blanks) were analyzed for hexavalent chromium by Method 1636. Several samp les were analyzed for dissolved metals as well as total. Because FGD influent samples for this study were expected to be highly va riable in solids content, EPA chose to obtain results for this phase as well. The solid-phase results for sample 70620 were not directly analyzed, but rather calculated from total, dissolved, and TSS results.

Table 1 - Sample Identifiers, Descriptions , Sampling Dates, and Analysis Methods

EPA Sample

# Matrix Sample Description Sampling

Date Phase Methods

Total 1631E,

1638 10/17/07

Dissolved 1631E,

1638 70620 Aqueous SP-1 FGD Influent

NA Calculated

Solid 1631E,

1638

Total 1631E,

1638

Dissolved 1631E,

1638 70621 Aqueous SP-2 FGD Clarifier Effluent 10/17/07

NA 1636

Total 1631E,

1638

Dissolved 1631E,

1638 70622 Aqueous SP-3 FGD Effluent 10/17/07

NA 16362 Table 1 - Sample Identifiers, Descriptions , Sampling Dates, and Analysis Methods

EPA Sample

# Matrix Sample Description Sampling

Date Phase Methods

Total 1631E,

1638

Dissolved 1631E,

1638 70623 Aqueous SP-4 Fly Ash Pond Effluent 10/18/07

NA 1636

Total 1631E,

1638

Dissolved 1631E,

1638 70624 Aqueous SP-5 FGD Effluent Duplicate 10/17/07

NA 1636

Total 1631E,

1638 70625 Aqueous SP-6 FGD Influent Field Blank 10/17/07

Dissolved 1638

Total 1631E,

1638

Dissolved 1638 70626 Aqueous SP-7 FGD Clarifier Effluent Field

Blank 10/17/07

NA 1636

Total 1631E,

1638

Dissolved 1638 70627 Aqueous SP-8 FGD Effluent Field Blank 10/17/07

NA 1636

Total 1631E,

1638

Dissolved 1638 70628 Aqueous SP-9 Fly Ash Pond Effluent Field

Blank 10/18/07

NA 1636

NA = Not applicable



### These data have been reviewed in accordance with CSC's Data Review Guidelines for Metals Analyses (November 2004), with the EAD contract, and with the specifications listed in EPA Methods 1631E (Aug 2002), 1636 (Jan 1996), and 1638 (Jan 1996). All data are of acceptable quality with the qualifiers

described below and detailed in the da ta review summary table (Table 2).

SUMMARY

All nine samples were successfully analyzed with in the method-specified holding times, and initial precision and recovery (IPR) analyses and met hod detection limit (MDL) studies were acceptably performed. All QC samples, including ongoing precisi on and recovery samples (OPR), matrix spike and matrix spike duplicate (MS/MSD) samples, and qua lity control samples (QCS) were within method specified criteria, with the exceptions described be low. The MS/MSD analyses were performed on total and dissolved samples 70622 and 70623. Calibration cu rves and calibration verification standards were successfully analyzed, with the exceptions described below.3 

### All calibration and preparation blanks were free of contamination above the report limit (minimum level or ML), with the exceptions describ ed below. No analytes were detected at levels above the reporting limit in the field blanks, with the exceptions described below.

DATA ISSUES

Method and Analytical Blanks

Several analytes were detected in the preparation blanks (PB), initial calib ration blanks (ICBs), and continuing calibration blanks (CCBs) asso ciated with the samples in this episode at concentrations greater than the respective MDLs, but less than the method-sp ecified MLs. Antimony was detected in one ICB and zinc was detected in one CCB at levels marginal ly above their respective MLs. The data quality is

affected as follows:

• Sample Results Less than Five Times Blank Results : When the sample result is less than five times the blank result, there are no means by which to ascertain whether or not the presence of the analyte may be attributed to contamination. Therefore, CSC recommends that the data be reported in the database as a not detected at the ML, adjusted for sample size, dilution, and matrices. The affected samples and an alytes are as follows: 70622 total Sb.

• Sample Results Greater than Five Times but Less than Ten Times Blank Results : CSC considers these results to be of acceptable quality, but they may be maximum values. The affected samples and analytes are as follows: 70620 total Cr.

• Sample Results Greater than Ten Times Blank Results or Analyte Not Detected in Sample : CSC does not consider the presence of the analyte in th e blank to adversely affect the data in cases where the sample results are greater than ten times the associated blank results or where the analyte is not detected in associated samples. Because CSC considers such data to be acceptable without qualification, these cases do not merit further detail.

CCV

The recoveries of silver (108% and 109%) in two continuing calibration verification samples (CCV) were slightly above the method-specified upper limit of 107% . The affected results ar e as follows: total silver for samples 70620, 70621, 70622, and 70624; dissolved silver for samples 70621, 70622, and 70624. However, because silver was not detected in any of these associated samples, CSC recommends that the results be included in the database without qualification.

Field Blanks

CSC reviewed results from four field blanks. All fiel d blanks exhibited no results above the ML with the following exception: hexavalent chromium in sample 70626. Per EPA request, CSC does not qualify

results based on field blank contamination.

MS/MSD

The relative percent difference (RPD) for dissolved arsenic (22%) for the MS/MSD set performed on sample 70622 was marginally above the laboratory li mit (20%). Recoveries for both the MS and MSD were acceptable. CSC recommends that the dissolved arsenic result for the unspiked sample 70622 be considered of acceptable quality, but may be an estimated value.4 

### The RPD for total selenium (31%) for the MS/M SD set performed on sample 70622 was above the contract-specified limit (20%). Recoveries fo r both the MS and MSD were acceptable. CSC

recommends that the total selenium result for the un spiked sample 70622 be considered of acceptable quality, but may be an estimated value.

TECHNICAL NOTES

Sample Temperature

Trace metals samples were not chille d during shipment for this study.

Additional Analytes

Two additional analytes, arsenic and chromium, were included for evaluation by Method 1638. Because they are not specified in the method, the MLs for th ese (0.15 μg/L and 0.80 μg/L, respectively) were set well above the laboratory-determined MDL.

Minimum Levels

In order to alleviate interference caused by high leve ls of dissolved solids, the laboratory performed various dilutions on several samples on which Method 1636 and 1638 were performed. MLs are adjusted appropriately.

Solid-Phase Calculations

CSC calculated the solid-phase results using the following formula:

The results for the various phases will be labeled in the PROCEDUR field of the EPA database as “DISSOLVED”, “TOTAL”, and “CALCULATED SOLID (DRY WEIGHT)”.

When two results are mathematically combined to obtain a Calculated Solid result, CSC will report the larger of the two MLs associated with each result as the Calculated Solid ML.

In the generation of the Calculated Solid result, at EPA's request, CSC included Total and Dissolved concentrations that were greater than the MDL but l ess than the ML. However, if any concentration was affected by contamination in an associated blank at less than 5 times the associated blank result, it was changed to a zero before going through the calculation, per CSC's data review protocols. Negative values submitted by the laboratory were not used in the calculations.

The TSS result for the sample 70620 bottle analyzed for mercury is 7164 mg/L. The TSS result for the sample 70620 bottle analyzed for Method 1638 metals is 7150 mg/L. sample original Dissolved Total


### L mg TSS L ng Conc L ng Conc

/ ) /

. /

. ( μg/g) or (ng/mg ion concentrat phase Solid −

=5 

### If you have any questions regarding the analyses of these samples or the review of these data, please contact Barbara Beard by telephone at (703) 461-21 54, facsimile at (703) 461-8056, or via email at

bbeard2@csc.com.

cc: Brian Damico, EPA Deb Bartram, ERG Beverly Randolph, EPA TJ Finseth, ERG Marla Smith, EPA Lynn Walters, CSC Nelson Andrews, EPA Barbara Beard, CSC Brian Englert, EPA

Table 2 Data Review Summary Table

Episode: 6550 Analysis: Trace Metals

Industry: STELEC Study Reviewer: Cris Robinson

Sample Analyte Action Reason SCC Qual Level

70622 Total Sb Report in database

as non-detect Sample result <5x blank

result NA

70620 Total Cr Maximum value Sample result >5x and

<10x blank result NA

70622 Dissolved As

70622 Total Se Estimated value MS/MSD RPD above contract -specified criteria NA

70620 Calculated

Solid Cr Maximum value Associated total result is a

maximum NA See Database

NA = Not applicable

### Appendix D

PICTURES FROM THE SAMPLING EPISODE

### D-1 Figure D-1. Sampler Working Inside a “Cleanbox”

### D-2 Figure D-2. Sample Collection Set-Up at the Influent to FGD Wastewater Treatment System

### D-3 Figure D-3. Sample Tap and Tubing at the FGD Clarifier Effluent

### D-4 Figure D-4. Sample Collection Set-Up at the FGD Clarifier Effluent

### D-5 Figure D-5. Sample Collection Set-Up at the Effluent from FGD Wastewater Treatment System

### D-6 Figure D-6. Sample Collection Set-Up at the Effluent from the Fly Ash Pond