# FINAL Engineering Site Visit Report for Georgia Power’s Plant Wansley Roopville, GA

Prepared for:


## U.S. Environmental Protection Agency Engineering and Analysis Division Office of Water 1200 Pennsylvania Avenue Washington, DC 20004

Prepared by:


### Eastern Research Group, Inc. 14555 Avion Parkway Suite 200 Chantilly, VA 20151-1102

June 27, 2007

EPA Contract No. 68-C02-095 Work Assignment 4-22i TABLE OF CONTENTS
Page

1.0 S ITE V ISITED AND D ATE .......................................................................................... 1

2.0 A TTENDEES .............................................................................................................. 1

3.0 B ACKGROUND AND O BJECTIVES .............................................................................. 1

4.0 P LANT D ESCRIPTION ................................................................................................ 2

5.0 P LANT O PERATIONS ................................................................................................. 3 5.1 Coal Preparation .......................................................................................... 4 5.2 Boiler Operation .......................................................................................... 4 5.3 Selective Catalytic Reduction Operation .................................................... 5 5.4 Particulate Control ...................................................................................... 6 5.5 Biofouling Control ...................................................................................... 7 5.6 Metal Cleaning Operations ......................................................................... 7

6.0 W ASTEWATER M ANAGEMENT ................................................................................. 8 6.1 Coal Pile Runoff ......................................................................................... 8 6.2 Metal Cleaning Waste ................................................................................. 9 6.3 Low-Volume Waste .................................................................................. 11 6.4 Cooling Tower Blowdown........................................................................ 11 6.5 Ash Transport Water ................................................................................. 12 6.6 Final Effluent ............................................................................................ 12

7.0 R EFERENCES .......................................................................................................... 13
Appendix A LIST OF ATTENDEES Appendix B PICTURES FROM SITE VISIT Appendix C AMMONIA MONITORING DAT A PROVIDED BY PLANT WANSLEYii LIST OF TABLES
Page

A-1 List of Attendees................................................................................................. A-1
C-1 Plant Wansley Ammonia Data.............................................................................C-1iii LIST OF FIGURES
Page
6-1 Wastewater Flow Diag ram for Plant Wansley.......................................................10
B-1 Coal Pile at Plant Wansley...................................................................................B-1
B-2 Coal Pile Runoff Pond at Plant Wansley .............................................................B-1

B-3 Low-Volume Waste Basi n at Plant Wansley.......................................................B-2
B-4 Bottom and Fly Ash Sluice Water at Plant Wansley ...........................................B-2
B-5 Retention Pond at Plant Wansley.........................................................................B-3
B-6 Final Effluent Discharg e from Plant Wansley.....................................................B-31.0 S ITE V ISITED AND D ATE

Georgia Power’s Plant Wansley Liberty Church Road Roopville, GA 30170
December 11, 2006

2.0 A TTENDEES

Appendix A lists the attendees.

3.0 B ACKGROUND AND O BJECTIVES

Section 304(m) of the Clean Water Ac t (CWA) requires EPA to develop and publish a biennial plan that esta blishes a schedule for the annual review and revision of national effluent limitations guidelines and standards (E LGs) 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) is the second-largest discharger of toxic-weighted pollutants. EPA’s analyses indicated that the to xic-weighted loadings are predominantly driven by metals present in wastewater discharges, and that the wastestreams contributing the majority of the metals are associated with air pollution co ntrols. Other potential s ources of metals include coal pile runoff, metal/chemical cleaning wastes , coal washing, and certain low volume wastes.

In presenting the findings of the 2005/2006 study, EPA noted certain data limitations affect the Agency’s estimate of the potential hazard posed by discharges from this category and, therefore, EPA determined that fu rther review of these discharges during the 2007/2008 ELG planning cycle is warra nted. Due to the limited resources and time available for conducting this study, EPA is concentrating its efforts for the 2007/2008 study on better characterizing pollutant sources and available pollution control t echnologies/practices for the pollutants responsible for the majority of the toxic-weighted pollutant loadings from steam
electric facilities. This will focus the review on wastewater discharges from coal-fired power plants.

1EPA intends to review overall plant ope rations and better un derstand the various wastewater sources present at steam electric plants . This review is expected to largely focus on ash handling wastes, wet flue gas desulfurizati on (FGD) wastes, coal p ile runoff, and final
effluent.

EPA and its contractor, Eastern Resear ch Group, Inc. (ERG), conducted a site visit to Georgia Power’s Plant Wansley on Dece mber 11, 2006. The purpose of the visit was to: 1) gather information about the wastewater management practices used to control discharges from the plant; and 2) determine the feasibility of collecting and analyzing wastewater samples from steam electric power plants.

4.0 P LANT D ESCRIPTION

Georgia Power’s Plant Wansley bega n operation in December 1976, when Unit 1, a coal-fired boiler, came on line. Unit 2, which al so has a coal-fired boiler, began commercial operation in April 1978. In 1980, the plant adde d Unit 5, which is an oil-fired combustion turbine. Units 6, 7, 8, and 9 are natural-gas fi red combustion turbines with combined cycle operations and were installed between 2002 and 2004. When Unit 5 came on-line, Plant Wansley intentionally did not name it “Unit 3” because it was planning on using “Unit 3” and
“Unit 4” for two additional coal-fired units to be built later; however, the plant has yet to build
these additional coal-fired units.

Plant Wansley is a jointly-owned plan t in which various units are owned by various entities; however, Georgia Power is the pr imary operator and holder of all plant permits. Units 1, 2, and 5 are owned by Georgia Power, Un its 6 and 7 are owned by Southern Power, Unit 8 is owned by Oglethorpe Power Corporation (OPC ), and Unit 9 is owned by Municipal Electric Authority of Georgia (MEAG). Plant Wansley has a total of seven ge nerating units with a combined total capacity of approximately 4,000 megawatts (WM). Units 1 and 2 are the only coal-fired units; however, the two units account for approxima tely 1,700 MW, or 40 percent of the plant’s capacity. Plant Wansley is loca ted on approximately 5,200 acres of land in both Heard and Carroll Counties, along the Chattahooch ee River. The plant employs approximately 230 people.

2In 2003, Plant Wansley retrofitted Units 1 and 2 with SCR systems to control the nitrogen oxide releases from the plant. Curre ntly, Plant Wansley is re trofitting Units 1 and 2 with flue gas desulfurization (FGD) scrubbers to control sulfur dioxi de releases from the plant. The FGD systems are expected to be opera tional in 2008 and 2009, and will be Chiyoda JetBubbling Reactor® FGD systems, similar to the FGD system operated at Georgia Power’s Plant Yates, located in Newnan, GA and visited by EPA on December 11, 2006. 1 However, the FGD systems at Plant Wansley will be larger in scal e compared to the Plant Yates system. For a description of how the Jet-B ubbling Reactor® FGD system opera tes, see Section 5.6 of the Engineering Site Visit Report for Georgia Power’s Plant Yates . Plant Wansley expects to manage the FGD wastewaters with a “gypsum st acking” operation, similar to the operation at Plant Yates (see Section 6.0 of the Engineering Site Visit Report for Georgia Power’s Plant
Yates for more details on “gypsum stacking”). Ho wever, Plant Wansley expects to transfer the gypsum pond effluent to the ash ponds.

5 .0 P LANT O PERATIONS

Plant Wansley uses approximately 14,000 tons of coal per day to generate electricity in units 1 and 2. The coal-fired units account for most of the wastewater discharges from the plant, approximately 66,000 gpm of 85,000 gpm (95 of 122 MGD) total (75% percent) 2 . Unit 5, the oil-fired, simple cycle unit, ha s no wastewater associated with the unit. Units 6-9, the natural gas, combined cycle un its, only have cooling to wer blowdown, low volum waste, and metal cleaning dis e charges.

Plant Wansley has its own water treatment plant on site producing demineralized water for boiler makeup. The plant sends the wastewaters generated by the water treatment plant, such as filter backwash wa ter, to the low-volume waste ba sin, described in Section 6.3. In addition, the plant has a service water pond which is used as the intake for the plant’s process operations. The service pond is supplied with wa ter from the Chattahoochee River. The water from the pond is screened for trash and chlorina ted five days per week for one hour each day.

1 See Engineering Site Visit Report for Georgia Power’s Plant Yates , dated June 27, 2007. 2 Based on values provided in Figure 6-1, which are maximum flow values. 3The Plant Wansley site visit focused on the coal-fired units and the wastewaters associated with these units. EPA and ERG did briefly observe the combined cycle units; however, they are not discussed in this site visit report. For a general description of the steam electric power generation process and the co mbined cycle process, see Section 3.2 of the Interim Detailed Study Report for the Steam Electri c Power Generating Point Source Category . The
remainder of Section 5 describes the fo llowing six operations at Plant Wansley:

y Coal preparation;

y Boiler operation;

y Selective catalytic reduction (SCR) operation;

y Particulate control (inclu des wet fly ash handling);

y Biofouling control; and

y Me tal cleaning operations.

5.1 Coal Preparation

Plant Wansley burns eastern bituminous co als from the Central Appalachia coal region in Units 1 and 2. The coal is deliver ed by 100-car trains ca rrying approximately 10,000 tons of coal. The plant automatically unloads the coal from the trains and conveyor belts transport the coal to the coal storage pile, whic h contains about a 32-day supply of coal for the plant, approximately 450,000 tons. St orm water runoff that contacts the coal pile is collected in one of two coal pile runoff ponds.

The coal that is delivered to the plant is coarsely crushed by the mine prior to delivery to the plant. Plant Wansley crushes the coal further as it is tr ansported from the coal pile to the storage bunkers. Finall y, prior to the coal entering th e boiler, the plant pulverizes the coal into a finely ground powder that is blown into the boiler using air.

5.2 Boiler Operation

As the pulverized coal is blown into the bo iler, it is combusted and gives off heat. The heat produced in the boiler is used to convert water into high-pressure st eam. As the coal is combusted, solid, non-combustible constituents of the coal, referred to as ash, are generated. The heavy ash particles that collect on the bottom of the boiler are referred to as bottom ash. The

4finer particles that are light enough to be transfer red out of the boiler with the flue gas exhaust are referred to as fly ash. At Plant Wansley, a continuous stream of sl uice water collects and removes the bottom ash and other slag from the bottom of the boiler. The fly ash is also sluiced from the electrostatic precipitator (ESP), which removes fly ash from the gas and is described more fully in Section 5.4. Wastewater is also oc casionally generated as the plant washes the fireside and water-side of the boile r. These wastewaters are discussed in Sections 5.6 and 6.2.

5.3 Selective Catalytic Reduction Operation

During the coal combustion that occurs in the boiler, the nitrogen in the air reacts with the oxygen at the elevated temper atures to produce nitrogen oxides (NO x ). SCR is a widely used practice for the removal of n itrogen oxide from flue gases. For a general description of the SCR process, see Section 3.2.1.6 of the Interim Detailed Study Report for the Steam Electric Power Generating Point Source Category

.

The SCR units at Plant Wansley are located downstream of the boilers and upstream of the air preheater a nd the ESPs on Units 1 and 2. The SCRs, operate with three layers of a catalyst grid, compos ed of vanadium pentoxide in a ceramic matrix. However, there is room in each unit for one additional layer of catalyst, if it becomes necessary for additional
NO x removal. Ammonia is injected into the flue gas as part of the SCR process. The ammonia feed to the SCR is determined by measuring the NO x content in the SCR outlet gas and feeding enough anhydrous ammonia to bring the NO x content to a setpoint valu e, which is determined by the plant’s Title V permit. Excess unreacted ammonia from the SCR system is known as “ammonia slip.” The ammonia slip from the pr ocess is primarily in a gaseous phase until it reaches the preheater, which cools the flue gas and condenses the ammonia. This unreacted ammonia collects on the ash and on preheater surf aces. The plant can monitor for ammonia slip by analyzing the dry ash removed from the ESPs. According to the plant, a low-sulfur coal produces ash that has less affinity for ammonia. Ammonia slip is a loss of raw material, which is not economically efficient; therefore, the plant attempts to minimize ammonia slip during the operation of the system. In addition, ammonia slip can cause plugging in the air preheater downstream of the SCR system. Acco rding to the plant, if ammonia slip begins to occur, it may be a sign that the catalysts are running out of life and may need to be replaced.

5There are no direct wastewater discharges associated with th e SCR process at the plant; however, the process can affect the fly as h sluice water discharges. For example, if ammonia slip does occur in the system it is trans ported with the fly ash and sluice water to the ash pond and ultimately discharged from the plant. Representatives of the plant stated that, since the installation of the SCR in 2003, there has no t been a significant in crease in the ammonia discharges from the final effluent, based on the m onitoring data required by the plant’s permit. The plant averaged an ammoni a concentration of 0.3 mg/L in 2002 and 2003, and the plant’s average ammonia concentration decreased to 0.2 mg/L in 2004. In 2005, every measurement for
ammonia at the final effluent was non-detect . Table C-1, in Appendix C, presents Plant Wansley’s ammonia monitoring data from the final outfall from January 2002 through April 2007. The plant did not have a permit limit for a mmonia prior to the inst allation of the SCR.

5.4 Particulate Control

As described in Section 5.2, ash is gene rated during the coal combustion process and fly ash is transported out of the boiler with th e flue gas. Plant Wansley has ESPs to remove the fly ash from the flue gas. The ESP, which is downstream of the SCR and the air preheater, uses a high voltage to generate an electric charge on the particles contained in the flue gas. The charged particles then collect on a metal plate wi th an opposite electric char ge. As the particles begin to layer on the metal plates, the plates are tapped/rapped to loosen th e particles, which fall into a collection hopper. The ESPs achieve a 99 percent removal of th e fly ash from the flue gas.

Plant Wansley is capable of handling the fly ash collected from the ESP in a dry or wet manner, but typically hand les it in a wet manner. The plan t handles the fly ash in a wet
manner because it is their most economical means for transportation to ash pond for disposal. If
there is a contract for the sale of ash for benefi cial use the plant would handle the fly ash dry at the request of the purchasers. The fly ash bei ng sold by Plant Wansley is most commonly used as an additive in concrete, if it is beneficially reused. While operating the wet fly ash system, a
continuous flow of sluice water collects th e fly ash from the ES P collection hopper and transports it to the ash pond.

65.5 Biofouling Control

Plant Wansley uses chlorine for biofouling control of each of the six cooling tower systems. When the plant adds chlorine to the cooling water for biofouling control, the plant also isolates (shuts down) its cooling sy stem blowdown until the chlorine has dissipated in the system. The plant ty pically waits 12 hours after the chlori ne has been applied and the total residual chlorine (TRC) concentration is less th an the detection limit, which is verified by the plant before discharging the cool ing water blowdown from the sy stem. The cooling towers for the combined cycle units often dechlorinate their cooling water with sodium bisulfite in order to
accelerate the blowdown of their towers. Each of the cooling towers recei ves chlorine biofouling control approximately every ot her day throughout the year.

5.6 Metal Cleaning Operations

Plant Wansley has routine outages during the year to perfor m maintenance on the process equipment. In addition to performing maintenance to ensure the proper operation of the equipment, the plant also cleans the equipment.

During routine outages, the plant cleans the fire side of the boilers. This consists of spraying the inside of the boiler with a high -pressure stream of water, which removes the deposits that have built up on th e boiler tubes and the walls of th e boiler. The wastewater from this cleaning process is transf erred directly to the ash pond.

In addition to cleaning the fire side of the boilers, the plant also cleans the water
side of the boilers. This chemical cleaning process, which cleans th e inside of the boiler tubes, is conducted every 10 to 15 years. The plant typica lly circulates an inhibited hydroxyacetic/formic acid through the boiler tu bes to remove scale. The wastewater generated from this cleaning process is not hazardous and is transferred to a separate chemical cleaning waste basin for settling. The wastewater may be settled for a few hours or many days before it is pumped to the ash pond after meeting limits of 1.0 mg/L for copper and iron. It is ultimately discharged from the ash pond. Occasionally Plant Wansley discharg es metal cleaning wastes directly to the ash

7pond based on an approved internal procedure wh ich requires monitoring of the ash transport
blowdown to demonstrate that the limits are met.

Both of these cleaning operations are pe rformed on all coal-fir ed boilers and the natural gas, combined-cycle units. In addition to these cleaning operations, the plant also cleans the combustion turbines from the combined cycle units. This is a chemical cleaning process and the wastewater is hauled off site, due to issues in discharging detergents and metals to surface

water.

Plant Wansley also generates an intermittent waste stream from the cleaning of the cooling tower basin. The wast ewater generated from this cl eaning operation is sent to the low-volume waste basin, described in Section 6.3.

6 .0 W ASTEWATER M ANAGEMENT

Plant Wansley generates several different types of wastewater from the operation of the coal-fired units; howeve r, the plant combines all of these wastewaters along with wastewaters from the combined cycle units into the ash pond for low-volum e wastes and/or the retention pond for cooling tower blowdown prior to discharge. Figure 6-1 presents the wastewater flow diagram for Plant Wansley. Each of these wastewaters and their treatment are
described in this section of th e report, including the following:

y Coal pile runoff;

y Metal cleaning waste;

y Low-volume wastes;

y Cooling tower blowdown;

y FGD system wastewater;

y Ash transport water; and

y Fi nal effluent.

6.1 Coal Pile Runoff

As mentioned in Section 5.1, the coal pile contains approximately 450,000 tons of coal maximum at any given time. Figure B-1, in Appendix B, presents a picture of part of the coal pile. As rain falls on the coal pile, th e runoff from the area becomes contaminated with
89 pollutants that are found in the co al. This contaminated wastewat er is collected in one of two coal pile runoff ponds, each located on either side of the coal pile area (shown in Figure 6-1 as
the “West CP Runoff Pond” and “East CP Runoff Pond.” Figure B-2, in Appendix B, presents a picture of one of these coal pile runoff ponds. Th e coal pile runoff is a llowed to settle and is generally held in these ponds. If an overflow level is reached in the ponds due to rainfall or wash-down from coal handling equipment, the wast ewater is automatically discharged to the ash pond. Each of the runoff ponds is approximately one and a half acres and can accommodate a
six-inch rainfall event in a 24-hour period. The drainage ar ea to the ponds is approximately 48.2 acres. Plant Wansley does not treat the wast ewater prior to sendi ng it to the ash ponds.

6.2 Metal Cleaning Waste

Plant Wansley has several intermittent cleaning operations that generate wastewater. These cleaning ope rations, described in Section 5.6, are completed during plant outages, and the wastewaters from the differe nt operations are handled differently.

The wastewater generated from the fire side cleaning of th e boilers is not a chemical cleaning waste. This wastewater contai ns scale and deposits from the boiler. The plant transports this wastewater directly to the ash pond.

The wastewater generated from the water side of the boilers is a chemical cleaning process and therefore, n eeds to be handled specially. The plant only generates this wastewater approximately every 10 or 15 years. The wastewater generated from the cleaning operation is transported to a sepa rate waste basin and allowed to settle. This wastewater is discharged to the ash pond as discussed in Section 5.6.

The wastewater generated from cleaning the combustion turbines is a chemical cleaning process and the plant has the wastewater hauled off site for disposal. According to Plant Wansley, it is more economical to pay a vendor to dispose of the waste off site than to treat the wastewater to meet the effluent guide line limits of 1.0 ppm for copper and iron.10GEORGIA POWER COMPANYPLANT WANSLEYNPDES PERMIT NO. GA 0026778Flow wan.ppt 11/11/03CHATTAHOOCHEE RIVERALL FLOWS ARE MAXIMUMCombined CycleUnits 6, 7, 8, 9Plant WansleyUnits 1 & 2CoalPileService Water Storage PondAsh PondWest CPRunoffPondEast CPRunoffPond02D CoalHandling STP3 gpm04 Car WashRet. Pond

Retention Pond

01K Cool Twr Blowdown U-9 2,000 gpm 01H Cool Twr Blowdown U-6 2,000 gpm

01I Cool Twr Blowdown U-7 2,000 gpm

01J Cool Twr Blowdown U-8 700 gpm

02J Low Vol Waste Unit 9 900 gpm02K Alternate Unit 9 LVW01F DrainageCanal Discharge7,780 gpm01C Ash TransportWater Blowdown30,000 gpmWasteWaterBasin02H Service BldgSTP 7 gpmCooling TowersUnit 1Cooling TowersUnit 2

03B Ash Pond Emergency Overflow (North)

03A Ash Pond Emergency Overflow (South) 0 2 I L o w Vo l W a s t e U n i t s 6 , 7 , 8 3 , 8 0 0 g p m01D ConstructionSTP 8 gpm

Ash Transport Water Recycle 02C 1000 gpm 0 2 B 1 , 0 0 0 g p m02 Ash Transport Water 25,800 gpm01E RetentionPond Drain01 Final Discharge85,488 gpm02E MetalCleaningWaste

01G Service Water Sump Overflow 11,000 gpmLVW02A Low Volume Waste 7,000 gpm02G CT Basin waste02F CT Basin waste01A Blowdown/overflow 15,000 gpm01B Blowdown/overflow 15,000 gpm05 IntakeSump150 gpm06 Svc Water PumpSeal Water & StrainerBackwash 1,500 gpmFigure 6-1. Wastewater Flow Diagram for Plant WansleyLastly, the wastewater gene rated from the cleaning of th e cooling tower basins is not a chemical cleaning waste. Cooling tower ba sin cleaning wastes is a defined category of low-volume wastes and may be combined with any other low-volume waste stream prior to monitoring and discharge. Plan t Wansley’s liquid cooling tower cleaning wastes are pumped to the Low-Volume Waste basin and subsequently to the ash pond. The solid residual sludge is trucked directly to the ash pond.

6.3 Low-Volume Waste

Plant Wansley has a low-volume waste ba sin (shown in Figure 6-1 as “Waste Water Basin”) that collects all of the low-vol ume and non-chemical metal cleaning wastes from
the coal-fired units and other sources within the plant. Figure B-3, in Appendix B, presents a picture of the low-volume waste basin. The serv ice water used as once-through cooling for some small process heat exchangers contributes the most water to the low-volume waste basin. The other low-volume wastes from the plant include building sump water, sanitary wastewater, and water treatment plant wastewater (not shown in Figure 6-1). The low-volume waste collected in the basin is pumped to the ash pond. The discha rge from the low-volume waste basin to the ash pond is automatically level-switch controlled. Four pumps are capable of pumping up to a maximum of 7,000 gpm. The influent to the low-volume waste basin is highly variable depending on operations and maintenance activ ities. In general, one pump is operates continuously, with additional pumping added as the le vel in the basin rises. The long term flow rate form the basin averages about 3,000 gpm. The low-volume wastes that are generated from the combined cycle units are sent to the low-volume waste basins that serve th at area of the site.

6.4 Cooling Tower Blowdown

Each of the coal-fired and combined cycle units at Plant Wansley has a recirculating cooling system. As mentioned in Section 5.5, the plan t uses chlorine for biofouling control and isolates its cooling system blowdow n until the TRC concentration is less than the
detection limit. Once the TRC concentration is ve rified to be less than the detection limit, the plant opens the cooling system blowdown and th e blowdown discharges are transferred to the retention pond. The plant discharges cooli ng tower blowdown periodically, and does not

11discharge when the plant is chlorinating for bi ofouling control. There are no specific water quality requirements for the make-up wa ter used in the cooling tower.

6.5 Ash Transport Water

The ash pond at Plant Wansley receives ma ny different types of wastewater from the plant; however, most of the wastewater sent to the ash pond is from the fly and bottom ash handling systems. The plant sluices the fly ash from the ESP collection hoppers and the bottom
ash from the bottom of the boiler. Ash sluice water flows from the fly ash hoppers and bottom ash hoppers to an ash lift station where the as h-laden sluice water is pumped through piping to the ash pond. There are no speci fic water quality requirements fo r water used as ash sluice water. The plant typically uses the recycled ash pond water for th e ash sluice water. Figure B-4 presents a picture of the fly and bottom ash slui ce water being transported to the ash pond.

As the ash transport water and the ot her low-volume wastewaters flow through the ash pond, the fly ash and other particulates se ttle to the bottom of the pond. At the opposite end from the influent of the ash pond, the ash tr ansport water is gravity fed out of the pond and most of the wastewater is recycled within th e plant’s process operations ; however, some of the ash transport water is bled off (i.e., the ash trans port blowdown) to a drainage canal that flows to a retention pond (described in Section 6.6) and is ultimately discharged to the Chattahoochee River. The average ash transpor t recycle flow rate is about 17,000 gpm, with an average ash transport blowdown flow rate of 6,000 gpm. The ash pond blowdown to the retention pond is used to keep the ash pond at a constant level.

6.6 Final Effluent

Plant Wansley collects all of its wastewat er in a retention pond prior to discharge
to the Chattahoochee River. The retention pond combines the wastewater from the ash pond, which includes fly and bottom ash sluice, coal pile runoff, low-volume wastes, and some nonchemical metal cleaning wastes, and the cooling to wer blowdown from each of the coal-fired and combined cycle units. All storm water discharges are also collected in the retention pond. The retention pond has a residence time of less than 24 hours. Booms are located in the retention

1213 pond to prevent the discharge of floating solids to the Chattahoochee River. Figures B-5 and B6, in Appendix B, are pictures of the retention po nd and Plant Wansley’s fina l effluent discharge, respectively. The plant monitors the effluent discharge twice per month for pH and ammonia; however, other parameters such as TRC and tota l suspended solids are monitored on individual wastestreams prior to commingling in the retention pond.

7. 0 R EFERENCES

1

. U.S. EPA. 2006. Interim Detailed Study Report for the Steam Electric Power Generating Point Source Category . EPA-821-R-01-015. Washington, DC. November. DCN 01923.
2. Georgia Power. 2003. Plant Wansley . GP0302204-8/03. August. Available online at: http://www.southerncompany.com/gapower/about/pdf/ Plant%20Wansley%20brochure.pdf

. 3. Southern Company R&EA. 2006. FGD a nd SCR – An Overview. December 11.Appendix A

LIST OF ATTENDEESA-1Table A-1. List of AttendeesNameOrganization (Representing)TelephoneE-mailDonna HillSouthern Company(205) 257 5234dbhill@southernco.comNick IrvinSouthern CompanyRussel NobleSouthern CompanyBill EvansGeorgia PowerStanley GilesGeorgia PowerScott MayoGeorgia PowerRandy PurserGeorgia PowerLindy JohnsonTennessee Valley Authority(423) 751 3361lpjohnson@tva.govPaul ChuElectric Power Research Institute(650) 855-2812PCHU@epri.comLiz AldridgeHunton & Williams(804) 788 8549ealdridge@hunton.comKristy BulleitHunton & Williams(202) 955 1547kbulleit@hunton.comJosh HallEPA/Office of Water(202) 566 1002hall.josh@epa.govRon JordanEPA/Office of Water(202) 566 1003jordan.ronald@epa.govKarrie-Jo Robinson-ShellEPA/Region 4(404) 562 9308shell.karrie-jo@epa.govLeslie ChurillaERG (Contractor to EPA)(404) 634 0038leslie.churilla@erg.comT.J. FinsethERG (Contractor to EPA)(703) 633 1698thomas.finseth@erg.comAppendix B

PICTURES FROM SITE VISITFigure B-1. Coal Pile at Plant Wansley

Figure B-2. Coal Pile Runoff Pond at Plant Wansley

B-1Figure B-3. Low-Volume Waste Basin at Plant Wansley

Figure B-4. Bottom and Fly Ash Sluice Water at Plant Wansley

B-2B-3 Figure B-5. Retention Pond at Plant Wansley

Figure B-6. Final Effluent Di scharge from Plant WansleyAppendix C

AMMONIA MONITORING DATA PR OVIDED BY PLANT WANSLEYTable C-1. Plant Wansley Ammonia Data
Final Plant Discharge NPDES Monitoring – January 2002 to Present (SCR operating)

Month 2002 2003 2004 2005 2006 2007 Units Jan 0.1 0.1 0.0 0.1 0.0 mg/L 0.4 0.2 0.1 0.0 0.0 0.0 mg/L Feb 0.2 0.8 0.0 0.0 0.0 0.0 mg/L 0.2 0.2 0.0 0.0 0.1 0.0 mg/L Mar 0.2 0.3 0.0 0.0 0.0 0.1 mg/L 0.3 0.1 0.0 0.0 0.0 0.0 mg/L Apr 0.2 0.1 0.2 0.0 0.0 0.1 mg/L 0.2 0.2 0.1 0.0 0.1 0.1 mg/L May 0.2 0.3 0.0 0.0 0.2 mg/L 0.4 1.8 0.2 0.0 0.1 mg/L June 0.5 0.1 0.0 0.0 0.0 mg/L 0.1 0.2 2.0 0.0 0.0 mg/L July 0.0 0.1 0.0 0.0 0.0 mg/L 3.1 0.0 0.2 0.0 0.0 mg/L Aug 0.3 0.1 0.1 0.0 0.1 mg/L 0.1 0.3 0.0 0.0 0.1 mg/L Sep 0.2 0.2 0.1 0.0 0.1 mg/L 0.1 0.2 0.0 0.0 0.0 mg/L Oct 0.0 0.4 0.2 0.0 0.1 mg/L 0.0 0.2 1.0 0.0 0.2 mg/L Nov 0.7 0.0 0.1 0.0 0.1 mg/L 0.1 0.0 0.0 0.0 0.1 mg/L Dec 0.1 0.3 0.2 0.0 0.1 mg/L 0.1 0.0 0.0 0.0 0.0 mg/L

Max 3.1 1.8 2.0 0.0 0.2 0.1 mg/L Avg 0.3 0.3 0.2 0.0 0.1 0.0 mg/L

C-1