A SCANA COMPANY



### August 9, 2010

Eleanor Ku Codding, P .E. Eastern Research Group, Inc. 14555 Avion Parkway, Suite 200 Chantilly, VA 20151-1102 James M. Landreth Vice President Fossil Hydro Operations



### Re: Clean Water Act Section 308 and Resource Conservation and Recovery Act Section 3007 Response to Information Request

Dear Ms. Codding:

This document is prepared in response to the letter from Mr. Mark Pollins to Mr. Gary Williams, Plant Manager, Wateree Station, 142 Wateree Station Road, Eastover, South Carolina, Re: Clean Water Act Section 308 and Resource Conservation and Recovery Act Section 3007 Information Request, received by SCE&G on June 10,2010.

Enclosed you will find my signed certification and responses to questions set forth in the information request. Sincerely,

# t~r:::~

Enclosure

C: Mr. Stephen A. Byrne, Executive Vice President Generation, Nuclear and Fossil Hydro Plant Manager, Wateree Station

100 SCANA Parkway • Cayce, SC • P (803) 217-7224 • F (803) 933-8241 • jlandreth@scana.com Mailing Address 220 Operation Way • MC A221 • Cayce, SC • 29033-3701

## I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, I 

## certify that the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am 

## aware that there are significant penalties for submitting false information, including the possibility of fine and impriso ent for knowing violations.
Signature:
Name: 

## Title:
Date:EPA Information Request for Wateree Station



### 1. Identify the name, address, telephone number, and location of the current legal owner(s) and operator(s) of South Carolina Electric and Gas, Wateree Station, as well as, the name, address, telephone number, and location of its parent company.

Wateree Station is owned and operated by the South Carolina Electric and Gas Company, a wholly owned subsidiary of:

SCANA Corporation 100 SCANA Parkway Cayce, SC 29033-3712 803-217-9000



### 2. On a topographic map, using the most recent USGS 7 

### Y2 minute or 15 minute topographic quadrangle map, show the location of the facility boundaries, as well as all surface water flows, including tributaries, streams, rivers, Jakes, ponds, and wetlands, within the facility boundaries that cross into or are adjacent to the facility boundaries.

See attached maps entitled Wateree facilities- USGS.pdf and sceg00110-basemap-Site Map. pdf.



### 3. List and label each area located at the facility that the company uses or has used to collect, store, treat, or dispose of fly ash, bottom ash, slag, combined fly ash and bottom ash, flue gas desu/furization sludge, co-disposed and co-managed ash and coal refuse, solid waste, hazardous waste, as well as wastewater, including process wastewater, waste slurry or sludge, cooling water, storm water runoff, and sanitary wastewater, on an episodic or routine basis ("management areas"). For each of these areas, describe its function in managing waste or wastewater. Management areas include, but are not limited to, underground mines, underground injection wells, landfills, tanks, ponds, lagoons, basins, storm drains, pipes, and surface impoundments.

See attached maps entitled Wateree facilities- USGS. pdf and sceg00110-basemap-Site Map. pdf. They include the following areas:

a. #1 ash pond b. #2 ash pond

c. Landfill d. Landfill runoff pond
e. FGD blowdown pond f. Holding pond g. Holding pond h. Metal cleaning waste basin 

### i. Coal pile runoff pond Response to EPA Information Request Wateree Station



### 1j. Gypsum temporary storage pad k. Groundwater monitoring wells I. Stormwater runoff pond
m. Fly ash silos
n. Hazardous waste storage
(a) #1 Ash Pond- Receives sluice bottom ash and fly ash, which is reclaimed for beneficial off-site

reuse. This pond also receives plant wastewater and stormwater that includes the following: stormwater collected in two holding ponds that flows to the Coal Pile Runoff (CPR) Pond and is then pumped to the #1 Ash Pond, the closed cycle cooling tower blowdown, the ammonia tank farm sump, the boiler sumps, the water treatment sump, the FGD blowdown pond, the landfill runoff pond, and the ash sluice wastewaters. The wastewater and stormwater is collected and then discharged to the #1 Ash Pond.
(b) #2 Ash Pond- Receives some residual transfer of sluice bottom ash and fly ash, which can be reclaimed for beneficial off-site reuse. This pond receives all of the plant wastewater and stormwater from the #1 Ash Pond. The water in this pond can further settle and is chemically treated for pH, if necessary prior to discharging from outfall 03A to the Wateree River. The series of ponds that make up the site wastewater treatment system are designed such that all wastewater discharged to the Wateree River meets the applicable state water quality standards, the applicable Federal Effluent Limitations Guidelines established by EPA for Steam and Electric Generating facilities, and the associated discharge limitations of permit SC0002038.
(c) Landfill- Receives gypsum which is a byproduct of our FGD Scrubber. The landfill is also permitted to receive coal ash waste materials (fly ash and bottom ash) resulting from the electric power gen·eration processes. The drainage system in the landfill routes the leachate and stormwater runoff to the landfill runoff/leachate pond that is in the southeast corner of the landfill area.
(d) Landfill Runoff/Leachate Pond -Is a sedimentation pond that receives residual transfer of gypsum
as well as leachate and stormwater from the landfill. The gypsum solids that have accumulated and settled in the fore bay of the pond will periodically be removed and placed in the onsite landfill. The leachate and stormwater in the landfill runoff/leachate pond is then pumped to the #1 Ash Pond.
(e) FGD Blowdown Pond- Receives gypsum and blowdown water from the FGD Scrubber as well as stormwater. The primary and secondary hydroclones from the FGD Scrubber are designed to remove the majority of the gypsum solids and recycle them back into the scrubber process. The remaining blowdown water containing gypsum solids are transferred to the FGD Blowdown Pond by a series of pumps to allow the gypsum solids to settle within the pond. The gypsum solids that have accumulated and settled in the pond will periodically be removed and placed in the onsite landfill. The scrubber blowdown water and stormwater from the pond is pumped to the #1 Ash Pond.

Response to EPA Information Request Wateree Station



### 2**-----------------------~--** -

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## --------

(f) Holding Pond- This pond and the other holding pond listed below are actually one pond that had been separated into two ponds. These ponds are used to collect stormwater runoff which is routed to the coal pile runoff pond.
(g) Holding Pond- See above.

(h) Metal Cleaning Waste Basin- Wateree Unit 2 was chemically cleaned by Hydrochem Industrial Services on 12/6-12/8/2006. This was the first cleaning since the unit was converted to oxygenated water treatment in 1998. An analysis of the composite drain indicated that 2,752 pounds of iron and 23 pounds of silica were removed. Wateree Unit 1 was chemically cleaned by Hydrochem Industrial Services on 5/13/07. This was the first cleaning since 1997. Analysis ofthe composite drained indicated that 2,944 pounds of iron, 26 pounds of manganese, 24 pounds of chromium, 17 pounds of aluminum and 4 pounds of zinc were removed. All the boiler's cleaning solutions were drained to the metal cleaning waste pond. Between cleanings, this pond is dry.

(i) Coal Pile Runoff Pond- This pond is used to collect stormwater runoff from the coal pile, as well as, process water from the coal handling fueling station. It contains coal fines transported from the coal pile. This pond is pumped to the #1 ash pond.



## Ul Gypsum Temporary Storage Pad- Receives gypsum from the FGD Scrubber process by the gypsum stackout conveyor. Gypsum accumulates on the storage pad until it is transported by dump trucks to the onsite landfill. The storm water from the storage pad is routed into a sump which is then pumped back into the FGD process. A ditch that includes several rock checks is located north of the storage pad, which receives the stormwater from the access road into and out of the storage pad area. This ditch is then routed to the north ditch ofthe coal pile, which drains to the Coal Pile Runoff Pond and is then pumped to the #1 Ash Pond.
(k) Groundwater Monitoring Wells- See the response to question #2 for locations. These wells are part of our NPDES permit requirements.
(I) Stormwater Runoff Pond (Landfill)- Receives the stormwater from the landfill perimeter area. The stormwater from the runoff pond is discharged through a weir to a ditch east of the runoff pond and south ofthe Landfill Runoff Pond.
(m) Fly ash silos- These silos are used to store fly ash prior to transport to the Carbon Burn Out (CBO) facility or pick up by cement manufacturers. After processing in the CBO facility ash is stored in silos for pick up by cement manufacturers.
(n) Hazardous Waste Storage- This is a diked, covered, and locked concrete area for temporary storage of hazardous waste prior to pick up and disposal by licensed transporters/facilities.

Response to EPA Information Request Wateree Station



### 3

### 4. For each management area, identify its location and boundaries on the map provided in response to question #2.

See attached map documents (Wateree facilities- USGS. pdf and scegOOllO-basemap-Site Map. pdf)

. 

## .5. For each management area, describe the area's approximate storage capacity, the volume of
waste or wastewater currently stored, and the approximate proportion of free liquid and settled solids within the stored wastewater. Explain how the company calculated these volumes.

Please see attached spreadsheet (Mgmt Area Volumes.xls) for the requested information. Further information is included in the attached documents (Final Pond Survey and Hydraulic Analysis 10.06.06.pdf and Pond Detention Study Update Letter.pdf).



### 6. Provide the name of any entity with whom you have contracted for the disposal, sale, or reuse/recycling of coal combustion waste generated from your facility for the past five {5) years. Identify the type and amount of coal combustion waste that the company disposed of through such contracts each year for the past five (5} years.

Coal Combustion Use 2009 2008 2007 2006 2005 Product (tons) (tons) (tons) (tons) (tons)

SEFA Group Carbon burnout & Concrete Mfg. 77,770 183,053 158,851 147,571 139,304 STAR beneficiated fly ash

Holcin Intermingled fly & Concrete Mfg. 18,411 2,932 27,576 69,418 22,981 Cement bottom ash (ponded)

La Farge Intermingled fly & Concrete Mfg. 25,120 57,356 42,411 72,069 43,682 Cement bottom ash (ponded)

Giant Intermingled fly & Concrete Mfg. 0 0 0 0 4,535 Cement bottom ash (ponded)

Simmons Ponded fly ash Filler in polymers & 203 0 0 0 0 Cenospheres cenospheres specialty cements



### 7. 

### Identify all the waste streams generated at the facility for the past five {5} years. Referring to the labels provided for each management area provide a flow diagram showing each waste stream from the source of generation to its final disposition. In the flow diagram, include the following information: (a) description of the waste streams (including, but not limited to, fly ash, bottom ash and slag, combined fly and bottom ash, flue gas desu/furization sludge, co-disposed
Response to EPA Information Request Wateree Station



### 4

### and co-managed ash and coal refuse) and their chemical characterizations; (b) the daily and annual volume of each waste stream flow; and (c) the final disposition of the waste streams, including materials recycled or otherwise destined for beneficial use.

Waste streams generated during the past 5 years include:
a) process wastewater b) fly ash c) bottom ash d) FGD waste.

Wastewater discharges from this facility are permitted under NPDES Permit No. SC0002038 and consist of:

• Outfall 01A- an internal outfall consisting of recirculated cooling tower blowdown (the oncethrough cooling system and Outfalls 01 and 02 were eliminated years ago)

• Outfall 03A- the principle process wastewater outfall (also includes storm water) consisting primarily of coal pile runoff, Unit #1 

### & #2 ash sluice lines and boiler sumps, ammonia tank farm sump, water treatment wastes, FGD scrubber blowdown, yard and cooling tower area sumps, and ash landfill runoff

• Outfall 03B- an emergency outfall for Outfall 03A

Water is used to sluice bottom ash, and when necessary, fly ash to the #1 ash pond which is used as a settling pond. Bottom ash and fly ash are reclaimed from this pond for later beneficial use. Plant sumps also discharge to the #1 ash pond. Water is discharged from the #1 ash pond to the #2 ash pond where it is allowed to further settle and is chemically treated for pH, if necessary, prior to discharge from outfall 03A to the Wateree River. When both units are running at full load the ash sluice system is capable of using a maximum of 7560 gpm (10.9M gpd) of water. Adqitionally, when both units are running at full load the plant sump system is also capable of using a maximum of 7560 gpm (10.9M gpd) of water. However, the total flow from outfall 03A (the only plant discharge) is approximately 6.0M gpd (exclusive of any stormwater discharges and accumulations in the ponds)- so to maintain a constant level in the #1 and #2 ash ponds the total flow of the ash sluice pumps and the sump pumps should equal the flow from outfall 03A. See Discharge Monitoring Reports in question #8 response below for flow from outfall 03A. Generally, high-carbon fly ash is collected in silos and then pneumatically transported to the Carbon Burn Out Facility (CBO) on the plant property. The plant has a 1450 ton storage capacity for fly ash produced at Wateree Station and has an additional 500 ton storage capacity for fly ash produced at two other plants. The Carbon Burn Out process is capable of feeding 27.52 tons per hour (660.5 tpd or 241,082.5 tpy) into a fluidized bed combustor to reduce the residual carbon in fly ash. Low-carbon fly ash and flue gas exit the combustor and are ducted to a heat exchanger, where the hot exit gas is used**~or** heat recovery to heat boilerfeedwater at the steam-electric power plant. 100% of the fly ash from this process is then sold to concrete manufacturers. The plant has a 15,000 ton storage capacity for the CBO processed fly ash. The waste water stream also includes blowdown from 

## • Response to EPA Information Request Wateree Station



### 5the Flue Gas Desulfurization (FGD) scrubber system. The daily average blowdown flow rate is

. approximately 66 gallons per minute (gpmL which equates to approximately 34.7 million gallons per year. Solids are removed from the FGD blowdown stream using primary and secondary hydroclones, which are designed to remove the majority ofthe gypsum solids. The remaining settleable solids will be removed through settling within the FGD Blowdown ponds. The gypsum solids that accumulate in the FGD Ponds will be periodically removed and taken to an onsite landfill. There has not been a waste characterization performed on this material. Other waste characterizations are provided in the response to question 8. The chart below summarizes the annual amount of fly and bottom ash produced and the final disposition of the ash. All of the bottom ash produced goes to the #1 ash pond as does the portion of fly ash that is not directly sold to the concrete manufacturers or processed in the CBO facility. The chart also includes the amount of mixed (fly and bottom) ash reclaimed from the #1 ash pond and sold to cement manufacturers.

Year Fly Ash Produced Bottom Ash Tons Fly Ash to Fly Ash to Pond Pond Ash to (Dry tons) Produced (tons) Concrete Mfg. (tons) Concrete Mfg. 2009 114,423 28,606 

### 77,770 36,653 43,530 2008 216,760 24,084 183,052 33,708 60,288 2007 174,218 19,358 158,851 15,367 69,988 2006 176,689 19,632 147,571 29,118 141,488 2005 212,100 23,567 139,304 

### 72,796 71,196

For other waste stream diagrams please see attached:

(a) Wateree water/wastewater flow diagram (Wateree Block Fl<j>w Diagram rev 7.pdf)
(b) Fly ash storage and transport to Carbon Burnout facility (Wateree Fly Ash Storage.doc)
(c) Flow diagrams of ash production to ash ponds (fly and bottom ash) (Assessment# 7c- Ash Handling System 1.pdf and Assessment# 7c- Ash Handling System 2.pdf)
(d) Flow diagrams of plant sumps(Assessment # 7c- Sumpsl.pdf and Assessment# 7cSumps2.pdf)
(e) Design estimate oft he volume of gypsum produced based on the percentage of sulfur in the coal burned. (Wateree Gypsum Production.doc)



### 8. Provide any testing and analyses relied on to determine the characterization of the waste streams, as well as any sampling results of the waste streams obtained by the facility for the past five {5} years. For any sampling results provided, include a description of the sampling procedures used. Response to EPA Information Request Wateree Station



### 6

### Concerning the characterization of waste streams, attached is a coal pile runoff and ash characterization study that was conducted per South Carolina Regulation 61-107.19, Solid Waste Management. All samples were analyzed per EPA Methods as outlined in the report. Also included
are the latest 2C application that analyzes all waste streams from the plant and five years of NPDES Permit Discharge Monitoring reports. All samples were analyzed per EPA Methods as required by the NPDES permit /CFR Part 136.

Please see attached:
(a} Coal pile runoff pond sludge waste characterization report (sceg03704_ Wateree_ WC_rpt_May _18_scan.pdf)
(b) Fly Ash waste characterization (SCEG-WA3.xls)
(c) 2C Application for chemical analyses of waste streams. {20100616075943992.pdf}
(d) Discharge Monitoring Reports (01-06 DMR.pdfthrough 12-09 DMR.pdf)



### 9. Describe any wastewater discharges, including overflows, diversions, or other releases, that

occur or have occurred within the last ten (10) years from the management areas to surface waters, including tributaries, streams, rivers, lakes, ponds, and wetlands. Identify the discharge points and runoff paths on the map provided in response to request #2. Provide any analytical data or monitoring results from the last five (5) years that demonstrate hazard constituents in the wastewater discharges from the management areas to surface waters. Identify the management plans and treatment technologies that the company implements to control
wastewater discharges. Provide a copy of the National Pollutant Discharge Elimination System (NPDES} permit that authorizes these wastewater discharges. If the company has not obtained permit coverage, provide an explanation for this lack of cove,rage. Submit any discharge monitoring reports in which the company reported any wastewater violations from the last five (5} years.

The NPDES permit authorizes discharges of wastewater from outfall serial numbers 03A and 03B. The Wateree NPDES permit is attached. The permit requires sampling of the ash pond for oil and grease, total suspended solids, metals, ammonia, temperature, and toxicity. Coal combustion waste products are treated in the ash ponds by sedimentation and pH adjustment.

The only other discharges that have occurred over the last ten years have been from several incidences of stormwater overflow from the Coal Pile Runoff Pond, yard sumps and pump stations that have flowed to the Wateree River and have been reported to SC DHEC. These discharges would not contain coal combustion by-products other than trace amounts of flyash from maintenance activities. There is no analytical data or monitoring results that 

## • Response to EPA Information Request Wateree Station



### 7demonstrates any hazardous constituents in the wastewater discharges from the management areas to surface waters.

Please see attached:
(a) Current Wateree NPDES permit (Wateree Station NPDES Permit Mod Oct 1, 2009 (Oct 1, 2009- Dec 31, 2012).pdf)
(b) NPDES permit that will go into effect 1 July 2010 (Wateree Station July 1, 2010- Dec 31, 2012.pdf) Note: this permit is pending an appeal and has not become effective.

10. For all stormwater discharges associated with industrial activity from the facility, as defined at 40 CFR Sect. 122.26{a}{14}, identify the industrial activity (including the appropriate NAICS and SIC codes) that require coverage under an NPDES permit. In addition to the information provided about these discharges in response #9, provide a copy of the facility's current Storm water Pollution Prevention Plan (SWPPP} as well as copies of its comprehensive site evaluations, inspection records, and monitoring results for the last five {5) years. If the company has not developed a SWPPP, provide an explanation for this decision.

The SIC and NAICS codes for Wateree Station (Electric Power Generation) are 4911 and 221112 respectively. Wateree Station previously discharged process wastewater and all site stormwater under an individual NPDES permit (SC0002038). Stormwater that did not discharge through the primary 1\lPDES outfall under SC0002038 was previously covered by the special conditions of that permit. Upon renewal of SC0002038 (effective October 1, 2009), all stormwater discharges outside the primary process wastewater outfall were no longer covered; therefore, SCE&G has applied for coverage to discharge those stormwater outfalls under the SC General NPDES Permit (SCROOOOOO) for Storm Water Discharges Associated with Industrial Activities. Note that since the individual permit required the development and maintenance of

a Storm Water Pollution Prevention Plan (SWPPP), the Wateree Station simply transferred the SWPPP for compliance under the general permit.

Please see attached:
(a) Stormwater monitoring reports 2005-2007 (Assessment# 10- Stormwater Monitoring 2005- 2007.pdf)
{b) Stormwater monitoring reports 2008-2010 (Assessment# 10- Stormwater Monitoring 2008- 2010.pdf)
(c) Quarterly Inspection reports (Assessment# 10- Quarterly Inspections. pdf)
(d) Annual comprehensive site evaluations (Assessment# 10- Annual Comprehensive Site Evaluations. pdf)

Response to EPA Information Request Wateree Station



### 8(e) Stormwater Pollution Prevention Plan- part of integrated contingency plan (Assessment# 10- BMP 

### & SWPPP.pdf)



### 11. Describe any groundwater monitoring system in place at the facility. Provide any groundwater sampling and analysis plans, groundwater monitoring results that detected releases of hazardous constituents, and corrective actions taken in response to groundwater contamination. Identify the location of groundwater monitoring wells, both active and inactive, on the map provided in response to request #2.

The Wateree Station NPDES Permit contains requirements for nine groundwater wells located adjacent to the two ash ponds that treat and store coal combustion by-products. The wells are sampled semi-annually. The plant also has six wells associated with its newly installed scrubber sludge disposal system that are sampled quarterly. The wells are sampled per the attached Groundwater Sampling and Analysis Plans. Because arsenic levels above established drinking water limits were detected in two (2) of the groundwater wells, SCEG/Wateree Station entered into a Consent Agreement with SCDHEC for a mixing zone and corrective action to be taken in response to groundwater contamination. The Consent Agreement was issued Feb 22, 2001 and requires semi-annual monitoring ofthe ground water and surface water upstream adjacent and downstream ofthe ash pond impoundments. Reports are submitted to SCDHEC on June 30 and Dec 31 of each year. Every three years a comprehensive report is submitted to SCDHEC. The results of these reports have shown that arsenic levels are stable and meet the requirements of the mixing

zone.

Corrective actions to minimize arsenic contamination have included: (1) reclamation of pond ash,

. and, (2) processing of dry fly ash for sale to cement manufacturers.
a) Attached is the Wateree Groundwater and Sampling Analysis Plan that describes the groundwater monitoring system for the ash disposal site.- 20100615142639816.pdf
b) Attached are groundwater sampling results that exceeded NPDES groundwater limits.- 20100616145317866.pdf
c) Attached is the SCDHEC Consent Agreement for a Mixing Zone that addresses corrective action taken in response to groundwater contamination.

- 20100615145346362.pdf
d) Attached is a groundwater monitoring well location map.- 20100616143544634.pdf
e) Attached is the Wateree Groundwater and Sampling Analysis Plan that describes the groundwater monitoring system for the scrubber sludge disposal site.- Wateree GWMPrevised 4-lO.pdf



### 12. Describe any known spills or releases to groundwater from each management area within the last ten (10} years. 

## • Response to EPA Information Request Wateree Station



### 9There have been no known spills or releases to groundwater from Wateree Station. A groundwater Mixing Zone Agreement is in effect for Ash Ponds 1 and 2 as described in Response 

### # 13.



### 13. For each management area, identify any seepage flows, as well as their origins, flow paths, and destinations. Indicate the location of these flows on the map provided in response to request #2. Provide any reports or documentation with sampling results and/or information about the volumes of these seepage flows from the last five {5} years.

Two seeps were detected during a 

### 1997 inspection of the 

### #1 ash pond dike. SCE&G reported the seeps to DHEC and conducted several assessments of the seepage. In 

### 2001 SCE&G and DHEC entered into a Mixing Zone Agreement- which continues in effect today. Earlier this year, SCE&G commissioned a study of the areas surrounding the 

### #1 and 

### #2 ash ponds to determine the extent of the seeps. The report is contained on the enclosed disk entitled: Wateree Ash Pond Containment Structure Subsurface Investigation Report.

Please see attached for grab sample results of 

### #1 ash pond seepage volumes and arsenic concentrations reported to DHEC (Seep Data for DHEC.xls).



### 14. Provide any hydrological studies conducted at the facility within the last five {5) years.

Please see the attached Wateree Hydrogeological Characterization Report (Wateree LFHydrogeological Characterization Report (Dec 

### 2006). Additionally, the Wateree Ash Pond Containment Structure Subsurface Investigation Report in Question #13 above covers the area around the ash ponds.



### 15. 

### Identify any known drinking water wells within a five (5) mile radius of the facility's outer boundaries. Provide any monitoring or sampling results that demonstrate hazardous constituents present within these wells.

There are no known hazardous constituents in the drinking water wells within a five mile radius of the plant. There is no known monitoring or sampling of the wells within a five mile radius of the plant. Attached is a map (Wateree facilities- 5 mile radius map with groundwater water wells identified. pdf) and a spreadsheet (Coastai_Piain_wells-l.xls) (wells within 5 mile perimeter highlighted in yellow) with water well information. The information is from two different sources and does not match. The local Department of Health and Environmental Control (DHEC) has the following disclaimer on its information:

"Disclaimer: The SCDNR does not guarantee the accuracy of this well information. In many 

### cases, our well information comes from old records, and as a result, some of the information, such as the well

owner or the well use, may no longer be accurate. This is in no way a complete inventory of all the water wells in the South Carolina Coastal Plain."



### 16. Describe the cooling system at the facility. If applicable, submit the source of water withdrawn and the amount of water withdrawn in gallons per day. 

## if applicable, describe the cooling water

Response to EPA Information Request Wateree Station



### 10

### intake backwash system and identify the individual backwash flows, the volume and the discharge points for each flow. Submit any sampling results of the backwash.

Wateree Station is a two (2) unit power plant with each unit capable of producing 372 MW each. The main cooling system for each unit is a ten (10) cell counter flow cooling tower that operates in a closed cycle mode. The source of water and make-up water is from the Wateree River. The estimated maximum amount of water withdrawn for make-up water is 4.9 million GPO for each tower. The inlet screen backwash system consists offour (4) traveling water screens used in front of two (2) 100% make-up water pumps (11,000 gpm each). Each screen is cleaned off with spray nozzles using river water with any debris captured in a wire mesh basket. The water returns to the river at the intake. The total estimated maximum screen backwash flow and volume is 0.72 million GPO and 96,264 CFD, respectively. The screen backwash discharge point is the plant inlet canal. There are no screen backwash water samples taken. Additionally, each unit has a secondary cooling system. Each secondary cooling system is composed of a two(2) cell counter flow cooling tower that operates in a closed cycle mode. The source of make-up water is from the plant well system. The estimated maximum amount of make-up water withdrawn is 0.17 million GPO for each tower. There is no inlet screen backwash system. Please see attached Wateree water usage reports. (2010061513336557.pdf)



### 17. Provide analyses performed on slope stability, inflow design floods, or dam breaks for any of the management areas within the last five (5) years.

Please see attached geotechnical investigation report for the Wateree FGD pond (Wateree FGD Pond Geotech.pdf). A 2010 slope stability analysis for the #1 and #2 ash ponds is provided on a separate disk entitled Wateree Ash Pond Containment Structure Subsurface Investigation Report and Structural Stability Report.

Name

Tim Miller, Jr.

Mark Ferguson

Jean Claude Younan

Ralph M. Webb Sources of Responses

Position
Corporate Fossil/Hydro

Corporate Environmental Services
Corporate Environmental Services
Fossil/Hydro Compliance Title Questions Answered
Manager, Dam Safety and 1, 

### 13, 14, 17 Emergency Planning

Environmental Specialist 2, 

### 3, 5, 9, 10

Associate Engineer 

### 2,3,4,5, 14, 15,17

Senior Engineer 2, 

### 7, 8, 9, 11

Response to EPA Information Request Wateree Station

11Suzette Mangan Corporate Fossil/Hydro
April Kelly Wateree Station EHS Coordinator

Alan Oden Corporate Fossil/Hydro Engineer 

### 5, 6

Environmental and Safety 

### 3, 5, 7, 8, 9, 10 Supervisor
Manager, Engineering 

### 16

Response to EPA Information Request Wateree Station



### 12ElectronicSubmittalFormFileNameSoft:wa,reVersionFileSizeDateTimeCreatedCreatedSceg00110-basemap-S.iteMapAdobeAcrobatI8.11.06MB7/9/20107:46:11AMWatereeFacilitesUSGSAdobeAcrobat9.01.19MB6/29/201010:14:37AMFinalPondSurveyandHydraulic..IAnalysis10.06.06AdobeAcrobat9;04.24MB7/14/20102:01:30PMPondDetentionStudyUpdateLetterAdobeAcrobat9.01.26MB7/14/20102:01:43PM..MgmtAreaVolumesMierosoftExcel97-200330.5KB7/30/20102:34:14PM··Assessment#7c-AshHandlingAdobeAcrobat9.0217KB••••6/30/20108:37:24AMSystem1Assessment#7c-Sumps1AdobeAcrobat9.0161KB6/30/20108:37:24AMWatereeBlockFlow:Diagram-Rev.AdobeAcrobat9.0666KB7/29/2010..•.1:00:57PM7·······WatereeGypsumProductionMicrosoftWord97-200323.0KB7/1/20103:06:59PMAssessment#7c-AshHandling6/30/2010<...·AdobeAcrobat9.0225KB•8:37:24AM.·.System2Assessment#7c-Sumps2AdobeAcrobat9.0103KB6/30/20108:37:24AMWATEREEFlyAshStorageMicrosoftWord97-200343.0KB7/1/20109:42:03AM20100616075943900AdobeAcrobat9.02.87MB6/29/201010:31:35AMSCEG-WA3MicrosoftExcel97-20031.68MB6/29/201010:32:22AMWateree01-06DMRAdobeAcrobat9.01.69MB6/29/201010:36:12AMWateree01-07DMRAdobeAcrobat9.02.28MB6/29/201010:36:45AMWateree01-08DMRAdobeAcrobat9.02.37MB6/15/20105:08:46PMWateree01-09DMRAdobeAcrobat9.02.31MB6/29/20.1010:37:21AMWateree02-06DMRAdobeAcrobat1.68MB6/29/201010:36:12AMWateree02-07DMRAdobeAcrobat9.02.30MB6/29/201010:36:45AMWateree02-08DMRAdobeAcrobat9.02.34MB6/15/2010·...···5:09:20PMWateree02-09DMRAdobeAcrobat9.02.36MB6/29/201010:37:21AMWateree03-06DMRAdobeAcrobat9.02.33MB6/29/201010:36:12AMWateree03-07DMRAdobeAcrobat9.02.34MB6/29/201010:36:46AMWateree03-08DMRAdobeAcrobat9.02.45MB6/15/20105:10:12PMWateree03-09DMRAdobeAcrobat9.02.56MB6/29/201010:37:21AMWateree04-06DMRAdobeAcrobat9.01,61MB6/29/201010:36:13AMWateree04-07DMRAdobeAcrobat9.01.65MB6/29/201010:36:46AMResponsetoEPAInformationRequest-\/VatereeStation13ElectronicSubmittalForm.......Wateree04-08DMRAdobeAcrobat·•9.01.87MB6/15/20105:12:22PMWateree04-09DMRAdobeAcrobat'9:01.83MB6/29/201010:37:21AMWateree05..:05DMRSAdobeAcrobat.'9.0.·.·1.83MB6/29/201010:35:39AMWatereeDMRAdobeAcrobat9.01.85MB6/29/201010:36:13AMWateree05-07DMRAdobeAcrobat9.01.72MB6/29/201010:36:46AMWateree05-08DMRAdobeAcrobat9.01.78MB6/15/20105:13:06PMWateree05-09DMRAdobeAcrobat9.01.8MB6/29/201010:37:21AMWateree06-05DMRAdobeAcrobat9.01.94MB6/29/201010:35:40AMWateree06-06DMRAdobeAcrobat9.02.32MB6/29/201010:36:13AMWateree06-07DMRAdobeAcrobat9.02.23MB6/29/201010:36:46AMWateree06-08DMRAdobeAcrobat9.02.42MB6/15/20105:14:00PMWateree06-09DMRAdobeAcrobat9.02.51MB6/29/201010:37:23AMWateree07-05DMRsAdobeAcrobat9.01.61MB6/29/201010:35:40AM·•··Wateree07-06DMRAdobeAcrobat9.01.76MB6/29/20101.0:36:14AMWateree07-07DMRAdobeAcrobat9.01.79MB6/29/201010:36:47AMIWateree07-08DMRAdobeAcrobat9,o1.74MB6/15/20105:14:44PM.,>•••·····,··••...·...Wateree07-09bMRAdobeAcrobat9.01.83MB6/29/201010:37:23AMWateree08-05DMR',,'AdobeAcrobat9.01.48MB6/29/201010:35:40AMWateree08-06DMRAdobeAcrobat9.01.82MB6/29/201010:36:15AMWateree08-08DMRAdobeAcrobat9.01.74MB6/15/20105:16:14PM•Wateree08-09DMRAdobeAcrobat9.01.80MB6/29/201010:37:23AMWateree08-2007DMRAdobeAcrobat9.01.59MB6/29/201010:36:48AMWateree09-05DMRAdobeAcrobat9.02.01MB6/29/201010:35:40AMIWateree09-06'DMRAdobeAcrobat9.02.38MB6/29/201010:36:16AMWateree09..:0SDMRAdobeAcrobat•·'·9.02.46MB6/15/20105:17:10PMWateree09-09DMRAdobeAcrobat9.02.87MB6/29/2010.10:37:23AMWateree·09-2007DNRAdobeAcrobat9.0..•2.13MB6/29/201010:36,:48AMWateree1.0-05DMRAdobeAcrobat9.01.80MB6/29/201010:35:40AMWateree10-06DMRAdobeAcrobat9.01.75MB6/29/201010:36:16AMWateree10-08DMRAdobeAcrobat9.01.81MB6/15/20105:17:46PMWateree10-09DMRAdobeAcrobat9.02.21MB6/29/201010:37:24AM.Wateree10-2007DMRAdobeAcrobat9.01.61MB6/29/201010:36:48AMWateree11-05DMRAdobeAcrobat9.01.93MB6/29/201010:35:41AMWateree11-06DMRAdobeAcrobat9.01.64MB6/29/201010:36:16AMResponsetoEPAInformationRequest-WatereeStation14Electronic Submittal Form

Wateree 11-07 DMR Adobe Acrobat 9.0

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Wateree 11-08 DM R

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Wateree 11-09 DMR Adobe Acrobat 9.0 2.11 MB ··6/29/2010 10:37:25 AM

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Wateree

12-05 DM R Adobe Acrobat 9.0 2.39 MB 6/29/2010 10:35:41AM

····· Wateree 12-06 DMR Adobe Acrobat 9.0 2.73 MB 6/29/2010 10:36:17 AM

Wateree 12-07 DMR Adobe Acrobat 9.0

.... 2.91 MB 6/29/2010 10:36:49 AM ·•

Wateree 12-08 DMR ·.····· Adobe Acrobat 9.0 2:>82 MB 6/15/2010 5:19:18 PM

Wateree 12-09DMR .· .... Adobe Acrobat 9.0 4.63 MB 6/29/2010 10:37:25 AM '

Wateree Station July1, 2010- Dec

Adobe Acrobat 9.0 4.00 MB 6/29/2010 10;52:26 AM

31,2012 Wateree Station NPDES Permit Mod

Oct 1, 2009 (Oct1, 2009- Dec31, Adobe Acrobat 9.0 3.62 MB 6/29/2010 10:51:38 AM

2012) · .. Assessment

#1 0 - Annual ···

Adobe Acrobat 9.0 1.79MB 6/29/2010 10:58:56AM

Comprehesive Site Evaluations ...

Assessment #10- Quartlerly

Adobe Acrobat 9.0 3.05 MB 6/29/2010 10:58:56AM

Inspections

.... ··.

Assessment

#1 0 - Stormwater

Adobe Acrobat 9;0 9.73 MB 6/29/2010 10:59:34AM

Monitoring 2008-2010

· ... · ···.

Assessment#10 -.BMP & SWPPP Adobe Acrobat 9.0 8.10 MB 7/9/2010 7:52:28 AM

Assessment #10- Stormwater

Adobe Acrobat 9.0 4.57 MB 6/29/2010 10:58:57 AM

Monitoring 2005-2007 Assessment #10 Table A7-1 Adobe Acrobat 9.0 1.18MB 6/29/2010 10:58:5TAM

20100615142639800 Adobe Acrobat 9.0 6.26 MB 6/29/2010 1:12:46PM

20100615145346300 Adobe Acrobat 9.0 1.03MB 6/29/2010 t:12:46 PM

Wasteree GWMP- revised 4-10 Adobe Acrobat 9.0 2.60 MB .7/29/2010 9:20:24AM

20100615145317800 Adobe Acrobat 9.0 1.13MB 6/29/2010 1:12:46 PM •

20100616143544600 Adobe Acrobat 9.0 200 KB 6/29/2010 1:12:46 PM

Seep Data for DHEC Microsoft Excel 97-2003 25.0 KB 8/2/2010 3:46:59.PM

Wateree LF- Hydrogeological

Adobe Acrobat 9.0 12.9MB 6/30/2010 8:29:40AM

Characterization Report (Dec 2006) ..

.. Coastal Plain wells-1 Microsoft Excel 2.03 MB 6/29/2010 10:15:27 AM

Response to EPA Information Request- Wateree Station

15•WatereeFacilities-5mileradiusmapwithgroundwatewaterwellsIAdobeAcrobatidentifiedEPAResponseElectronicSubmittalForm9.019.5MB6/29/2010I10:15:11AMAshPQnd.Containment1111toEPAlnformaflonRequest-WatereeStation16' !