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HomeMy WebLinkAboutNC0004979_Permit Application 2009_20091203t P&Aeirgy. 1L,e December 2, 2009 Mr Charles H Weaver, Jr. State of North Carolina Department of,Environmentand Natural Resources Division of Water Quality NPDES Unit 1617 Mail Service Center Raleigh, North Carolina 27699 -1617 CORPORATE EHS SERVICES Duke Energy Corporation 526 South Church St Charlotte, NC 28202 Marling Address EC13K / PO Box 1006 Charlotte, NC 28201 -1006 R"mmC'- v L L � C D LE C - 3 2009 D E N R - WATER QUALITY POINT SOURCE BRANCH' Subject Duke Energy Carolinas LLC — NPDES Permit Application AIIen,�Steam� Station - #NC,0004979 Dear Mr Weaver Duke Energy Carolinas, LLC requests the subject permit be. renewed and reissued The above referenced permit expires May 31, 2010 As mandated by North Carolina Administrative Code 15A NCAC 21-1.0105 (e), this permit application for r renewal is being submitted at least 180 days prior to expiration of the current permit Please find enclosed in triplicate, the renewal application, which includes the following items EPA Form 1 EPA Form 2C ;EPA Form 2F Site Maps Water Flow Diagram Supplemental Information Duke Energy Carolinas, LLC requests notification that this application is complete. Additionally, the attached report, "Assessment of Balanced and Indigenous Populations in Lake Wylie," continues to indicate the maintenance of balanced mdegnious populations Therefore, this, report supports renewal of the current thermal monitoring requirements of outfall #001 www duke- energy com The following monitoring reductions at outfall #002 are requested based on historical monitoring data • Reduce copper sampling from twice per month to monthly Thank you in advance for your- assistance on- this matter Should you have questions regarding''fihis application, please contact me at (.704) 382 -4309. Sincerely, Allen Stowe Water Management Attachments cc w/- Mr Robert Krebs - NCDENR Mooresville R O Mr Jay Sauber — NCDENR, Raleigh, N C. (BIP Report 3 copies) It y ir L j, 3 C Allen Steam Station sr 002B I k' N t,)k • 4 W ..... ..... ... -,j. Lit Tit In 10 Po-Od z-: -`N-N J 51 L I A �4 X, t. vill nl I f'z" le ;� lw%Z 'X� fl J Al �f"��lfl Legend I NPDES Outfall Location A NPDES Outfall Number 001 1 Duke Energy Property Boundary k REFERENCE: 0 0.5 1 BACKGROUND DATA: 1:24000 USGS TOPOGRAPHIC QUAD (BELMONT) , WAS OBTAINED Kilometers a FROM NCIDOT GEOGRAPHICAL INFORMATION (GIS) WEBSITE. THE PROPERTY DATA 0 0.5 1 WAS OBTAINED FROM THE GASTON COUNTY NORTH CAROLINA GIS DEPARTMENT PLEASE NOTE THIS DATA IS FOR INFORMATIONAL PURPOSES ONLY. Miles SCALE: AS SHOWN FIGURE LOCATION MAP DUKE NO. DATE: 10-26-2009 Duke ALLEN STEP S' DRAWN BY: RDP NPDE PROJECT NO: Energy® L 1411-08-140 GAST Y `o LL m • t > l0 c� Um 0 N A U m U m `m ♦ U. m O Q C O 4 � m —T O� U Lp cu E _ so co 4 � L 0 cu t� V/ 0 O C N Q C cu f.' N �N fC �c N � 9 C C O 0 UU a �3 ,O. U� N _O C7 f0 7 pp 0— 7p a c } E N co m 0 N L U m U m 0 V). rn c c Em 0 U m y, E c 3 U o� � C> O° LL LL 0 LL 0 U- a l m N 3 (D U m U m 0 V). ♦ U. a� m O N E � n c E 7 � O O. a� CO E LL €' Q� o co ro N CO 0 (o Q W °a U � y C 0 E 0 m Q 0 E L Q 'd 3 � E € cn J � C °?E N l E.O-L �jLLm N 3 (D CU) 2 E �Lo E O O <D � m —T T T- E � n c E 7 � O O. a� CO E LL €' Q� o co ro N CO 0 (o Q W °a U � y C 0 E 0 m Q 0 E L Q 'd 3 � E € cn J � C °?E E �a C NL �m E.O-L �jLLm N 3 (D CU) m a 3 d m iv 0: U Allen Steam Station, Gaston County NPDES Permit No NC0004979 Page 3 ,of 26 1,.0 GENERAL INFORMATION Plant Allen utilizes waters from the ,Catawba River for condenser�cooling and service water requirements. A brief discussion of each discharge follows. All flows are based on historical data where ipossible or pump design capacities and normal run - times. 2.0 OUTFALL INFORMATION 2.1 Outfall 001 - Condenser Cooling Water (CCW) The CCW system is a once - through, non - contact cooling water system that removes heat rejected from the condensers and other selected heat exchangers and then discharges into the South Fork River. Each of the 5 units at Plant Allen has two condenser cooling pumps. The number of pumps used is dependent on ,unit; load and intake temperatures with more pumps running with higher loads and intake temperatures. Units 1 and 2 share a common cooling water supply °tunnel served by a total of 4 CCW pumps. Units 3 and 4 also share a tunnel ,and 4 CCW pumps. Unit 5 has, a separate tunnel and ,2 CCW pumps. The common tunnel design enables three pumps to give Units 1 and 2 or 3 and 4 the equivalent of 1 Y2 pump operation. The 1 %2 pumps operation adds an economical range or flexibility when units are on partial load and when intake water temperatures are minimal. Unit ,No. 1 -Pump GPM 1.5-Pump GPM 2-Pump GPM 1 '55,500 74;800 83,500 2 55,500 74,800 83,500 3 83,000 111;200 126,000 4 83,000, 111,200 126,000 5 83,000 - - -- - -- -- .. - 126,`00,0 All condenser tubes at Plant Allen ,are cleaned manually with metal or rubber plugs. Mechanical cleaning is required once a year for most units. A leak test is performed periodically on the condenser- tubes. (See section 2'.2:6.4.) If leaks are detected, then one method used to temporarily, stop small leaks is to add sawdust to the CCW system, as previously approved by NCDENR. The sawdust is added at amounts `that will plug the leaks and not result in an environmental impact: This is, a temporary measure until the unit can come, off -line so the leaks can be permanently repaired. Use of the supplemental pumping system that was approved for operation from July through September 2008 is proposed on an as- needed basis between July and September of each year. During operation of the supplemental pumping system, calculation of Allen Steam Station's CCW discharge temperature for Outfall 001 will be modified to include the temperature of the supplemental Allen Steam Station, Gaston County NPDES Permit No NC0004979 Page 4 of 26 cooling water pumping system based on the system flow and Allen Steam Station's CCW intake temperatures, as was done in 2008. The supplemental pumping system will enable Allen Steam Station to extend power production in compliance with current thermal limits that assure protection of the aquatic community and downstream users. 2.1.1 Asiatic Clam /Debris Filter Backwash Water'for the Unit 5 CCW water is filtered for any twigs, leaves and other -light debris, which passed through the intake screens. Asiatic clams, which are common `in Lake Wylie and can clog the condenser tubes, are also captured in this filter. This filter is backwashed once a week for 15 minutes. A maximum flow of 3000 GPD is realized. No additives- are in the backwash water., The twigs,, leaves, clams and other light debris collected in the debris filter are indigenous to the river and are therefore flushed back with no harmful environmental consequences. 2.2 Outfall 002 - Ash Basin 2.2.1 Boiler Cleaning All five boilers at Plant Allen are chemically cleaned with the next cleaning as needed. The volume of the boilers determines the quantity of chemicals required for a cleaning., Boilers #1 and #2 each have a waterside volume of 26,700 gallons. The volume of'boilers #3, #4, and #5 is 40,100 gallons each. The "volume of dilute waste chemical discharged from unit #1 or #2 during a cleaning is 294,000 gallons. The volume of diluted waste chemicals drained from #3, #4 and #5 totals 450,000 gallons each. These wastes are drained through temporary piping to the permanent ash removal lines, which flow to the ash basin. Immediately prior to the beginning of a boiler chemical cleaning procedure, additional stop logs are added to the ash basin discharge structure. This action assures longer retention time of the chemical wastes for proper treatment through dilution, neutralization, precipitation, and ion - exchange as documented in the Ash Basin Equivalency Demonstration (October 1976). Allen Steam Station, Gaston County NPDES Permit No NC0004979 Page 5 of 26 A list, of the chemicals and amounts required to clean the boilers at Plant Allen follows: CLEANING CHEMICALS Sodium bromate Ammonium carbonate Ammonium hydroxide* Hydrochloric acid* Thiourea* Citric acid Sodium Sulfite Ammonium bifluoride Detergent (Triton —X) Antifoam agent AMOUNT USED PER UNIT Boiler #1 and #2 550 Ibs 1000 Ibs 850 gal 3700 gal 1680 Ibs 300 Ibs 100 Ibs 1100 Ibs 20 gal 10 gal Boiler #3, #4 & #5 550 Ibs 1000 Ibs 950 gal 5500 gal 2010 Ibs 400 Ibs 100 Ibs 1700 Ibs 20 gal 1,0 gal, During a chemical metals cleaning these chemicals are present in amounts greater than the reportable quantity as identified under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA). If a spill of any these chemicals were to occur, in most cases, it would be routed to the ash basin for treatment. Alternately, the boiler may be cleaned using ethylenediaminetetraacetic acid (EDTA). If EDTA is used for cleaning, no waste water'will be discharged to the ash basin, rather all cleaning waste waters will either be evaporated in the boiler or collected and transported off -site for proper treatment and disposal. 2.2.2 Stormwater run -off Storm water run -off enters the ash basin from the from the ash basin's drainage area, the yard drainage sump, the coal yard sump, the FGD storm water basin and' the landfill'leachate sump. The powerhouse sump and ,the limestone storm water sump discharges'its rainfall run -off, into the yard drainage sump. A more detailed description of the sump systems and stormwater run -off is included in section 3.0. 2.2.3 Sanitary Wastes Sanitary waste at Plant Allen is treated in a septic tank with ,the effluent from the septic tank,being discharged to the Ash Basin via the Coal Yard sump. Approximately 150 people are responsible for the load on this system. An average flow of 4850 GPD is treated by the system. The drinking water is supplied by City of Belmont Utilities Department. 2.2.4 Ash Sluice Plant Allen has converted to a dry ash handling system. Ash collected in'the electrostatic precipitators ,is transported .by compressed air to two silos where ash is transferred to trucks for ultimate disposal in the newly constructed on -site Allen Steam Station, Gaston County NPDES Permit No NC0004979 Page 6 of 26 landfill. Wet sluicing is still utilized during times of start up and dry system upset. Bottom ash sluicing to the basin requires approximately 6.0. Plant Allen presently has additional air pollution control systems installed on three units. Use of these systems entails the use of low concentrations of ammonia and sulfur compounds. These, systems aid in the collection of the ash in the electrostatic precipitators. 2.2:5 Recirculating Water System (RCW) Plant Allen has 2 ROW systems: a chiller system and a pump cooling water system. Both�systems use the biocide Nalco H -550 or similar products. In addition, the corrosion inhibitor Nalco CS -4710 or similar product is used. Generally, these systems are closed loop, but may need to be drained occasionally. All such water would enter the floor drains and then be discharged to the ash basin: 2.2.6 Miscellaneous Waste Streams 2.2.6.1 Turbine Non- destructive Testing Approximately once per year, one turbine is tested ,for cracks in the generator shaft using an ultrasonic nondestructive test. During the process a maximum of 400 gallons of demineralized water mixed with 4 gallons of corrosion inhibitor.is used and discharged to, the ash basin., 22.6.2 Heat Exchanger Cleaning From time to time, it may be necessary to clean the small heat exchangers with polyacrylarhide, polyacrylate, sodium laurylsulfate and tri- sodium phosphate. All, wastewater would be routed to the ash basin. 2.2.6.3 Condensate Polishers: Plant Allen utilizes condensate polishers which divert a portion of,the normal condensate (closed system) flow through one of two cells per unit. The polishers provide filtration as well as ion exchange functions to remove or substantially reduce di'ssol'ved solids and suspended matter present in the condensate stream. The polishers require precoating with a combination of anion and cation resin. To facilitate precoating, 125 -150 ml of a solution of polyacrylic acid (25 %) is 'added to the precoat slurry. Upon exhaustion, the precoat is removed from the filters by water / air blasting and flushed to the ash basin via sumps. Condensate water is used to remove the exhausted precoat at the rate of: • Unit 1 & 2 - 1558 gal /precoat • Units 3, 4, & 5 - 2090 gal /precoat. A total average waste flow of approximately 980 GPD to the ash basin is realized. Allen -Steam Station, Gaston County NPDES,Permd,No. NC0004979 Page 7 of 26 2.2.6.4 Condenser Leakage Testing: Fluorescing.Dye Method - Approximately 1 lb. �of a disodium fluorescing dye added to 280,000 gals of demineralized water is used occasionally to test the condensers for leakage. All wastewater from the testing would be routed to the ash basin. Sulfur Hexafluoride Method - Periodically, sulfur hexafluoride is injected into the condenser tubes to locate condenser tube leaks. Sulfur hexafluoride is a chemically inert, nonflammable, nontoxic gas with an extremely low'water solubility. It is estimated that 150 grams of sulfur hexafluende would be used during the leak detection ,process. Most of the sulfur hexafluoride would be volatilized, during the process. 2:2.6.5 FGD Stormwater Sump Stormwater collected at FGD site'including: the dry ash hand ling� facility, gypsum pile, WWTS area (not process water), stack, absorbers, switchgear building, dewatering building, reagent prep building, and the control room area is routed to a large stormwater collection basin prior to being pumped to the ash basin (See Section 3.4 for amore detailed description of FGD stormwater sump) 2.2.6.5 Landfill Leachate collection discharge: Industrial Solid Waste landfill (Permit No. 36 -12) permitted to acceptcoal combustion byproducts (fly ash, bottom ash, gypsum, WWTS filter press sludge cake) consists of a double liner with leachate collection system. Collected leachate will be pumped to ash basin. 2.2.7 Ash Basin Treatment Sulfuric Acid System- An acid injection system utilizing 93 % sulfuric acid is operated as needed to maintain pH level below 9.0 standard units. Sodium Hydroxide System - A sodium hydroxide injection system utilizing 25% or 50% sodium hydroxide operated as needed to maintain pH level above 6.0 standard units. 2.2.8 Yard Drain Sump The yard drain sump is a large concrete structure that has three level controlled pumps, which pump wastewater from Plant Allen to the ash basin. These pumps are operated on a rotating basis. The combined average flow from all sources tied to the yard drain sump is, approximately 4.0 MGD. (See Section 3.4 for a more detail description of rainfall run =off entering the yard drain sump.) Below is a description of waste streams going to, the yard drain sump: 2.2.8.1 Boiler Room Sumps (Units 1 -4) The water which flows to the boiler room sumps originates from such sources as floor wash water, boiler blowdown, water treatment waste, condensates, equipment cooling water, sealing water and miscellaneous Allen Steam Station, Gaston County NPDES Permit No N60004979 Page 8 of,26 leakage (refer to the attached schematic of water flow for individual flows). The effluent from the units 1 through 4 boiler room sumps is flushed to the yard drain sump. The effluent from the unit 5 boiler room sump is flushed to the power house sump, which is then,flushed to the yard drain sump. 2.2:8.2 Turbine Room'Sumps The turbine room sumps accommodate flows from floor washing, leakage, and occasional condenser water box drainage. Effluent from units 4 through 5 turbine room sumps is flushed to the yard drain sump. 2.2.8.3 Limestone Unloading /Storage Area Sump Limestone sump collects stormwater from limestone unloading and storage area and routes to YD sump via PH sump dischage line. (See Section 3.4 for -a more detail description of limestone sump) 2.2.9 Water Treatment "System The water treatment wastes consist of sedimentation, filter backwash, reverse osmosis (RO) concentrate, demineralizer regeneration wastes- and boiler blowdown. The make -up water treatment system is comprised of a clarifier, two pressure filters, two activated carbon filters, pre RO filters, a reverse osmosis machine and one set of demineraiizers. Make -up water is used in the boilers and closed cooling systems. Clarifier: The clarifier has an average production of'0.252 MGD. Caustic or ferric sulfate /ferric chloride are used to affect precipitation and thus remove suspended solids from the raw river water. Desludging of the clarifier takes place approximately 8 °/0 of the unit run -time with an average volume of 2300 -GPD going to the ash basin. Pressure Filters: There are two pressure filters which follow the clarifier in the, water treatment process. These filters, are backwashed once per week with a waste flow of 11,000 gallons per backwash. Each pressure vessel will contain 84 ft3 of anthracite, 50 ft3 of quartz, 25 ft3 of garnet and 41, ft3 of'garnet/quartz support media. Each vessel will use product water to backwash at a rate of 750 gpm. On average, both vessels is backwashed once, per,week. The contents of,the pressure filters will be changed out, as internal maintenance requires, and the used filter medium will be sluiced to the ash basin. Activated Carbon Filters: In addition to the pressure filters, there are two activated carbon filters. These filters are backwashed twice per month. Approximately 30,000 gallons of water are required to backwash each of these filters. The activated carbon filters are! composed of approximately 250 ft3 of granular, activated carbon (coal). The spent filter medium is changed out yearly and sluiced to the ash basin. Allen Steam Station, Gaston,County NPDES Permit No. NC0004979 Page 9 of 26 Reverse Osmosis (RO) Unit: A RO unit is used to decrease the conductivity in the filtered water, thereby increasing the efficiency,of the dernineralizers and reducing the amount of chemical needed for demineralizer regeneration. During operation, the unit has a continual blowdown of 60 gal /min, which is discharged, to the ash basin. The RO unit is cleaned on a quarterly, basis with the waste, going to the yard drains and eventually the ash basin. During a cleaning, approximately 30 Ibs of a sulfamic acid cleaner along with 5 gallons of biocide, 2 liters of sodium hydroxide, and 0.5 gallons of sodium lauryl sulfate is used. Demineralizer: The dernineralizer,consists of two mixed =bed cells. Only one of these. cells is operated at any one time. The cell which is in operation is regenerated approximately once every 7-14 days of operation. A regeneration requires 42 gallons of sulfuric acid (78 -80 %) and 150 gallons of 50% sodium hydroxide. An average dilute waste chemical and rinse flow of 20,000 gal, is realized. The dilute acid and caustic are discharged to the floor drains simultaneously through the same header for neutralization purposes, All regeneration wastes are flushed to the ash basin. The demineralizer resin is changed out approximately once every 1'0 years and the spent resin is sluiced; to the ash basin. Approximately 1 milliliter of the surfactant Triton CF -54 or similar product is added to the new resin to improve separation. Boiler Blowdown: Each of the five boilers at Plant Allen blowdown at an average rate of approximately 500 lbs. of steam per hour. The blowdown is allowed to flash in a blowdown tank. Most of the blowdown is vented to the atmosphere with a minimal amount of condensate discharged to the boiler room sump. The average condensate flow'to this sump is 0.004 MGD. Hydrazine is maintained at a concentration of'25 ppb in the condensatwsystem fordeoxygenation. A minute amount of hydrazine ( <10 ppb) may be present in the condensate flow to the boiler room ,sump. 2.2.1`0 Preheater'Washes Preheaters are backwashed with raw water approximately 2 times per year to remove ash and corrosion products. 'There are 12 preheaters at Allen that would require approximately 100,000 gallons of backwash water each. 'The backwash water°�is routed ,to the ash basin through the yard drain sump. 2.2.11 Laboratory'Wastes The plant chemistry and the FGD chemistry laboratories on site perform a variety of water analyses and routine sample collections. Therefore several chemicals are, used in the lab in small quantities for sample preservation, bottle rinsing, equipment calibration, conductivity analysib etc. The wastes are, flushed down the sink and discharged into the yard drain sump and then pumped to the ash basin. Some,of the laboratory chemicals are as follows: Ammonia molybdate, Acetic acid, Ferric sulfate, Hydrochloric acid, Monoethylamine, Nitric acid and Potassium hydroxide. Allen Steam Station, Gaston County NPDES,Permit No NC0004979 'Page 10 of 26 2.2.12 Power House Sump (Unit 5) 'The wastes, which enter the floor drains at Plant Allen, accumulate in the boiler room sumps and turbine room sumps. The water which flows to the boiler room sumps originates, from such sources as floor wash water, boiler blowdown, water treatment waste, condensates, equipment cooling water, sealing water and miscellaneous leakage. Effluent from the unit 5 boiler room sump is flushed to the powerhouse sump, which is then flushed to the yard drain sump. This sump also receives stormwater from various drains located on the north end of the powerhouse. (See Section 3.4 for a more detail description of rainfall run -off entering the powerhouse sump.) 2.2.13 Physical Chemical Treatment System The purpose of this system is to provide a chemical injection system for treatment of dissolved pollutants that would not settle out of the wastestream through purely physical means. The system treats 4 -6'MGD sluice water to'reduce the Total Suspended Solids (TSS) and selenium to below, permit limits. The three primary settling cells are used to settle the; solids (one at a time, while the inactive cells are being cleaned). The treatment channel conveys settled sluice wastewater to the secondary settling or flocculation cell. Approximately 25 -50 gpm of the settled waste stream from the treatment channel is pumped into the chemical treatment building. This wastewater stream provides the opportunity to take samples before and after treatment and serves as the chemical injection point. The chemicals that 'are presently utilized for treatment in this system are: sulfuric acid,, ferric sulfate, ferric chloride and sodium hydroxide. After chemical addition and mixing in the - treatment channel, the treated waste stream is discharged into a floc settling basin to allow' sufficient settling time for any precipitated compounds to settle prior to discharge. Overflow from�the final settling cell flows through a vegetated ash delta prior to discharge to the main pond. 2.2.14 Selective Non - Catalytic Reduction (SNCR) As part of the compliance with the North Carolina Clean Air Initiative (NCCAIR), Allen has installed a urea based "trim" Selective Non - Catalytic Reduction (SNCR) systems on all five, units. The trim SNCR systems are expected to reduce NOx emissions, by approximately 30 %. SNCR systems operate by injecting urea into the upper section of the boiler where a chemical reaction occurs to reduce the NOx to water and nitrogen. Some residual ammonia will be ,collected on the fly ash in the electrostatic precipitators and a small amount will be carried to the ash basin. 'However, the operation of the SNCR system is not expected to require, additional treatment capabilities to ensure compliance with NPDES permit limits. Allen,Steam Station, Gaston county NPDES Pennit'No NC0004979 Page 11 of 26 2.2.15 Flue Gas Desulfurization (FGD) A Wet Flue Gas Desulfurization (FGD) system has been installed' at Allen for the reduction of SO2 from the stack gas. The following provides a description of the FGD system at Allen. In a Wet Scrubber system, the SO2 component of the flue gas produced from the coal combustion process is removed by reaction with limestone -water slurry. The particular system used at Allen collects the flue gas after it passes through the electrostatic precipitator, and routes the gas into the absorber tank. As the gas rises through the tank to the outlet at the top, the gas passes through a spray header. A slurry of water and limestone droplets is continually sprayed through this header into the stream of flue gas. The SO2 in the flue gas reacts with the calcium in the limestone and produces SO3. 'The SO3 slurry falls to the bottom of the tank where a stream of air is injected to oxidize the slurry to form gypsum (CaSO4.2H2O). The gypsum slurry is drawn off'the absorber tank and subsequently pumped to a vacuum belt filter. Part of the, process water from the FGD system is blown down in order to maintain the FGD water chemistry within the FGD system specifications. This water 'is treated 'in a wastewater treatment .system that discharges to the ash basin via internal Outfall 005. The FGD system has a material handling system that supplies limestone to the scrubber and a gypsum storage area for the gypsum removed from the process. The limestone comes onto the site by rail and is ,then transferred to the FGD site via a covered conveyor. Runoff from the storage area is routed to the, ash basin. The gypsum is routed from the FGD tank'to a dewatering belt and then to, a covered conveyor belt that will carry it to a storage pile. The runoff from this area is also routed to the ash basin. 2.3 Outfall 002A — Coal Yard Sump Overflow An overflow pipe that directs flow from the sump to the Catawba River was, included in the construction of the coal yard sump. This modification was implemented to prevent submergence and damage of the pump motors within the sumps in ,the event that all pumps failed or redundant power;supply lines could not be restored in a timely manner. 2.4 Outfall 0026 — Powerhouse Sump Overflow An overflow pipe that directs flow from the sump to the ground was included in the construction of the powerhouse sump., This modification was implemented to prevent submergence and damage of the pump motors within the sumps in the event that,all pumps failed or redundant power supply lines could not be restored in a timely manner. If enough water overflows, the waste water could potentially get,to the Catawba River. Overflow has not occurred during the last permit cycle. 2.5 Outfall 003 — Misc Equipment Cooling & Seal Water Outfall 003 discharges into the CCW discharge canal. The discharge consists of cooling water from units 4 and 5 boiler feedpump hydraulic coupling coolers and other miscellaneous equipment cooling. This water is once - through, non - contact cooling water withdrawn from the service water system. Allen Steam Station, Gaston County NPDES Permit'No. NC6004979 Page 12 of 26 Approximately 10,000 gpd' of bearing cooling water for the ash line booster pump is routed back to the discharge canal via a stormwater outfall in the vicinity of outfall 003. The water is once through, non - contact cooling water withdrawn from the service'water system. 2.6 Outfall 004 — Equip. Cooling & Intake Screen'Backwash 2.6.1 Equipment Cooling Water Cooling water for units 1,2 & 3 boiler feed pump hydraulic coupling coolers and other miscellaneous equipment is, discharged through outfall 004. This, water is once - through, non - contact water drawn from the service water system. In addition, water from a vehicle rinse -d'own area'is directed to this outfall. The rinse water contains no soaps or other additives. Allen has also added a new chiller system for comfort cooling that is a once'through non contact cooling water system.and discharges back to the river °via outfall 004. 2.6.2 Intake Screen Backwash. The intake screens at Plant Allen are flushed on an "as needed" basis. Backwash usually averages 2 hours per shift. The average volume required is 0.053 MGD. The large debris floating on the river is caught on the parallel bar screens. This trash is collected and disposed of'in a landfill. The silt, twigs,, leaves and other light debris collected on the rotating screens are indigenous to the river and are therefore flushed back into the river with no harmful environmental consequences. 2.8 (Internal) Outfall 005 — WWTS Effluent Discharge FGD purge water is routed to a WWTS consisting of a physical- chemical process designed to precipitate heavy metals and remove suspended solids. The clarified product water is routed to a series of bioreactors designed for selenium and nitrate removal: Thee bioreactor product water pis discharged to, the.ash basin via Outfall 005 in the vicinity of the floc settling basin (as noted in Section 2.2.13 above) 3.0 STORMWATER GENERAL INFORMATION 3.1 Site Description Allen Steam Station property covers approximately 953 acres. The powerhouse, the plant yard, the coal pile, the switchyards, and associated material and equipment, storage areas cover about 65 acres. These developed areas are generally flat. There are approximately 5 miles of rail access and 1.67 miles of paved roadways on -site. Coal and limestone is shipped to the site by rail lines., There is a 64 acre, retired ash basin currently being converted to a double lined with leachate collection landfill for disposal of coal combustion byproducts . The active ash basin has a surface area of about 176 acres, and it receives runoff from another 112 acres. Allen Steam,Stabon, Gaston County NPDESrPermit,No. NC0004979 Page 13 of 26 Based on information from the Soil Survey of Gaston County, North Carolina, the original site soils at Allen Steam Station were from the Gaston series. These soils are classified as sandy clay loam with red clay in the subsoils. In developed areas, the soil profile has been altered by grading and filling. The site topography is generally flat with rolling hills in outlying, undeveloped areas. 3.2 Storm Water Drainage'System In developed areas, runoff flows overland to ditches and catch basins, which are connected to a buried network of corrugated metal pipes (CMP). Rainfall runoff from the coal pile and coal handling areas and portions of the plant yard goes to the yard sumps that discharge to the ash basin. Storm water runoff from other areas of=the site is discharged to the Catawba River and the South Fork River. Rainfall runoff from the transformer yard area and the 115 KV switchyard is routed through oil traptanks prior,to being discharged. 3.3 Characterization of Drainage Basins A description of the drainage area, significant materials, and material control measures is presented for each drainage basin. Herbicides are spot applied where required in parking areas, switchyards, parts laydown areas, along walkways, and around various fixtures and 'buildings. 3.4 Storm Water Outfalls Characteristics for 16 individual outfalls and one group of outfalls are presented. Stormwater Outfall 1 Discharge Structure: 10 inch ( ") diameter () CMP Location: North of station on railroad tracks Drainage Area: 5.4 acres Area Description Thi&outfall conveys runoff from undeveloped, wooded area, upland of the railroad tracks, and from the tracks themselves. Approximately 345 feet of an unpaved road passes through °the drainage area and 2000 feet of railway lines. There are no paved or roofed areas in this drainage area. Significant Materials/ Controls Significant materials are not stored within this drainage basin, but there is a potential for a spill or leak from railroad activities. Stormwater Outfall 2 Discharge Structure: 24" CMP Location: North of station on railroad tracks Drainage Area: 12.7 acres Area Description This area conveys overflow runoff from the construction laydown area, Boat Club road, and parking areas. This- area also conveys flow,from wooded areas upland of the railroad tracks. A permanent stormwater basin collects, retains, and Allen Steam Station, Gaston County NPDES Permit'No. NC0004979 Page 14 of 26 impedes. most of the water from impermeable areas. There is approximately 4.6 acres of a gravel laydown area. Impermeable areas, include 1000 feet of paved road (Boat Club) and approximately 3,00.0 square feet of roof surface from temporary trailers. Significant Materials/ Controls Construction Laydown Area: Spare equipment, parts, steel, iron, cable, and miscellaneous supplies are stored in a large, flat, gravel laydown area north and upland of the powerhouse. The equipment and .supplies ,generally do not contain liquids. Parking: There is approximately 3,000 square feet of gravel parking within this drainage basin. Stormwater Outfall 3 Discharge Structure: 36" Reinforced Concrete Pipe Location: North of station on railroad tracks Drainage Area: 1.6 acres Area Description This outfall conveys runoff from the railroad tracks. There are about 1500 feet of railway lines. There are no paved or roofed areas in this drainage area. Significant Materials/ Controls Significant materials are not stored within this drainage basin, but there is a potential for a spill or leak from railroad activities. Stormwater Outfall 4 Discharge'Structure: 10" Cast Iron Pipe Location: North of station at Catawba River Drainage Area: 0.4 acres Area Description This small area is southeast of the limestone unloading area. There is a bermed area with trees that separates this drainage area and the limestone unloading area. None of the drainage area is paved or roofed. Significant Materials/ Controls Significant materials are not stored within this drainage basin. Stormwater Outfall 5 Discharge Structure: 18" CMP 'Location: North of station at Catawba River Drainage Area: 7.3 acres Area Description This outfallt conveys overflow runoff from the catchment basins upland of the railroad' tracks and from the tracks themselves. There are also a few temporary Allen Steam Station, GastomCounty NPDES Permit No. NC0004979 Page 15 of -26 construction buildings in this area. About 450 feet of a paved road passes through the drainage area, and there are about 2,580 feet.of railway1ines. Significant Materials/ Controls Parking: There are about 3.2 acres of gravel parking areas within this drainage basin. Laydown Area: Spare equipment, parts, steel, iron, cable, and miscellaneous supplies are stored in a large, flat, gravel laydown area north of the powerhouse. The equipment and supplies generally do not contain liquids. Limestone/ Coal: Potential for a spill or leak from railroad activities. Stormwater Outfall 6 Discharge Structure: 10" Cast Iron Pipe Location: North of station at Catawba River Drainage Area: 0.4 acres Area Description This small area is southeast of the limestone unloading area. There is a bermed area, with trees that separates this drainage area, and the limestone unloading area. None of the drainage area is paved or roofed'. Significant Materials/ Controls Significant materials are not stored within this drainage basin-. Stormwater Outfall 7 Discharge Structure: 18" CMP Location: North of station, at Catawba River Drainage Area: 1 -.5 acres Area Description This area collects stormwater from part of the grassy embankment of the FGD site, but not from the FGD site itself. It also collects runoff from approximately 250 feet of road and 1500 feet of railway. This outfall previously drained part, of the area now known as the limestone sump drainage area, but has been capped off at that location. Significant Materials/ Controls Significant materials are not stored within this drainage basin, but there is a potential for a spill or leak from railroad. activities. Stormwater `Outfall 8 Discharge Structure: 24" CMP Location: North of Station at Catawba River Drainage Area: 4.1 acres Allen Steam Station, Gaston County NPDES Permit No NC0004979 Page 16 of 26 Area Description This outfall conveys runoff from the hill north of the powerhouse. This outfall also conveys runoff from a segment of "railroad tracks and from the laydown area adjacent to the north warehouse. There are approximately 1,000 feet of paved roadways and 2,400 of railroad tracks in this drainage basin. Significant Materials/ Controls Parking: There ,is a gravel parking area at the outage trailers. This lot is, used occasionally during outages. Laydown Area: Spare equipment, parts, steel, iron, cable, and miscellaneous supplies are stored in a large flat, gravel laydown area adjacent to the north field warehouse. The equipment and supplies generally,do not contain liquids. Limestone/ Coal: Potential for a spill ,or leak from railroad activities. Stormwater Outfall ,9 Discharge Structure: 3 feet (') Concrete Ditch Location: North of Intake Structure at Catawba River Drainage Area: 0.4 acres Area Description This outfall conveys drainage from a segment of railroad tracks in front of the powerhouse and from the grassy embankment between the tracks and the intake structure. About 920 feet of railroad tracks pass through this area. There are no paved or roofed areas in this basin. Significant Materials/ Controls Significant materials are not stored within this drainage basin, but there is a potential for a spill or leak from railroad activities. Stormwater Outfall 10 Discharge Structure: 24" CMP Location: South of Intake Structure at Catawba River Drainage Area: 0.9 acres Area Description This outfah conveys runoff from a segment of the railroad tracks in front of the powerhouse and from the grassy embankment between the tracks and the intake structure. About 1,280 feet of railroad tracks pass through this area. There is less than 50 square feet of paved' or roofed areas in this basin. Drainage from the CCW clam filter pit is discharged through "this outfall. Significant Materials/ Controls Significant materials are not stored within this drainage basin, but there is a potential for a spill or leak from railroad activities. Allen Steam Station, Gaston County NPDES Permit No. NC0004979 Page 17 of 26 Stormwater Outfall 11/ NPDES 004 Discharge Structure: 72" CMP Location: East of Coal Pile at Catawba River Control Structure: 65,300 gallon oil trap tank Drainage Area: 15.3 acres Area Description This drainage area comprises most of the southern, end of the station yard, and most of this area is developed. This outfall conveys roof drainage from a portion of the powerhouse roof, the machine shop roof, the service building roof, the warehouse roof, and some of the coal handling buildings. These roofed areas cover about 1.3 acres. Two large paved parking lots cover 3 acres. Other parking and paved' areas cover about 1 acre. About 3,100 feet of rail lines pass, through this drainage area, but only half of them are used regularly,, Runoff from a portion of the transformer yard area and from the entire 115 kV switchyard is routed to a 65,300 gallon oil trap tank prior to being discharged to this outfall. The switchyard is covered with gravel. Other portions of the, drainage area include the powerhouse yard, grassy, and undeveloped areas. About 50 percent of this drainage area is roofed or paved. NPDES discharges including miscellaneous non - contact cooling water from plant equipment, vehicle wash water, and intake screen backwash water are conveyed through this outfall. Significant Materials/ Controls Coal: Coal dust may be present around coal handling areas. Parking: There are about 3.2 acres of paved parking areas within this drainage basin. Laydown Area: Spare equipment, parts; steel, iron, cable, and miscellaneous supplies are stored in a ,flat, concrete laydown yard adjacent ,to the warehouse. The equipment and supplies generally do not contain liquids. Gasoline: There is a 500 - gallon aboveground, carbon steel gasoline tent tank across from the warehouse. The tank is completely enclosed' within a steel tent enclosure, and any leaks would be self contained. The enclosure can be drained by opening a valve, and that valve remains closed at any other time. Any fluid drained from, the tent is captured and' not released to Stormwater Outfall 11. The tank is filled by a 1,500 gallon tanker truck. Clean up supplies are located nearby. Oil: Stormwater runoff from the 115 kV switchyard and from a portion of the station's main transformer yard is routed to the south oil trap tank which has a capacity of 65,300 gallons before. being discharged. Transformers 1A, 1T1,, CT1, 2T1, 2A, and 3T1 contain a total of 34,533 gallons of mineral oil. The largest volume contained by a single transformer is 9 „715 gallons. The oil circuit breakers in the 115 kV switchyard contain a total of 73,229 gallons of mineral oil. Each circuit breaker has three tanks, and each tank contains either 933 or 1,070 AIIen,Steam Station, Gaston County NPDES Permit No NC0004979 Page 18 of 26 gallons of mineral oil, depending on the model. Two transformers at the switchgear house each contain 196 gallons of mineral oil. Stormwater Outfall 12/ NPDES 003 Discharge Structure: 36" CMP Location: Discharge Canal Control Structure: 100,000 gallon oil trap tank Drainage Area: 11.6, Area Description This drainage area includes portions of the powerhouse yard north and west of the station and part of the hill to the north of the station. This drainage basin includes a portion of the station main transformer yard and the 230 kV switchyard. Within the powerhouse, yard, the drainage basin is flat and generally covered with gravel or grass. Approximately 1,400 feet of rail lines have been removed or are not, in service. Less than 5' percent of this drainage area is roofed or paved. Runoff from the powerhouse yard immediately north and west of the station is routed to a 1,00,000 gallon oil' trap tank prior to being discharged to this outfall. Runoff from the ,transformer yard goes to the oil trap tank. Runoff from the 230 kV switchyard is not routed to the north oil trap tank because the switchgear in, the 230 kV switchyard is gas cooled and does not contain oil. NPDES discharges of miscellaneous non - contact cooling water are routed through the north oil ,trap tank and then discharged by this.outfall. Significant Materials/ Controls Ash: Above ground ash pipelines run through this area Carrying ash from the plant to the ash basins. North of the powerhouse; the .ash sluice pipeline is located in a trench; spills would be contained with the trench. Oil: Stormwater runoff from a portion of the station's main transformer yard is routed to the north oil trap tank which has a capacity of 100,000 gallons before being discharged. Transformers 3T2, 3A, 4T1, 4A, 4T2, 5T1, 5T2, 5A, CT2, 6A, and a spare transformer contain a total of 73,158 gallons of mineral oil. The largest volume contained by a single transformer is 13,790 gallons. The largest volume contained by a single transformer is 9,71 "5 gallons. The switchgear in the 230 kV switchyard does not contain oil. Stormwater Outfall Group 13 Discharge Structure: Fourteen 10" CMPs Location: Evey 200 feet along the retired railroad tracks Drainage Area: 13.6 acres Area Description These outfalls are located every 200 feet along the railroad tracks in front of the coal composition products (COP) landfill. These outfalls convey runoff from the railroad tracks and from the CCP landfill embankment. About 7,500 feet of railroad tracks pass through this drainage area. None of this drainage area is paved or roofed. Allen Steam Station, Gaston County NPDES,Pennit No:,NC0004979 Page 19 of 26 Significant Materials/ Controls, Limestone/ Coal: Potential for a spill or leak from railroad activities. Stormwater Outfall 14 Discharge Structure: 21" CMP Location: Catawba River between the coal pile and CCP landfill. Drainage Area: 2.0 acres Area Description This outfall conveys surface, drainage from the area between the embankment at the coal composition products (CCP) landfill and the coal pile. None of the drainage area is paved or roofed. Significant Materials/ Controls Significant materials are not stored within this drainage basin. Stormwater Outfall 15 Discharge Structure: 36" Reinforced Concrete Pipe Location: Catawba River at retired ash basin Drainage Area: 177.8 acres Area Description This is the discharge structure from the structural fills east of the landfill. None of this, drainage area is paved or roofed at this time. This area includes a soil borrow area that is approximately 9.1 acres. Stormwater runoff from the soil borrow area is collected into a temporary sedimentation pond that contains a sedimentation. basin ,skimmer. Stormwater Outfall 15 also includes the new coal composition products (CCP) landfill. Contact water from the CCP landfill 'is not located in this drainage area because it is pumped to the ash basin (see section 2.4 for more information). Only , noncontact water on the CCP Landfill' will fall into this drainage area. Two sedimentation basin skimmers are located in the drainage ditch; and the discharge tower for the outfall is surrounded by riprap .and washed stones. Significant Materials/ Controls Ash: An old ash structural fill' and noncontact water from the new ash landfill ,are located in this drainage area. Stormwater Outfall 16 Discharge Structure:' 36" CMP Location: Discharge Canal Drainage Area: 37.2 acres Area Description This discharge area drains the approximately 1,678 feet of paved road coming into the Allen site. Ash Boulevard will be paved in the future. This modification will allow a paved route from the dry ash handling facility to the CCP landfill in order for trucks to carry dry ash to the CCP 'landfill from the FGD site. Drains by Allen Steam Station, Gaston County NPDES Permit No NC0004979 Page 20 of 26 the intersection of the main road and the road going to the dry ash handling site are surrounded with washed stones and silt fences. Significant Materials/ Controls Ash: Above ground ash sluice lines pass through this drainage area. Trucks carrying ash will pass through this drainage area. Stormwater Outfall Group 17 Discharge Structure: Numerous, 12" CMP Location: Every 170 feet along both sides of the discharge canal Drainage Area: 50 acres Area Description This discharge area drains runoff from the access roads on, either side of the discharge canal. None of this area is paved or roofed. Also there is a perennial stream north of the FGD site that drains into the discharge canal through ,a 36" pipe. A temporary stormwater basin currently receives runoff from most of the permeable surface of the FGD site. When construction ends the temporary stormwater basin will be removed, and most of the, permeable surface at the site will once again drain to the stream. Significant'Materials/ Controls Significant materials are not stored within'this drainage basin. 3.4.1 Sump System At Allen Steam Station, there are six main sumps that use pumps to discharge into the ash basin. They are referred to as the following: landfill (leachate) sump, FGD stormwater sump, powerhouse yard sump, yard drainage sump, limestone drainage area sump, and the coal yard sump. The landfill sump is located south of the coal pile in the CCP landfill. The FGD stormwater sump is located north of the plant and west of the FGD absorber building. The powerhouse yard sump is located east of the powerhouse, at the north end. The powerhouse yard sump discharges to the yard drainage sump. The yard drainage sump is located east of the coal pile and adjacent to the coal yard sump. FGD Stormwater Sump Drainage Area Location: North of powerhouse Drainage Area: 25.6 acres Area Description This drainage area 'includes the dry ash handling facility, gypsum, pile, WWTS area (not ,process water), stack, absorbers, switchgear building, dewatering building, reagent prep building, and the control room. Most of the FGD site drainage area is routed to a permanent stormwater basin (that has ,a 30 foot spillway) and pumped to the ash basin through the FGD stormwater sump. Most of the dry ash handling area is surrounded with a concrete curb. Stormwater Allen Steam,Stabon, Gaston County NPDES "Permit No. NC0004979 Page "21 of 26 from this area is routed to the permanent stormwater detention basin. There is an oil water separator (OWS) tank buried into the ground outside of the dewatering 'building that receives runoff from two transformers (T1 and T2) in the FGD area. The OWS separates the oil from the water before it is enters the permanent stormwater basin Significant Materials/ Controls Gypsum: Gypsum is stockpiled here. A contractor hauls off the gypsum and uses it to make wallboard. A paved area outlines the gypsum pile, and, a concrete stormwater trench is located on the farthest edge of the gypsum area and drains to the permanent stormwater basin, and then to the FGD sump. Ash: Ash is transported via pressureized lines to a collection silo. The ash is then gravity fed into trucks which transport the material in the CCP landfill. The floor drains and stormwater runoff are pumped to the permanent stormwater basin. Oil: 'Runoff from two new auxiliary transformers contains 2,908 gallons of mineral, oil a piece. Stormwater runoff is routed to an oil trap tank before entering into the permanent stormwater basin. Runoff from two other new transformers (T1 from the 230 W and T2 from the 115 W) is routed to the permanent stormwater basin. Transformers T1 and T2 contain, 5,850 and 8,670 gallons of mineral oil, respectfully. All transformers, are surrounded by gravel in a concrete containment area and the valves to drain the containment area remain closed most of the time. Also, there are diesel tanks located in the diesel fire pump enclosure. Chemicals: Organic acid is unloaded and stored in this drainage area. There is a 21,500 gallon tank of organic acid located in a secondary containment area inside the reagent prep building. There are various tanks of varying concentration of limestone slurry. 2,255 pounds (approximately 260 gallons) of dibasic acid will be located inside the reagent prep building in a secondary containment area. Limestone Sump Drainage,Area Location: Northeast of powerhouse Drainage Area: 6.0,acres Area Description This area is an extremely flat area where limestone is unloaded, piled, and conveyed to the FGD site. Approximately 10,000 square feet is roofed. 1,00 feet of railroad tracks pass through this drainage area. A new bermed area with trees outlines the northeastern edge of the area. A 350 foot permanent stormwater collection trench (with a 10 foot spillway) is located at the eastern edge of the area and conveys most of the stormwater runoff from the site into' the ash basin: Significant Materials[ Controls Allen Steam Station, Gaston County NPDES Permit No. NC0004979 Page 22 of 26 Limestone: Limestone is stockpiled here. A limestone unloading building and limestone convey belts and hoppers operate in this area. Powerhouse Yard Sump Drainage Area Location: East of the powerhouse, at the north ,end Drainage Area: 3.6 acres Area Description Industrial wastewater from unit five flows into the powerhouse yard' sump. Stormwater runoff from a portion of the powerhouse roof, the plant yard, the fuel, oil unloading area, and the bulk fuel oil tank area drains to the powerhouse yard sump. The portion of the powerhouse roof that drains to the powerhouse sump is about 2.2 acres. About 85 percent of this drainage basin is paved or roofed. Overflow from the powerhouse yard sump would spill to the ground and then flow overland and could eventually reach the Catawba River. Overflow from the powerhouse yard sump is permitted, as NPDES Outfall 2(b). Overflow from the powerhouse yard sump is not a normal occurrence. Significant Materials/ Controls Oil: The fuel oil bulk storage tank is an aboveground, galvanized steel cylinder surrounded by a concrete containment ,sufficient in height to contain a total spill plus rainfall. The total tank capacity is 100,000 gallons. There is a catch basin inside the berm. This outlet has a valve which is normally, closed. The stormwater is inspected for the presence ,of oil, and if `it is clean, it can be drained if there is significant standing water. In the fuel, oil unloading area, fuel is transferred from an 8,000 gallon tanker truck to the bulk storage tank via pipelines. DOT unloading procedures are followed. The fuel oil unloading area is paved and surrounded by a one foot concrete curb and ramps to contain any spill's. 'There is a small sump to drain rainfall; ,the ,sump has a valve which is normally closed. Spill clean -up supplies are located nearby. Piping from the unloading area to the bulk fuel oil tank is aboveground or enclosed in a concrete trench. The 48 transformers for the Units 1 -5 precipitators contain a total of 7,560 gallons of mineral oil. About 60% of the precipitator transformers are located within this drainage area. The maximum oil content of any single component is 205 gallons. Wastewater: Plant wastewater from equipment discharges, floor drains, sumps, etc. is routed to the powerhouse yard sump. This wastewater may include oil, chemical, and hazardous waste spills. Yard Sump Drainage Area Location: East of the coal pile Drainage Area: 5.2 acres Area Description The powerhouse yard sump discharges 'to the yard drainage sump. The yard drainage sump discharges to the ash basin. In addition to the discharge from the powerhouse yard sump, the yard drainage sump receives industrial wastewater Allen Steam Station, Gaston County NPDES'Permit No NC0004979� 'Page 23 of 26 from some of the powerhouse sumps: Industrial wastewater includes effluent from the turbine room sumps and boiler room sumps. Stormwater runoff from a portion of the plant yard and parts of coal handling drains to the yard drainage sump. The total roofed area in this basin is about 1.5 acres including the warehouse roof, the maintenance garage roof, and a portion of the powerhouse roof. About half of this drainage basin is paved or roofed. Approximately 1,300 feet of railroad tracks pass through this drainage, area. Overflow from the yard drainage sump would discharge to the coal yard sump. Overflow from the sump is not a normal' occurrence. Significant Materials/ Controls (See description for powerhouse yard sump for additional' information) Kerosene: There is a 200 - gallon aboveground, carbon steel kerosene tank above the ash sluice trench. Oil: Used oil is stored in a 4,500 gallon steel tank. The tank is surrounded by a steel containment dike about five feet tall, and the piping is surrounded by a 6- inch concrete curb. Rainfall that accumulates inside the dike can, be drained by opening a valve that drains to the ash trench which leads to the yard drainage sump. When the-used oil tank is full, the product is removed from site by tanker truck. Small quantities of used oil are initially poured into 55- gallons drums. The drums are stored in the used oil staging area under cover, adjacent to the warehouse, for temporary storage. When the drums are full, they are 'emptied into the used oil tank. Empty oil drums are stored outside, adjacent to the boat shed. Approximately 250 gallons of oil are stored inside the maintenance garage where floor drains flow to the yard drainage sump. The 48 transformers for the Units 1 -5 precipitators contain a total of 7,560 gallons of mineral oil. About 40% of the precipitator transformers are located within this drainage area. The maximum oil content of any single component is 205 gallons. Two transformers associated with the wastewater and coal yard sumps each contain 270 gallons of mineral oil. Fuel oil dispensers for the locomotives and bulldozers are located adjacent to the maintenance garage. Wastewater: Plant wastewater from equipment discharges, floor drains, sumps, etc. is routed to the yard drainage sump. This wastewater may 'include oil, chemical, and hazardous waste spills. Coal: Coal dust is present along the railroad tracks and coal handling areas. Ash: Ash pipelines run through this drainage area. Chemicals: There is a 5,000 gallon tank of sulfuric acid located adjacent to the warehouse. The tank is surrounded by a concrete dike with an outlet to the ash line trench which leads to the yard drainage sump. Drums of various chemicals are stored inside a covered, locked shed adjacent to the warehouse. Hazardous Waste / Satellite Accumulation Areas: There is a satellite accumulation area, for waste paint, chemicals, solvents, cleaners, etc. adjacent to Allen Stearn Station, Gaston County NPDES Permit No NC0004979 Page 24 of 26 the paint warehouse. Hazardous wastes are stored in a covered area adjacent to the maintenance garage. L-aydown Area: There is a large laydown area adjacent to the warehouse. The area is paved and fenced. Spare equipment ,and parts are stored in the laydown area. Coal Yard Sump Drainage Area Location: East of the coal pile Drainage Area: 24.1 acres Area Description The coal yard sump receives, stormwater runoff from the coal pile and from parts of coal handling area. Less than one percent of this drainage basin is paved or roofed. Approximately 800 feet of railroad tracks, pass through this drainage area. Overflow from the coal yard sump would be conveyed to the Catawba River. Overflow from the coal yard sump is, permitted as NPDES Outfall 002a. Overflow from the sump is not a normal occurrence. Significant Materials/ Controls Oil: Two transformers associated with the wastewater and coal yard sumps each contain 270 gallons of mineral oil. A fuel oil dispenser for the bulldozers is located in the northwest corner of the smaller coal pile. Coal: Runoff from the, coal pile and some coal handling areas is routed to the coal yard sump. Wastewater: Effluent from the septic system goes to coal yard sump. CCP Landfill Sump 'Drainage Area Location: South of the coal _pile Drainage Area: 64:0 acres Area Description The coal combustion products (CCP) landfill is double lined with a leak detection system and leachate collection system. The contact water from the leachate collection system will be pumped from the CCP landfill into the ash basin. There is a 30 foot dike around the landfill. A stormwater drainage trench runs along the south side of the landfill currently and is part of outfall 15. In the future, there will be drainage ditches east and west of the landfill that will collect stormwater runoff and pipe it to the ash basin. Significant'Matetials/ Controls Ash: Leachate from the CCP Landfill Allen Steam Station, Gaston County NPDES Permit No NC0004979 Page 25 of'26 3.5 Similarity of Storm Water Outfalls at Allen Steam Station Monitoring all of the storm water outfalls ,at Allen Steam Station should not be necessay since many of the outfalls convey storm water from areas of substantially identical activities and materials. Storm water outfalls 8 and 15 are representative for the entire site. 4.0 Hazardous and Toxic Substances 4.1 Hazardous and Toxic Substances Table 2c- 3 At Plant Allen, the potential for toxic and hazardous substances being discharged is very low. In reference to Item V -D of Form 2 -C, the substances identified under Table 2c -3 that may be in the discharge are as follows: Acetaldehyde, Asbestos, Butyl Acetate, Cyclohexane, Diuron, Epichlorohydrin, Formaldehyde, Monoethyl Amine, .Propylene Oxide, Pyrethrins, Vinyl Acetate, and Xylene. Other - During the course ,of the year products such as commercial cleaners and laboratory reagents may be purchased which contain very low levels of a substance found iin Table, 2c -3. It is not anticipated that these products will impact the ash basin's capacity to comply with its toxicity limits, since their concentrations are extremely low. 4.2 40 CFR 117 and CERCLA Hazardous Substances The following table identifies hazardous substances located on -site that.may be released to the ash basin during a spill in quantities equal to or greater than the reportable quantity,(RQ) levels as referenced in 40 CFR 117, 302 and 355. This list is being provided 'in order to qualify for the spill reportability exemption provided under 40 CFR 117 and the Comprehensive Environmental Response Compensation and Liability Act ( CERCLA). These values below represent the maximum quantities on -site that could be released at one time and sent to the ash basin. They do not reflect quantities that are; discharged through typical use. Allen Steam Station Hazardous Substances in Excess of RQ Table 4.2 SUBSTANCE QUANTITY SOURCE Benzene 83 Ibs Gasoline Tank Eth (benzene 2,737 lbs Diesel Fuel Tanks Hydrazine 499lbs Warehouse Naphthalene _ 41,700 lbs Fuel Oil Tanks Sodium Hydroxide 1;,181 lbs Ash basin/Warehouse /#3 Fan Room Sodium Nitrite 800 lbs Warehouse /Powerhouse Sulfuric acid 44,277 lbs Powerhouse X lene Mixed Isomers 419 lbs Gas Tank AIIen SteamrStation, Gaston County, NPDES Permit No NC0004979 Page 26,of 26 5.0 Allen Steam Station 316 Determination 5.1 Allen Steam, Station, 31,6(a) determination Duke Energy's 316(a) demonstration (March 1976) concluded that the "heated discharge from Plant.Allen is such that the protection and propagation of a balanced indigenous aquatic community in and on Lake Wylie is assured." Duke's operation experience during the past'five years under the thermal limitations imposed in NPDES Permit No. NC0004979 substantiates the above conclusion and further supports Duke's belief that-the operating characteristics of the station have a minimal effect of the aquatic environment of Lake Wylie. Surveys of the aquatic community in Lake, Wylie demonstrate that a Balanced Indigenous Population exists in Lake Wylie. Accordingly, Duke requests a 316(a) variance and further'requests that-the thermal limitations imposed in the permit be continued. 5.2 Allen Steam Station 316(b) Determination In conjunction with the rulemaking process for the new Phase II 316(b) rule pertaining to fish impingement and entrainment, historical data and permitting records were reviewed. Initial 316(a) and 316(b) studies associated with enactment of the Clean Water Act concluded that the location, construction capacity, and design of 'the cooling water intake of Allen and other Duke Power steam stations were not detrimental to 'the aquatic ecosystem and minimize adverse environmental impacts. Both North Carolina and' EPA regulators concurred in 1976 that 316(b) fish impingement and entrainment studies were no longer needed at that time. Although the new, Phase 11 316(b) rule for existing facilities is currently being litigated, plans for information collection (PICs) are being developed to conduct 'a Comprehensive Demonstration Study (CDS,) to determine required measures to be implemented per approval of NCDENR f Vinzani, Gil From- Vinzani, Gil Sent. Moriday, April 26, 2010 8 12 AM To: 'Stowe, Allen' Subject: RE 'Allen'Steam Station NPDES Perm it.(NC0004979) Thanks, Allen I will add this to the file Gil Gil Vinzani, P— E. NP ®ES Program 919 -807 -6395 E -mail correspondence to and from this address may be subject to the NC Public Records Act From: Stowe, Allen [mailto:Allen.Stowe @duke - energy.com] Sent: Monday, April 26, 2010 7:20 AM To: Vinzani, Gil' Subject: Allen Steam Station'NPDES Permit (NC0004979) Gil, I wanted to provide you with this supplemental information regarding'the dike seepage at Allen Steam Station This information was supposed to be included with the Allen NPDES renewal application Please contact me if there are any questions or comments Thanks Ash Basin Toe Drains — In order to ensure the integrity of the dike structure of the ash ba "sin, the dikes are designed with a system that allows for water to be drained from the dike This drainage system prevents the dikes from becoming overly saturated with water This, water seeps out of the dikes via toe drains This seepage flow rate'is nominal 'This water discharges to the ground, is dispersed by rip -"rap and other'means, and ultimately migrates to the Catawba River Allen Stowe EHS Water Management Duke Energy'Carolinas Allen Stowe(@duke- enerev com 704 - 382 -4309 (Office) 704 - 516 -5548 (Cell) Please print or type In the unshaded areas only Form Approved OMB No 2040 -0086 FORM U S ENVIRONMENTAL PROTECTION AGENCY I EPA I'D NUMBER 1 �+ a GENERAL INFORMATION \�� ��^ a F Consolidated Permits Program NC 0 0 04 9 7 9 p GENERAL (Read the " Gene rallnstructions "before starting) 1 z 13 ,. 1 is ; GENERAL INSTRUCTIONS 9« ° LABEL ITEMS K, t label I.r ;. „EE;;:, >" If a preprinted has been provided, affix It In the '::';5ii".': "; �'�i�*aa';;;.y '� ° "„ designated space Review the information carefully,, an of k i£.. ..e cc;sar:.vz,c�'a�a:i.l rv,ri g sva y y r s.. .. r "rrE `: 11MBER'r b:z .ac is Incorrect ,,cross through d and enter the correct data m the : ^s;' - •;sa' :„ ea;,.,"'^j "" e €:?., ' : ,: w xie)�x.. -- .c:tc.;:i.: appropriate filNn area below Also. n an a the preprinted data pnc ' Y Pre0 ef is absent (the area to the left of the label apace lists vie -M'`` mrormhon that should a ar please,pnivide d in the proper $G':": "r- i ). #+` k ' az �:# ^ • ° tr s �; "sg ill :ern. "41,: r.a ;c filbin areas) below If the label is ciimplete,and +correct you I V:�s�'„FACII7I�Y INAi Gt €; m)($ Vii'! • ";"9„ �,(,' s �'.:<~�'��l�����:: }'"'_ "" 11% ,rn need not 9, canpletelltems 1, III, V. and VI (except Vr-B which Sr�C;3..- ' NO nom ^ must be completed,regsrdless) Complete all items,tf no label has been provided Refer to the instructions for detailed item •;� 1"S � a e' , descriptions and for the legal, authorizations'under which thi's :tie .0 .��;�'•� �., � �.v.� ,r*; ,�d�,, `Ls --E AC LITY LOCATION l %' a F :z �i rNN .; NN oats is collected vRE+.v �.. '`FEasxc:'*,.?xatts^° Est, a:'�`•,�:�r_«.sa ^5?saC..ar�.z. ::t II POLLUTANT CHARACTERISTICS INSTRUCTIONS Complete A through J to determine whether you need to submit any permit application forms,to the EPA If you answer yes" to any questions, you must submit this form and the supplemental form listed In the parenthesis following the question Mark 'X* In the box In the third column If the,supplemental form Is attached If you answer 'no* to each question, you need not submit any ofthese forms You may answer "no" d,your activity is excluded from permit requirements, see Sechon'C of the Instructions See also, Sechoml) of.the Instructions for definitions Dfbold -faced terms ` Mark 'X Mark 'X' YES _ _ NO FORM ATTACHED YES NO FORM ATTACHED SPECIFIC QUESTIONS SPECIFIC QUESTIONS A Is this facility a publicly owned treatment works which results In a discharge,to waters of the U.S.? (FORM 2A) X B Does or will this facility (either wasting or proposed) Include a concentrated animal feeding operation or X aquatic animal production facility which results In a ,s n is is m z, discharge to waters of the U.S.? (FORM'2B) IC Is this•a facility which currently results do,'discharges to waters of the U.S. other than those�descnbed In A,or B �/ X �/ x D , Is this ,a proposed facility (other than those described m A Or above) whlch'wlll resultdin a discharge to waters-of " n above? (FORM'2C) 23 24 the U.S.? (FORM,2D) 1 25 -m_ r E Does or will this facility treat; store, or dispose of F Do you or will you Inject at this facility Industrial or hazardous wastes? (FORM 3) X municipal effluent below the lowermost stratum X containing, within one quarter mile of the well bore, underground sources of dnniong water? (FORM 4) 31 32 33 m 30 G Do you or will you, inject at this facility any produced water H , Do you or will you Inject at ,this facility fluids for special or other fluids which 'are brought to the surface In X processes suchlas mxning,of sulfur'by the Frasch process, fossil connection with convenbonal,oil or natural gas production, solution mining of minerals, in Isitu combustion, of X Inject fluids used for enhanced recovery of oil or natural fuel, or recovery of geothermal energy? (FORM 4) gas, or Inject fluids for storage of liquid hydrocarbons? (FORM 4) >r s 36 37 38 39 1 Is this facility a proposed,stationary source which Is one J Is this facility a proposed stationary source which Is of the 28 Industrial categories listed In the Instructions and �/ x NOT one of the 28 Industrial categories listed In the x which will potentially emit 100 tons per year of any air pollutant regulated under the Clean Air Act and may affect Instructions and which will potentially emrt;250 tons per year of any air pollutant regulated under the Clean Air Ad 40 41 42 10 « u or be located Inlan attainment area ?, (FORM 5) and may affect or lie ' located In an attainment' area? (FORMS) III NAME OF FACILITY ' c 1 SKI,' I A 'len Steam Station b sa IV FACILITY CONTACT, A NAME & TITLE (last, first, &,stile) B PHONE (ale& code & no) �.v c 2 S owe, 1 en Env. Pc. 'I I ( 0) 3 2 -4 0 is to B 4s a sa 61 52- as V FACILTY MAILING ADDRESS A STREET OR P O'BOX) J 3 P.O. Ox 1006, ail Jo 4e E 13K ,s ,s 45 B CITY OR TOWN C STATE_ D ZIP CODE ' c Charlotte C 2 2 1' 1s is 40 41 42 47 51 VI FACILITY LOCATION A STREET, ROUTE NO OR OTHERSPECIFIC IDENTIFIER' 5 2 3 P ant A len Road' 15 10 45 B COUNTY NAME' ' Gaston + a u 70 C CITY OR TOWN D ,STATE E ZIP CODE F COUNTY CODE'(ufknown) 6 B l o t C 2 012 ; ,g ,s so ., n 47 s1 R as EPA Form 3510 -1 (8-90) CONTINUE ON REVERSE CONTINUED FROM THE FRONT VII SIC CODES 4-d tt, to order of non A FIRST — B SECOND ry(�p�e (specify) 7 1 4911 18 t9 elec�)ic Services 7 / t8 1 —_ C THIRD D FOURTH - -1 y) (specify) 1�7 1 6 m 1 1n 19 t�nou •rtnu A NAME _ B Is the nine listed in Item c VIII -A also the owner? e Duke Energy Carolinas, LLC (Attention: Allen Stowe) ®YES ❑ NO C STATUS OF OPERATOR (Enter the appropriate letter Into the answer, box !f "Other," specify) D PHONE (area code & no) ,Fl= ',FEDERAL (s city) M,= PUBLIC (otherthanfederol or state) electric Utility S= STATE 'O= ,OTHER'(spec�fy) P Y Ai (704) 382 -4309 P = PRIVATE 66 16 is 16t 1 19 21 F22 26 E STREET OR P'O BOX�s'� P.O. ox 100 Ma'i Code C 3 F CITY OR TOWN G STATE H ZIP CODE IX INDIAN LAND JW !C harlotte Is the facility located on Indian lands? L Ij NC 28201 O YES ®;NO s 16 47 - 1 X EXISTING ENVIRONMENTAL PERMITS A NPDES 2schar s to Sur ace Water D PSD (Air Fr7rustons Pro ed Sources t 4" C T 1 e r 1 d 9 ,N NC0004979 g P� to 1e 17 1e 30 X16 19 I t7 I 19 B UIC, Under and /nentono 2mds E OTHER s c1 c T c T i 9 U 9 0 7 7 33/ C 010000 (Zs cr�� it /General Stor ater 1s 1e n 18 3o ns, is v 1e 30 C RCRA Haxardous,Wastes E OTHER` s c1 0 T 1 0 T I" 9 'R NCD043678937 g WQ0000452/36 -12 distribution of Residual Solids Permit /Industrial Land£ill_Permit 16 18 17 10 30 '15 161 mile 30 XI MAP Attach to this appllcatioma topographic map of1he area extending to,at least one mile beyond property boundaries Thwmap must show,the,ougtne of the+faaldy, the location of +each of its existing andiproposed intake and,, dscharge�structures „each of Its hazardous waste treatment,�storage „or disposal facilities „ and, each well where'd injects fluids underground Include all springs, rivers, and other surface water bodies'm the map area -See instructions for prease,repuirements XII NATURE OF BUSINESS,(prowde a bnef descrrphon Coal fired electric generation XIII ,CERTIFICATION (see instructions) I certify under penalty of law that I have personally examined and am familiar with the tnformahon subautted to this application and all attachments and that based on my ,inquiry of those persons Immediately responsible for obtaining thevnformstron contained tn, the application, Ihbeheve that the mformabonds true, accurate, and complete I am,a "ware that there are significant penalties for submitting false information, including the possibility of fine and tmpasonment A NAME & OFFICIAL TITLE (type or print) B SIGNATU E I C DATE SIGNED Steve Immel - General Manager II, Regulated Fossil Stations 11/30/2009 COMMENTS FOR OFFICIAL 'USE ONLY jCC EPA Form 3510- 1(B -90) EPA I D NUMBER (copyfrom Item I oJForm 1) Form Approved Please Door or tvce N00004979 OMB No 2040 - 086 in the unshaded areas only Approval expires 0 3 -31 -98 FORM 12C NPDES US ENVIRONMENTAL PROTECTION AGENCY ,FOR ti &EPA EXISTIN&MANUFACTURING, OMMERCIAL MINING AND SILVICULTURE OPERATIONS Consolidated Permits Program I OUTFALL LOCATION For each outfall, list the latitude and longitude of its location to the nearest 15 seconds and the name of the receiving water A OUTFALL NUMBER 01st) B LATITUDE C LONGITUDE D RECEIVING WATER (name) t DEG 2 MIN 3 SEC 1 DEG 2 MIN 3_ SEC 001 35, 11 '22 81 00 441 South Fork River 002 35 10 30 81 00 20 Catawba River 002A /002B 35/35 11/11 13/25' 81 /81 00 /00 21/28 Catawba River (Intermittent) 003 35 11 23 81 00 45 South Fork River 004/005 35/35 11/09 13/60 81/81 00 /01+ 21/22 Catawba River /Internal Outfall II FLOWS, SOURCES OF, POLLUTION, AND,,TREATMENT TECHNOLOGIES A Attach' a line drawing showing the water flow through the facility Indicate sources of Intake water, operations contributing wastewater to the effluent, and treatment units labeled to correspond to the more detailed descriptions In Item B Construct'a water,balance on the line dr wmg by'showing average flows between intakes, operations, treatment units, and outfalls if a water balance cannot be determined (e g, for certain mining activities), provide a pictorial description of,the nature and amount of any sources of water and any collection or treatment measures B For,eaeh outfall, provide a description of (1) All operations ooidnbuting wastewater to the - effluent, Including psrocass wastewater,.sanddry wastewater, cooling water, and storm water runoff, (2) The average flow contributed by each operation, and (3) The treatment received by the wastewater Continue on additional sheets it necessary 1 OUT- 2 OPERATION(S) CONTRI- BUTINGFLOW 3 TREATMENT FALL NO (1ts1) a OPERATION (list) b AVERAGE FLOW (include units) a DESCRIPTION b LIST CODES FROM TABLE_ 2_C_ -1' 001 Condenser Cooling Water _ 649 4 MGD Screen discharge to surface water 1T (once-through non - contact) 9A includes intake screen backwash 002 Ash basin discharge 16 6�MGD chemical coagulation, settling, neutralization, 2D 2K ion exchange, surface water discharge lU 21 4A 002A Emergency Overflow of yard drain Intermittent surface water discharge aA 002B sump #1 (002A) and sunp #2 (002B) See supplemental information 003 Miscellaneous once through q 5'MGD surface water discharge aA non- contact cooling water 004 Miscellaneous once through 6 5 MGD surface water discharge 4A non - contact cooling water surface water discharge 4A 005 Flue Gas Desulfurization 0 5 MGD Internal outfall, discharges to ash basin 1R 2L wastewater Treatment System 2C 3C 2D 5C 2K OFFICIAL USE, ONLY, (effluent guidelines sub - categories) EPA Form 3510 -2C (8-90) nira PAGE 1 of 4 CONTINUE ON REVERSE C Except for storm runoff, leaks, or spills, are anyof the discharges described In Items II -A or B Intermittent or seasonal? © YES (complete the following table) ❑ NO (go to Section Iln 3 FREQUENCY _ _ 4 FLOW ,a DAYS PER B TOTAL VOLUME 2 OPERATION(s) WEEK b MONTHS a'FLOW RATE (in mgd) (spec (& with units) 1 LONGTERM 2 MAXIMUM 1 LONGTERM 2 MAXIMUM 1 OUTFALL CONTRIBUTING FLOW (specify PER YEAR C DURATION (in days) NUMBER (list) (list) . -rage) (specify average), AVERAGE DAILY AVERAGE' DAILY 002A, i,Emergency overflow of yard drain,sump See See See 'Supple- See 41 (see supplmental information) Supple- „Supple- Supple- mental mental mental mental Informat- Informat- 'Informat- Informat ion ion ion -ion 002E Emergency overflow of yard drain sump See See See See q2 (see supplmental information) Supple- Supple- Supple- Supple- mental mental mental mental Informat- Informat- Informat- Informat ion ion ion -ion III PRODUCTION A Does an effluent guideline limitation promulgated by EPA under Section, 304 of the Clean Water Act apply to your facility? ®'YES,(complete hem 111 -B) ❑ NO (go to Section 10 B Are the limitations In the, applicable effluent,guldellno expressed In terms, of production (or other measure of operation)? ❑ YES (complete Item 111 -0 _ m NO (go to Section Ili C .If�ybwbnswered "yes" todtem III- B,dllst the quantity'Whlcharepresdnts an actual measurement of yourd level of production, expressed In the terms and units used;m the applicable effluent guideline, and Indlcate,the affected outfalls 1 AVERAGE'DAILY'PRODUCTION 2 AFFECTED OUTFALLS (lisfoulfall numbers) a OPERATION, PRODUCT, MATERIAL, ETC a QUANTITY'PER DAY b UNITS OF MEASURE (specify) NA NA NA NA IV IMPROVEMENTS A Are you now required by any Federal, State or local authority to meet any Implementation schedule for the construction, upgrading or operations oVwastewater treatment equipment or practices or any other environmental programs which may affect the discharges described imthis application ?.This Includes, but is not Ilmlted'to, conditions, administrative or enforcement orders, enforcement compliance schedule letters, stipulations, court orders, and grant or loan conditions permit ❑ YES (complete the following table) NO (go to Item IV -B) 1 .IDENTIFICATION OF CONDITION, 2 AFFECTED OUTFALLS 3 BRIEF DESCRIPTION'OF PROJECT 4 FINAL COMPLIANCE DATE AGREEMENT, ETC e NO b SOURCE'OF DISCHARGE a REQUIRED b PROJECTED B OPTIONAL You may attach additional sheets describing any additional water pollution control programs (or other'envvironmental projects which may affect your discharges) you now have underway or which,you plan Indicate whether each program Is now underway +or planned, and Indicate your actual or planned schedules for construction ❑ MARK "X" IF DESCRIPTION OF ADDITIONAL CONTROL PROGRAMS IS ATTACHED EPA Form 3510 -2C ( 8-90) PAGE 2 of 4 CONTINUE ON PAGE 3 EPA I D NUMBER (copyjrom Item 1 ofform 1) CONTINUED FROM PAGE 2 NC0004`987 V INTAKE AND'EFFLUENT CHARACTERISTICS A, B, & C See instructions before prdcee ing — Complete dne seGof tables for each outfall —,Annotate the outfall number in the space provided `through NOTE Tables V -A, V -B, and V -C are included oniseparate sheets numbered V -1 V -9 D Use,the space below to list any,of the pollutants listed in Table 2o-3 of the instructions „which,you know or have reason to,believe Is discharged`or may be discharged from any outfall For every pollutant you list, briefly describe the reasons you bellevedt to be'present and report any analytical data,ln your possession 1 POLLUTANT 2 SOURCE 1 POLLUTANT 2 SOURCE See Supplemental Information, Table 5 1 (attached) for complete list VI POTENTIAL DISCHARGES NOT COVERED BY ANALYSIS Is any pollutant listed Inlltem,V -C a substance or a component of,a substance which you currently use or manufacture as an intermediate or final product or byproduct? ❑ YES (Grt aB such pollutants below) NO (go w Item!VI -B) EPA Form 3510 -2C (8-90) PAGE 3 of 4 CONTINUE ON REVERSE CONTINUED FROM THE FRONT EPA Form 3510 -2C (8 -90) PAGE 4 of 4 VII BIOLOGICAL TOXICITY TESTING -DATA Do you have any knowledge orreason to tielieve that any biological test for'acute or chronic toxicity hasIbeen made on any of your discharges or on a recewing,water in relation to your discharge within the last 3 years? © YES (identify the test(s) and describe their purposes below) Eli NO (go to Section VIII) Quarterly analysis of Ceriodaphnl.a Dubia chronic testing per current permit requirements on Outfall 002 VIII CONTRACT ANALYSIS INFORMATION Were any of the analyses reported,m Item V performed bpa contract laboratory or consulting firm? ® YES (list the.name, address, and telephone number of and pollutants analyzed by, Q NO (go'to Section IA) each such laboratory orfirm below) A NAME B ADDRESS C TELEPHONE D POLLUTANTS ANALYZED (area code & no) (list) Shealy Environmental 106 vantage Point Drive 803- 791 -9700 All parameters except Services,Inc West Columbia, SC 29172 dioxin and radiological �SGS Environmental Services, Inc, 5500 Business Dr ,910- 350 -1903 Dioxin Wilmington, NC 28405 GEL Laboratories LLC 2040 Savage Road 843 -556 -8171 Radiological Charleston, SC 29417 IX CERTIFICATION MM 1 certify under penalty, of law that this document and all, attachments were prepared under my direction or supervisiomin accordance with'a'system designed to assure that qualified personnel property gather and evaluate the information submitted Based on my, inquiry of'the person or persons who manage the system or those. persons directly responsible for gathering the information, the, information submitted is, to the best of my knowledge and belief, true, accurate, and co_ mplete I am aware that there are significant penalties for submitting false information„ includmg,the possibility of fine and imprisonment for knowing violations A ,NAME & OFFICIAL TITLE (type or print) B, PHONE NO (area code & no) Steve Immel, General Manager II, Regulated'Fossil Stations (704) 829 -2400 C SIGNATURE DIDATE SIGNED 11/30/2009 EPA Form 3510 -2C (8 -90) PAGE 4 of 4 CO Cn O> O> z� zI a¢ aQ _ W _ W ¢ ¢ r «> ^ E E 0 1yj vV v v Lfj j vV v v v Z 4) ¢ � am Y Q� a' 2+' Z W O n 0 O n W C Z w c N Q O N N m C Q J. m R a) � c N O 0 �, 5 N L (D c O O= N N O O as W ¢ z w w w M z O ° v v V j ; c E O U V IV V V L C $ o p m o 0 0 " z °�' o � Z a N m'�,c a � a F y - - - - - , F - - - - Z a W W = T =(D Z a O m D 'U U v O m c c C iC c t Cl) W mu cr E g E 0 0 E E E E E i (7 w (7 w < w g E E c3° E E = 0 m` O N 'y p m b to LL W E rn m U) w ''L W m>t d c' m Q OO 0 U) C J N w ° y N N(D m J �- U O v zz n p a o �, O zz z 2 'aa o N.3 a cc o¢ W co c Dn g D d c m 10 0 Lli to z z _ Q Q. 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LL ui w D z Z 0 U N 0 C N U a w U) °} z z aQ i w C -> J so w Q F � Z a W o Ln W z IV 0 0 J U l0 N N � T A N {7 T R Z � v t r U m m b LL W 0 CO z Z aQ i W Q > m L > N Q W - °- u F s W z n °u t O o J U U � W Q 4F Q � 0 LU J m c LL B w LL W �_ m CO N Y b v U w O O O O O O O O O O O O O O Q N > W JN V V V V V V V 0 N N N N N N N O O O O O O O O M ra 2 N Y U 7 C U .-. �p 8 V V V V V V V l0 .X m ° tow X X Y _ U cr ° `mN U) w (L N a X X X X X X X 3 a m o u z O F z0 z H U aa � Y J Q n J LL " N S N (b U N rb d ab 'b ab m Gb al 0 0> Z N L) n p a ♦ gyp m i[il a I a g 0 a r s ^p n n r� O N 0 C N U a w Please print or type in the unshaded areas EPA ID Number (copy from item l of Form 1) NCO604979 Form Approved. OMB'No 2040-0086 Approval expires 5 -31 -92 Form,, 2F NPDES�+,r - United States Environmental Protection Agency _.� . - T ... x • ; ; Washington, DC 20460 ` '``''' Application for Permit to Discharge Storm Water r4 a ��'�. .��e :� �,..i Discharges Associated with Industrial Activity Paperwork Reduction Act Notice Public repatrg burden for this appficabon is estimated to average 2116 hours per application, including time for reviewing irstrucliors, seamhmg existing data sources, gathering and maintaining the data needed „and eompletiM and revieWrg the election of information. Send comments mgadM the burden estimate, any other aspect of this eollection,of irrbmation or, suggesbo s for ImpiuwVdhs form, lndudirg suggestions winch may increase or reduoa,this burden to: Chef, InIbimalion Policy Brand), PM• 223, U.S. Environmental Pmtedon Agency, 401 M St, SW, Washingbi% DC 20460, or Direct, Office of Irdormation and Regulatory Affairs, Office of and Budget W DC 20503. I. Dutfall Location For each outfall, list the latitude and longitude of its location to the nearest 15 seconds and the,name of the receiving water. A. Outfall Number list B. Latitude C. Longitude D. Receiving Water name SW 008 35 11 25 81 00 28 Catawba River SW 015 35 10 55 81 00 22 Catawba River Note: For monitoring purposes, the above outfalls representative of the remaining 15 outfalls. Il. Improvements A Are you now required by any Federal, State, or local authority to meet any implementation schedule for the construction, upgrading or operation of wastewater treatment equipment or practices orany other environmental programs which may affect the discharges described in this application? This includes, but {is not limited to, permit conditions, administrative or enforcement orders, enforcement compliance schedule letters, sti ulations, court orders, and-grant or loan conditions 1. Identification of Conditions, Agreements, Etc 2 Affected Outfalls 3 Brief Description of Project 4. Final Com liance Date number sburce,of discharge a. req b proi B You may attach additional sheets describing any additional water pollution (or other environmental projects which may affect your discharges) you now have under way or which you plan Indicate whether each program is now under, way or planned, and indicate'your actual or planned schedules for construction III. Site Drainage Ma Attach a site map showing topography (ok indicating the outline of drainage areas served by the outfall(s) covered in the application if a topographic map Is unavailable) depicting the facility including each of'fts intake and discharge structures, the drainage area of each storm `water outfall, paved areas and buildings within the drainage area of each storm water outfall, each known past or present areas used for outdoor storage or disposal of significant materials, each existing structure control measure to reduce pollutants in storm water runoff, materials loading and access areas, areas where pesticides, herbicides, soil conditioners and fertilizers are applied, each of its hazardous waste treatment, storage or disposal units, (including each are not required,to have,a RCRA.permit whichis used for accumulating hazardous waste under 40 CFR 26234); each well4here fluids,from the facility are injected underground; springs, and other surface waterbodies which receive storm water discharges from the facility. EPA Form 3510 -2F (Rev. 1 -92) Page 1 of 3 Continued onTage 2 Continued from thelFront IV. Narrative Description of Pollutant Sources A For each ouffall, provide an estimate of the area (include units) of impervious surfaces (including paved areas and building,roofs) drained to the outfall,,and an,estimate of the total surface area drained by the outfail _ Ouffall Area of lrhpervious Surface Total Area Drained Ou tfail Area of Impervious Surface Total Area Drained Number (provide units (provide units Number (provide units (provide units SW001 'See attached supplemental SWO17 information. B Provide a narrative description, of significant materials that,are currently or in the past three years have been treated, stored or disposed in a manner to allow exposure to storm water; method of treatment, storage, or disposal; past, and present materials management practices.empioyedto minimize contact by these materials with,storm water runoff „materials loading and access areas; and the location, manner, and fr uen 'in which sticides,.herbicides, sod conditioners; and fertilizers area lied. See attached supplemental information. C. For each ouffall, provide the location and a description of existing structural and nonstructural control measures to reduce pollutants in storm water runoff, and a description of the treatment the storm water receives, including the schedule and type of maintenance for control and treatment measures and the ultimate disposal of an solid or-fluid wastes other than b discharge Ouffall List Codes from Number Treatment _ _ Table 2F -1 SW001 - See attached supplemental information. SW01J V. Non Stormwater Discharges A I certify under penalty of law that the outfall(s) covered ,by this application have been tested or evaluated for the presence of nonstormwater discharges, and,that all nonstormwater discharges from these,ouffall(s) are identified in either -an accompanying Form 2C or Form 2E application for the ouffall Name of Official Title (type,or print) Signature Date Signed Steve Immel; General Manager ll 1,113012009 Regulated Fossil Stations B rovrde'a description of the method used, the date of any testing, d the onsite,draina a points that,were direct) observed during a,test, Visual inspection was performed on November 29, 2009. Besides, the outfallpermitted under the NPDES permit for the discharge of process water, there,were no,non -storm waterf/ows observed from the.storm water outfalls. V_I. Significant Leaks or Spills Provide existing information regarding the history of significant leaks or spills of toxic or,hazardous pollutants at the facility in the last three ears, including the approximate date and location of the,s ill or'leak, and the. type and amount of material released Within the past three years, there have not been any significant spills of hazardous substances in excess of reportable quantities set forth by Section 314 of the Clean Water Act or Section 102 of CERCLA. EPA Form 3510 -2F (Rev. 1 -92) Page 2 of 3 Continued on Page 3 EPA ID Number (copy from Item I of Form 1) Continued from Page 2 NCO004979 VII. Discharge Information. A;B,C, & D• See instruction before proceeding Complete one set of tables,for each outfall. Annotate the outfall' number in the space,prowded Tables Vii-A, VII =B, and Vli-C are "included on separate sheets numbered'Vll -1 and VII -2. E. Potential - discharges not covered by analysis -`is any'towc pollutant listed' in table 2F -2, 2F -3, or 2F-4, a substance or a component of a substance which you currently use,or manufacture as an intermediate or final'product or byproduct? ❑ Yes (ltst,all such pollutants below) X No (go to Section D?Q VIII: Biological ToxicitY Testing Data Do you have,any'knowledge or reason to believe that any,biological test for acute or chronic toxicity has been made on any of your discharges or on a receiving water in relation to your discharge within the last 3 years? ❑ Yes (list all such, potlutants below) X No (go to Section M IX. Contact analysis Information Were any of the analysis reported in item VII performed by a contact laboratory or consulting firm? ® Yes (list the name, address, and telephone number of, and pollutants ❑ No (go to Section )Q analyzed 6y, each, such laborato or_firm,below A Name B Address C Area Code& Phone�No D Pollutants Analyzed Shealy Environmental Services 106 Vantage Point Drive 803 - 791=9111 Wet chemistry & West Columbia, SC 29172 metals GEL Laboratories LLC 2040 Savage Road 843- 556 -8171 Radiologicals Charleston, SC 29407 X. Certification I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance, with, a system- designed to assure .that qualified personnel properly gather and evaluate the,information submitted. Based on my inquiry of the person or persons who manage the system or those persons directly responsible for gathering 'the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are,significant penalties for submitting false information, including the possibility of fine and im risorimen't for knowing violations. A Name& Official'Title (type or print) B Area Code and Phone No. Steve Immel, General Manager 11 (704) 829 -2400 Regulated Foss// Statfo s C. Signature D. Date Signed 11/30/2009 EPA Form,3510- 2F(Rev. 1 -92) Page 3 of SWO08 EPA ID Number (copy from Item / of Form 1) Form Approved OMB No 2040-0086 NC0004979 I Approval expires 5 -31 -92 VII. Discharge Information Continued from 5a e 3 of Form 2F ,Part A - You must provide the results of at least one analysis for every pollutant,m this table Complete one'table for each outfall See instructions for additional'details. 'Maximum Values AverageValues Number Pollutant include, units include units Of Grab Sample Grab Sample And Storm CAS Number Taken During Flow- weighted Taken'During Flow - weighted Events (if available) First 30 Composite First,30 Composite Sampled Minutes Minutes Sources of Pollutants OW& Grease < 4.8 mg1L 1 See Supplemental Information Biological Oxygen < 2.0 mg/L 1 •• Demand BOD5 Chemical Oxygen Samg/L 1 ff Demand COD Total Suspended 1500 mg /L 1 Solids TSS Total 0.52 mg/L 1 •' Nitr en Total 0.98 -mg1L 1 Phosphorus pH Minimum Maximum Minimum Maximum " 7.78;SU Part B - List each pollutant that, is limited in, an effluent guideline which the facility is subject to or. any pollutant listed in "the facility's NP DES permit,forits procesvwastewater (dithe facilitjis operating under an existing NPDES;permit). Completeone table for each outfall See the instructions for additional details and r uirements. Maximum Values Average Values Number Pollutant include units include units _ Of Grab Sample Grab Sample And Storm CAS Number Taken During Flow- weighted Taken During Flow- weighted Events (if available) First 30 Composite First 30 Composite Sampled Minutes Minutes Sources of Pollutants Chlorine, Total < 0:1.mg/L 1 See Supplemental tesiduaj _Information Chloride < 1.0,mg1L 1 •• Color 20 units 1 •• Fluoride (16984 -48-8) 0.30 mg1L 1 •• Nitrate- Nitnte (as N) < 0.020 mg1L 1 •• Radioactivity, alpha 21.41,3.78 1 •• total Ci /L Radioactivity, beta 42.8 t 3.84 1 - •• total pCIlL Radioactivity, radium 3.8610.877 — 1 •• total Ci /L Radioactivity, radium 1.0210.349 1 226 total Ci /L Sulfate (as SO4) 26 mg/L 1 •• 14808 -79-8 Aluminum, Total 27.0 mg1L 1 '• 7429 -90 -5 Banum, Total 0.470 mg1L 1 n 7440 -39 -3 Boron, Total (7440- <0.050 mg1L 1 « 42 -8 ) Cobalt, Total (7440- 0.026 -mg1L 1 48-4), Iron, Total.(7439 -89 -6) 36.0 mg /L 1 •• Magnesium, Total 17.0 mg1L 1 7439 -95-4 Manganese, Total 1.00 mg1L 1 •' 7439 -96-5 Tin, Total <0.005 mg1L 1 •• 7,440 -31 -5 Titanwin,'Total ZWmg/L 1 •• 7440 -32 -6 EPA Form 3510 -21F (Rev. 1 -92) Page VII -I Continue on Reverse Arsenic, Total <0.050 ing/L 1 See Supplemental (7440 -38-2) information Beryllium, Total < 0.001 mg1L 1 " 7440 -41 -7 Cadmium, Total <0.00010 1 " 7440 -43 -9 mg1L Chromium, Total 0.020 mg1L 1 " 7440 -47 -3 Copper, Total 0.058 mg1L 1 " 7440 -50-8 Mercury, Total 0.00014 mg(L 1 " 7439 -97-0 Nickel, Total 0.019 mg/L 1 " 7440-02-0 Selenium, Total <0.050 mg/L 1 " 7782-49 -2 Silver, Total <0.005 rng/L 1 " 7440 -22-4 - - Zinc, Total 0.320,mg/L 1 " 7440 -66-6 EPA Form 3510 -2F (Rev. 1 -92) Page VII -I Continue on Reverse Continued from the Front Part C - List each pollutant shown in Tables 2F -2, 2F -3, and 2F-4 that you know or hav&reason to believe is present See the'instructions for- additional details and requirements. Complete one table for each,outfall. Pollutant And CAS Number (if available) Ma)amum Values include units Average Values include units Number Of Storm Events, Sampled Sources of Pollutants Grab Sample Taken During First 30 Minutes Flow- weighted Composite Grab Sample Taken During First 30 Minutes Flow- weighted Composite Fecal Colifomt CHT' 546• coH100 mL 1 See Supplemental Information 'analyzed outside holding,time Part Dr- Provide data for the storm events which, resulted in,the ma)dmum values for the flow weighted composite sample. 1 Date of Storm Event 2 Duration of,Storm Event taminutes 3 Total rainfall during storm event in inches 4 Number of hours between ;beginning of storm measured and end of, previousi measurable rain event 5. Total flow from rain event (gallons or specify units) 61412009 960 2.82 81 hours 188374 gallons 7 Provide a description of the method of flow measurement or estimate Flows estimated using run -off coefficients for the drainage area based'on rainfall data EPA Form 3510 -2F (Rev. 1 -92) Page VII -2 SW 015 EPA ID Number (copy from /tem,l of'Fonnil) Form Approved OMB No. 2040 -0086 NC0004979 I Approval'expires 5 -31 -92 V_II. Discharge Information Continued from page 3 of Form 2F Part A - You must provide the results of at least one analysis for every pollutant in this table. Complete,one table for each outfall See instructions for additional details. Maximum Values Average Values Number Pollutant include units include units Of Grab Sample Grab�Sample And Storm CAS Number Taken During Flow- weighted Taken,Dunng Flow- weighted Events, (if available) First 30 Minutes Composite First 30 Minutes Composite Sampled Sources of!Pollutants ,Oil & Grease < 4.4 mg /L 1 See Supplemental Information Biological Oxygen 2.0 mg/L 1' i `Demand' BOD5 _ Chemical Oxygen 16ing/L Demand COD Total Suspended 25 mg/L 1 Solids SS Total 0.099 mg/L 1 Nitrogen Total 0.059 mg /L 1 Phosphorus pH Minimum Maximum Minimum Maximum " 7.26 SU Part B - List each pollutant that is limited in,an effluent guideline which the facility is subject'to or any pollutant listed in the facility's NPDES permit for its process wastewater (if the facility is operating under an existing NPDES permit) Complete one table for each outfall _ See the instructions for additional details and r uvements Maximum Values Average Values Number Pollutant include units include units Of Grab Sample Grab Sample And Storm CAS Number Taken During Flow- weighted Taken During Flow- weighted Events Pf available) First 30 Composite First 30 Composite Sampled Minutes Minutes Sourcesiof Pollutants Chlorine „Total 0.11 nig /L 1 residual Chloride 5.4 rrig/L 1 Color 100 units 1 Fluoride (1698448 -8) 0.12 mg /L 1 Nitrate- Nitnte (as N) 0.099 mg /L 1 ” Radioactivity, alpha < 5.0 pCi /L 1 total Radioactivity, beta 7.10 pCi/L, 1 total Radioactivity, radium total < 1.0 pCi /L 1 'Radioactivity, radium < 1.0 pCi/L 1 226 total Sulfate (as SO4) 38 mg/L- 1 14808 -79-8 Aluminum, Total 0.35 mg /L 1 7429 -90-5 Barium, Total 0.080 mg /L 1 7440 -39-3 - - — — Boron, Total (7440- 0.33,mg /L 1 " 42-8 Cobalt, Total'(7440- <0.005 mg /L 1 48-4 Iron, Totali(7439 -89 -6) 1.8mg1L 1 Magnesium, Total 5.3 mg/L 7439 -95-4 Manganese, Total 0.60 mg/L 1 7439 -96-5 Tm, Total <0.005,mg/L 1 7440 -31 -5 Titanium, Total 18 ug/L 1 7440 -32-6 EPA,Form 3510 -2F (Rev. 1 =92) Page VII -2 Ars mc, Total- Mug/L ! See Supplemented (,74404-8-2)-' lnforn►atlon Beryllium, Total < 1.0 ug/L 7440-41 -7 Cadmiurri „Total <0.10 ug& 7440-43 -9 Chromwm, Total <5.0 ug /L 744647 -3 Copper; Total 00sug/L 7440 -50-8 _ Mercury,, Total — 0.0001 mg1L 7439 -97 -6 _ Nickel„ TotaL <10dug/L 7440-02-0 Selenwm;'il otal, <5,ug/L ” 7782 =49-2 Silver, Total <&ug& 1' 7440 -22-4 Zinc, Total 35`ug1L 7440-66 -6 EPA Fom3510 -217 (Rev. 1 -92) Page VII -2 r -Part C - Ust•each pollutant shown in Tables 2F -2, 2F -3, and 2F-4 that you, know or have reason to believers present. See the instructions for additional details and requirements Complete one table for each outfall Pollutant And CAS Number (d available) Ma)amum Values include units Average Values nGude units Number Of Storm Events Sampled Sources of Pollutants Grab Sample Taken,Dunng First °30 _ Minutes Flow- weighted Composite Grab Sample Taken During First 30 Minutes Flow- weighted Composite Fecal Wiform CHT 410• co!/100 mL 7 See Supplemental 'Information 'analyzed outside holding time Part D - Provide data for the ;storm events which resulted imthe,maximum values for the flow wei htedicom site ;ample 1. Dat&of Storm Event 2. Duration of Storm ,Event (in minutes 3. Total rainfall during storm, 9 event in inches 4 Number of hours between beginning of storm measured and 9 9 end,of previous measurable.ram event 5. Total flow from ram event (gallons or specify units) 412012009 240 .59 >72 hours 1424263 gallons 7. 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