### Commonwealth of Massachusetts Executive Office of Energy &Environmental Affairs 

# Department of Environmental Protection Southeast Regional Office " 20 Riverside Drive, Lakeville MA 02347 - 5os-946-2700 DEVAL L PATRICK RICHARD K_ SULLIVAN JR, Governor TIMOTHY P MURRAY Lieutenant Governor February 16, 2012 Peter Balkus, Director F&H Station III Dominion Energy Brayton Point, LLC 5000 Dominion Boulevard Glen Allen, Virginia 03060-6711 RE: AMENDED EMISSION CONTROL PLAN DRAFT APPROVAL Application for : BWP AQ25 Transmittal Number : X241755 Application Number : SE-12-003 Source Number : 1200061 Secretary KENNETH L

. KIMMELL Commissioner

310 CMR 7.29 Power Plant Emission Standards

AT: Dominion Energy Brayton Point, LLC Brayton Point Station 1 Brayton Point Road Somerset, Massachusetts 02726-0440 Dear Mr. Balkus: The Southeast Region of the Department of Environmental Protection (Department), Bureau of Waste Prevention, has reviewed your amended application for approval of the Emission Control Plan (ECP) application dated January 25, 2012. This amended application has been submitted to describe howemission limitations and compliance schedules for the control of certain designated pollutants contained in 310 CMR 7.29, "Emission Standards for Power Plants," will be implemented for equipment and processes located at the Dominion Energy Brayton Point, LLC - Brayton Point Station ("Dominion") at Brayton Point Road in Somerset, Massachusetts. This application for approval of the ECP bears the signature of Mr. Peter Balkus as the company contact responsible for compliance with 310 CMR 7.29. The amended ECP application proposes a Unit 1, 2, 3 and 4 permit restriction to disallow the use of 310 CMR 7 .29 Sulfur Dioxide (SOz) Early Reduction Credits (ERC's) or Federal Acid Rain allowances for compliance with 310 CMR 7.29 after June 1, 2014, in support of the Massachusetts Regional Haze State Implementation Plan (SIP) .

This information is available in alternate format. Call Michelle Waters-Ekanem, Diversity Director, at 617-292-6761 . TDD>Y 1-866-639-7622 or 1-617-674-6868 MassDEP Website: www .mass.govldep Printed on Recycled PaperThe Department has previously approved, pursuant to 310 CMR 7.29, the following

air pollution controls all of which have been constructed and are in operation, other than the Unit 3 Dry Scrubber and Fabric Filter and the Powder Activated Carbon Injection system upstreamof the Unit 3 DS/FF that are currently under construction and are anticipated to be in commercial operation in the 15t Quarter 2013: " Units 1 and 3 Selective Catalytic Reduction (SCR) NO, emission control systems that uses aqueous ammonia for removal of Nitrogen Oxides (NOx) ; " Unit 1 and 2 Spray Dryer Absorbers (SDA) for removal of Sulfur Dioxide (SOZ) emissions followed by a Fabric Filter (FF) baghouses at the SDA outlets for control of particulate matter emissions ; " Unit 1 and 2 Powder Activated Carbon (PAC) injection systems upstream of the SDA/FF systems for the removal of mercury emissions; " Unit 3 Dry Scrubber (DS) for removal of Sulfur Dioxide (SOZ) emissions followed by a FF baghouse at the DS outlet for control of particulate matter emissions; " Unit 3 PAC injection system upstream of the DS/FF system for the removal of mercury emissions; " Unit 1, 2 and 3 PAC injection systems installed upstreamof the Koppers ESPs with the Koppers ESPs taken out of service to provide additional residence time for the PAC for the removal of mercury (Hg) ; " Ash Reduction Process (ARP) for Unit 1, 2 and 3. This Amended Emission Control Plan (ECP) Final Approval supersedes the Amended ECP Final Approval (Application No. 4B08050) dated December 29, 2008; the Amended ECP Final Approval (Application No. 4B05053), dated March 29, 2006; the Amended ECP Final Approval (Application No. 4B04021), dated October 20, 2004; and the ECP Final Approval (Application No. 4B01042), dated June 7, 2002. LEGAL AUTHORITY The Department has adopted 310 CMR 7.29 - a regulation to tower emissions of sulfur dioxide (SOz), carbon dioxide (COz), nitrogen oxides (NO,) and mercury (Hg) from certain power plants, and to establish a framework for reductions in emissions of carbon monoxide (CO) and fine particulate matter (PM2.5) - pursuant to the Massachusetts General Laws, Chapter 111, Sections 142 A-M . Regulation 310 CMR 7.29 requires any person who owns, leases, operates or controls an affected facility to comply with 310 CMR 7 .29 in its entirety. An affected facility means a facility which emitted greater than 500 tons of SOZ and 500 tons of NO during any of the calendar years 1997, 1998, or 1999, and which includes a unit which is a fossil fuel fired boiler or indirect heat exchanger that : (1) is regulated by 40 CFR Part 72 (the Federal Acid Rain Program) ; (2) serves a generator with a nameplate capacity of 100 megawatts (MW) or more; (3) was originally permitted prior to August 7, 1977; and (4) had not subsequently received a Plan Approval pursuant to 310 CMR 7 .00: Appendix A or a Permit pursuant to the regulations for Prevention of Significant Deterioration, 40 CFR Part 52, prior to October 31, 1998. Dominion Energy Brayton Point, LLC is an affected facility. The purpose of 310 CMR 7.29 is to control emissions of NO,,, SOZ, Hg, CO, CO2, and PM2.5 (together, "pollutants") fromaffected electric generating facilities in Massachusetts . 310 CMR 7 .29 accomplishes this by establishing maximumoutput-based emission rates for NO,, SOZ, and CO2, establishing maximum output-based emission rates or minimumremoval efficiencies for Hg, and establishing a cap on COZ and Hg emissions fromaffected

facilities. The maximum output-based emission rate and cap for COZ is applicable through December 31, 2008 and as of January 1, 2009 COZ emissions will be subject to the provisions of 310 CMR 7 .70 Massachusetts COz Budget Trading Program . Emission limits for COand PM2.5 have not been addressed at this time. Applicable requirements and limitations contained in 310 CMR 7 .29 shall not supersede, relax or eliminate any more stringent conditions or requirements (e.g. emission limitation(s), testing, record keeping, reporting, or monitoring requirements) established by regulation or contained in a facility's previously issued source specific Plan Approval(s) or Emission Control Plan(s) . The facility must amend its Operating Permit application and revise their Operating Permit to include the Amended ECP Final Approval . Based upon the above, the Department has determined that the referenced Amended ECP Application is administratively and technically complete and that the proposed modifications are in conformance with current air pollution control engineering practices and hereby issues this Amended ECP FINAL Approval for the proposed modifications of your power plant unit(s), with the conditions listed below . * Legend to Abbreviated Terms within Tables 1 through 6: EU # = Emission Unit Number NO, = Nitrogen Oxides SOZ = Sulfur Dioxide Hg = Mercury CO = Carbon Monoxide COZ = Carbon Dioxide PM 2.5 = Fine Particulate Matter MMBTU/HR = fuel heat input in million British Thermal Units per hour MW (NET) = net electrical output in Megawatts Ibs/MWh = pounds per Megawatt-hour of net electrical output Ibs/GWh = pounds per Gigawatt-hour of net electrical output MFR = Manufacturer CEMS = Continuous Emission Monitors R-C = Research-Cottrell1 . EQUIPMENT DESCRIPTION The following emission units (Table 1) are subject to and regulated by this Amended ECP Final Approval : Table 1 * EU # DESCRIPTION OF EU DESIGN CAPACITY POLLUTION CONTROL MEASURES , EMISSION UNIT (MMBTU/HR) -MW ( NET) (PCM), EU 1 Combustion 2,250 255 Selective Catal ytic Reduction Engineering Ash Reduction Process MFR # 19407 Type R-C Electrostatic Preci pitators CC, LowNO Burners with Overfire Air Water Tube Boiler Management of Lower Sulfur Fuels Spray D ryer Absorber Fabric Filter Ba house Powder Activated Carbon EU 2 Combustion 2,250 255 Ash Reduction Process Engineering R-C Electrostatic Precipitators MFR # 19617 Type LowNO Burners with Overfire Air CC, Management of Lower Sulfur Fuels WaterTube Boiler Spray D ryer Absorber Fabric Filter Ba house Powder Activated Carbon EU 3 Babcock &Wilcox 5,655 633 Selective Catal y tic Reduction Model # UP - 52 Ash Reduction Process Water Tube Boiler R-C Electrostatic Preci pitators LowNO Burners with Overfire Air Management of Lower Sulfur Fuels

D Scrubber Fabric Filter Ba house Powder Activated Carbon EU 4 Riley Stoker 4,800 446 Electrostatic Preci pitators Model # 1SR LowNO Burners WaterTube Boiler Management of Lower Sulfur Fuels Flue Gas Recirculation Table 1 Notes: 1 . Details of the Proposed Pollution Control Measures including alternatives under consideration are described in Sections E, F, and G of the application .2. APPLICABLE REQUIREMENTS

A. EMISSION LIMITS AND RESTRICTIONS Dominion shall comply with the emission limits/restrictions as contained in Table 2 below . The schedule for compliance with these emission limitations is contained in Table 6 of this Amended ECP Final Approval . Table 2 ~w . EU # POLLUTANT EMISSION LIMI"I'/STAN0}~Ial~ . _MPPLI 1,CABLE REGULATION AND/OR' : . APPROVAL NUMBER EU 1, NO), Shall not exceed 1 .5 Ibs/MWh calculated over any 310CMR 7.29(5)(a)l .a. EU 2, consecutive 12 month period, recalculated monthly. EU 3, EU 4 hall not exceed 3 .0 Ibs/MWh calculated over any 310CMR 7.29(5)(a)l .b. individual month. SOZ Shall not exceed 6 .0 Ibs/MWh calculated over any 310 CMR 7.29(5)(a)2.a. consecutive 12 month period, recalculated monthly. Shall not exceed 3.0 Ibs/MWh calculated over any 12 310 CMR 7.29(5)(a)2.b.i . month period, recalculated monthly. Shall not exceed 6

.0 Ibs/MWh calculated over any 310 CMR7.29(5)(a)2.b.ii . individual month. EU 1, Hg Total annual mercury emissions fromcombustion of 310CMR 7.29(5)(a)3.c. EU 2, solid fuels in units subject to 40 CFR Part 72 located a EU 3 n affected facility or fromre-burn of ash in

Massachusetts shall not exceed the average annual missions of 146

.6 pounds per calendar year, calculated using the results of the stack tests required in 310 CMR7.29(5)(a)3.d .ii . . 85%Removal Efficiency or 0 .0075 Ibs/GWh 7.29(5)(a)3.e.i . or ii . 95%Removal Efficiency or 0 .0025 Ibs/GWh 7.29(5)(a)3.f.i . or ii . EU 1, CO Reserved.' 310CMR 7.29(5)(a)4. EU 2, EU 3, COz

# Emissionsofcarbondioxidefromtheaffectedfacility

310CMR 7.29(5)(a)5.a. EU 4 in the calendar year, expressed in tons, from Part 72

units located at the affected facility shall not exceed historical actual emissions of 8,585,152 tons.z, 3 Shall not exceed 1800 Ibs/MWh in the calendar year .3 310 CMR7.29(5)(a)5.b. PM2.5 Reserved .' 310 CMR7.29(5)(a)6.Table 2 Notes:

1 . The Department has reserved these areas in the regulations for further development . 2. If the Department has received a technically complete Plan Approval application under 310 CMR 7.02 for a newor re-powered electric generating unit subject to 40 CFR Part 72 at an affected facility prior to May 11, 2001, then the emissions fromthe new or re-powered unit may be included in the calculation of historical actual emissions. The calculation of historical actual emissions which includes emissions froma newor re-powered unit shall not include emissions fromany unit shutdown or removed from operation at the affected facility that is included in the technically complete Plan Approval application pursuant to 310 CMR 7.02. Provisions for the quantification and certification of Greenhouse Gas (GHG) emission reductions, avoided emissions, or sequestered emissions for use in demonstrating compliance with the COZ emission limitations contained in 310 CMR 7 .29 are contained in 310 CMR 7 .00: Appendix B(7) Greenhouse Gas Credit Banking and Trading. 3. The COz emission standards shall not apply to the emissions of COZ that occur after December 31, 2008.B. COMPLIANCE DEMO_ NSTRATION The facility is subject to the monitoring/testing, record keeping, and reporting requirements as contained in Tables 3, 4 and 5 below and 310 CMR 7.29, as well as the applicable requirements contained in Table 2:

-- --, , Table 3'~

MONTI"`C}IRING/"fESTING REQUIREMENTS I EU 1, ~ Actual emissions shall be monitored for individual units and monitored as a facility total for all unit ~EU 2, included in the calculation demonstrating compliance. Actual emissions shall be monitored in EU 3, accordance with 40 CFR Part 75 for SO2, COZ and NO, and 310 CMR 7.29 for Hg. The Department EU 4 hall detail the monitoring methodology for CO and PM2.5 at the time regulations are promulgated by the Department for those parameters. Monitor actual net electrical output, expressed in megawatt-hours. Actual net electrical output shall b provided for individual units and as a facility total for all units included in the calculation demonstrating compliance. EU 1, EU 2 ~ In accordance with 310CMR7.29(5)(a)3.c.i . and 310 CMR 7.29(5)(a)3.d .iii ., the portion of total EU 3 annual mercury emissions from combustion of solid fossil fuel in units subject to 40 CFR 72 located at or from re-burn of ash at an affected facility, determined using emissions testing at least every other calendar quarter fromOctober 1, 2006 until mercury CEMS are used to demonstrate compliance with he standards contained in 310CMR 7.29(5)(a)3.e. or f. and using mercury CEMS thereafter. Stack tests for mercury shall consist at a minimumof three runs at full load on each unit firing solid fossil fuel or ash according to a testing protocol acceptable to the Department . Stack tests for mercury, and certification and annual Relative Accuracy Test Audits for mercury CEMS, shall determine total and particulate-bound mercury. In accordance with 310 CMR 7.29(5)(a)3.c.ii .(i), when ash produced by an affected facility is used in Massachusetts as a cement kiln fuel, as an asphalt filler, or in other high temperature processes that volatilize mercury, the mercury content of the utilized ash shall be measured weekly using a method I acceptable to the Department. In accordance with 310 CMR7.29(5)(a)3.e. and f., any person who owns, leases, operates or controls an affected facility which combusts solid fossil fuel or ash shall monitor a facility's average total mercury removal efficiency or emissions rate for those units combusting solid fossil fuel or ash. This will be based on a mercury CEMS using the methodology approved by the Department in the monitoring plan required under 310CMR7.29(5)(a)3.g. and shall be calculated on a rolling 12 month basis. In accordance with 310CMR7.29(5)(a)3.g.i ., by January 1, 2008, any person who owns, leases, operates or controls an affected facility which combusts solid fossil fuel or ash shall install, certify, and operate CEMS to measure mercury stack emissions fromeach solid fossil fuel- or ash-fired unit at a facili ty subject to 310CMR7.29 . Actual emissions shall be monitored for individual units and monitored as a facility total for all units included in the calculation demonstrating compliance. Actual emissions shall be monitored in accordance with 310 CMR 7.29(7)(b)l .b., c., and d. for Hg. In accordance with 310CMR7.29(7)(g), operate each continuous emission monitoring systemat all times that the emissions unit(s) is operating except for periods of CEMS calibrations checks, zero span adjustment, and preventive maintenance as described in the monitoring plan approved by the Department and as determined during certification. Notwithstanding such exceptions, in all cases obtain valid data for at least 75% of the hours per day, 75%of the days per month, and 90%of the hours per quarter during which the emission unit is combusting solid fossil fuel or ash.Table 4 ~

EU# RECORD KEEPING REQUIREMENTS EU 1 Maintain a record of actual emissions for each regulated pollutant for each of the preceding 1 EU 2 months. Actual emissions shall be recorded for individual units and as a facility total for al EU 3 units included in the calculation demonstrating compliance. Actual emissions provided under EU 4 this section shall be recorded in accordance with 40 CFR Part 75 for SOz, COZ and NO,, and 310 CMR 7.29 for Hg. The Department shall detail the monitoring methodology for CO, and PM2.5 at the time regulations are promulgated by the Department for those parameters. Maintain a record of actual net electrical output for each of the preceding 12 months, expressed i megawatt-hours. Records of actual net electrical output shall be maintained for individual units and as a facility total for all units included in the calculation demonstrating compliance. Maintain a record of the resulting output-based emission rates for each of the preceding 1 months, and each of the 12 consecutive rolling month time periods, expressed in pounds per megawatt-hour . Output based emission rates shall be provided for individual emission units an as a facili ty total for all units included in the calculation demonstrating com pliance. Keep all measurements, data, reports and other information required by 310 CMR 7.29 on-sit for a minimumof five years, or any other period consistent with the affected facility's Operating Permit . EU 1 In accordance with 310CMR7.29(5)(a)3., keep records of required mercury stack testing and EU 2 ash testing. EU 3 In accordance with 310CMR7.29(5)(a)3.g., maintain a record of all measurements, performance evaluations, calibration checks, and maintenance or adjustments for each mercury continuous emission monitor. In accordance with 310CMR7.29(7)(e), for units that apply carbon or other sorbent injection for mercury control, the records shall be kept until such time as mercury CEMS are installed at that unit . In accordance with 310CMR7.29(7)(i), any person subject to 310 CMR7.29(5)(a)3. shall submit the results of all mercury emissions, monitor, and optimization test reports, along with supporting calculations, to the Department with-in 45 days after completion of such testing. Maintain a record of actual emissions for Hg for each of the preceding 12 months . Actual emissions shall be recorded for individual units and as a facility total forall units included in the calculation demonstrating compliance. Actual emissions shall be recorded in accordance with 310 CMR 7.29 7 b i .b. c. and d. for H g. In accordance with 310CMR7.29( 7), b yJanuary 30 of the year following the earliest applicable compliance date and January 30of each calendar year thereafter, the facility shall submit a report to the Department demonstrating compliance with the emission standards contained in 310 CMR 7.29(5)(a) and in an approved emission control plan. Forthe mercury standards at 310 CMR 7.29(5)(a)3.c., the compliance reports due January 30, 2007 and 2008 shall include the quarterly emissions for each quarter beginning October 1, 2006. For the mercury standards at 310 CMR7.29(5)(a)3.c., e., and f., the compliance report dueJanuary 30, 2009 and each report thereafter shall demonstrate compliance with any applicable annual standard forthe previous calendar year and with any applicable 12-month standard for each of the 12 previous consecutive 12-month periods.

### table 5 * -- EU# REPORTING REQUIREMENTS EU 1 By January 30 of the year following the earliest applicable compliance date for the affected EU 2 facility under 310 CMR 7.29(6)(c), and January 30 of each calendar year thereafter, the EU 3 company representative responsible for compliance shall submit a compliance report to the EU 4 Department demonstrating the facility's compliance status with the emission standard contained in 310 CMR7.29(5)(a) and in an approved Emission Control Plan. The report shall demonstrate the facility's compliance status with applicable monthly emission rates for each month of the previous calendar year, and each of the twelve previous consecutive 12-month periods. The compliance report shall include all statements listed in 310 CMR 7.29(7)(b)4.1 he Department may verify the facility's compliance status by whatever means necessary, including but not limited to requiring the affected facility to submit information on actual electrical output of company generating units provided by the NewEngland Independent I SystemO erator ISO or an successor thereto. EU 1 In accordance with 310 CMR7.29(5)(a)3.d.iii ., the results of each stack test for mercury shall EU 2 be reported to the Department within 45 days after conducting each stack test . EU 3 In accordance with 310 CMR 7.29(5)(a)3.c.ii .(iv), when ash produced by an affected facility i used in Massachusetts as a cement kiln fuel, as an asphalt filler, or in other high temperature processes that volatilize mercury, a proposal shall be submitted for Department approval a least 45 days prior to such use, or at least 45 days prior to October 1, 2006, whichever i ' later, detailing the proposed measurement methods to be used to comply wit 7.29 5 a 3

.c.ii . i and (ii ) . In accordance with 310 CMR 7.29(5)(a)3.g., submit a CEMS monitoring plan for Department approval at least 45 days prior to equipment installation including, but not limited to, a sample calculation demonstrating compliance with the emission limits using conversion factors from40 CFR Part 60 or Part 75 or other prop osed factors. In accordance with 310 CMR 7.29(5)(a)3.g ., submit for Department approval a CEM certification protocol at least 21 days prior to certification testing for the CEMS, and an proposed adjustment to the certification testing at least seven day s in advance. In accordance with 310 CMR 7.29(5)(a)3.g ., submit a certification report within 45 days o the com

pletion of the certification test for Department approval . Certify and operate each CEMS in accordance with 310 CMR 7.29(5)(a)3.g. Submit to the appropriate Department regional office a compliance report in accordance wit 310 CMR 7.29(7)(b) . EU 1 In accordance with 310 CMR 7.29(7)(a), for the mercury standards at 310 CM EU 2 7.29(5)(a)3.c., the compliance reports due January 30, 2007 and 2008 shall include the EU 3 quarterly emissions for each quarter beginning October 1, 2006. For the mercury standard at 310 CMR 7.29(5)(a)3.c., e., and f., the compliance report due January 30, 2009 and each report thereafter shall demonstrate compliance with any applicable annual standard for the previous calendar year and with any applicable 12-month standard for each of the 1 previous consecutive 12-month periods. The compliance report shall contain items listed i 310 CMR 7.29( 7)( b) . In accordance with 310 CMR 7.29(7)(g), any person subject to 310 CMR 7.29(5)(a)3. shall submit the results of all mercury emissions, monitor, and optimization test reports, along with supporting calculations, to the Department within 45 days after completion of such testing. FACIL Submit by January 15, April 15, July 15 and October 15 for the previous three month ITY respectively, a 7.29 construction status report which identifies the construction activities which have occurred during the past three months, and those activities anticipated for the following three months, and progress toward achieving compliance with the implementatio dates identified in Table 6 below . Table_5- Notes:1 . If the ISOfinal settlement of actual electrical output is not available, the facility shall submit a compliance report based on provisional values of actual electrical output . Upon receiving certified ISO values of actual electrical output for all provisional months within the calendar year, the facility shall submit a revised compliance report within 30 days thereafter. 3. COMPLIANCE SCHEDULE The affected facility shall be in full compliance with the applicable requirements in accordance with the dates below : TABLE 6 COMPLIANCE PATH POLLUTANT STANDAI`t,D DATE NO SOZ 310CMR7.29(5)(a)i .a. 310CMR7.29(5)(a)2.a. October 1, 2006 NO, SOZ 310CMR7.29(5)(a)l .b. 310CMR7.29(5)(a)2.b. October 1, 2008 COZ 310CMR7.29(5)(a)5.a. Calendar Year , 2006 I COZ 310CMR7.29(5)(a)S.b. Calendar Year 2008 Hg 310 CMR7.29(5)(a)3.c. October 1, 2006 Hg 7.29(5)(a)3.e .i . or ii . January 1, 2008 Hg 7.29(5)(a)3.f.i . or ii . October 1, 2012

Details of the compliance schedule/milestones are described in Section H of the amended ECP application.4. SPECIAL CONDITIONS FOR ECP

1 . The Department may verify compliance with 310 CMR 7.29(5) by whatever means necessary, including but not limited to: inspection of a unit's operating records ; requiring the facility to submit information on actual electrical output of company generating units provided to that person by the NewEngland Independent System Operator, or any successor thereto; testing emission monitoring devices; and, requiring the facility to conduct emissions testing under the supervision of the Department . 2. The Department is not approving or denying any off-site or non-contemporaneous proposed COZ reduction measures at this time. 310 CMR 7 .29(5)(a)5.c. and d. provide that compliance with the COZ emission limitations may be demonstrated by using offsite reductions or sequestration in addition to onsite reductions, as long as certain established conditions are met . However, while there is a provision for using early reductions of SOZ to meet the SOZ emissions limit in 310 CMR 7.29(5)(a)2.a., there is no similar regulatory provision for use of early reductions of COz for compliance with 310 CMR7.29(5)(a)5. Provisions for the quantification and certification of Greenhouse Gas (GHG) emission reductions, avoided emissions, or sequestered emissions for use in demonstrating compliance with the COZ emission limitations contained in 310 CMR 7.29 are contained in 310 CMR 7 .00: Appendix B(7) Greenhouse Gas Credit Banking and Trading. 3. Dominion shall not use 310 CMR 7 .29 SOZ Early Reduction Credits (ERC's) or Federal Acid Rain allowances for compliance with 310 CMR 7 .29 after June 1, 2014. 5. GENERAL CONDITIONS FOR ECP 1 . The facility shall maintain continuous compliance at all times with the terms of this Amended ECP Final Approval and the applicable emission rates in 310 CMR 7 .29. 2. This Amended ECP Final Approval may be suspended, modified, or revoked by the Department, if at any time the facility is violating any applicable Regulation(s) or condition(s) of this Amended ECP Final Approval letter. 3. This Amended ECP Final Approval consists of Dominion's application materials and this Amended ECP Final Approval letter. If conflicting information is found between these two documents, then the requirements of the Amended ECP Final Approval letter shall take precedence over the documentation in the application materials. 4. Should a condition of air pollution occur as a result of the operation of these units, then the facility shall immediately take appropriate steps to abate said condition even though the facility is otherwise in compliance with this Amended ECP Final Approval . 5. This Amended ECP Final Approval does not negate the responsibility of the facility to comply with this or any other applicable federal, state, or local regulations now or in the future. Nor does this Amended ECP Final Approval imply compliance with any other applicable federal, state, or local regulations now or in the future. 6 . If provisions or requirements from any other regulation or permit conflict with a provision of 310 CMR 7.29, the more stringent of the provisions will apply unlessotherwise determined by the Department in the affected facility's Operating Permit .

7. Failure to comply with any of the above stated provisions will constitute a violation of the "Regulations", and can result in the revocation of the Amended ECP Final Approval granted herein. 6 . MODIFICATION TOTHE ECP Amendments may be proposed to this approved Emission Control Plan. If the Department proposes to approve such amendments, or approve such amendments with conditions, then the Department will publish a notice of public comment on an Amended ECP Draft Approval, in accordance with M .G.L. c. 30A. The Department will allowa 30-day public comment period following publication of the notice, and may hold a public hearing. Modifications to an affected facility's monitoring systems approved pursuant to the requirements of 40 CFR Part 72 are not subject to such public comment prior to approval . All terms and conditions of this Amended ECP Final Approval shall remain in effect until otherwise modified by the Department in a subsequent Amended ECP Final Approval . 7. MASSACHUSETTS ENVIRONMENTAL POLICY ACT The Department has determined that the filing of an Environmental Notification Form (ENF) with the Secretary of the Executive Office of Energy and Environmental Affairs, for air quality control purpose, was not required prior to this action by the Department . Notwithstanding this determination, the Massachusetts Environmental Policy Act (MEPA) and 301 CMR 11 .00 Section 11 .04, provide certain "Fail Safe Provisions" which allowthe Secretary to require the filing of an ENF and/or Environmental Impact Report at a later time. 8. APPEAL OF APPROVAL This Amended ECP Final Approval is an action of the Department . If you are aggrieved by this action, you may request an adjudicatory hearing. A request for a hearing must be made in writing and postmarked within twenty-one (21) days of the date of issuance of this Amended ECP Final Approval . Under 310 CMR 1 .01(6)(b), the request must state clearly and concisely the facts which are the grounds for the request, and the relief sought . Additionally, the request must state why the Amended ECP Final Approval is not consistent with applicable laws and regulations. The hearing request along with a valid check payable to The Commonwealth of Massachusetts in the amount of one hundred dollars ($100.00) must be mailed to: The Commonwealth of Massachusetts, Department of Environmental Protection, P.O. Box 4062, Boston, MA 02211 . The request will be dismissed if the filing fee is not paid, unless the appellant is exempt or granted a waiver as described below . The filing fee is not required if the appellant is a city or town (or municipal agency) county, or district of the Commonwealth of Massachusetts, or a municipal housing authority. The Department may waive the adjudicatory hearing filing fee for a person who shows that paying the fee will create an undue financial hardship. A person seeking a waiver must file, together with the hearing request as provided above, an affidavit setting forth the facts

### believed to support the claimof unduefinancial hardship. Enclosed is a stamped approved copy of the Amended ECP application . Should you have questions concerning this matter or regarding the terms or conditions of this Amended ECP Final Approval, please do not hesitate to contact the undersigned at the Southeast Region at (508) 946-2779. Very truly yours, John K. Winkler, Chief Permit Section Bureau of Waste Prevention Enclosure ecc: Pamela Faggert, Dominion Resources Services, Inc. Cathy Taylor, Dominion Resources Services, Inc. Elizabeth Willoughby, Dominion Resources Services, Inc. Meredith Simas, Dominion Resources Services, Inc. Somerset Board of Selectmen Marilyn Levenson, MassDEP-Boston Nancy Seidman, MassDEP-Boston Glenn Keith, MassDEP-Boston Eileen Hiney, MassDEP-Boston Yi Tian, MassDEP-Boston William Lamkin, MassDEP-NERO David Johnston, MassDEP-SERO Laurel Carlson, MassDEP-SERO Charlie Kitson, MassDEP-SERO Laura Black, MassDEP-SERO