### Please note that **some provisions of this approval are shown in strikeout**  **for the sole**

**purpose of showing what provisions are not incorporated into the Massachusetts Regional Haze State Implementation Plan (SIP). The provisions shown in strikeout are a part of th** **e approva** **l and are state enforceable.**

**This information is available in alternate format. Call Michelle Waters -** **Ekanem, Diversity Director** **, at 617** **- 292** **- 5751. TDD# 1**  **- 866** **- 539** **- 7622 or 1**  **- 617** **- 574** **- 6868**  MassDEP Website: www. mass.gov/dep Printed on Recycled Paper

April 12 , 2012 Peter Balkus, Director F&H Station III Dominion Energy Brayton Point, LLC 5000 Dominion Boulevard Glen Allen , Vi rginia 03060
- 6711
RE: **AME NDED EMISSION CONTROL PLAN FINAL**  **APPROVAL** Application for: BWP AQ 25 310 CMR 7.29 Power Plant Emission Standards Transmittal Number: X241755 Application Number: SE
- 12
- 003 Source Number: 120 0061 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 how emission 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 th e signature of Mr. Peter Balkus as the company contact responsible for com pliance 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 Di oxide (SO 2) 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).Dominion Energy Brayton Point, LLC 04/12/12 Amended ECP Final Approval

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The Department has previously approved, pursuant to 310 CMR 7.29, the following air pollution control s all of which have been constructed and are in ope ration, other than the Unit 3 Dry Scrubber and Fabric Filter and the Powder Activated Carbon I njection system upstream of the Unit 3 DS/FF that are currently under construction and are anticipated to be in commercial operation in the 1 st Quarter 2013 :

 Units 1 and 3 Selective Catalytic Reduction (SCR) NOx emission control system s that uses aqueous ammonia for removal of Nitrogen Oxides ( NOx) ;  Unit 1 and 2 Spray Dryer Absorbers (SDA) for removal of Sulfur Dioxide (SO 2) 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 Sulfu r Dioxide (SO 2) 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 upstream of 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**  **App roval**  supersedes the Amended ECP Final App roval (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 lower emissions of sulfur dioxide (SO 2), carbon dioxide (CO 2), nitrogen oxides (NOx) and mercury ( Hg) from certain power plants, and to establish a framework for reductions in emissions of carbon monoxide (CO) and fine particulate matter (PM 2.5)
- pursuant to the Massachusetts General Laws, Chapter 111, Sections 142 A
- M. Regulation 310 CMR 7.29 requi res any person who owns, leases, operates or controls an affected facility to comply wi th 310 CMR 7.29 in its entirety. An affected facility means a facility which emitted greater than 500 tons of SO 2 and 500 tons of NOx during any of the calendar years 1997, 1998, or 1999, and which includes a unit which is a fossil fuel fi red 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, prio r 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 NOx, SO 2, Hg, CO, CO 2, and PM 2.5 (together, "pollutants") from affected electric generating facilities in Massachusetts. 310 CMR 7.29 accomplishes this by establishing maximum output- based emission rates forDominion Energy Brayton Point, LLC 04/12/12 Amended ECP Final Approval

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Page 3 of 12 NOx, SO 2, and CO 2, establishing maximum output- based emission rates or minimum removal efficiencies for Hg, and establishing a cap on CO 2 and Hg emissions from affected facilities. The maximum output- based emission rate and cap for CO 2 is applicable through December 31, 2008 and as of January 1, 2009 CO 2 emissions will be subject to the provisions of 310 CMR 7.70 Massachusetts CO 2 Budget Trading Program
. Emission li mits for CO and PM 2.5 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 Pl an Approval(s) or Emission Control Plan(s). The facility must submit a Minor Modification Operating Permit appl ication and revise their Operating Permit to include the Amended ECP Final Approval. MassDEP issued a Draft Amended ECP Approval on February 16, 2012. Pursuant to 310 CMR 7.29(6)(h)1., public notice of this Draft Amended ECP Approval was published in accordance with M.G.L. 30A in The Herald News on February 19, 2012, followed by a 30
-day public comment period. As such the public comment period ended on March 20, 2012. During the public comment period, no comments were received. Based upon the above, the Department has determined that the referenced Amended ECP Application isadministratively and technically complete and that the proposed modifications are in conformance with current ai r pollution control engineering practices and hereby issues this **Amend ed**  **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 NOx = Nitrogen Oxides SO 2 = Sulfur Dioxide Hg = Mercury CO = Carbon Monoxide CO 2 = 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 lbs/MWh = pounds per Megawatt
- hour of net electrical output lbs/GWh = pounds per Gigawatt
- hour of net electrical output MFR = Manufacturer CEMS = Continuous Emission Monitors R- C = Research
- CottrellDominion Energy Brayton Point, LLC 04/12/12 Amended ECP Final Approval

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Page 4 of 12 **1. EQUIPMENT DESCRIPTION** The following emission units (Table 1) are subject to and regulated by thi s **Amended ECP Final Approval**  **: Table 1 ** * EU # DESCRIPTION OF

EMISSION UNIT EU DESIGN CAPACITY POLLUTION CONTROL MEASURES (PCM) 1 (MMBTU/HR) MW (NET) EU 1 Combustion Engineering MFR # 19407 Type CC, Water Tube Boiler 2,250 255 Selective Catalytic Redu ction Ash Reduction Process R- C Electrostatic Precipitators Low NOx Burners with Overfire Air Management of Lower Sulfur Fuels Spray Dryer Absorber Fabric Filter Baghouse Powder Activated Carbon EU 2 Combustion Engineeri ng MFR # 19617 Type CC, Water Tube Boiler 2,250 255 Ash Reduction Process R- C Electrostatic Precipitators Low NOx Burners with Overfire Air Management of Lower Sulfur Fuels Spray Dryer Absorber Fabric Filter Baghouse Powder Activated Carbon EU 3 Babcock & Wilcox Model # UP
- 52 Water Tube Boiler 5,655 633 Selective Catalytic Reduction Ash Reduction Process R- C Electrostatic Precipitators Low NOx Burners with Overfire Air Management of Lower Sulfur Fuels

Dry Scrubber Fabric Filter Baghouse Powder Activated Carbon EU 4 Riley Stoker Model # 1SR Water Tube Boiler 4,800 446 Electrostatic Precipitators Low NOx Burners 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.Dominion Energy Brayton Point, LLC 04/12/12 Amended ECP Final Approval

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Page 5 of 12 **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 *** EU # POLLUTANT EMISSION LIMIT/STANDARD APPLICABLE REGULATION AND/OR APPROVAL NUMBER EU 1, EU 2, EU 3, EU 4 NOx Shall not exceed 1.5 lbs/MWh calculated over any

consecutive 12 month period, recalculated monthly. 310 CMR 7.29(5)(a)1.a. Shall not exceed 3.0 lbs/MWh calculated over any individual month. 31 0 CMR 7.29(5)(a)1.b.
SO 2 Shall not exceed 6.0 lbs/MWh calculated over any

consecutive 12 month period, recalculated monthly. 310 CMR 7.29(5)(a)2.a. Shall not exceed 3.0 lbs/MWh calculated over any 12 month period, recalculated monthly. 310 CMR 7.29( 5)(a)2.b.i. Shall not exceed 6.0 lbs/MWh calculated over any individual month. 310 CMR 7.29(5)(a)2.b.ii. EU 1, EU 2, EU 3

EU 1, EU 2, EU 3, EU 4Dominion Energy Brayton Point, LLC 04/12/12 Amended ECP Final Approval

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**Table 2 Notes:**Dominion Energy Brayton Point, LLC 04/12/12 Amended ECP Final Approval

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B. COMPLIANCE DEMONSTRATION 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 *** EU# MONITORING/TESTING REQUIREMENTS EU 1, EU 2, EU 3, EU 4 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 40 CFR Part 75 for SO 2, and NOx . Monitor actual net electrical output, expressed in megawatt- hours. Actual net electrical output shall be provided for individual units and as a facility total for all units included in the calculation demonstrating compliance. EU 1, EU 2, EU 3

In accordance with 310 CMR 7.29(7)(g) , operate each continuous emission monitoring system at 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
.Dominion Energy Brayton Point, LLC 04/12/12 Amended ECP Final Approval

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Page 8 of 12 **Table 4 *** EU# RECORD KEEPING REQUIREMENTS EU 1 EU 2 EU 3 EU 4 Maintain a record of actual emissions for each regulated pollutant for each of the preceding 12 months. Actual emissions shall be recorded for individual units and as a facility total for all units included in the calculation demonstrating compliance. Actual emissions provided under this section shall be recorded in accordance with 40 CFR Part 75 for SO 2, and NOx Maintain a record of actual net electrical output for each of the preceding 12 months, expressed in 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 12 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 and as a facility total for all units included in the calculation demonstrating compliance. Keep all measurements, data, reports and other information required by 310 CMR 7.29 on -site for a minimum of five years, or any other period consistent with the affected facility's Operating Permit. EU 1 EU 2 EU 3

In accordance with 310 CMR 7.29(7) , by January 30 of the year following the earliest applicable

compliance date and January 30 of 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.Dominion Energy Brayton Point, LLC 04/12/12 Amended ECP Final Approval

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**Table 5 *** EU# REPORTING REQUIREMENTS EU 1 EU 2 EU 3 EU 4 By January 30 of the year following the earliest applicable compliance date for the affected facility under 310 CMR 7.29(6)(c), and January 30 of each calendar year thereafter, the company representative responsible for compliance shall submit a compliance report to the Department demonstrating the facility’s compliance status with th e emission standards contained in 310 CMR 7.29(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 The 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 New England Independent System Operator (ISO), or any successor thereto. EU 1 EU 2 EU 3

Submit to the appropriate Department regional office a comp liance report in accordance with 310 CMR 7.29( 7)(b). EU 1 EU 2 EU 3

FACIL ITY
**Table 5 Notes:** 1. If the ISO final 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**Dominion Energy Brayton Point, LLC 04/12/12 Amended ECP Final Approval

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Page 10 of 12 The affected facility shall be in full compliance with the applicable requirements in accordance with the dates below: **TABLE 6 *** **COMPLIANCE PATH POLLUTANT**  **STANDARD DATE**  NOx SO 2 310 CMR 7.29(5)(a)1.a. 310 CMR 7.29(5)(a)2.a. October 1, 2006
NOx SO 2 310 CMR 7.29(5)(a )1.b. 310 CMR 7.29(5)(a)2.b. October 1, 2008

Details of the compliance schedule/milestones are described in Section H of the amended ECP application.Dominion Energy Brayton Point, LLC 04/12/12 Amended ECP Final Approval

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**4. SPECIAL CONDITIONS FOR ECP** 1. The Department may verify compliance with 310 CMR 7.29(5) by whatever means necessary, includin g but not limited to: inspection of a unit's operating records; requiring the facility to submit information on actual el ectrical output of company generating units provided to that person by the New England Independent System Operator, or any successor th ereto; testing emission monitoring devices; and, requiring the facility to conduct emissions testing under the supervision of the Department. 2. 3. Do minion shall not use 310 CMR 7. 29 SO 2 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 resul t 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 neg ate the responsibility of the facility to comply with this or any other applicable federal, state, or local regulations now or in the future. N or does this Amended ECP Final Approval imply compliance with any other applicable federal, state, or local regu lations 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 unless otherwise 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. Enclosed is a stamped approved copy of the Amended ECP application.Dominion Energy Brayton Point, LLC 04/12/12 Amended ECP Final Approval

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Page 12 of 12 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. Ida McDonnell, U.S. EPA New England, Region 1, Boston, MA Somerset Board of Selectmen Marilyn Levenson , Mass DEP- Boston Nancy Seidman , Mass DEP- Boston Glenn Keith, MassDEP
- Boston Eileen Hiney, MassDEP
- Boston Yi Tian, Mass DEP- Boston William Lamkin, Mass DEP- NERO David Johnston, Mass DEP- SERO Laurel Carlson, MassDEP
- SERO Charlie Kitson, MassDEP- SERO Laura Black, Mass DEP- SERO