Page 1 of 26 

### 40 CFR 49.5512

This document is current through the April 11, 2016 issue of the Federal Register



### § 49.5512 Federal Implementation Plan Provisions for Four Corners Power Plant,

Navajo Nation.

(a) Applicability. The provisions of this section shall apply to each owner or operator of the coal

burning equipment designated as Units 1, 2, 3, 4, and 5 at the Four Corners Power Plant (the

Plant) on the Navajo Nation Indian Reservation located in the Four Corners Interstate Air Quality

Control Region ( see 40 CFR 81.121 ). U nits 1, 2, and 3 at the Four Corners Power Plant

permanently ceased operation by January 1, 2014, pursuant to the requirements of paragraph

(i)(3).

(b) Compliance Dates. Compliance with the requirements of this section is required upon the

effective date of this rule unless otherwise indicated by compliance dates contained in specific

provisions.

(c) Definitions. For the purposes of this section paragraphs (a)

– (j) :

(1) [reserved] Affirmative defense means, in the context of an enforcement proceeding, a

response or defense put forward by a defendant, regarding which the defendant has the

burden of proof, and the merits of which are independently and objectively evaluated in a

judicial or administrative proceeding.

(2) Air pollution control equipment includes baghouses, particulate or gaseous scrubbers,

and any other apparatus utilized to control emissions of regulated air contaminants which

would be emitted to the atmosphere.

(3) Business Day. Business day means a normal working day, excluding weekends and

Federal Holidays.

(4) Daily average means the arithmetic average of the hourly values measured in a 24

- hour

period.

(5) Excess emissions means the emissions of air contaminants in excess of an applicable

emissions limitation or requirement.

(6) Heat input means heat derived from combustion of fuel in a Unit and does not include

the heat input from preheated combustion air, recirculated flue gases, or exhaust gases from

other sources. Heat input shall be in accordance with 40 CFR Part 75.

(7) Malfunction means any sudden and unavoidable failure of air pollution control

equipment or process equipment or of a process to operate in a normal or usual manner.

Failures that are caused entirely or in part by poor maintenance, careless operation, or any

other preventable upset condition or preventable equipment breakdown shall not be

considered malfunctions

. This rule provides an affirmative defense to actions for penalties

brought for excess emissions that arise during certain malfunction episodes. An affirmativePage 2 of 26 defense is not available if during the period of excess emissions, there was an exceedance of

the relevant ambient air quality standard that could be attributed to the emitting source.

(8) Owner or Operator means any person who owns, leases, operates, controls, or supervises

the Plant or any of the coal burning equipment designated as Units 1, 2, 3, 4, or 5 at the

Plant.

(9) Oxides of nitrogen (NO

x ) means the sum of nitric oxide (NO) and nitrogen dioxide (NO 2 )

in the flue gas, expressed as nitrogen dioxide.

(10) Plant

- wide basis means total stack emissions of any particular pollutant from all coal

burning equipment at the Plant.

(11) Regional Administrator means the Regional Administrator of the Environmenta l

Protection Agency (EPA) Region 9 or his/her authorized representative.

(12) Shutdown means the cessation of operation of any air pollution control equipment,

process equipment, or process for any purpose. Specifically, for Units 1, 2, or 3, shutdown

begins when the unit drops below 40 MW net load with the intent to remove the unit from

service. For Units 4 or 5, shutdown begins when the unit drops below 300 MW net load with

the intent to remove the unit from service.

(13) Startup means the setting into operation of any air pollution control equipment, process

equipment, or process for any purpose. Specifically, for Units 1, 2, or 3, startup ends when

the unit reaches 40 MW net load. For Units 4 or 5, startup ends when the unit reaches 400

MW net load.

(14) 24

- hour period means the period of time between 12:01 a.m. and 12 midnight.

(d) Emissions Standards and Control Measures . The following emission limits shall apply at all

times.

–

(1) Sulfur Dioxide. No owner or operator shall discharge or cause the discharge of sulfur dioxide

(SO 2 ) into the atmosphere in excess of:

(i) 12.0 percent of the potential combustion concentration assuming all of the sulfur in the

coal is converted to SO 2

. This percent emitted is determined by a daily calculation of the

plantwide heat input weighted annual average.

(ii) 17,900 pounds of total SO 2 emissions per hour averaged over any consecutive three (3)

hour period, determined on a plant

- wide basis.

(2) Particulate Matter. No owner or operator shall discharge or cause the discharge of particulate

matter from any coal burning equipment into the atmosphere in excess of 0.050 pounds per

million British thermal unit (lb/MMBtu) of heat input (higher heating value) , as averaged from

three sampling runs, each at 60 minutes in duration, each collecting a minimum sample of 30

dry standard cubic feet

.

(3) [reserved] Dust. Each owner or operator shall operate and maintain the existing dust

suppression methods for controlling dust from the coal handling and storage facilities. Within

ninety (90) days after promulgation of this section, the owner or operator shall submit to thePage 3 of 26 Regional Administrator a description of the dust suppression methods for controlling dust from

the coal handling and storage facilities, flyash handling and storage, and road sweeping

activities. Within 548 days of promulgation of this section e E ach owner or operator shall not

emit dust with an opacity greater than 20 percent from any crusher, grinding mill, screening

operation, belt conveyor, or truck loading or unloading operation.

(4) Opacity. No owner or operator shall discharge or cause the discharge of emissions from the

stacks of Units 4 and 5 into the atmosphere exhibiting greater than 20% opacity, excluding

uncombined water droplets, averaged over any six (6) minute period, except for one six (6)

minute period per hour of not more than 27% opacity. This paragraph (d)(4), and associated

requirements in paragraphs (e) and (f) to demonstrate compliance with the opacity standard

shall not apply to A a ny unit for which the owner or operator installs, calibrates, maintains, and

operates particulate matter CEMS under paragraph (e)(3) to demonstrate compliance with its

PM emission limitation in paragraph (i)(1) shall be exempt from the opacity standard in this

paragraph (d)(4), and associated requirements in paragraphs (e) and (f) to demonstrate

compliance with the opacity standard

.

(5) Oxides of nitrogen. No owner or operator shall discharge or cause the discharge of NO

x into

the atmosphere in excess of the amounts specified below

.

(i) From either Unit 1 or 2 in excess of 0.85 lb/MMBtu of heat input per unit, and

from either Units 3, 4, or 5 in excess of 0.65 lb/MMBtu of heat input per unit

averaged over any successive thirty (30) boiler operating day period from Units 4

and 5 ;

(ii) In excess of 335,000 lb per 24

- hour period when coal burning equipment is

operating, on a plant

- wide basis; for each hour when coal burning equipment is not

operating, this limitation shall be reduced. If the unit which is not operating is Unit

1, 2, or 3, the limitation shall be reduced by 1,542 lb per hour for each unit which is

not operating. If the unit which is not operating is Unit 4 or 5, the limitation shall be

reduced by 4,667 lb per hour for each unit which is not operating.

(e) Testing and Monitoring. Upon completion of the installation of continuous emissions

monitoring systems (CEMS) software as required in this section, c C ompliance with the

emissions limits set for SO 2 and NO

x shall be determined by using data from a CEMS unless

otherwise specified in paragraphs (e)(2) and (e)(4) of this section. Compliance with the emissions

limit set for particulate matter shall be tested annually, or at such other time as requested by the

Regional Administrator, based on data from testing conducted in accordance with 40 CFR part

60, appendix A, Methods 1 through 5, or any other method receiving prior written approval from

the Regional Administrator. Compliance with the emissions limits set for opacity shall be

determined by using data from a Continuous Opacity Monitoring System (COMS) except during

saturated stack conditions (uncombined water droplets)

. If the baghouse is operating within its

normal operating parameters, the baghouse is not fully closed, and a high opacity reading occurs,

it will be presumed that the occurrence was caused by saturated stack conditions and shall not

be considered a violation.

(1) The owner or operator shall maintain and operate CEMS for SO 2 , NO or NO

x , a diluent

and, for Units 4 and 5 only, COMS, in accordance with 40 CFR 60.8 and 60.13

, and appendix

B of 40 CFR part 60. Within six (6) months of promulgation of this section, the owner or

operator shall install CEMS and COMS software which complies with the requirements ofPage 4 of 26 this section. The owner or operator of the Plant may petition the Regional Administrator for

extension of the six (6) month period for good cause shown. Completion of 40 CFR part 75

monitor certification requirements shall be deemed to satisfy the requirements under 40 CFR

60.8 and 60.13 and appendix B of part 60. The owner or operator shall comply with the

quality assurance procedures for CEMS found in 40 CFR part 75, and all reports required

thereunder shall be submitted to the Regional Administrator.

The owner or operator shall provide the Regional Administrator notice in accordance with

40 CFR 75.61

.

(2) Sulfur Dioxide. For the purpose of determ ining compliance with this section, the sulfur

dioxide inlet concentration (in lb/MMBtu) shall be calculated using the daily average percent

sulfur and Btu content of the coal combusted , or after the installation of the SO2 and any

diluent CEMS required under paragraph (k)(3)(v), compliance with the provisions of

paragraph (k)(3)(vi)

. If the sulfur dioxide inlet concentration is calculated, t T t he inlet sulfur

concentration and Btu content shall be determined in accordance with American Society for

Testing and Materials (ASTM) methods or any other method receiving prior approval from

the Regional Administrator. A daily fuel sample shall be collected using the coal sampling

tower conforming to the ASTM specifications. The analyses shall be done on the daily

sample using ASTM methods or any other method receiving prior approval from the

Regional

Administrator.

(i) The inlet sulfur dioxide concentration shall be calculated using the following formula:

I

s = 2(%S f )/GCV x 10 4 English units

Where:

I

s = sulfur dioxide inlet concentrations in pounds per million Btu;

%S f = weight percent sulfur content of

the fuel; and

GCV = Gross calorific value for the fuel in Btu per pound.

(ii) The total pounds of SO 2 generated by burning the coal shall be calculated by

multiplying the S O 2 inlet concentration by the daily total heat input determined by the

40 CFR Part 75 acid rain monitoring. This will determine the pounds of SO 2 produced

per day. The SO 2 emitted from the stacks shall be determined by adding the daily SO 2

emissions from each stack as determined by the 40 CFR Part 75 acid rain monitors.

Compliance with the emission limit shall be determined for each day by adding that

day’s SO 2 emissions and that day’s SO 2 produced to the previous 364 days and then

dividing the 365 days of emissions by the 365 days of SO 2 produced. Compliance is

demonstrated if this fraction, converted to a percent, is equal to or less than 12.0 percent.

The data from the 40 CFR Part 75 monitors shall not be bias adjusted. If a valid SO 2

pounds per hour or heat input is not available for any hour for a unit, that heat input and

SO 2 pounds per hour shall not be used in the calculation of the annual plant

- wide

average.Page 5 of 26 (3) The provisions of this paragraph (e)(3) shall apply on [INSERT DATE 30 DAYS

AFTER PUBLICATION IN THE FEDERAL REGISTER ] . Following modifications to

Unit 4 and Unit 5 to withstand wet stack conditions required in paragraph (k)(ii) and (iii),

the compliance date for this paragraph (e)(3) is no later than March 31, 2018 for Unit 5 and

July 31, 2018 for Unit 4

. To assure continuous compliance with the particulate matter

limits in paragraph (d)(2) and (i)( 1)

, the owner or operator shall either conduct quarterly

particulate matter testing in accordance with the testing specifications outlined in Table 5

of 40 CFR part 63 subpart UUUUU; or install, calibrate, operate, and maintain a

continuous parametric monitoring system (CPMS) for that unit in accordance with 40

CFR part 63 subpart UUUUU; or install, calibrate, maintain, and operate particulate

matter CEMS in accordance with 40 CFR part 63 subpart UUUUU. The owner or

operator shall submit a written notification to the Regional Administrator

, in accordance

with paragraph (f), of intent to demonstrate compliance with this paragraph by using a PM

CEMS. This notification shall be sent at least 30 calendar days before the initial

startup of the monitor for compliance determination purposes. The owner or operator may

discontinue operation of the monitor and instead return to demonstration of compliance

with this paragraph using quarterly PM testing by submitting written notification to the

Regional Administrator

, in accordance with paragraph (f), of such intent at least 30

calendar days before shutdown of the monitor for compliance determination purposes.

Nothing in this paragraph replaces or supersedes the requirements for PM CEMS in the

August 17, 2015 Consent Decree under paragraph (k). Particulate Matter. Particulate

matter emissions shall be determined by averaging the results of three test runs. Each test

run shall be sixty (60) minutes in duration and shall collect a minimum volume of thirty

(30) dry standard cubic feet. Within six (6) months of promulgation of this section,

particulate matter testing shall be conducted annually and at least six (6) months apart,

with the equipment within 90 percent of maximum operation in acc ordance with 40 CFR

60.8 and Appendix A to 40 CFR Part 60. The owner or operator shall submit written

notice of the date of testing no later than 21 days prior to testing. Testing may be performed

on a date other than that already provided in a notice as long as notice of the new date is

provided either in writing or by telephone or other means acceptable to the Region 9

Enforcement Office, and the notice is provided as soon as practicable after the new testing

date is known, but no later than 7 days (or a shorter period as approved by the Region 9

Enforcement Office) in advance of the new date of testing.

(4) Oxides of nitrogen. The total daily plant

- wide oxides of nitrogen emissions in pounds of

NO 2 per day shall be calculated using the following formula:

TTTTTTTT =

nnnn

iiii =1 mmmm

ii ii = 1 TTTT iiiiiiii × HHHH iiiiiiii ∑ ∑Page 6 of 26 Where:

TE = total plant

- wide nitrogen dioxide emissions (lb

NO 2 /day); E ij = hourly average emissions rate of each

unit (lb NO 2 /MMBtu); H ij = hourly total heat input for

each unit (MMBtu);

n = the number of units of coal burning equipment operating during the hour;

m = the number of operating hours in a day, from midnight to midnight.

(5) Continuous emissions monitoring shall app ly during all periods of operation of the coal

burning equipment, including periods of startup, shutdown, and malfunction, except for

CEMS breakdowns, repairs, calibration checks, and zero and span adjustments. Continuous

monitoring systems for measuring SO 2 , NO

x , and diluent gas shall complete a minimum of

one cycle of operation (sampling, analyzing, and data recording) for each successive 15

-

minute period. Hourly averages shall be computed using at least one data point in each

fifteen minute quadrant of an hour. Notwithstanding this requirement, an hourly average

may be computed from at least two data points separated by a minimum of 15 minutes

(where the unit operates for more than one quadrant in an hour) if data are unavailable as a

result of performance of calibration, quality assurance, preventive maintenance activities, or

backups of data from data acquisition and handling system, and recertification events. When

valid SO 2 pounds per hour, NO 2 pounds per hour, or NO 2 pounds per million Btu emission

data are not obtained because of continuous monitoring system breakdowns, repairs,

calibration checks, or zero and span adjustments, emission data must be obtained by using

other monitoring systems approved by the EPA to provide emission data for a minimum of

18 hours in at least 22 out of 30 successive boiler operating days. If a parameter essential for

determining either the SO 2 pound per hour or the heat input is not valid or unavailable, that

hour for that unit shall not be used in calculating the percent emissions of SO 2 for the plant

wide limit. The necessary software for determining compliance with the SO 2 plantwide

annual average shall be installed and operating within 180 days of the effective date of this

rule. The first day for determining compliance with the plantwide SO 2 limit shall be 365

days after the successful installation of the software.

(6) The provisions of this paragraph (e)(6) shall apply on [ INSERT DATE 30 DAYS

AFTER PUBLICATION IN THE FEDERAL REGISTER ]. By [ INSERT DATE 6 0

DAYS AFTER PUBLICATION IN THE FEDERAL REGISTER ], the operator must

notify the EPA of the option it chooses to demonstrate compliance with the opacity

standard. Following modifications to Unit 4 and Unit 5 to wet stacks required in paragraph

(k)(ii) and (iii), the compliance date for this paragraph (e)(6) is no later than March 31,

2018 for Unit 5 and July 31, 2018 for Unit 4 . The option in paragraph (e)(6)(i) is available

only until March 31, 2018 for Unit 5 and July 31, 2018 for Unit 4. Fo r the period of time

after the operator has completed modifications to wet stacks pursuant to paragraph

(k)(3)(ii) and (iii) but before the compliance dates in paragraphs (k)(3)(ii) and (iii) of

March 31, 2018 for Unit 5 and July 31, 2018 for Unit 4, the operator may use either the

provisions in paragraph (e)(6)(i) to demonstrate compliance with the opacity standard,

except that the visible emission performance testing sha ll be conducted weekly instead of

for the duration of the saturated stack condition, or the provisions of paragraph (d)(4) soPage 7 of 26 that the opacity standard does not apply except that the PM CEMS must demonstrate

compliance with a PM emission limitation of 0.03 0 lb/MMBtu. By April 30, 2018 for Unit

5 and August 30, 2018 for Unit 4, the operator must notify the EPA of the option it

chooses to demonstrate compliance with the opacity standard. If the opacity standard in

paragraph (d)(4) applies, the owner or operat or shall demonstrate compliance with the

opacity standard using one of the following options:

(i) operate Continuous Opacity Monitoring Systems (COMS) and The owner or operator

shall maintain a set of opacity filters to be used as audit standards. Compliance with the

opacity standard during periods of dry (unsaturated) stack conditions shall be

determined using COMS. Compliance with the opacity standard during periods of wet

(saturated) stack conditions shall be determined using visible emission performance

testing specified in 40 CFR part 60 appendix A

- 4, Method 9, during the duration of the

saturated stack condition, or

(ii) install, calibrate, operate, and maintain a continuous parametric monitoring system

(CPMS) for that unit in accordance with 40 CFR part 63 subpart UUUUU, including the

requirements for the development of site

- specific monitoring plans and recordkeeping

and reporting; and conduct periodic performance testing of visible emissions using the

procedures specified in paragraphs 40 CFR 60.49Da(a)(3 ), or

(iii) monitor performance of the baghouses using a bag leak detection system in

accordance with 40 CFR 60.48Da(o)(4), or an alternative bag leak detection system

approved by the EPA, including requirements for the development of site

- specific

monitoring plans and recordkeeping and reporting; and conduct periodic performance

testing of visible emissions using the procedures specified in paragraph 40 CFR

60.49Da(a)(3).Page 8 of 26 (7) Nothing herein shall limit EPA’s ability to ask for a test at any time under Section 114

of the Clean Air Act, 42 U.S.C. 7414, and enforce against any violation.

(8) In order to provide reasonable assurance that the scrubbers for control of particulate

matter from Units 1, 2, and 3 are being maintained and operated in a manner consistent with

good air pollution control practice for minimizing emissions, the owner or operator shall

comply with the following provisions:

(i) The owner or operator shall develop a plan to monitor, record, and report parameter(s)

indicative of the proper operation of the scrubbers to provide a reasonable assurance of

compliance with the particulate matter limits in paragraph (d)(2) of this section. The

owner or operator shall submit this plan to the Regional Administrator no later than sixty

(60) days after the effective date of this FIP. The owner or operator shall implement this

plan within 90 days of approval by the Regional Administrator and shall commence

reporting the data generated pursuant to the monitoring plan in accordance with the

schedule in paragraph (e)(8)(v) of this section. If requested by the Regional

Administrator, this plan shall be revised and submitted to the Regional Administrator

for approval within sixty (60) days of the request. The revised plan shall be implemented

within sixty (60) days of the Regional Administrator’s approval.

(ii) In the event that the owner or operator is unable to develop the plan required in

paragraph (e)(8)(i) of this section due to technical difficulties, fails to submit the plan

within sixty (60) days of the effective date of this FIP, or the Regional Administrator

disapproves the plan, the owner or operator shall install and operate devices to measure

the pressure drop across each scrubber module and the total flow of scrubbing liquid to

the venturi section of each scrubber module. The data from these instruments shall be

monitored and recorded electronically. A minimum of one reading every 15 minutes

shall be used to calculate an hourly average which shall be recorded and stored for at

least a five

- year period. The owner or operator shall report in an electronic format either

all hourly data, or one

- hour averages deviating by more than 30 percent from the levels

measured during the last particulate matter stack test that demonstrated compliance with

the limit in this section. The owner or operator shall implement this requirement no later

than one hundred eighty (180) days after the effective date of this FIP if it failed to

submit the plan within sixty (60) days after the effective date of this FIP; or no later than

60 days after the Regional Administrator’s disapproval of the plan.

(iii) The monitoring required under paragraphs (e)(8)(i) and (e)(8)(ii) of this section shall

apply to each Unit at all times that the Unit is operating, except for monitoring

malfunctions, associated repairs, and required quality assurance or control activities

(including, as applicable, calibration checks and required zero and span adjustments). A

monitoring malfunction is any sudden, infrequent, not reasonably preventable failure of

the monitoring to provide valid data. Monitoring failures that are caused in part by poor

maintenance or careless operation are not malfunctions.Page 9 of 26 (iv) The owner or operator may petition the Regional Administrator for an extension of

the sixty (60) day deadline. Such extension shall be granted only if the owner or operator

demonstrates to the satisfaction of the Regional Administrator that:

(A) The delay is due to technical infeasibility beyond the control of the owner or

operator; and

(B) The requested extension, if granted, will allow the owner or operator to

successfully complete the plan.

(v) The owner or operator shall submit to the Regional Administrator reports of the

monitoring data required by this section semi

- annually. The reports shall be postmarked

within 30 days of the end of each calendar quarter.

(vi) The owner or operator shall develop and document a quality assurance program for

the monitoring and recording instru mentation. This program shall be updated or

improved as requested by the Regional Administrator.

(vii) In the event that a program for parameter monitoring on Units 1, 2, and 3 is approved

pursuant to the Compliance Assurance Monitoring rule, 40 CFR Part 64, such program

will supersede the provisions contained in paragraph (e)(8) of this section.

(f) Reporting and Recordkeeping Requirements. Unless otherwise stated a A ll requests, reports,

submittals, notifications, and other communications to the Regional Administrator

, or

Administrator , or EPA, required by this section paragraph (f) section and references therein

, shall be submitted

, unless instructed otherwise, to the Director, Navajo Environmental

Protection Agency, P.O. Box 339, Window Rock, Arizona 86515, (928) 871

- 7692, (928) 871

-

7996 (facsimile) ;, and to the Director, Air Division Regional Administrator

, U.S.

Environmental Protection Agency, Region IX, to the attention of Mail Code: AIR

- 3 5 ORA

- 1

,

at 75 Hawthorne Street, San Francisco, California 94105, (415) 972

- 39 74 90 947

- 8000

. , (415) 947

- 3579 (facsimile) ; , or by email at and to the Director, Enforcement Division, U.S.

Environmental Protection Agency, to the attention of Mail Code ENF

- 2

- 1, at 75 Hawthorne

Street, San Francisco, California, 94105, (415) 972

- 3982, or by email to r9.aeo@epa.gov

. For

each unit subject to the emissions limitation in this section and upon completion of the

installation of CEMS and COMS as required in this section, the owner or operator shall comply

with the following requirements:

(1) For each emissions limit in this section, comply with the notification and recordkeeping

requirements for CEMS and COMS compliance monitoring in 40 CFR 60.7(c) and (d)

, and

for visible emissions testing, if applicable under paragraph (e)(6), record and report results

of the tests in accordance with 40 CFR 60.7(d)

. For Units 4 and 5, periods of excess opacity

due to water droplets shall be reported in the summary report required by 40 CFR 60.7(d)

.

(2) For each day, provide the 365 day percent SO 2 emitted, the total SO 2 emitted that day,

and the total SO 2 produced that day. For any h ours on any unit where data for SO 2 hourly

pounds or heat input is missing, identify the unit number and monitoring device that did not

produce valid data that caused the missing hour.Page 10 of 26 (3) Furnish the Regional Administrator with reports describing the results of the annual

particulate matter emissions tests postmarked within sixty (60) days of completing the tests.

Each report shall include the following information:

(i) The test date;

(ii) The test method;

(iii) Identification of the coal burning equipment tested;

(iv) Values for stack pressure, temperature, moisture, and distribution of velocity heads;

(v) Average heat input;

(vi) Emissions data, identified by sample number, and expressed in pounds per

MMBtu;

(vii) Arithmetic average of sample data expressed in pounds per MMBtu; and

(viii) A description of any variances from the test method.

(4) Excess Emissions Report.

(i) For excess emissions (except in the case of saturated stack conditions) , the owner or

operator shall notify the Navajo Environmental Protection Agency Director and the U.S.

Environmental Protection Agency Regional Administrator by telephone or in writing

within one business day (initial notification). A complete written report of the incident

shall be submitted to the Navajo Environmental Protection Agency Director and the U.S.

Environmental Protection Agency Regional Administrator within ten (10) working days

of the initial notification. The complete written report shall include: This notification

should be sent to the Director, Navajo Environmental Protection Agency, by mail to:

P.O. Box 339, Window Rock, Arizona 86515, or by facsimile to: (928) 871

- 7996

(facsimile), and to the Regional Administrator, U.S. Environmental Protection Agency,

by mail to the attention of Mail Code: AIR

- 5, at 75 Hawthorne Street, San Francisco,

California 94105, by facsimile to: (415) 947

- 3579 (facsimile), or by e

- mail to:

r9.aeo@epa.gov

. The complete written report shall include:

(A) The name and title of the person reporting;

(B) The identity and location of the Plant and Unit(s) involved, and the emissions

point(s), including bypass, from which the excess emissions occurred or are

occurring;

(C) The time and duration or expected duration of the exc ess emissions;

(D) The magnitude of the excess emissions expressed in the units of the applicable

emissions limitation and the operating data and calculations used in determining the

magnitude of the excess emissions;

(E) The nature of the condition causing the excess emissions and the reasons why

excess emissions occurred or are occurring;P a g e 1 0 o f 13

Page 11 of 26 (F) If the excess emissions were the result of a malfunction, the steps taken to remedy

the malfunction and the steps taken or planned to prevent the recurrence of such

malfunction;

(G) For an opacity exceedance, the 6

- minute average opacity monitoring data or

visible emission performance test results greater than 20 percent for the 24 hours

prior to and during the exceedance for Units 4 and 5; and

(H) The efforts taken or being taken to minimize the excess emissions and to repair

or otherwise bring the Plant into compliance with the applicable emissions limit(s)

or other requirements. For this reporting requirement, excess opacity due to saturated

stack conditions is exempted.

(ii) If the period of excess emissions extends beyond the submittal of the written report,

the owner or operator shall also notify the Navajo Environmental Protection Agency

Director and EPA Regional Administrator in writing of the exact time and date when

the excess emissions stopped. Compliance with the excess emissions notification

provisions of this section shall not excuse or otherwise constitute a defense to any

violations of this section or of any law or regulation which such excess emissions or

malfunction may cause.

(g) Equipment Operations. At all times, including periods of startup, shutdown, and malfunction,

the owner or operator shall, to the extent practicable, maintain and operate the Plant including

associated air pollution control equipment in a manner consistent with good air pollution control

practices for minimizing emissions. Determination of whether acceptable operating and

maintenance procedures are being used will be based on information available to the Regional

Administrator which may include, but is not limited to, monitoring results, opacity observations,

review of operating and maintenance procedures, and inspection of the Plant. With regard to the

operation of the baghouses on Units 4 and 5, placing the baghouses in service before coal fires

are initiated will constitute compliance with this paragraph. (If the baghouse inlet temperature

cannot achieve 185 degrees Fahrenheit using only gas fires, the owner or operator will not be

expected to place baghouses in service before coal fires are initiated; however, the owner or

operator will remain subject to the requirements of this paragraph.)

(h) Enforcement.

(1) Notwithstanding any other provision in this implementation plan, any credible evidence

or information relevant to whether the Plant would have been in compliance with applicable

requirements if the appropriate performance or compliance test had been performed, can be

used to establish whether or not the owner or operator has violated or is in v iolation of any

standard in the plan.

(2) During periods of startup and shutdown the otherwise applicable emission limits or

requirements for opacity and particulate matter shall not apply provided that:

(i) At all times the facility is operated in a manner consistent with good practice for

minimizing emissions, and the owner or operator uses best efforts regarding planning,

design, and operating procedures to meet the otherwise applicable emission limit;Page 11 of 26 (ii) The frequency and duration of operation in start

- up or shutdown mode are minimized

to the maximum extent practicable; and

(iii) The owner or operator’s actions during start

- up and shutdown periods are

documented by properly signed, contemporaneous operating logs, or other relevant

evidence.

(3) Emissions in excess of the level of the applicable emission limit or requirement that occur

due to a malfunction shall constitute a violation of the applicable emission limit. However,

it shall be an affirmative defense in an enforcement action seeking penalties if the owner or

operator has met with all of the following conditions:

(i) The malfunction was the result of a sudden and unavoidable failure of process or air

pollution control equipment or of a process to operate in a nor mal or usual manner;

(ii) The malfunction did not result from operator error or neglect, or from improper

operation or maintenance procedures;

(iii) The excess emissions were not part of a recurring pattern indicative of inadequate

design, operation, or maintenance;

(iv) Steps were taken in an expeditious fashion to correct conditions leading to the

malfunction, and the amount and duration of the excess emissions caused by the

malfunction were minimized to the maximum extent practicable;

(v) All possible steps were taken to minimize the impact of the excess emissions on

ambient air quality;

(vi) All emissions monitoring systems were kept in operation if at all possible; and

(vii) The owner or operator’s actions in response to the excess emissions were

documented by properly signed, contemporaneous operating logs, or other relevant

evidence.

(i) Regional Haze Best Available Retrofit Technology limits for this plant are in addition to the

requirements of paragraphs (a) through (h) of this section. All definitions and testing and

monitoring methods of this section apply to the limits in this paragraph (i) except as indicated in

paragraphs (i)(1) through (4) of this section. The interim NO

x emission limit in paragraph

(i)(2)(ii) of this section shall be effective 180 days after re

- start of the unit after installation of

add

- on post

- combustion NO

x controls for that unit and until the plant

- wide limit goes into effect.

The plant

- wide NO

x limit shall be effective no later than 5 years after October 23, 2012. The

owner or operator may elect to meet the plant

- wide limit early to remove the individual unit

limits. Particulate limits for Units 4 and 5 shall be effective 60 days after restart following the

scheduled major outage for Units 4 and 5 in 2013 and 2014.

(1) Particulate Matter from Units 4 and 5 shall be limited to 0.015 lb/MMBtu for each unit

. Particulate matter testing shall be performed in accordance with paragraph (e)(3) of this

section. as measured by the average of three test runs with each run collecting a minimum

of 60 dscf of sample gas and with a duration of at least 120 minutes. Sampling shall be

performed according to 40 CFR Part 60 Appendices A

- 1 through A

- 3, Methods 1 through 4Page 12 of 26 and Method 5 or Method 5e. The averaging time for any other demonstration of the

particulate matter compliance or exceedance shall be based on a 6

- hour average. Particulate

testing shall be performed annually as required by paragraph (e)(3) of this section. This test

with 120 minute test runs may be substituted and used to demonstrate compliance with the

particulate limits in paragraph (d)(2) of this section.

(2) Plant

- wide nitrogen oxide emission limits.

(i) The plant

- wide nitrogen oxide limit, expressed as nitrogen dioxide (NO 2 ), shall be

0.11 lb/MMBtu as averaged over a rolling 30

- calendar day period. NO

x emissions for

each calendar day shall be determined by summing the hourly emissions measured as

pounds of NO 2 for all operating units. Heat input for each calendar day shall be

determined by adding together all hourly heat inputs, in millions of Btu, for all operating

units. Each day the rolling 30

- calendar day average shall be determined by adding

together that day’s and the preceding 29 days’ pounds of NO 2 and dividing that total

pounds of NO 2 by the sum of the heat input during the same 30

- day period. The results

shall be the rolling 30

- calendar day

- average pound per million Btu emissions of NO

x

.

(ii) The interim NO

x limit for the first 750 MW boiler retrofitted with add

- on post

combustion NO

x control shall be 0.11 lb/MMBtu, based on a rolling average of 30

successive boiler operating days.

(iii) Schedule for add

- on post

- combustion NO

x controls installation

(A) Within 4 years of the effective date of this rule, FCPP shall have installed add

on post

- combustion NO

x controls on at least 750 MW (net) of generation to meet

the interim emission limit in paragraph (i)(2)(ii) (A) of this section.

(B) Within 5 years of the effective date of this rule, FCPP shall have installed add

on post

- combustion NO

x controls on all 2060 MW (net) of generation to meet the

plant

- wide emission limit for NO

x in paragraph (i)(2)(i) of this section.

(iv) Testing and monitoring shall use the 40 CFR part 75 monitors and meet the 40 CFR

part 75 quality assurance requirements. In addition to these 40 CFR part 75

requirements, relative accuracy test audits shall be performed for both the NO

x pounds

per hour measurement and the heat input measurement. These shall have relative

accuracies of less than 20 percent. This testing shall be evaluated each time the 40 CFR

part 75 monitors undergo relative accuracy testing.

(v) If a valid NO

x pounds per hour or heat input is not available for any hour for a unit,

that heat input and NO

x pounds per hour shall not be used in the calculation of the 30

day plant

- wide rolling average.

(vi) Upon the effective date of the plant

- wide NO

x average, the owner or operator shall

have installed CEMS and COMS software that complies with the requirements of this

section.

(3 ) In lieu of meeting the NO

x requirements of paragraph (i)(2) of this section, FCPP may

choose to permanently shut down Units 1, 2, and 3 by January 1, 2014 and meet the

requirements of this paragraph to control NO

x emissions from Units 4 and 5. By July 31,Page 13 of 26 2018, Units 4 and 5 shall be retrofitted with add

- on post

- combustion NO

x controls to reduce

NO

x emissions. Units 4 and 5 shall each meet a 0.098 lb/MMBtu emission limit for NO

x

expressed as NO 2 based on a rolling average of 30 successive boiler operating days. A ′′ boiler

operating day ′′ is defined as any 24

- hour period between 12:00 midnight and the following

midnight during which any fuel is combusted at any time at the steam generating unit.

Emissions from each unit shall be measured with the 40 CFR part 75 continuous NO

x

monitor system and expressed in the units of lb/MMBtu and recorded each hour. A valid

hour of NO

x data shall be determined per 40 CFR part 75. For each boiler operating day,

every valid hour of NO

x lb/MMBtu measurement shall be averaged to determine a daily

average. Each daily average shall be averaged with the preceding 29 valid daily averages to

determine the 30 boiler operating day rolling average. The NO

x monitoring system shall

meet the data requirements of 40 CFR 60.49Da(e)(2) (at least 90 percent valid hours for all

operating hours over any 30 successive boiler operating days). Emission testing using 40

CFR part 60 Appendix A Method 7E may be used to supplement any missing data due to

continuous monitor problems. The 40 CFR part 75 requirements for bias adjusting and data

substitution do not apply for adjusting the data for this emission limit.

(4) By January 1, 2013, the owner or operator shall submit a letter to the Regional

Administrator updating EPA of the status of lease negotiations and regulatory approvals

required to comply with paragraph (i)(3) of this section. By December 31, 2013, the owner

or operator shall notify the Regional Administrator by letter whether it will comply with

paragraph (i)(2) of this section or whether it will comply with paragraph (i)(3) of this section

and shall submit a plan and time table for compliance with either paragraph (i)(2) or (3) of

this section. The owner or operator shall amend and submit this amended plan to the

Regional Administrator as changes occur.

(5) The owner or operator shall follow the requirements of 40 CFR part 71 for submitting an

application for permit revision to update its Part 71 operating permit after it achieves

compliance with paragraph (i)(2) or (3) of this section.

(j) Dust. Each owner or operator shall operate and maintain the existing dust suppression

methods for controlling dust from the coal handling and ash handling and storage facilities.

Within ninety (90) days after promulgation of this paragraph, the owner or operator shall develop

a dust control plan and submit the plan to the Regional Administrator. The owner or operator

shall comply with the plan once the plan is submitted to the Regional Administrator. The owner

or operator shall amend the plan as requested or needed. The plan shall include a description of

the dust suppression methods for controlling dust from the coal handling and storage facilities,

ash handling, storage, and landfills, and road sweeping activities. Within 18 months of

promulgation of this paragraph each owner or operator shall not emit dust with opacity greater

than 20 percent from any crusher, grinding mill, screening operation, belt conveyor, or truck

loading or unloading operation.

(k) Emission limitations from August 17, 2015 Consent Decree. The emission limitations and

other requirements from this paragraph (k), originally contained in a Consent Decree filed onPage 14 of 26 August 17, 2015 in the United States District Court for the District of New Mexico, are in

addition to the requirements in paragraphs (a) through (j) of this section.

(1) Definitions. Every term expressly defined in this paragraph (k) shall have the meaning

given that term herein. Every other term used in this paragraph (k) that is also a term used

under the Act or in a federal regulation implementing the Act shall mean what such term

means under the Act or those regulations.

(i) A “30

- Day Rolling Average NOx Emission Rate” for a Unit shall be expressed in

lb/MMBtu and calculated in accordance with the following procedure: first, sum the

total pounds of NOx emitted from the Unit during the current Unit Operating Day and

the previous twenty nine (29) Unit Operating Days; second, sum the total heat input to

the Unit in MMBtu during the current Unit Operating Day and the previous twenty

- nine

(29) Unit Operating Days; and third, divide the total number of pounds of NOx emitted

during the thirty (30) Unit Operating Days by the total heat input during the thirty (30)

Unit Operating Days. A new 30

- Day Rolling Average NOx Emission Rate shall be

calculated for each new Unit Operating Day. Each 30

- Day Rolling Average NOx

Emission Rate shall include all emissions that occur during all periods within any Unit

Operating Day, including emissions from startup, shutdown, and Malfunction.

(ii) A “30

- Day Rolling Average SO 2 Removal Efficiency” means the percent reduction

in the mass of SO 2 achieved by a Unit’s FGD system over a thirty (30) Unit Operating

Day period and shall be calculated as follows: step one, sum the total pounds of SO 2

emitted as measured at the outlet of the FGD system for the Unit during the current Unit

Operating Day and the previous twenty

- nine (29) Unit Operating Days as measured at

the outlet of the FGD system for that Unit; step two, sum the total pounds of SO 2

delivered to the inlet of the FGD system for the Unit during the current Unit Operating

Day and the previous twenty

- nine (29) Unit Operating Days as measured at the inlet to

the FGD system for that Unit (this shall be calculated by measuring the ratio of the

lb/MMBtu SO 2 inlet to the lb/MMBtu SO 2 outlet and multiplying the outlet pounds of

SO 2 by that ratio); step three, subtract the outlet SO 2 emissions calculated in step one

from the inlet SO 2 emissions calculated in step two; step four, divide the remainder

calculated in step three by the inlet SO 2 emissions calculated in step two; and step five,

multiply the quotient calculated in step four by 100 to express as a percentage of removal

efficiency. A new 30

- Day Rolling Average SO 2 Removal Efficiency shall be calculated

for each new Unit Operating Day, and shall include all emissions that occur during all

periods within each Unit Operating Day, including emissions from startup, shutdown,

and Malfunction.

(iii) “Annual Tonnage Limitation” means the limitation on the number of tons of the

pollutant in question that may be emitted from FCPP during the relevant calendar year

(i.e., January 1 through December 31), and shall include all emissions of the pollutant

emitted during periods of startup, shutdown and Malfunction.Page 15 of 26 (iv) “Baghouse” means a full stream (fabric filter) particulate emissions control device.

(v) “Clean Air Act” and “the Act” mean the federal Clean Air Act, 42 USC 7401

- 7671q,

and its implementing regulations.

(vi) “CEMS” and “Continuous Emission Monitoring System,” mean, for obligations

involving the monitoring of NOx and SO 2 emissions under this paragraph (k), the

devices defined in 40 CFR 72.2, and the SO 2 monitors required by this paragraph (k) for

determining compliance with the 30

- Day Rolling Average SO 2 Removal Efficiency

requirement set forth in this paragraph (k).

(vii) “Continuous Operation,” “Continuously Operate,” and “Continuously Operating”

mean that when a pollution control technology or combustion control is required to be

used at a Unit pursuant to this paragraph (k) (including, but not limited to, SCR, FGD,

or Baghouse), it shall be operated at all times such Unit is in operation, consistent with

the technological limitations, manufacturers’ specifications, good engineering and

maintenance practices, and good air pollution control practices for minimizing

emissions (as defined in 40 CFR 60.11(d)) for such equipment and the Unit.

(viii) “Day” means calendar day unless otherwise specifi ed in this paragraph (k).

(ix) “Emission Rate” means, for a given pollutant, the number of pounds of that pollutant

emitted per million British thermal units of heat input (“lb/MMBtu”), measured in

accordance with this paragraph (k).

(x) “Flue Gas Desulfurization System” and “FGD” mean a pollution control device that

employs flue gas desulfurization technology, including an absorber utilizing lime slurry,

for the reduction of SO 2 emissions.

(xi) “Fossil Fuel” means any hydrocarbon fuel, including coal, petroleum coke,

petroleum oil, or natural gas.

(xii) “lb/MMBtu” means one pound of a pollutant per million British thermal units of

heat input.

(xiii) “Make

- Right Vendor Guarantee” means, for an SCR, a guarantee offered by an

SCR vendor that covers the SCR, including the catalyst, ammonia injection system, and

support structure, under operating conditions (excluding any Malfunctions) above

minimum operating temperature for the SCR, the achievement of which is demonstrated

solely during two performance tests: one performance test no later than 90 Days after

initial operation of the SCR, and one performance test after no fewer than 16,000 hours

of SCR operation, but no later than December 31, 2020 regardless of the number of

operating hours achieved. If the SCR does not meet the guarantee in one of these twoPage 16 of 26 performance tests, a Make

- Right Vendor Guarantee requires the SCR vendor to repair,

replace, or correct the SCR to meet the specified guaranteed Emission Rate, which is

demonstrated by successful achievement of a performance test.

(xiv) “Malfunction” means any sudden, infrequent, and not reasonably preventable

failure of air pollution control equipment, process equipment, or a process to operate in

a normal or usual manner. Failures that are caused in part by poor maintenance or

careless operation are not Malfunctions.

(xv) “NOx Allowance” means an authorization or credit to emit a specified amount of

NOx that is allocated or issued under an emissions trading or marketable permit program

of any kind established under the Clean Air Act or an applicable implementation plan.

Although no NOx Allowance program is applicable to FCPP as of the promulgation of

this paragraph (k), this definition of “NOx Allowance” includes authorizations or credits

that may be allocated or issued under emissions trading or marketable permit programs

that may become applicable to FCPP in the future.

(xvi) “Operating Day” means any Day on which a Unit fires Fossil Fuel.

(xvii) “PM” means total filterable particulate matter, measured in accordance with the

provisions of this paragraph (k).

(xviii) “PM CEMS” and “PM Continuous Emission Monitoring System” mean, for

obligations involving the monitoring of PM emissions under this paragraph (k), the

equipment that samples, analyzes, measures, and provides, by readings taken at frequent

intervals, an electronic and/or paper record of PM emissions.

(xix) “Removal Efficiency” means, for a given pollutant, the percentage of that pollutant

removed by the applicable emission control device, measured in accordance with the

provisions of this paragraph (k).

(xx) “Selective Catalytic Reduction” and “SCR” mean a pollution control device that

destroys NOx by injecting a reducing agent (e.g., ammonia) into the flue gas that, in the

presence of a catalyst (e.g., vanadium, titanium, or zeolite), converts NOx into molecular

nitrogen and water.

(xxi) “Semi

- annual reports” are periodic reports that are submitted to EPA within 60

days after the end of each half of the calendar year.

(xxii) “SO 2 Allowance” means an authorization to emit a specified amount of SO 2 that

is allocated or issued under an emissions trading or marketable permit program of any

kind established under the Clean Air Act or an applicable implementation plan,

including as defined at 42 USC 7651a(3).Page 17 of 26 (xxiii) “Surrender” means to permanently surrender SO 2 Allowances so that such SO 2

Allowances can never be used to meet any compliance requirement under the Clean Air

Act or this paragraph (k).

(xxiv) “Unit” means, solely for purposes of this paragraph (k), collectively, the coal

pulverizer, stationary equipment that feeds coal to the boiler, the boiler that produces

steam for the steam turbine, the steam turbine, the generator, equipment necessary to

operate the generator, steam turbine and boiler, and all ancillary equipment, including

pollution control equipment, at or serving a coal

- fired steam electric generating unit at

FCPP.

(xxv) “Wet Stack” means a stack designed to be capable of use with a saturated gas

stream constructed with liner material(s) consisting of one or more of the following:

carbon steel with a protective lining (organic resin, fluoroelastomers, borosilicate glass

blocks or a thin cladding of a corrosion

- resistant alloy), fiberglass

- reinforced plastic,

solid corrosion

- resistant alloy, or acid

- resistant brick and mortar.

(2) NOx Emission Limitations and Control Requirements

(i) The owner or operator shall install and commence Continuous Operation of an SCR

on or FCPP Unit 5 by no later than March 31, 2018. Commencing no later than 30

Operating Days thereafter, the owner or operator shall Continuously Operate the SCR

so as to achieve and maintain a 30

- Day Rolling Average NOx Emission Rate of no

greater than 0.080 lb/MMBtu, subject to the petition process paragraph (k)(2)(iii).

(ii) The owner or operator shall install and commence Continuous Operation of an SCR

on the FCPP Unit 4 by no later than July 31, 2018. Commencing no later than 30

Operating Days thereafter, the owner or operator shall Continuously Operate the SCR

so as to achieve and maintain a 30

- Day Rolling Average NOx Emission Rate of no

greater than 0.080 lb/MMBtu, subject to the petition process in paragraph (k)(2)(iii).

(iii) At any time after March 31, 2019 but before December 31, 2020, the owner or

operator may submit to EPA a petition for a proposed revision to the 30

- Day Rolling

Average NOx Emission Rate of 0.080 lb/MMBtu for either or both of the FCPP Units.

The petition must demonstrate all of the following:

(A) That the design of the SCR system met the following parameters:

(1) The SCR system was designed to meet a NOx emission rate of 0.049

lb/MMBtu, on an hourly average basis, under normal operating conditions once

the minimum operating temperature of the SCR catalyst is achieved; andPage 18 of 26 (2) The owners or operators obtained a Make

- Right Vendor Guarantee for a NOx

emission rate of 0.049 lb/MMBtu;

(B) That best efforts have been taken to achieve the 30

- Day Rolling Average NOx

Emission Rate of 0.080 lb/MMBtu. Best efforts includes but is not limited to

exhausting the Make

- Right Vendor Guarantee and obtaining independent outside

support from a registered professional engineer expert in SCR design. To

demonstrate best efforts have been taken, the petition shall also include:

(1) the request for bid for the subject SCR;

(2) winning bid documents, including all warranties and design information;

(3) NOx, NH 3 , and heat rate CEMS data and all related stack tests;

(4) daily coal quality data, including sulfur, ash, and heat content;

(5) operating and maintenance logs documenting all exceedances of the 0.080

lb/MMBtu 30

- Day Rolling Average NOx Emission Rate and measures taken to

correct them;

(6) vendor certification pursuant to a Make

- Right Vendor Guarantee that the

0.080 lb/MMBtu 30

- Day Rolling Average NOx Emission Rate cannot be met by

the SCR as designed;

(7) a signed and sealed report by a registered professional engineer expert in SCR

design confirming the 0.080 lb/MMBtu 30

- Day Rolling Average NOx Emission

Rate cannot be met by the SCR as designed; and

(8) affidavits documenting causes of failure to meet the 0.080 lb/MMBtu 30Day

Rolling Average NOx Emission Rate, signed and sealed by a licensed

professional engineer;

(C) That the SCR system was properly operated and maintained pursuant to the

manufacturer’s specifications for achieving and Continuously Operating to meet the

design NOx emission rate of 0.049 lb/MMBtu; and

(D) That the owner or operator Continuously Operated the SCR and maximized the

percent of flue gas or water bypassed around the economizer during any startup and

shutdown events in a manner to attain minimum operating temperature as quickly as

reasonably possible during startup and to maintain minimum operating temperature

during shutdowns as long as reasonably possible;Page 19 of 26 (E) That the owner or operator Continuously Operated the SCR and controlled the

percent of flue gas or water bypassed around the economizer to maintain minimum

operating temperature during load changes.

(iv) In any petition submitted pursuant to paragraph (k)(2)(iii), the owner or operator

shall include an alternate 30

- Day Rolling Average NOx Emission Rate, but in no event

may the owner or operators propose a 30

- Day Rolling Average NOx Emission Rate

more than 0.085 lb/MMBtu. The owner or operator shall also submit all studies, reports,

and/or recommendations from the vendor and contractor(s) required by this paragraph

and paragraph (k)(2)(iii), evaluating each measure undertaken in an effort to meet a 30

- Day Rolling Average NOx Emission Rate of no greater than 0.080 lb/MMBtu. The

owner or operator shall also deliver with each submission all pertinent documents and

data that support or were considered in preparing such submission, as well as all data

pertaining to the performance of the SCR in question since August 17, 2015 and the

operational history of the Unit since August 17, 2015.

(v) In addition to meeting the emissions rates set forth in paragraphs (k)(2)(i) and

(k)(2)(ii), all Units at FCPP, collectively, shall not emit NOx in excess of the following

Annual Tonnage Limitation: 31,060 tons of NOx per year in 2016 and 2017; 12,165 tons

of NOx per year in 2018; and 4,968 tons of NOx per year in 2019 and thereafter.

However, if the 30

- Day Rolling Average NOx Emission Rate of 0.080 lb/MMBtu

required under Paragraphs (k)(2)(i) and (k)(2)(ii) is revised pursuant to the petition

process set forth in paragraphs (k)(2)(iii) and (k)(2)(iv), the annual NOx tonnage

limitations set forth as follows shall increase by the ratio of the new NOx rate in

lb/MMBtu determined pursuant to paragraphs (k)(2)(iii) and (k)(2)(iv) divided by 0.080

lb/MMBtu.

(vi) In determining the 30

- Day Rolling Average NOx Emission Rate, the owner or operator

shall use CEMS in accordance with the procedures of 40 CFR part 75, except that NOx

emissions data for the 30

- Day Rolling Average NOx Emission Rate need not be bias

adjusted and the missing data substitution procedures of 40 CFR part 75 shall not apply.

Diluent capping (i.e., 5 percent CO2) will be applied to the NOx emission calculation for

any hours where the measured CO2 concentration is less than 5 percent following the

procedures in 40 CFR part 75, Appendix F, Section 3.3.4.1. The owner or operators shall

report semiannually all hours where diluent capping procedures were applied during the

reporting period.

(vii) For purposes of determining compliance with the Annual Tonnage Limitations in

paragraph (k)(2)(v), the owners or operators shall use CEMS in accordance with the

procedures specified in 40 CFR Part 75.

(viii) The owner or operator shall not sell, trade, or transfer any surplus NOx Allowances

allocated to FCPP that would otherwise be available for sale or trade as a result of the actions

taken by the owner or operators to comply with the requirements of this rule.Page 20 of 26 (3) SO 2 Emission Limitations and Control Requirements

(i) Beginning on August 17, 2015, the owner or operator shall continuously operate the

existing FGDs at FCPP Unit 4 and Unit 5 so as to emit SO 2 from FCPP at an amount no

greater than 10.0% of the potential combustion concentration assuming all of the sulfur in

the coal is converted to SO 2 . Compliance with this emissions standard shall be determined

on a rolling 365

- Operating Day basis using the applicable methodologies set forth in

paragraph (e)(2). The first day for determining compliance with this emissions standard shall

be 365 Days after August 17, 2015. The requirements of this paragraph shall remain in effect

until the owner or operators achieve compliance with the requirements set forth in

paragraphs (k)(3)(ii) and (k)(3)(iii).

(ii) By no later than March 31, 2018, the owner or operators shall convert the existing

ductwork and stack at FCPP Unit 5 to a Wet Stack, so as to eliminate the need to bypass

flue gas around the FGD absorbers for reheat purposes. Commencing no later than 30

Operating Days thereafter, the owner or operators shall continuously operate the existing

FGD at FCPP Unit 5 so as to achieve and maintain a 30

- Day Rolling Average SO 2 Removal

Efficiency of at least 95.0%.

(iii) By no later than July 31, 2018, the owner or operators shall convert the existing

ductwork and stack at FCPP Unit 4 to a Wet Stack, so as to eliminate the need to bypass

flue gas around the FGD absorbers for reheat purposes. Commencing no later than 30

Operating Days thereafter, the owner or operators shall Continuously Operate the existing

FGD at FCPP Unit 4 so as to achieve and maintain a 30

- Day Rolling Average SO 2 Removal

Efficiency of at least 95.0%.

(iv) In addition to meeting the emissions rates set forth in paragraphs (k)(3)(i), (k)(3)(ii) and

(k)(3)(iii), all Units at FCPP, collectively, shall not emit SO 2 in excess of the following

Annual Tonnage Limitations: 13,300 tons of SO 2 per year in 2016 and 2017; 8,300 tons of

SO 2 per year in 2018; 6,800 tons of SO 2 per year in 2019 and thereafter.

(v) By each of the dates by which the owner or operator must comply with the 30

- Day

Rolling Average SO 2 Removal Efficiency required under paragraphs (k)(3)(ii) and

(k)(3)(iii), The owners or operators shall install, certify, maintain, and operate FGD inlet

SO 2 and any associated diluent CEMS with respect to that Unit in accordance with the

requirements of paragraph (e)(1).

(vi) In determining the 30

- Day Rolling Average SO 2 Removal Efficiency, the owner or

operator shall use CEMS in accordance with the procedures of 40 CFR part 75, except that

SO 2 emissions data for the 30

- Day Rolling Average SO 2 Removal Efficiency need not be

bias adjusted and the missing data substitution procedures of 40 CFR part 75 shall not apply.

Diluent capping (i.e., 5 percent CO2) will be applied to the SO 2 emission calculation for any

hours where the measured CO2 concentration is less than 5 percent following the procedures

in 40 CFR part 75, Appendix F, Section 3.3.4.1. The owners or operators shall submit aP a g e 21 o f 13

Page 21 of 26 semi

- annual report that includes all hours where diluent capping procedures were applied

during the reporting period.

(vii) For purposes of determining compliance with the Annual Tonnage Limitations in Table

2, The owners or operators shall use CEMS in accordance with the procedures specified in

40 CFR part 75.

(4) Use and Surrender of SO 2 Allowances

(i) The owner or operator shall not use SO 2 Allowances to comply with any requirement of

paragraph (k), including by claiming compliance with any emission limitation required

by paragraph (k) by using, tendering, or otherwise applying SO 2 Allowances to offset

any excess emissions.

(ii) Except as provided in paragraph (k), the owner or operator shall not sell, bank, trade, or

transfer any SO 2 Allowances allocated to FCPP.

(iii) Beginning with calendar year 2015, and continuing each calendar year thereafter, the

owner or operator shall surrender to EPA, or transfer to a non

- profit third party selected by

the owners or operators for Surrender, all SO 2 Allowances allocated to FCPP for that

calendar year that the owner or operator does not need in order to meet their own federal

and/or state Clean Air Act statutory or regulatory requirements for the FCPP Units.

(iv) Nothing in paragraph (k)(4) shall prevent the owners or operators from purchasing or

otherwise obtaining SO 2 Allowances from another source for purposes of complying with

Clean Air Act requirements to the extent otherwise allowed by law.

(v) For any given calendar year, provided that FCPP is in compliance for t hat calendar year

with all emissions limitations for SO 2 set forth in this section, nothing in paragraph (k),

including the provisions of paragraphs (k)(4)(ii) and (k)(4)(iii) pertaining to the Use and

Surrender of SO 2 Allowances, shall preclude the owner or operator from selling, trading, or

transferring SO 2 Allowances allocated to FCPP that become available for sale or trade that

calendar year solely as a result of:

(1) The installation and operation of any pollution control technology or technique at

Unit 4 or Unit 5 that is not otherwise required by paragraph (k); or

(2) Achievement and maintenance of a 30

- Day Rolling Average SO 2 Removal

Efficiency at Unit 4 or Unit 5 at a higher removal efficiency than the 30

- Day Rolling

Average SO 2 Removal Efficiency required by paragraph (k)(3); so long as the owner or

operator submits a semi

- annual report of the generation of such surplus SO 2 Allowances

that occur after August 17, 2015.P a g e 22 o f 13

Page 22 of 26 (vii) The owner or operator shall surrender, or transfer to a non

- profit third party selected

by the owners or operators for surrender, all SO 2 Allowances required to be surrendered

pursuant to paragraph (k)(4)(iii) by April 30 of the immediately following calendar year.

Surrender need not include the specific SO 2 Allowances that were allocated to FCPP, so

long as the owners or operators surrender SO 2 Allowances that are from the same year and

that are equal to the number required to be surrendered under paragraph (k)(4)(vii).

(viii) If any SO 2 Allowances are transferred directly to a non

- profit third party, the owner or

operator shall include a description of such transfer in the next semi

- annual report submitted

to EPA. Such report shall:

(1) provide the identity of the non

- profit third

- party recipient(s) of the SO 2 Allowances

and a listing of the serial numbers of the transferred SO 2 Allowances; and

(2) include a certification by the third

- party recipient(s) certifying under the penalty of

law that the recipient(s) will not sell, trade, or otherwise exchange any of the allowances

and will not use any of the SO 2 Allowances to meet any obligation imposed by any

environmental law. The certification must also include a statement that the recipient

understands that there are significant penalties for submitting false, inaccurate or

incomplete information to the United States.

(3) No later than the third semi

- annual report due after the transfer of any SO 2

Allowances, The owner or operator shall include a statement that the third

- party

recipient(s) Surrendered the SO 2 Allowances for permanent surrender to EPA in

accordance with the provisions of paragraph (k)(4)(ix) within one (1) year after the

owners or operators transferred the SO 2 Allowances to them. The owner or operator

shall not have complied with the SO 2 Allowance Surrender requirements of

subparagraph (k)(4)(viii) until all third

- party recipient(s) shall have actually Surrendered

the transferred SO 2 Allowances to EPA.

(ix) For all SO 2 Allowances surrendered to EPA, the owner or operator or the third

- party

recipient(s) (as the case may be) shall first submit an SO 2 Allowance transfer request form

to the EPA Office of Air and Radiation’s Clean Air Markets Division directing the transfer

of such SO 2 Allowances to the EPA Enforcement Surrender Account or to any other EPA

account that EPA may direct in writing. Such SO 2 Allowance transfer requests may be made

in an electronic manner using the EPA’s Clean Air Markets Division Business System or

similar system provided by EPA. As part of submitting these transfer requests, the owners

or operators or the third

- party recipient(s) shall irrevocably authorize the transfer of these

SO 2 Allowances and identify

-- by name of account and any applicable serial or other

identification numbers or station names

-- the source and location of the SO 2 Allowances

being surrendered.

(5) PM Emission Reduction RequirementsP a g e 23 o f 13

Page 23 of 26 (i) The owner or operator shall operate each FCPP Unit in a manner consistent with good

air pollution control practice for minimizing PM emissions, as set forth in paragraph (g). In

addition, with respect to FCPP Units 4 and 5, the owners or operators shall, at a minimum,

to the extent practicable:

(1) operate each compartment of the Baghouse for each Unit (except the compartment

provided as a spare compartment under the design of the baghouse), regardless of

whether those actions are needed to comply with opacity limits;

(2) repair any failed Baghouse compartment at the next planned Unit outage (or

unplanned outage of sufficient length);

(3) maintain and replace bags on each Baghouse as needed to achieve the required

collection efficiency;

(4) inspect for and repair during the next planned Unit outage (or unplanned outage of

sufficient length) any openings in Baghouse casings, ductwork, and expansion joints to

minimize air leakage; and

(5) ensure that a bag leak detection program is developed and implemented to detect

leaks and promptly repair any identified leaks.

(ii) The owner or operator shall Continuously Operate a Baghouse at FCPP Unit 4 and Unit

5 so as to achieve and maintain a filterable PM Emission Rate no greater than 0.0150

lb/MMBtu.

(iii) Once in each calendar year, the owner or operator shall conduct stack tests for PM at

FCPP Units 4 and 5. Alternatively, following the installation and operation of PM CEMS

as required by paragraph (k)(6) of this paragraph (k), The owners or operators may seek

written approval to forego stack testing and instead demonstrate continuous compliance

with an applicable filterable PM Emission Rate using CEMS on a 24

- hour rolling average

basis.

(iv) Unless EPA approves a request to demonstrate continuous compliance using CEMS

under paragraph (k)(5)(iii) to determine compliance with the PM Emission Rate established

in subparagraph (k)(5)(ii), the owners or operators shall use the reference methods and

procedures (filterable portion only) specified in 40 CFR part 60, App. A

- 3, Method 5,

Method 5 as described in subpart UUUUU, Table 5, or App. A

- 6, Method 17 (provided that

Method 17 shall only be used for stack tests conducted prior to conversion of an FCPP Unit

to a Wet Stack), or alternative stack tests or methods that are requested by The owners or

operators and approved by EPA. Each test shall consist of three separate runs performed

under representative operating conditions not including periods of startup, shutdown, or

Malfunction. The sampling time for each run shall be at least 120 minutes and the volumeP a g e 24 o f 13

Page 24 of 26 of each run shall be at least 1.70 dry standard cubic meters (60 dry standard cubic feet). The

owners or operators shall calculate the PM Emission Rate from the stack test results in

accordance with 40 CFR 60.8(f). The results of each PM stack test shall be submitted to

EPA and NNEPA within 60 Days of completion of each test.

(v) Once each calendar year, the owner or operator shall conduct a PM stack test for

condensable particulate matter PM at FCPP Units 4 and 5, using the reference

methods and procedures set forth at 40 C.F.R. Part 51, Appendix M, Method 202 and as

set forth in paragraph (iv). This test shall be conducted under as similar operating

conditions and as close in time as reasonably possible as the test for filterable PM in

paragraph (k)(5)(iv). Each test shall consist of three separate runs performed under

representative operating conditions not including periods of startup, shutdown, or

Malfunction. The sampling time for each run shall be at least 120 minutes and the volume

of each run shall be at least 1.70 dry standard cubic meters (60 dry standard cubic feet).

The owner or operator shall calculate the number of pounds of condensable PM

particulate matter emitted in lb/MMBtu of heat input from the stack test results in

accordance with 40 CFR 60.8(f). The results of the condensable particulate matter PM stack

test conducted pursuant to this paragraph shall not be used for the purpose of determining

compliance with the PM Emission Rates required by paragraph (k). The results of each

PM condensable particulate matter stack test shall be submitted to EPA within sixty

(60) Days of completion of each test. If EPA approves a request to demonstrate

continuous compliance with an applicable PM Emission Rate at a Unit using PM CEMS

under paragraph (k)(5)(iii), annual stack testing for condensable particulate matter PM

using the reference methods and procedures set forth at 40 CFR part 51, Appendix M,

Method 202 is not required for that Unit.

(6) PM CEMS

(i) The owner or operator shall install, correlate, maintain, and operate a PM CEMS for

FCPP Unit 4 and FCPP Unit 5 as specified below. The PM CEMS shall comprise a

continuous particle mass monitor measuring particulate matter concentration, directly or

indirectly, on an hourly average basis and a diluent monitor used to convert the

concentration to units expressed in lb/MMBtu. The PM CEMS installed at each Unit must

be appropriate for the anticipated stack conditions and capable of measuring PM

concentrations on an hourly average basis. Each PM CEMS shall complete a minimum of

one cycle of operations (sampling, analyzing and data recording) for each successive 15

-

minute period. The owners or operators shall maintain, in an electronic database, the hourly

average emission values of all PM CEMS in lb/MMBtu. Except for periods of monitor

malfunction, maintenance, or repair, the owner or operator shall continuously operate the

PM CEMS at all times when the Unit it serves is operating.

(ii) By no later than February 16, 2017, the owner or operator shall ensure that the PM

CEMS are installed, correlated, maintained and operated at FCPP Units 4 and 5.

(iii) The owner or operator shall ensure that performance specification tests on the PM

CEMS are conducted, and shall ensure compliance with the PM CEMS installation plan andP a g e 25 o f 13

Page 25 of 26 QA/QC protocol submitted to and approved by EPA. The PM CEMS shall be operated in

accordance with the approved plan and QA/QC protocol.

(iv) The data recorded by the PM CEMS during Unit operation, expressed in lb/MMBtu on

a 3

- hour, 24

- hour, and 30

- Day rolling average basis, shall be included in the semiannual

report submitted to EPA in electronic format (Microsoft Excel

- compatible).

(v) Notwithstanding any other provision of paragraph (k), exceedances of the PM Emission

Rate that occur as a result of detuning emission controls as required to achieve the high level

PM test runs during the correlation testing shall not be considered a violation of the

requirements of this section; provided, however, that the owners or operators shall make

best efforts to keep the high level PM test runs during such correlation testing below the

applicable PM Emission Rate.

(vi) Stack testing conducted pursuant to paragraph (k)(5)(iv) shall be the compliance method

for the PM Emission Rates established by paragraph (k)(5), unless EPA approves a request

under paragraph (k)(5)(iii), in which case PM CEMS shall be used to demonstrate

continuous compliance with an applicable PM Emission Rate on a 24

- hour rolling average

basis. Data from PM CEMS shall be used, at a minimum, to mo nitor progress in reducing

PM emissions on a continuous basis.

(7) Reporting. The owner or operator shall submit all notifications, petitions, and reports under

paragraph (k), unless otherwise specified, to EPA and Navajo Nation EPA in accordance with

paragraph (f). Prohibition on Netting Credits or Offsets. Emission reductions that result from

the actions taken by the owner or operator after August 17, 2015, to comply with the

requirements of paragraph (k) shall not be considered as a creditable contemporaneous

emission decrease for the purpose of obtaining netting credit or offset under the Clean Air

Act ’ s Nonattainment NSR and PSD programs.

(i ) The limitations on the generation and use of netting credits or offsets set forth in

paragraph (k)(7) do not apply to emission reductions achieved by FCPP Units that are

greater than those required under paragraph (k). For purposes of paragraph (k)(7)(i)

, emission reductions from an FCPP unit are greater than those required under paragraph

(k) if, for exam ple, they result from the owner or operator’s compliance with federally

enforceable emission limits that are more stringent than those limits imposed on

individual FCPP Units under paragraph (k) and under applicable provisions of the Act.

(ii) Nothing in paragraph (k) is intended to preclude the emission reductions generated

under paragraph (k) from being considered by the NNEPA or EPA as creditable

contemporaneous emission decreases for the purposes of attainment demonstrations

submitted pursuant to Secti on 110 of the Act, 42 U.S.C. 7410, or in determining impacts

on National Ambient Air Quality Standards, PSD increment, or air quality related values,

including visibility in a Class I area.