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ExxonMobii Production Compal,

P.O. Box 4358

Houston; Texas 77210-4358

May 27, 2004

Gerardo C. Rios

Chief, Permits Office

United States Environmental Protection Agency

Region IX

75 Hawthorne Street

San Francisco, CA 94105

RECEiVED

JUN 3 2004

'. ~"l' -c c, 6 'Ir-'~ PermllS UI HJV ,\

U.S. EPA,"

E'f<onMobii

Production

Subject: Response to Request for Information to Update Part 71 Permit Application No. NN-OP 00-07

Dear Mr. Rios:

ExxonMobil submits this letter in response to Region IX's letter dated March 31,2004. In order to

respond to the request it is important to review a brief history of ExxonMobil's McElmo Creek Unit

(MCU) site. The original PSD permit included several pieces of equipment as listed in your Attachment

A; however, during the middle of the 1990s the NGL facilities were shut down due to economic reasons.

With the shut down of the NGL process, all gas driven compressors and turbines within the plant were

converted to electric, sulfur recovery was ceased and gas dehydration was reduced. Today ExxonMobil's

MCU site contains only the following air emitting sources: emergency/process flare, gasoline tank, TEG

reboiler, Glycol heater. The line heater (also know as C02 heater) was removed on March 8, 2004.

Below are ExxonMobil's responses to each of the items addressed in Region IX's letter:

1. The gas turbine, T4500 was removed June 1998; therefore, 40 CPR part 60 Subpart GG is not

applicable.

2. The McElmo facility no longer processes natural gas liquids. This process was discontinued and

dismantled in June 1998. Therefore 40 CPR Part 60 Subpart KKK is no longer applicable.

3. The McElmo facility is not classified as a natural gas processing facility. In addition, the plant does

not sweeten or recover sulfur. This declassification and removal of sulfur recovery equipment

occurred in June 1998. Therefore 40 CPR Part 60 Subpart LLL is no longer applicable.

4. Currently only one TEG reboiler is in operation at the McElmo Creek Unit. The emissions from the

still vent are routed to the flare to control and reduce emissions. Subpart HH MACT standard does

not apply because emissions are low enough that they do not trigger the regulation. Attached are

current emissions as calculated by GRI-GLYCalc. In addition, last years emission inventory is

included for your reference.

5. As describe above, all equipment except one TEG reboiler has been removed from ExxonMobil's

MCU site. The removal of the equipment was completed in June 1998. Attached for your reference

A Division of Exxon Mobil Corporation
is a copy of our historic APE documentation that lists the project year, the project description and

gives a break down ofthe cost.

6. Benzene is present at the MCU site, however no stream contains or contacts benzene greater than 10

percent by weight. In 2001 liquid and gas samples were taken and analyzed. Benzene was present in

the plant closed drain system and in the inlet gas stream. On a volume percent basis, the liquids in the

closed drain system contained 0.3839 percent benzene while the inlet gas sample contained 0.0279

percent. For a more recent inlet gas analysis please see the attached GRI-GLYCalc calculation.

Currently, ExxonMobil is in negotiations with the Department ofJustice and the EPA for a consent

decree at the MCU site. It is important to note that the Consent Decree has several stipulations that must

be carried over into the Title V and PSD permit. These include permit limits, monitoring, operation and

maintenance plans and semi annual reporting. Also, as part ofthe PSD permit, ExxonMobil must conduct

a BACT analysis and air quality analysis. ExxonMobil would like to discuss these terms and conditions

with the Permit Office. Jennifer Wilder Baird will contact Shaheerah Fateen within the next several

weeks to discuss further.

If you have any further questions, please contact Jennifer Wilder Baird by phone at (281) 654-1135 or via

e-mail atjennifer.wilder@exxonmobil.com.

y~~

N~ JRyan't7. 'if..-

Regulatory Compliance Supervisor

ExxonMobil Production Company

Attachments

CERTIFIED MAIL

RETURN RECEIPT REQUESTED

CC: Shaheerah Fateen, EPA Region IX

75 Hawthorne Street

San Francisco, CA 94105
Emissions from TEG System

GRIGLYCalc

!~. Rt:CI::IVED

JUN -,_. 3 2004

Permits Office Air-3

U.S. EPA, Region 9
GRI-GLYCalc VERSION 4.0 - SUMMARY OF INPUT VALUES

Case Name: McElmo

File Name: H:\Griglyca.4\mcelmo.ddf

Date: May 21, 2004

DESCRIPTION:

Description:

Page: 1

Annual Hours of Operation:

WET GAS:

8760.0 hours/yr

Temperature: 101.00 deg. F

Pressure: 360.00 psig

Wet Gas Water Content: Saturated

DRY GAS:

LEAN GLYCOL:

PUMP:

Component

Carbon Dioxide

Nitrogen

Methane

Ethane

Propane

Isobutane

n-Butane

Isopentane

n-Pentane

Other Hexanes

Heptanes

Benzene

Toluene

Ethylbenzene

Xylenes

C8+ Heavies

Flow Rate:

Water Content:

Glycol Type: TEG

Water Content:

Recirculation Ratio:

Conc.

(vol %)

69.6350

1. 4140

15.7570

5.5940

4.1860

0.5760

1. 6670

0.4280

0.5400

0.1520

0.0410

0.1630

0.0270

0.0030

0.0120

0.0030

11 . 0 MMSCF / day

7.0 lbs. H20/MMSCF

1. 5 wt% H20

4.2 galllb H20

Glycol Pump Type: Electric/Pneumatic
Page: 2

FLASH TANK:

Flash Control: Recycle/recompression

Temperature: 70.0 deg. F

Pressure: 75.0 psig

REGENERATOR OVERHEADS CONTROL DEVICE:

Control Device:

Destruction Efficiency:

Excess Oxygen:

Ambient Air Temperature:

Combustion Device

98.0 %

0.0 %

0.0 deg. F
GRI-GLYCalc VERSION 4.0 - EMISSIONS SUMMARY

Case Name: McElmo

File Name: H:\Griglyca.4\mcelmo.ddf

Date: May 21, 2004

CONTROLLED REGENERATOR EMISSIONS

Page: 1

-------------------------------------------------------------------

Component lbs/hr lbs/day tons/yr ------------------------------- ----------- ----------- -----------

Methane 0.0005 0.012 0.0022

Ethane 0.0043 0.102 0.0186

Propane 0.0200 0.481 0.0878

Isobutane 0.0075 0.180 0.0328

n-Butane 0.0351 0.843 0.1539

Isopentane 0.0137 0.329 0.0600

n-Pentane 0.0238 0.572 0.1044

Other Hexanes 0.0118 0.284 0.0519

Heptanes 0.0118 0.282 0.0515

Benzene 0.6079 14.591 2.6628

Toluene 0.1705 4.093 0.7469

Ethylbenzene 0.0301 0.723 0.1320

Xylenes 0.1526 3.661 0.6682

C8+ Heavies 0.0088 0.210 0.0384

-------~---------------------------------- ----------- -----------

Total Emissions 1.0985 26.364 4.8114

Total Hydrocarbon Emissions 1. 0985 26.364 4.8114

Total VOC Emissions 1. 0938 26.250 4.7907

Total HAP Emissions 0.9612 23.068 4.2099

Total BTEX Emissions 0.9612 23.068 4.2099

UNCONTROLLED REGENERATOR EMISSIONS -------------------------------------------------------------------

Component lbs/hr lbs/day tons/yr

------------------------------- ----------- ----------- -----------

Methane 0.0245 0.589 0.1075

Ethane 0.2126 5.103 0.9313

Propane 1. 0025 24.059 4.3907

Isobutane 0.3749 8.999 1. 6422

n-Butane 1.7569 42.165 7.6950

Isopentane 0.6851 16.443 3.0009

n-Pentane 1.1920 28.608 5.2210

Other Hexanes 0.5919 14.206 2.5925

Heptanes 0.5882 14.116 2.5761

Benzene 30.3973 729.536 133.1403

Toluene 8.5268 204.643 37.3474

Ethylbenzene 1.5065 36.156 6.5986

Xylenes 7.6278 183.067 33.4098

C8+ Heavies 0.4380 10.513 1. 9187

------------------------------- ----------- ----------- -----------

Total Emissions 54.9251 1318.203 240.5720

Total Hydrocarbon Emissions 54.9251 1318.203 240.5720

Total VOC Emissions 54.6880 1312.511 239.5332

Total HAP Emissions 48.0585 1153.403 210.4960

Total BTEX Emissions 48.0585 1153.403 210.4960

FLASH GAS EMISSIONS
Note: Flash Gas Emissions are zero with the

Recycle/recompression control option.

FLASH TANK OFF GAS

Page: 2

-------------------------------------------------------------------

Component lbs/hr lbs/day tons/yr ------------------------------- ----------- ----------- -----------

Methane 0.5763 13.831 2.5241

Ethane 1.1540 27.697 5.0546

Propane 2.0205 48.492 8.8497

Isobutane 0.4338 10.411 1.8999

n-Butane 1. 4101 33.842 6.1762

Isopentane 0.4318 10.362 1.8911

n-Pentane 0.5759 13.822 2.5226

Other Hexanes 0.1886 4.528 0.8263

Heptanes 0.0560 1.345 0.2454

Benzene 0.1855 4.452 0.8125

Toluene 0.0284 0.683 0.1246

Ethylbenzene 0.0025 0.061 0.0111

Xylenes 0.0083 0.200 0.0366

C8+ Heavies 0.0069 0.166 0.0303 ------------------------------- ----------- ----------- -----------

Total Emissions 7.0788 169.891 31.0050

Total Hydrocarbon Emissions 7.0788 169.891 31.0050

Total VOC Emissions 5.3485 128.363 23.4263

Total HAP Emissions 0.2248 5.396 0.9848

Total BTEX Emissions 0.2248 5.396 0.9848
TEG Dehydration Flowsheet

Dr~

Gas

Lean

GI~ool

Electric

Pump

Flash Gas

Emissions

Flash Gas

Control

Overheads

Flash

Tank.

Flash

GI~ool GI~ool

Makeup

Regenerator Flash

Gas

Heat

L- Ellchanger ---'

Rioh

GI~ool
Emission Inventory Fees from 2003
,

,~, ~\ OMB Control No 2060-0336

u.s. ENVIRONMENTAL PROTECTION AGENCY

APPLICATION FOR FEDERAL OPERATING PERMIT, 40 CPR PART 71

FORM FEE - FEE CALCULAnON WORKSHEET

INSTRUCTIONS: Use this form to initially or thereafter on a annual basis report actual emissions and calculate fees, consistent with

§ 71.9.

A. General Information

Instructions: All sources must complete this section.

Type of fee calculation worksheet (Check one):

_ Initial .1L Annual

Deadline for submitting fee calculation worksheet 03 / 22 / 2004

For initial fee calculation worksheets, emissions are based on (Check one):

.1L Actual emissions for the preceding year

_ Estimates of actual emissions for the preceding year

_ Estimates of actual emissions for the current year

If you checked the last box, provide the date the facility commenced operations / / _

B. Source Information

Instructions: Complete this section only if you are not applying for a permit at this time.

Source or facility name Mc Elmo Plant

Mailing address: Street or P.O. Box :.P.:.. . ..::0.:.. . ..::B"'o"'x....:G"- _

City -=="'- Cortez _ State ZIP_-"-'c:=-=---- 81321 __

Arlene Lee Senior Field Superintendent

Telephone C21!U 564 - 5210 Ext. _ Part 71 permit no. .:....::..:..... NA _

C. Certification of Truth, Accuracy and Completeness

Instructions: This form must be signed by the responsible official.

Date: 02/ 2C1/ Samuel J. Silverio b c./

I certify under penalty of law thzt, based n information and belief formed after reasonable inquiry, the statements and information contained in this fee

calculation worksheet(/ a/1hmen t'":r:rn':'~o~~'

Name (signed) _",XI~hl-Jt!-.L/~-.l.t.M~~~~:::::::~~~-.::::!.----- I

Name (typed) __--"'=:='-'-"'=-==__

1:\.....Compliance\RNoordin\Four Corners\epa emission feef calc worksheet MCELMO 1001 02.wpd
Form FEE Continued 2

D. Annual Emissions Report for Fee Calculation Purposes -- Non-HAP

Instructions: Report calendar-year actual emissions of regulated pollutants (for fee calculation) except for HAP, and use for both initial and annual

fee calculation purposes. Section E is used to report actual emissions of HAP. Quantify all actual emissions, including fugitives, but do not include

insignificant emissions. Round to the nearest tenth of a ton. Sum the emissions in each column and enter a subtotal at the bottom of the page. If a

subtotal is greater than 4,000 tons, enter 4,000. Submit attachments showing calculations.

This data is for 2003 (year).

Emissions Unit ID Actual Emissions (TonslYear)

NOx VOC S02 PMIO Lead Other

Flare 13.97 108.6 62.4 --- ---

--- -- --- --- --- Line Heater

Fugitives --- 13.4 --- --- ---

Gasoline Tank --- I.7 --- --- ---

TEG Reboiler --- --- --- --- ---

4.6 0.3 0.0 --- --- Glycol Heater

SUBTOTALS 124.0 62.4

NOTE: The Line Heater was shut-in year 2003. Emissions from the TEG Reboiler still vent is routed to the flare.

I:\.....Compliance\RNoordin\Four Comers\epa emission feef calc worksheet MCELMO 10 01 02.wpd
Form FEE Continued

E. Annual Emissions Report for Fee Calculation Purposes •• HAP

3

Instructions: Use the first table below to identify each HAP meeting the definition of regulated pollutant (for fee calculation) emitted at the facility,

identify the CAS number, and assign a unique identifier for use in the second table in this section. When assigning identifier codes, please use

"HAP1" for the first, "HAn" for the second, and so on.

Name of HAP CAS No. Identifier

Benzene 71-43-2 HAP!!

Toluene 108-88-3 HAP I

Ethyl-benzene 100-41-4 HAP§.

Xylene 1330-20-7 HAPK

N-Hexane 110-54-3 HAP!:!

HAP --

HAP --

HAP --

Instructions: Now report the actual emissions of each individual HAP identified above. Use the identifiers assigned in the table above to identify

each HAP. Include all emissions, including fugitives, but do not include insignificant emissions. Report emissions values to the nearest tenth of a

ton. Sum the emissions in each column and show a subtotal at the bottom of the page. If a subtotal is greater than 4,000 tons, enter 4,000. Submit

attachments showing calculations.

This data is for 2003 (year)

Emissions Unit ID Actual Emissions (TonslYear)

HAP..!!.. HAP.I. HAP.§... HAP-K. HAPK HAP_ HAP_ HAP__

Flare

Line Heater

Fugitives

Gasoline

TEG Reboiler

Glycol Heater

SUBTOTALS Q Q Q Q Q

I:\.....Compliance\RNoordin\Four Corners\epa emission feef calc worksheet MCELMO 10 01 02.wpd
AFE Documentation
Page: 1 Document Name: untitled

CBCR06-2 AFE VI ElY SCREEN ID f:I APE 11 EAXN

3

ITI

JI APP DATE 061598

LOCATION

CTL 3F210

FUNCTION 031

SUB LOCATION 00

ADDITIONAL SOB

STATB UT

OPERATOR MOBIL

AFE CODE XX TOTAL DEPTH

OVERHEAD N OVERHEAD \

ESTIMATED COMPLETION YY QTR 98

MASTER TYPE

PROBABLE RESERVES

PF08 - PAGE FORTtfARD

REVIErmD BY CAPITAL BUDGET

4

16073

LOCATION

USER NM~E KYLE B_ CARNAHAN PHONE ij 333-5210

COMPANY MEPUS DIVISION LO

DEPARTI1ENT S DATE SUmlITTED 051498 BUDGET CATEGORY 2.9 SUBCODE:

Al!B DESCRIPTION l-ICEIJoI0 CREEK PLANT DISMANTLEr<lENT PROJECT (PROCESS)

PROJECT NO 95618 BUDGET YEAR 1.998

AFE YEAR 1998 ENGINEERING PROJECT NO.

LEGAL DESCRIPTION

COUNTY SAN JUAN

Ot~RSHIP .51407380

C.

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CURRENT

AFE 1+ EAXN

PRIOR TOTAL

PROJECT TOTAL - GROSS

NON MOBIL SHARE

CATEGORY TITLE

ACCOONT

TRANSFERRED FIXED ASSETS

NON-BUDGET

M~ FOR NOTATION-MOBIL

(- B"INANCIAL LEASES

',I & A

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ID# APE # EAXN

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ORIGINAL 598

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SUPPLEMENT 2

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C rOrAL

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110

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DCF RATE OF RETN

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PAYOUT PERIOD YRS

NET CASH RECM$

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OTHER FINANCIAL INDICATORS

ALTERNATE USER 10

PF03-MENU SCREEN PF07-PAGE EACKWARD PF08-PAGB FORWARD

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PROJECT DESIGNED TO DIS~~LE AND RBMOVE PROCESS PIPING AND EQ~PMENT THAT

rms BEEN TAKEN OUT OF SERVICE AT THE l>ICELMO CREEK GAS PLANT. PIPING AND IS

OLATION VALVES WILL BE BLINDED TO REDUCE FUTURE SAFETY CONCERNS.

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PROJECT DESCRIPTION AND JUSTIFICATION

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