## (0 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 Informationto Update Part 71 PermitApplication No. NN-OP 00-07 Dear Mr. 

### Rios: ExxonMobil submits this letterin response to Region IX's letter dated March 31,2004. In orderto respond to the request it is important to review a briefhistory ofExxonMobil's McElmo CreekUnit (MCU) site. The original PSD permitincluded several pieces ofequipment 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 longerprocesses 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 Therefore 40 CPR Part 60 Subpart KKK is no longer applicable. 3.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 anatural gas processing facility. In addition, the plant does not sweeten or recover sulfur. This declassification and removal ofsulfurrecovery equipment occurred in June 1998. Therefore 40 CPR Part 60 SubpartLLL is no longer applicable. 4. Currently only one TEGreboileris in operation at the McElmo CreekUnit. The emissions from the still vent are routed to the flare to control and reduce emissions. SubpartHH MACT standard does not apply because emissions are low enough that they do not trigger the regulation. Attached are current emissions as calculatedby GRI-GLYCalc. In addition, last years emission inventory is included for your reference. 5. As describe above, all equipment except one TEGreboilerhas been removed from ExxonMobil's MCU site. The removal ofthe equipment was completed in June 1998. Attached for your reference

A Division of Exxon Mobil Corporation

### is a copy ofour historic APE documentationthat lists the projectyear, the project description and gives a break down ofthe cost. 6. Benzene is present at the MCU site, howeverno stream contains or contacts benzene greater than 10 percentby weight. In 

### 2001 liquid and gas samples were taken and analyzed. Benzene was presentin the plant closed drain system and in the inlet gas stream. On a volume percentbasis, the liquids in the closed drain system contained 0.3839 percentbenzene 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 importantto note that the ConsentDecree has several stipulations that must be carried over into the Title V and PSD permit. These include permitlimits, 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. JenniferWilderBaird will contact ShaheerahFateen withinthe next several weeks to discuss further. Ifyou have any further questions, please contactJenniferWilderBairdby phone at (281) 654-1135 or via e-mail atjennifer.wilder@exxonmobil.com.

# y~~

# N~ J

### Ryan'

# t7. 

# 'if..- Regulatory Compliance Supervisor ExxonMobil Production Company

Attachments CERTIFIED MAIL RETURN RECEIPT REQUESTED CC: Shaheerah Fateen, EPARegion 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. FGRI-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 EMISSIONSNote: 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 Ellchanger L- ---' 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 CALCULAnONWORKSHEET
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"-

_ 81321 State ZIP_-"-'c:=-=----

__ Cortez City 

### -=="'-

_ Arlene Lee Senior Field Superintendent NA Part 71 permit no. .:....::..:.....

_ Ext. _ Telephone 

### C21!U 564 - 5210
C. Certification ofTruth, Accuracy and Completeness Instructions: This form must be signed by the responsible official.

Date: 02/ 2C 1/ b 

# c./ Samuel J. Silverio I certify under penalty of law thzt, based n information and beliefformed afterreasonable 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 feefcalc 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. Ifa 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 feefcalc 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 identifierfor 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. Ifa 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\FourCorners\epa emission feefcalc worksheet MCELMO 10 01 02.wpd

# AFE DocumentationPage: 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.- 'JO 

### TtlELLS

. JJI 

### REF PASB CLASS INTEREST LOCATION ADDITIONAL RBI-lARKS 

### MASTER AFE PROVED RESERVES PF03-MENU 

### SCREEN

THIS AFE HAS BEEN 'I ::> ::>



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- GROSS NON MOBIL SHARE CATEGORY TITLE 

### ACCOONT TRANSFERRED FIXED ASSETS NON-BUDGET**M~** 

### FOR NOTATION-MOBIL (- B"INANCIAL LEASES ',I & A 

### OTHER
- DESC OTHER
- AMT MEMO NORKING CAPITAL 

### TOTAL MOBIL COST INTEREST CAPITALIZBD 110 53

57 57

57 110 53

57 57

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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. It') => => §I


# ( CBCR06-6 AFE VIE\'1 SCREEN ID IJ AFE if EAX.N PROJECT DESCRIPTION AND JUSTIFICATION



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