... -.- ....
 

HOLLY~
 REFINING & MARKETING COMPANY - WOODS CROSS 

393 South 800 West. Woods Cross, Utah 84087-1435 

(801) 299·6600 • Fax (801) 299-6609 

---ApriJ..J,Q,.2006 

Mr. Richard Sprott, Director CERTIFIED MAIL: 7002 3150 000362809596 

Division ofAir Quality 

Utah Dept. ofEnvironmental Quality 

150 North 1950 West 

Salt Lake City, Utah 84114 

Mr. Neil Taylor CERTIFIED MAIL: 70023150000362809602 

Diy. of Environmental Response & Remediation, SERC 

Utah Department ofEnvironmental Quality 

PO Box 144840, 168 North 1950 West 

Salt Lake City, ur 84114 

Mr. Brian Law CERTIFIED MAIL: 70023150000362809619 

Davis County Sheriff's Department 

Davis County LEPC 

800 W. State Street 

Farmington, UT 84025 

RE:	 Reportable Event April 9, 2006
 

Unavoidable Breakdowns
 

To Whom It May Concern: 

In accordance with Section R307-107, Unavoidable Breakdown. of the Utah Air Quality Rules; the Emergency 

Planning and Community Right-to-Know Act (EPCRA), 40 CPR Part 355; and the Comprehensive Environmental 

Response, Compensation, and Liability Act (CERCLA) 40 CFR 302.6, we notified your office of an equipment 

breakdowns on November 4, 2005 due to an upset of our amine unit and concurrent interlock of our sulfur 

recovery unit (SRU).. . 

Notification: The following notifications were made: 

Gary Olsen made notifications on April 9, 2006 at 8:59 a.m. to the Division of Air Quality (DAQ) (left message 

with answering service), the State Emergency Response Committee (SERC) (Craig Hart), and to the Local 

Emergency Planning Commission (LEPC) (Sue Campbell-left message). 

Affected Units: North flare, SRU (Unit 17) 
• 

April 10, 2006
 

Mr. Richard Sprott, et. al.
 

Page 2
 

Cause and NaMe of Event: The SRU interlocked on low combustion air that apparently resulted from 

pressuring up of the reactor due to a plugged sulfur leg. Upon investigation, the steam jacket on the second leg 

was found to be cold. 

Duration of Event: Acid gas was flared from 8:09 a.m. unti110:l5 a.m. Sour water stripper gas was flared from 

___ 8:1.L~lJ?o,-u.P-ti11l:11 a.m. Overall, flaring from the upset lasted just over 3 hours. 

Estimated Ouantity of Pollutants Emitted During the Event: The estimated amount of excess emission was: 

South Flare 1820 

Steps Taken to Control Emissions: The steam flow to the second sulfur leg jacket was repaired, and the leg 

heated to restore flow. The SRU was restarted. The Catalytic Cracking Unit was already on reduced charge 

due to the SRU turnaround that had just been completed. 

If you have any questions or need additional information, please call me at (801) 299-6660. 

Michael 

~kS. Astin, P.E. 

Environmental Engineer 

'./ 

..i.: 

.;..~ -'. ,." 

Inm~~~rr=r~down Reports\2006\RE01 

.~., .. '" ~tD:ifii~;.s.,<t,2j~4

Holly Refining &Marketing Co~panY:·i;Wbodsc " ..' '-"'-~.. ,'­ -.. : '. -. ", 

.:.: 

c: 

. ,......;, 
Date /Tlme 

4/9/06 8:09 AM 

4/9/0611:12 AM 6.72 12.71 3.0500 34% 67% 28.43 1819.7 

Total 302 = 1819.7 

H2S Concentration Test Acid Gas SWSGas 

from 6/05 periormance 1 66.30% 33.89% 

-------_._. ,... test 2 65.82% 33.19% 

3 68.23% 33.37% 

4 68.51% 34.09% 

Average 67.22% 33.64% 
HOLLt
 

REFINING & MARKETING COMPANY - WOODS CROSS 

393 South 800 West. Woods Cross, Utah 84087·1435 

(801) 299-6600 • Fax (801) 299-6609 

_. __April 17,2006 

Mr. Richard Sprott, Director
 

Division of Air Quality
 

Utah Dept. of Environmental Quality
 

150 North 1950 West
 

Salt Lake City, Utah 84114
 

Mr. Neil Taylor 

Div. of Environmental Response & Remediation, SERC 

Utah Department of Environmental Quality 

PO Box 144840, 168 North 1950 West 

Salt Lake City, UT 84114 

Mr. Brian Law
 

Davis County Sheriff's Department
 

Davis County LEPC
 

800 W. State Street
 

Farmington, UT 84025
 

RE:	 Reportable];vent April 16-17, 2006
 

Unavoidable Breakdowns
 

To Whom It May Concern: 

CERTIFIED MAIL: 7002 3150 0003 6280 9626 

CERTIFIED MAIL: 7002 3150 0003 62809633 

CERTIFIED MAIL: 700231500003 62809640 

In accordance with Section R307-107, Unavoidable Breakdown, of the Utah Air Quality Rules; the Emergency 

Planning and Community Right-to-Know Act (EPCRA), 40 CPR Part 355; and the Comprehensive Environmental 

Response, Compensation, and Liability Act (CERCLA) 40 CFR 302.6, we notified your office of an equipment 

breakdowll on April 16-17, 2006 due to a plugged control valve in the line feeding our sulfur recovery unit (SRU). 

Notification: The following notifications were made: 

Michael Astin made notifications on April 17, 2006 at 12:16 p.m. to the Division of Air Quality (DA.Q) (left 

message on Joe Randolph's answering machine), the State Emergency Response Committee (SERC) (left message 

with the after hours answering service), and to the Local Emergency Planning Commission (LEPC) (Sue 

Campbell). 

Affected Units: North flare, SRU (Unit 17) 
April 17,2006
 

Mr. Richard Sprott, et. al.
 

Page 2
 

Cause and Nature of Event: The control valve on the line feeding the SRU plugged, resulting in gas being 

rerouted to the flare. The SRU continued to operate without upset, and there were no visible emissions. 

Duration of Event: The valve opened to the flare at 8:24 p.m. onAprill6, 2006 and closed automatically at 10:20 

p.m. It reopened at 3:13 a.m. on Aprill?, 2006 and stayed open until 8:05 a.m. The event lasted for 11 hours 41 

minutes, during which acid gas was flared for a total of 6 hours 48 minutes. ----_.--'"~...... ..." .. , 

Estimated Quantity ofPollutants Emitted During the Event: The estimated amount of excess emission was: 

South Flare 5810 

Steps Taken to Control Emissions: The control valve was bypassed and steamed out to remove the pluggage. 

After cleaning out the valve, it was placed back into service, and nonnal operation resumed. Gasses bypassing 

the SRU were combusted in the flare. 

Ifyou have any questions or need additional information, please call me at (801) 299-6660. 

Sincerely, 

p/46 

Michael S. Astin, P.E.
 

Environmental Engineer
 

c: 

..

O:EnVironm;~~reaown Rep9 

~~~i:~; ·"~.i\1~~~0 .. 

S. James . 
Date / Time 

4/16/068:24 PM 

4/17/068:05 AM 0.00 46.91 11.6833 34% 67% 82.98 5310.5 

Total S02 = 5310.5 

H2S Concentration Test Acid Gas SWS Gas 

from 6/05 performance 1 66.30% 33.89% 

~-----~.-~--- test·· 2 65.82% 33.19% 

3 68.23% 33.37% 

4 68.51% 34.09% 

Average 67.22% 33.64% 
;.... , 

REFINlNG & MARKETING COMPANY - WOODS CROSS 

393 South 800 West. Woods Cross, Utah 84087-1435 

(801) 299·6600 • Fax (801) 299-6609 

June 27, 2006 

Mr. Richard Sprott, Director CERTIFIED MAIL: 7002 3150000362809916 

Division of Air Quality 

Utah Dept. of Environmental Quality 

150 North 1950 West 

Salt Lake City, Utah 84114 

Mr. Neil Taylor CERTIFIED MAIL: 70023150000362809923 

Div. of Environmental Response & Remediation, SERC 

Utah Department of Environmental Quality 

PO Box 144840,168 North 1950 West 

Salt Lake City, UT 84114 

Ms. Sue Campbell CERTIFIED MAIL: 70023150000362809930 

Davis County Sheriffs Department 

Davis County LEPC 

800 W. State Street 

Farmington, UT 84025 

RE:	 Reportable Event June 26, 2006
 

Unavoidable Breakdown.
 

To Whom It May Concern: 

In accordance with Section R307-107, Unavoidable Breakdown, of the Utah Air Quality Rules; the Emergency 

Planning and Community Right-to-Know Act (EPCRA), 40 CFR'Part 355; and the Comprehensive Environmental 

Response, Compensation, and Liability Act (CERCLA) 40 CPR 302.6, we notified your office of an equipment 

breakdown on June 26, 2006 due to broken blower belt and resulting interlock of the Sulfur Recovery Unit (SRU). 

Notification: The following notifications were made: 

Clifton Oppenhein made notifications on June 26, 2006 at 1:52 p.m. to the Division of Air Quality (DAQ) 

(Debbie), at 2:02 p.m. to the State Emergency Response Committee (SERe) (Alisa), and at 2:10p.m. to the Local 

Emergency Planning Commission (LEPC) (left voice message). 

Affected Units: North flare, SRU (Unit 17) 

Cause and Nature of Event: The drive belt on the east blower broke, causing interlock and shutdown of the 

, SRD. 
June 27, 2006 

,'" , ~, Ri~b.ard Sprott, et. al, 

"", Page 1 

, Duration of Event: The interlock occurred about 11:15 a.m. Acid gas was flared from 11 :24 a.m. until 12:39 p.m.,
 

." 'for a total of 1 hour 15 minutes.
 

. pstimated Quantit" ofPollutants Emitted DurinQ: the Event: The estimated amount of excess emission was: 

"!.:; ".... " 

"Source."·" 

North Flare 

Steps Taken to Control Emissions: The west blower was locked out for maintenance, and an attempt was made 

to see if it would function adequately until the east blower could be repaired. When this failed, the belt from 

the west blower was installed on the east blower and the SRU was restarted. Gasses bypassing the SRU were 

combusted in the flare. 

Ifyou have any questions or need additional information., please call me at (801) 299-6660. 

Sincerely, 

Michael 

#/#

S. Astin, P.E. 

Environmental Engineer 

O:EnviroI1lI1P/-tj\l 

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3150 0003 6280 ,"

S.J 9916

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;•. Mr. Richard W. Sprott, Director 

,:.,~,." Division of Air Quality Utah Dept. of Environmental Quality 

]50 North J950 West ~: Salt Lake City, Utah 84114 

lt~T

'-;- . 

Holly Refmlng & Marketing Company - Woods Cross Refinery, 39.3, South 600 we~t. Wo~dsCross: UT 64067.1435,Phone (801 ).299-6600. Fax (801) 299-6609 

...
 
Date / Time 

6/26/06 11 :24 AM 

6/26/06 12:39 PM 0.00 17.67 1.2500 34% 67% 31.25 1999.8 

Total S02 = 1999.8 

H2S Concentration Test Acid Gas SWSGas 

from 6/05 performance 1 66.30% 33.89% 

test 2 65.82% 33.19% 

3 68.23% 33.37% 

4 68.51% 34.09% 

Average 67.22% 33.64% 
HOLLy'
" 

REFINLNG & MARKETING COMPANY ­ WOODS CROSS I':', ,:, 

;,:::, :.; 

~''.;;:''''

393 South 800 West. Woods Cross, Utah 84087·1435 

(801) 299·6600 • Fax (801) 299·6609 ,. 

(:,::" , ',,:, ~:~~ , 

, ,~:'

; June 28, 2006 

"Mr. Richard Sprott, Director CERTIFIED MAJL: 7002 3150 0003 6280 9947 

Division of Air Quality 

Utah Dept. of Environmental Quality 

150 North 1950 West 

Salt Lake City, Utah 84114 

Mr, Neil Taylor CERTIFIED MAIL: 70023150000362809954 

Div. of Environmental Response &Remediation, SERC 

Utah Deparonent of Environmental Quality 

PO Box 144840, 168 North 1950 West 

Salt Lake City, UT 84114 

Ms. Sue Campbell CERTIFIED MAIL: 7002 3150 000362809961 

Davis County Sheriff's Department 

Davis County LEPC 

800 W. State Street 

Farmington, UT 84025 

RE:	 Reportable Event June 28, 2006 

Unavoidable Breakdown' 

To Whom It May Concern: 

In accordance with Section R307-107, Unavoidable Breakdown, of the Utah Air Quality Rules; the Emergency 

Planning and Community Right-to-Know Act (EPCRA), 40 CFR Part 355; and the Comprehensive Environmental 

Response, Compensation, and Liability Act (CERCLA) 40 CFR 302.6, we notrned your office of an equipment 

breakdown on June 26, 2006 due to broken blower belt and resulting interlock of the Sulfur Recovery Unit (SRU). 

Notrncation: The following notifications were made: 

Otis Helmick made notifications on June2~, ~006 at 4:41 a.m. to the Division of Air Quality (DAQ) and the State 

Emergency Response Committee (SERC) (indicated they would call back), and at 4:45 a.m. to the Local 

Emergency Planning Commission (LEPC) (left voice message for Sgt. Campbell). A1 Jones (SERC) called back 

later in the morning and discussed the event with Michael Astin. 

Affected Units: North flare, SRU (Unit 17) 
.~t:.v:' .
 f .' ..j~. ". _..
 

June 28, 2006
 

Mr. llicbird Sprott, et. al.
 

Jlage 2
 

Cause and , . Nature of Event: The drive belt on the east blower broke, causing interlock and shutdown of the 

SRUThis belt had been replaced just two days prior. Shortly after replacing it, the belt broke again. 

", ..... Du;.atioIl of Event: The interlock occurred about 4:02 a.m. Acid gas was flared from 4:05 a.m. until 1:00 p.m., for 

'a total of 8 hours 55 minutes. Sour water stripper gas was flared from 4:06 a.m. until 1:08 p.m., for a total of 9 

~";;"40 hours 2 minutes. The total duration ofthe upset.was 9 hours 6 minutes. 

'":':",-.-·,""·"··--~····~"'-"'-i --~

Estimated Quanti!\' ofPollutants Emitted DurinE' the Event: The estimated amount of excess emission was: 

. Source .: ..•. . -~;; . 

North Flare 10800 

Steps Taken to Control Emissions: Two pump mechanics were called out to replace the belt on the blower. 

After the belt broke again, the manufacturer was called out to assist with replacement. Delivery of replacement 

belts was expedited. Gasses bypassing the SRU were combusted in the flare. 

Ifyou have any questions or need additional information, please call me at (801) 299-6660. 

Sincerely, 

Michael 

~£S. Astin, P.E. 

Environmental Engineer 
Date I Time 

6/28/06 4:05 AM 

.'6/28/06 1:08 PM 42.76 73.70 9.0500 34% 67% 168.22 10765.9 

Total S02" 10765.9 

H2S Concentration Test Acid Gas SWS Gas
 

from 6/05 performance 1 66.30% 33.89%
 ',-.' ;":­ test 2 65.82% 33.19%
 

3 68.23% 33.37%
 

4 68.51% 34.09%
 

Average 67.22% 33.64% 

~\ . 
CD [HOLLY] 

REFINI·NG & MARKETING COMPANY - WOODS CROSS
 

393 South 800 West. Woods Cross, Utah 84087-1435
 

(801) 299-6600 • Fax (601) 299-6609
 

July 31, 2006 

Mr. Richard Sprott, Director CERTIFIED MAIL: 70060100000707576176 

Division of Air Quality 

Utah Dept. of EnvirOlill1ental Quality 

150 North 1950 West 

Salt Lake City, Utah 84114 

Mr. Neil Taylor CERTIFIED MAlL 70060100 0007 0757 6183 

Div. of Environmental Response & Remediation, SERC 

Utah Department of Environmental Quality 

PO Box 144840, ] 68 North 1950 West / 

Salt Lake City, lIT 84114 

Ms. Sue Campbell CERTIFIED MAIL: 70060100 0007 07576190 

Davis County Sheriffs Department 

Davis County LEPC 

800 W. State Street 

Farmington, UT 84025 

RE:	 Reportable Event July 28-29,2006
 

Unavoidable Breakdown
 

To \VllOm It May Concern: 

In accordance with Section R307-107, Unavoidable Breakdown, of the Utah Air Qualit)' Rules; the Emergency 

P1am:ung and Community Right-to-Know Act (EPCRA), 40 CFR Part 355; and the Comprehensive Environmental 

Response, Compensation, and Liability Act (CERCLA) 40 CPR 302.6, we notified your office of an equipment 

breakdown on July 28-29, 2006 that caused operational problems and interlocks of our Sulfur Recovery Unit 

(SRU). 

Notification: The following notifications were made: 

Michael Astin made notifications on July 28, 2006 at 1:48 p.rn. to the Di.vision of Air Quality (DAQ) (Robert), at 

1:53 p.m. to the State Emergency Response Committee (SERC) (Craig Barnett), and at 1:59 p.m. to the Local 

Emergency Plamung Commission (LEPC) (left voice message for Sgt. Sue Campbell). Additional notifications 

were made on July 29, 2006 by Kelly Gallagher to the DAQ and SERC (Scott) at 4:45 a.m. and to the LEPC 

(message for Sgt. Campbell) at 4:47 p.m. 

Affected Units: North flare, SRU (Unit 17) 
July 31, 2006 

Mr. Richard Sprott, el. al. 

Page 2 

Cause and Nature of Event: Pluggage in the sulfur rundown legs (where the molten sulfur is drained from the 

SRU condensers into sulfur storage) caused backp,essure problems and upset of the SRU, resulting in 

interlocking of the unit. 

Duration of Event: The first interlock occurred about 10:55 a.m. on July 28. The sulfLlr legs were cJeared Oll! and 

the unit was operational by 2:35 p.IR However. a second interlock occurred around 7: 10 p.m" and the SRU Was 

restarted by 7:30 p.m. A third interlock occurred around 10:50 p.m. and lasted until about J2:05 a.m. 011 July 29. 

NOffi1al operation was restored by 4:50 a.m. 011 July 29. The total duration of the upset was about 18 hours. 

During this period, acid gas was flared for a total of 5 hours 4 minutes. Sour water stripper gas was flared for a 

total of 13 hours 3 minutes. 

Estimated Quantitv ofPollutants Emitted Durinll the Event: TIle estimated amount of excess emission was: 

Source 802 

(lbs) 

PMIO 

(lbs) 

NOX 

nbs) 

CO 

(lbS) 

VOC 

(lbs) 

North Flare 6400 - - - -

Steps Taken to Control Emissions: Operations staff quickly identified the problems causing the upsets and 

attempted to clear out the sulfur rundown legs and restart the unit as quickly as possible. Gasses bypassing the 

SRU were combusted in the flare. 

If you have any questions or need additional infonnation, please call111e at (801) 299-6660. 

Sincerely, 

~P6-- Q:i;llll: m:n ~:D SENDER: COMPLETE THIS SECTION a; ,	 'i<i 1l!Oj 1! it e.! m 

Michael ~,offi· !!!. S. Astin, P.E. ."	 $ft i~ • Complete items 1. 2, and 3. Also complet ~i 0 Q 

	 ~~ ~3 Environmental Engineer item 4 if Restricted Delivery Is desired. :; tl!i Ol 0 • Print your name and address on the rever - ~: ~\ i~	 ;~ '"

.. 3i ." 2l~	 1:92. · so that we can return the card to you. "';:. '" s..<! E." It i "'n f	 i~ if III

~:EnVi~~s·n.~.m··Jrt.~ [i ""fi. i

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........
 Cll :r"g. 0 :?; () . """c 0 -.. --0» ~~;:;;::;.~ I Mr. Richard W. Sprott. Director CO """'" 1	 Division of Air Quality 8 ~.'2 » 

1\	 Utal) Dept. of Environmental Quality ::7 =2 S 

\	 150 North 1950 West 00 ... := '< "... 6_

Salt Lake City, Utah 84114 ::: 9­ 1	 :;:~ ri - () 

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1

1---------------:. Q" 

2. Article Number 700 (T'ransfer from Sl8rYlce label) 

\ PS Fonn 3811, February 2004 

Holly Reflning & Marketing Company' Woods Cross Refinery, 393 South 800 West, Woods Cross, UT 84087-1435, Phone (801) 299-6600, Fax (801) 299-6609 
Date / Time 

7/28/0610:57 AM 

7/29/06 4:49 AM 45.04 33.83 17.8667 34% 67% 99.69 6380.4 

Total 802 = 6380.4 

H2S Concentration Test Acid Gas SWSGas 

from 6/05 perfoliT1ance 1 66.30% 33.89% 

test 2 65.82% 33.19% 

3 68.23% 33.37% 

4 68.51% 34.09% 

Average 67.22% 33.64% 
',' 

REFINING & MARKETING COMPANY - WOODS CROSS 

393 South 800 West. Woods Cross. Utah 84087-1435 

(801) 299-6600 • Fax (801) 299-6609 

October 4,2006 

Mr. Richard Sprott, Director CERTIFIED MAIL: 7006 0100 0007 0757 6749 

Division of Air Quality 

Utah Dept. ofEnvironmental Quality 

150 North 1950 West 

Salt Lake City, Utah 84114 

Mr. Neil Taylor CERTIFIED MAIL: 70060100000707576756 

Div. of Environmental Response & Remediation, SERC 

Utah Department ofEnvironmental Quality 

PO Box 144840, 168 North 1950 West 

Salt Lake City, ur 84114 

Ms. Sue Campbell CERTIFIED MAIL: 70060100000707576770 

Davis County Sheriff's Department 

Davis County LEPC 

800 W. State Street 

Fanrrrington,ur 84025 

RE:	 Reportable Event October 3-4, 2006 

Unavoidable Breakdown 

To Whom It May Concern: 

In accordance with Section R307-107, Unavoidable Breakdown, of the Utah Air Quality Rules; the Emergency 

Planning and Community Right-to-Know Act (EPCRA), 40 CFR Part 355; and the Comprehensive Environmental 

Response, Compensation, and Liability Act (CERCLA) 40 CFR 302.6, we notified your office of an equipment 

breakdown on October 3-4, 2006 that resulted in an upset in our Sulfur Recovery Unit (SRU). 

Notification: The following notifications were made: 

Tom Yarrington made notifications on October 4,2006 at 4:00 a.m. to the Division of Air Quality (DAQ) and the 

State Emergency Response Committee (SERC) (Eric), and at 4:05 a.m. to the Local Emergency Planning 

Commission CLEPC) (left voice message for Sgt. Campbell). 

Affected Units: North flare, SRU (Unit 17), Sour Water Stripper Unit (Unit 18) 
October 4, 2006 

Mr, Richard Sprott, et. al. 

Page 2 

Cause and Nature of Event: Due to an equipment failure, some hydrocarbon leaked into the 3D-pound steam 

system, This caused an upset to the SRU, and the gas from the Sour Water Stripper was routed to flare until the 

hydrocarbon leak was found and stopped and the steam system cleaned up. 

Duration of Event: The upset to the SRU began around 5:00 p.rn. on October 3. Sour water stripper gas was 

diverted from the SRU and flared from 8:08 p.m. on the 3rd until 3:28 a.m. on the 4th, for a total of 7 hours 20 

minutes. 

Estimated Quantity ofPollutants Emitted During the Event: The estimated amount of excess emission was: 

Steps Taken to Control Emissions: "When the problem with the steam system was identified, personnel were 

assigned locate and correct the cause. Qnce this was complete, the steam system was circulated to remove the 

hydrocarbon. Once the steam system was stable, the Sour Water Stripper gas was routed back to the SRD. 

Ifyou have any questions or need additional information, please call me at (801) 299-6660. 

#AMichael S. Astin, P.E.
 

Environmental Engineer
 

eakdown Reports\2006\RE16 

c: .r) File S6-2 (4) 

• Complete items, 1, 2, and 3. Also complet • 

I item 4 If Restricted Delivery is desired. 00 

)l • Print your name and address on the reve :
 

II so that we can return the card to you.
 

l • or on the front If space permits.
 

I,. Article Addressed tc:
 

I~._.
 

i

i ~,'r Mr. Richard W. Sprott, Director
 ;! Division of Air Quality
 

I I Utah Dept. ofEnyjronme:llnl Quality


I 150North 1950West


I Salt Lake City, Utah S4114
 

i


I


I


: PS Form3S1 :1, February 2004 Do •


700
 : 2, ArtIcle Number
 

(T"ransfer from servIce label)
 

1
 

Attach this card to the back of the mailpi
 

i· 

Holly Refining & Marketing Company - Woods crd 
Date / Time 

10/3/06 8:08 PM 

10/4/06 3:28 AM 37.16 0.00 7.3333 34% 67% 32.89 2104.9 

Total S02 '" 2104.9 

H2S Concentration Test Acid Gas SWS Gas 

from 6/05 performance 1 66.30% 33.89% 

test 2 65.82% 33.19% 

3 68.23% 33.37% 

4 68.51% 34.09% 

Average 67.22% 33.64%