# [HOLLY]

REFINING & MARKETING COMPANY - WOODS CROSS 393 South 800 West. Woods Cross, Utah 84087-1435 (801) 299-6600 • Fax (801) 299-6609 

### January 25, 2010 Mr. Neil Taylor CERTIFIED MAIL: 7007 14900001 38614832 Div. ofEnvironmental Response 

### & Remediation, SERC Utah Department ofEnvironmental Quality PO Box 144840, 168 North 1950 West Salt Lake City, UT 84114 Sgt. Brent Peters CERTIFIED 

### MAIL: 7007 14900001 3861 4849 Davis County Sheriffs Department Davis County LEPC 800 W. State Street Fannington, UT 84025 

### RE: Reportable 

### Event January 19t 

### 2010 Unavoidable breakdown ofequipment To Whom 

### It May Concern: In 

### accordance withthe EmergencyPlanning and CommunityRight-to-Know Act (EPCRA), 40 CPRPart 355; and the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) 40 CPR 302.6, Holly Refining & 

### Marketing Company

- Woods Cross Refinerynotified your offices ofexcess emissions that resulted from 

### an unavoidablebreakdownthat affected our Ammonia StrippingUnit (ASU). Notification: The Night Superintendent notified the Division of

### Air Quality (DAQ), the State Emergency Response Committee (SERC) and the Local Emergency Planning Commission (LEPC) on January 20, 2010. The following table details notifications for this event.

SERC LEPC Hans Millican Voice mail
- Brent Peters Reported Event

### # 7654 Left a message. 01/20/2010 14:58 01/20/2010 15:04


### Affected Units: Ammonia StrippingUnit (Unit 22), SourWater Stripper (Unit 18), Amine Unit (Unit 16), NorthFlare Cause and Nature ofEvent: During the start up process ofthe new Ammonia Stripping Unit, the sourwater feed to the unit was being adjusted to balance the feed betweenthe two sour water tanks. This led to inconsistencies in the feed and the swinging feed compositions led to a buildup ofpressure in the unit. This pressure buildup affected Unit 16, Unit 18, and Unit 22 and caused acid gas and sour water gas to be sent to the flare. Duration ofEvent: Acid gas and sour water gas were routed to the NorthFlare onJanuary 19, 2010 from 15:53 to 18:24. Thetotal duration ofthe event was 2 hours and 31 minutes. Acid gas was sent to the flare for a total of2 minutes during the event. Sour water gas was sent to the flare for a total of 1hour and 43 minutes during the event.January 25,2010 Mr. Neil Taylor, Sgt. BrentPeters Page 2

Estimated Quantity ofPollutants Emitted During the Event:

North Flare 1216 

## I Steps Taken to Control Emissions: Operations put thevalve that opened to the flare into manual operation during the event to reduce the amount ofgas sent to the flare. Additional personnel were on siteto assist withthe unit startup and worked quickly to limit the amount ofgas sent to the flare. All excess acid gas and sour watergas was combusted 

### inthe flare to prevent direct venting to the atmosphere. Please contact me with any questions or comments at (801) 299-6619. I can bereached by email at bo.bothwell@hollycorp.com. Sincerely,

Bo Bothwell Environmental Engineering Specialist
RE 2010-01 ASU-SWS startup (20100119).doc CC: M. Astin (r) File S6-2 (4) B. Christensen S. James

Holl Refining & Marketing Company
- Woods Cross Refinery, 393 South 800 West. Woods Cross, UT 84087-1435, Phone (801) 299-6600, Fax (801) 299-6609Holly Refining and Marketing - Woods Cross Refinery Estimate of Emissions During SRU Upset

Date/Time 1/19/10 3:53 PM 1/19/10 6:24 PM 8.66 0.19 2.5167 82% 64% 19.01 Total S02= 1216.3 1216.3
H2S Concentration

from 10109 CCI performance test Dry Basis Test 1 2 3 4 5 0 Allerage Acid Gas 64% 64% 63%

64% SWSGas 31% 30% 28%

29%
Material Balance**Un~22** ASU/SWSGas 82%

RE 2010-01 ASU-SWS start up (20100119).xls 5/7/2010 1:06 PM Emissions Page 1 of 1REFINING & MARKETING COMPANY - WOODS CROSS 393 South 800 West. Woods Cross, Utah 84087·1435 (801) 299-6600 • Fax (801) 299-6609 

### February 15,2010 Mr. Neil Taylor CERTifIED MAll.,; 70093410000236330661 Div. ofEnviIonmentalResponse 

### &Remediation, SERC UtahDepartment ofEnvironmental Quality PO Box 144840, 168 North 1950 West Salt Lake City, UT 84116 Sgt. Brent Peters CERTIFlED 

### MATI...: 7009 3410 0002 3633 0678 Davis County Sheriffs Department Davis County LEPC 800 W. State Street Farmington, UT 84025 

### RE: Reportable Event February 10-11, 2010 Unavoidable breakdown ofequipment 

### To WhomItMay Concern: 

### In accordance withthe Emergency Planning and Community Right-to-Know Act (EPCRA), 40 CFR Part 355; and the ComprehensiveEnvironmental Response, Compensation, and LiabilityAct (CERCLA) 40 CFR 302.6, Holly Refining 

### & Marketing Company

- Woods Cross Refinerynotified your offices ofexcess emissions that resulted from an unavoidable breakdown that affected our SulfurRecoveryUnit (SRU). Notification: Bo Bothwell notified the State EmergencyResponse Committee (SERC) andtheLocal Emergency Planning Commission (LEPC) onFebruary 11,2010. The following table details notifications for this event.

### ;1::"-::;'Ag~~eS;'{r;':**'C9ht~~,tt;'>:~,;i;'~i;':** 

# ..,'>:";;:1-;;,,"';: "", ',;

# 11'7;;**'·;~rc:;/;;{:~>·.<** 

### ·.;i';;;

..**;3~:i~:0:'Z::>** SERC Kim Viehweg Reported Event LEPC Voice mail
- Brent Peters Left a message. 

## 'Y&?

.,,'", i", ',oJ/t,il'Ie 02/11/201012:21 02/11/2010 12:24


### Affected Units: Ammonia Stripping Unit (Unit 22), SourWater Stripper (Unit 18), Sulfur RecoveryUnit (Unit 17), AmineUnit (Unit 16), North Flare Cause and Nature ofEvent: 

### On February 10,2010 during the start up process ofUnit 22 after scheduledmaintenance, there was a buildup ofpressure 

### in the unit. This pressure buildup affected Unit 16, Unit 17, Unit 18, and Unit 22 and caused acid gas and sourwatergas to be sent to the flare. This release was below reportable levels. On February 11, 2010 while performing maintenance on the Unit 17 incinerator fuel gas valve, the incinerator interlocked and shutdown. Personnel immediatelytried to restart the incinerator but were unsuccessful due to a malfunction inthe pilot igniter. After 15 minutes ofthe incinerator being offline, the thermal reactor interlocked and as a result acid gas and sour water gas were sent to the flare. The combination ofthe two events exceeded the reportable limit.February 15,2010 Mr. Neil Taylor, Sgt. Brent Peters Page 2 Duration ofEvent: Acid gas and sour water gas were routed to the North Flare on February 10, 2010 from 12:35 to 13:43 and again on February 11, 2010 from 10:18 to 22:25. The total duration ofthe event was 33 hours and 50 minutes. Acid gas was sent to the flare for a total of3 hours and 40 minutes during the event. Sourwater gas was sent to the flare for a total of6 hours and 38 minutes during the event.
Estimated Quantity ofPollutants Emitted Duringthe Event:

North Flare 3946 Steps Takento Control Emissions: Operations immediately attempted to restart the incinerator. Maintenancepersonnel were called to assist with the unit startup and worked quickly to limit the amount ofgas sent to the flare. All excess acid gas and sour water gas was combusted in the flare to prevent direct venting to the atmosphere. Please contact me with any questions or comments at (801) 299-6619. I canbe reached by email at bo.bothwell@hollycorp.com. Sincerely,

BoBothwell Environmental Engineering Specialist
RE 2010-02 SRU Maintenance (20100210-20100211).doc CC: M. Astin (r) File S6-2 (4) B. Christensen S. James

Holly Refining & Marketing Company
- Woods Cross Refinery, 393 South 800 West, Woods Cross, UT 84087-1435, Phone (801) 299-6600, Fax (801) 299-6809Hollv Refining and Marketing - Woods Cross Refinery Estimate of Emissions During SRU Upset

Date/Time 2110/1012:35 PM 2111/10 10:25 PM 16.87 17.20 0.00 33.8333 87% 50% 6% 61.65 3945.5 Total S02= 3945.5
H2S Concentration Test Acid Gas SWS/ASU

from 01110 CCI 1 51% 88% performance test 2 50% 89% Dry Basis 3 51% 85% 4 5 6 Average 50% 87%
Moisture Content 4.90% 5.50%

Combined Stream SWS/ASU 22V3 H2S Concentration 82% 6.4% from Unit 22 Mat. Sal upset Stream SWS H2S Concentralioo 33%

RE 2010-02 SRU Maintenance (20100210-20100211).xls 51712010 

### 1:36 PM Emissions Page 1 of 1

# ~HOLLr
REFINING & MARKETING COMPANY - WOODS CROSS 393 South 800 West. Woods Cross. Utah 84087·1435 (801) 299-6600 • Fax (801) 299-6609 February 15,2010 Mr. Neil Taylor CERTIFIED MAIL: 70093410000236330685 Div. ofEnvironmental Response & Remediation, SERC UtahDepartment ofEnvironmental Quality PO Box 144840, 168 North 1950 West Salt Lake City, UT 84116 Sgt. Brent Peters CERTIFIED MAlL: 70093410 0002 36330692 Davis County Sheriff's Department Davis County LEPC 800 W, State Street Fannington, 

## ur 84025 

### RE: Reportable Event February 13-14, 2010
To WhomIt May Concern: Inaccordance with the Emergency Planning and Community Right-to-Know Act (EPCRA), 

### 40 CPRPart 355; and the Comprehensive EnvirontnentalResponse, Compensation, andLiabilityAct (CERCLA) 40 CPR 302.6, Holly RefIning & Marketing Company

- Woods Cross RefInery notifiedyour offices ofexcess emissions thatresulted from our Ammonia StrippingUnit (ASU). Notification: Bo Bothwell notifIed the State Emergency Response Committee (SERC) and the Local Emergency Planning Commission (LEPC) onFebruary 15, 2010. The following table details notifications for this event.

SERC LEPC Answering Service Voice mail- Brent Peters Reported Event Left a message. 02/15/2010 08:26 02/15/201008:29
AffectedUnits: Ammonia StrippingUnit (Unit 22), NorthFlare

Cause andNature ofEvent: On February 13, 2010 operators inadvertently changed the set point on the control valve that sends sour gas from 22V3 to the flare (22PC61OB) while trying to make an adjustment to the control valve that sends sour gas from 22V3 to 22V4 (22PC610A). Changingthe set point on 22PC61OB resulted inthe automatedprocess control adjusting the pressure in the vessel to maintainthenew set point. The valve to the flare 22PC61 

### OB was opened and sour water gas was sent to the flare.February 15, 2010 Mr. Neil Taylor, Sgt. Brent Peters Page 2 Duration ofEvent: Sour water gas was routed to theNorth Flare onFebruary 13, 2010 from 06:00 until February 14, 2010 at 10:23. Thetotal duration ofthe event was 28 hours and 23 minutes. Sour water gas was sentto the flare for a total of 17 hours and 33 minutes during the event.
Estimated Ouantity ofPollutants Emitted Duringthe Event:
I)"

### .·,;S~urc~:.· ...

## /;';i:::.:**'r::'SQdJ~s),** North Flare 4540 I;

### ~M10·(Ibs) ..:

### .;i~b~(u)~).[,:;~**>~O'(lb~):** 

## ...**vot'(lb~f··**
Steps Takento Control Emissions: Operations searched for sources ventingto the flare throughout the plantusingthermal detection onthe flare header. Once the source was determinedto be coming from Unit 22, a detailed search ofall vents in the unit was conducted andthe set point error was detected. The set point was corrected and flaring ceased. All excess sour water gas was combusted inthe flare to prevent direct venting to the atmosphere. Please contact me with any questions or comments at (801) 299-6619. I canbe reached by email at bo.bothwell@hollycorp.com. Sincerely,

Bo Bothwell Environmental Engineering Specialist
RE2010-03 22V3 (20100213-20100214).doc CC: M. Astin (r) File S6-2 (4) B. Christensen S. James

Holly Refining & Marketing Company
- Woods Cross Refinery, 393 South 800 West, Woods Cross, UT 84087-1435, Phone (801) 299-6600, Fax (801) 299-6609Holly Refining and Marketing - Woods Cross Refinery Estimate of Emissions During SRU Upset

Date/Time 2/13/10 6:00 AM 2/1411010:23 AM 0.00 0.00 420.62 28.3633 87% 50% 6% 70.93 Total S02 

### = 4539.8 4539.8
H2S Concentration

from 01110 CCI performance test Dry Basis Test 1 2 3 4 5 6 Average Acid Gas 51% 50% 51%

50% SWS/ASU 68% 89% 85%

67%
Moisture Content 4.90% 5.50%

Combined Stream H2S Concentration from Unit22 Mal. Bal Wei Basis SWS/ASU 82% 22V3 6.4%

RE 2010-03 22V3 (20100213-201 00214).xIs 5/7/20101:08 PM Emissions Page 1 of 1

# HOLLY

REFINING 

### & MARKETING COMPANY - WOODS CROSS 393 South 800 West. Woods Cross, Utah 84087-1435 (801) 299-6600 • Fax (801) 299-6609 

### February 25, 2010 Mr. Neil Taylor CERTIFIED MAIL: 7009 3410 000236330715 Div. ofEnvironmental Response & 

### Remediation, SERC UtahDepartment ofEnvironmental Quality PO Box 144840, 168 North 1950 West Salt Lake City, UT 84116 Sgt. Brent Peters CERTIFIED MAIL: 7009 3410 0002 36330722 Davis County Sheriff's Department Davis County LEPC 800 W. State Street Farmington, UT 84025 

### RE: Reportable Event February23,2010 Unavoidable breakdown ofequipment To Whom It

### May Concern: 

### Inaccordance with the Emergency Planning and Community Right-to-Know Act (EPCRA), 40 CFRPart 355; andtheComprehensive Environmental Response, Compensation, and Liability Act (CERCLA) 40 CPR 302.6; Holly Refining & 

### Marketing Company

- Woods Cross Refinery notified your offices ofexcess emissions that resulted from anunavoidablebreakdownthat affected our SulfurRecovery Unit (SRU). Notification: Bo Bothwell notified the State Emergency Response Committee (SERe) and the Local Emergency Planning Commission (LEPC) onFebruary 23,2010. The following table details notifications for this event.

02123/2010 15:05 Reported Event Kim Viehweg 

### SERe**,':';t~Ag~~ci*,;'~;'!·.·** !:Clol;ltaCti¥i

LEPC Voice mail
- Brent Peters Left a message. 02123/201014:59


### Affected Units: Ammonia StrippingUnit (Unit 22), Distillate Hydro-Treater, (Unit 19), Sour Water Stripper (Unit 18), SulfurRecoveryUnit (Unit 17), Amine Unit (Unit 16), CrudeUnit (Unit 8), NorthFlare Cause and Nature ofEvent: 

### OnFebruary22, 2010 the SRU incinerator stacktemperature started to fall. It was determined that there was a plug in the incinerator's fuel gas system. Maintenance was performed to clear the plug inthe fuel gas system. During the maintenance process, the incinerator flame went out and interlocked the SRU, sending acid gas and sour water gas to the flare. It was determined that the burner inthe incinerator had become plugged and the SRU would need to be shut downto performthe repair. The incinerator was temporarily re-ignited to initiate sulfur sheddingprocedures before shutting down the SRD. After sulfur shedding procedures were complete, the SRU was shut down to repair the burner. Duringthe SRU shutdown, acid gas was sent to the flare.February25,2010 Mr. NeilTaylor, Sgt. BrentPeters Page 2 Duration ofEvent: Sour water gas was routed to the North Flare on February 23,2010 from 11:29 to 13:51. Acid gas,was routed to the NorthFlare onFebruary 23,2010 from 11:19 to 12:39 and again from 16:31 to 20:00. Thetotal duration ofthe event was 8 hours and 41 minutes. Acid gas was sentto the flare for a total of4 hours and 51 minutes during the event. Sour water gas was sentto the flare for a total of2 hours and 23 minutes during the event.
Estimated Quantity ofPollutants Emitted During the Event: 

## ,;" '.;,:": " ".

.. .../; "'.,:'**;1:<.;~92XII;~)"** North Flare 2095

### .,~**;;;V;'~N1i:~?(I~~b** 

# . ":" NQJ({lb!i)**Y:~' ~')"~9~:)iib$l>'**  

## (}**,~;Y()G(~ b~)**  ..

### ,0

Steps Takento Control Emissions: Operations and Maintenancepersonnel made several attempts to clear theplug 

### inthe fuel gas system in an attempt to repair the system without having to shut down the SRU, Once it was determined that the SRU hadto be shutdown to perform the repair, sulfur shedding procedures went into effect to limit the resulting flaring. All excess acid gas and sour water gas was combusted in the flare to prevent direct venting to the atmosphere. Please contact me with any questions or comments at (801) 299-6619. I canbe reached by email at bo.bothwell@hollycorp.com. Sincerely,

Bo Bothwell Environmental Engineering Specialist
RE 2010-04 SRU Incinerator Burner (20100223).doc CC: M. Astin (r) File S6-2 (4) B. Christensen J. Crawley

Holly Refining & Marketing Company
- Woods Cross Refinery, 393 South 800 West, Woods Cross. UT 84087-1435, Phone (801) 299-6600, Fax (801) 299-6609Hollv Refining and Marketing - Woods Cross Refinery Estimate of Emissions During SRU Upset

Date/Time 2123/10 11:19AM 2/23110 8:00 PM 5.91 14.39 0.00 8.6833 87% 50% 6% 32.73 Total S02 '" 2095.0 2095.0
H2S Concentration

from 01110 CCI performance test Dry Basis Test 1 2 3 4 5 6 Average Acid Gas 51% 50% 51%

50% SWS/ASU 88% 89% 85%

87%
Moisture Cootent 4.90% 5.50%

Combined Stream H2S Concentration from Unit 22 Mal. Bal SWS/ASU 82% 22V3 6.4%

RE 2010-04 SRU Maintenance (20100223).xls 5/7/20101:08 PM Emissions

. Page 1 of 1

# HOLLY

REFINING & MARKETING COMPANY - WOODS CROSS 393 South 800 West. Woods Cross, Utah 84087·1435 (801) 299·6600 • Fax (801) 299-6609 April 20, 2010 Mr. Neil Taylor CERTIFIED MAIL: 70093410000236330784 Div. ofEnvironmental Response & Remediation, SERC UtahDepartment ofEnvironmental Quality PO Box 144840, 168 North 1950 West Salt Lake City,

# ur 84116 Sgt. Brent Peters CERTIFIED MAIL: 7009 3410000236330791 Davis County Sheriffs Department Davis CountyLEPC 800 W. State Street Farmington,

# ur 84025 

### RE: Reportable Event 

### April 9, 2010 Unavoidable breakdown ofequipment To WhomIt May Concern: In accordance withthe EmergencyPlanning and CommunityRight-to-Know Act (EPCRA), 40 CPRPart 355; andthe Comprehensive Environmental Response, Compensation, and LiabilityAct (CERCLA) 40 CFR 302.6, HollyRefining & Marketing Company

- Woods Cross Refinery notified your offices ofexcess emissions that resulted from an unavoidable breakdownthat affected our Sulfur Recovery Unit (SRU). Notification: Bo Bothwell notifiedthe State Emergency Response Committee (SERC) andthe Local Emergency Planning Commission (LEPC) onApril 9, 2010. The following table details notifications for this event.

SERC After Hours Reporting LEPC Voice mail
- Brent Peters Reported Event to Shelby Left a message. 04/09/201014:43 04/09/201014:46
AffectedUnits: Ammonia StrippingUnit (Unit 22), Sour Water Stripper (Unit 18), SulfurRecovery Unit (Unit 17), Amine Unit (Unit 16), North Flare Cause andNature ofEvent: On April 9, 2010 the SRU east combustion air blowermalfunctioned and shutdown, causing the SRU thermal reactor to shutdown on low air-flow. Operations switched from the east blower to the west blower and attempted to restart the SRU. When restarting the SRU, the westblower's belt broke. Maintenance replaced thebelt onthe westblower and the SRU was restarted. Duringthe shutdown of theunit acid gas and sour water gas were sent to the flare. Duration ofEvent: Acid gas and sour watergas wereroutedto theNorLhFlare onApril 9, 2010 from 13:23 to 14:29. Thetotal duration ofthe event was 1 hour and 6 minutes. Acid gas was sent to the flare for a total of1 hour and sour water gas was sentto the flare for a total of1hour and 4 minutes during the event.April 20, 2010 Mr. Neil Taylor, Sgt. BrentPeters Page 2

Estimated Quantity ofPollutants EmittedDuringthe Event:**~VOq(lbs)** i North Flare 751 Steps Takento Control Emissions: "When the east blower malfunctioned, the west blower was put online and the unit was restarted. When the west blowerbelt broke, maintenance worked quickly to replace the belt in order to restart the SRU. Once the SRUwas operational, the east blower was also repaired to ensure the back-up blower was available 

### ifneeded. All excess acid gas and sour water gas were combusted inthe flare to prevent direct venting to the atmosphere. Please contact me with any questions or comments at (801) 299-6619. I canbe reached by email at bo.bothwell@hollycorp.com. Sincerely,

Bo Bothwell Environmental Engineering Specialist
RE 2010-06 SRU (20100409).doc CC: M. Astin (r) File S6-2 (4) B. Christensen J. Crawley

Holly Refining & Marketing Company
- Woods Cross Refinery, 393 South 800 West, Woods Cross, UT 84087·1435, Phone (801) 299-6600, Fax (801) 299-6609Hollv Refining and Marketing - Woods Cross Refinery Estimate of Emissions During SRU Upset

Date/Time 419110 1 :20 PM 4191102:29 PM 2.62 4.31 0.00 1.1500 87% 50% 6% 11.73 751.0 Total S02

## = 751.0
H2S Concentration Test Acid Gas SWSIASU

from 01110 CCI 1 51% 88% performance test 2 50% 89% Dry Basis 3 51% 85% 4 5 6 Average 50% 87%
Moisture Content 4.90% 5.50%

Combined Stream SWSIASU 22V3 H2S Concentration 82% 6.4% from Unit 22 Mat. Bal

RE 2010-06 SRU Blowers (20100409) 5/7/20101:14 PM Emissions Page 1 of 1

# HOLLy'

REFINING & MARKETING COMPANY
- WOODS CROSS 393 South 800 West. Woods Cross, Utah 84087-1435 (801) 299-6600 • Fax (801) 299-6609 April 26, 2010 

### Mr. Neil Taylor CERTIFIED MAIL: 7009 3410 0002 36330814 Div. ofEnvironmental Response & Remediation, SERC UtahDepartment ofEnvironmental Quality PO Box 144840, 168 North 1950 West Salt Lake City, 

### UT 84116 Sgt. BrentPeters CERTIFIED 

### MAIL: 7009 3410 0002 3633 0821 Davis County Sheriff's Department Davis County LEPC 800 W. State Street Fannington, 

### UT 84025 

### RE: Reportable EventApril 12,2010 Unavoidable breakdown ofequipment To Whom ItMay Concern: In accordance withthe EmergencyPlanning and CommunityRight-to-Know Act (EPCRA), 40 CFRPart 355; and the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) 40 CFR 302.6, Holly Refining & Marketing Company

- Woods Cross Refinery notified your offices ofexcess emissions that resulted from an unavoidable breakdown that affected our SulfurRecoveryUnit (SRU)

.. Notification: Dustin Simmonds notifiedthe StateEmergency Response Committee (SERC) and the Local Emergency Planning Commission (LEPC) onApril 12, 2010. The following table details notifications for this event.

SERC LEPC Neil Taylor Voice mail
- Brent Peters Reported Event Left a message. 04/12/2010 16:45 04/12/201016:49
AffectedUnits: Ammonia StrippingUnit (Unit 22), Sour Water Stripper (Unit 18), Sulfur Recovery Unit (Unit 17), AmineUnit (Unit 16), North Flare Cause and Nature ofEvent: On April12, 2010 the level indication inthe Ammonia Stripping Unit scrubber 22V1 malfunctioned. The level inthe co1unm increased and liquid carried over into the sour water**knock~out** 

### drum inthe SRU. The liquid carry overpressuredup the SRU and interlocked theunit. During the shutdown ofthe unit acid gas and sour water gas were sent to the flare. Duration ofEvent: Acid gas and sour water gas were routed to the North Flare on April 9, 2010 from 13 :59 to 16:21. Thetotal duration ofthe event was 2 hours and 22 minutes. Acid gas was sent to the flare for a total of22 minutes and sour water gas was sent to the flare for a total of1hour and 50 minutes during the event.April 26, 2010 Mr. NeilTaylor, 8gt BrentPeters Page 2 Estimated Quantity ofPollutants Emitted During the Event:

North Flare 1723.5 Steps Taken to Control Emissions: Operations responded and emptied the knock out pot and lowered the liquid level in 22V1. Maintenance was performed to correct the level indication on 22V1 and alternative level control methods are currently being evaluated. All excess acid gas and sour water gas were combusted inthe flare to prevent direct venting to the atmosphere. Please contact me with any questions or comments at (801) 299-6619. I can be reached by email at boobothwell@hollycorp.com. Sincerely,

Bo Bothwell Environmental Engineering Specialist
RE 2010-07 8RU (20100412).doc CC: M. Astin (r) File 86-2 (4) B. Christensen 1. Crawley

Holly Refining & Marketing Company- Woods Cross Refinery. 393 South 800 West, Woods Cross, UT 84087·1435, Phone (801)**299~600,** Fax (801)**299~609**Hollv Refining and Marketing - Woods Cross Refinery Estimate of Emissions During SRU Upset

Date/Time 4112/101:59 PM 4112/104:21 PM 10.01 1.50 11.69 2.3667 87% 50% 6% 26.93 Total S02 = 1723.5 1723.5
H2S Concentration

from 01110 CCI performance test Dry Basis Test 1 2 3 4 5 6 Average Acid Gas 51% 50% 51%

50% SWS/ASU 88% 89% 85%

87%
Moisture Content 4.90% 5.50%

Combined Stream H2S Concentration from Unit 22 Mat. Bal SWS/ASU 82% 22V3 6.4%

RE 2010-07 SRU (20100412) 5/7/20101:15 PM Emissions Page 1 of 1