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CITGO Petroleum (1250), Lake Charles

Releases of Benzene

LDEQ Accident Number
Accident Date
Point Source(s) Notes Amount of Release
84791

2005-12-23
B-7 Flare
B-Topper Unit
Cause: Piping leak at the B-Topper Unit. Due to the temperature of the naphtha steam and the elevation of the line relative to the ground, the leaking material evaporated and did not reach the ground.

Followup: Yes

Notes: Original letter states that the phone call to report this incident occurred on December 24, 2005, while the follow up letter states the incident occurred on December 23, 2005 at 23:45 hours. Claims all pollutants were released as liquids but vaporized before reaching the ground. Heavy naphtha release was below reportable quantities. The pumparound piping from which the leak was coming was shutdown and isolated for repair when the Unit was shutdown. A Failure Analysis was scheduled for this incident. Second attached letter states that upon re-start up of the B-Unit Topper on December 29, H2S and SO2 were possibly released but below reportable quantities
15.0
82097

2005-09-11
B-5 FLARE
Cause: Overpressure of the E-402 Depentanizer Tower at B-Reformer unit.

Followup: No

Notes: Claims emission was below RQ initially.
Uncombusted
80796

2005-07-26
B-9 Flare
Cause: light ends over-pressurizing in Sulfolane Unit

Followup: No

Notes: Claims emission was below RQ
88679

2006-06-19
B-12 flare, wastewater treatment plant
Cause: Refinery experienced a heavy rainfall event, greater than 8 inches;of rain in 36 hours. 250 psig steam lines became submerged in water and as a result the steam condensed and caused a drop in pressure, eventually stopping the flow of rich amine throughthe Central Amine unit. This resulted in the loss of acid gas production. The SROs eventually shutdown due to lack of feed. Off gas went to the B-12 flare. Rainfall runoff exceeded the available capacity of the wastewater treatment system storm water tanks and the treatment system. When the capacity of the storm water tanks was exceeded, slop oil and wastewater overflowed from the tanks into the protective dike area surrounding the tanks allowing evaporation of benzene, etc.

Followup: Yes

Notes: The lack of amine treatment of refinery fuel gas caused the hydrogen sulfide content in fuel gas to exceed permit limits Hydrogen Sulfide amounts exceeded not reportedÉTo increase the pressure of the steam system and to reuce hydrogen sulfide generation, emergency steam and hydrogen sulfide shedding steps were initiated. Several units feed rates were reduced to minimum and some were shut down. As soon as acid gas was available steps were taken to restart the SRUs. For each restart operations pnnel followed standard operations procedures for startup and shutdown. When the storm water tanks began to overflow, steps were taken to remove slop oil from the tank dike using vacuum dikes. The feed rte of wastewater from the wastewater tanks to
7,863.0 pounds
06-BB006-910

2006-01-05
B-Topper Unit
Cause: During B Topper Unit restart after repairs, the heavy naphtha reflux piping was found to be ope

Followup: No

Notes: Bleeder valve was closed. Failure Analysis underway.
156.0 pounds
101823

2007-12-19
Cooling Tower 4
Cause: ruptured tube suspected as source of leak

Followup: No

Notes: Hydrocarbon leak in the c-711 Stabilizer Trim Condenser at the Isomerization Unit is cause of emissions.
100602

2007-10-29
Cooling Towers 5 and 6
Cause: see notes

Followup: No

Notes: Release results from hydrocarbon leak in the c-14 steam preheater at the Straight Run Fractionation Unit
98865

2007-08-23
Tank 145
Cause: See notes

Followup: No

Notes: Check valve stuck open at the A Reformer charge pump causes reverse flow of hydrogen into tank causing it to upset.
20.0 pounds
98773

2007-08-18
Sulfolane Unit
Cause: see notes

Followup: No

Notes: Emission results from control valve packing leak at the Sulfolane Unit
98523

2007-08-09
Cooling Tower 5
Cause: see notes

Followup: No

Notes: leak at E3 Debutanizer Tower C-07 Reboiler at Straight Run Unit causes emissiong from Cooling Tower 5
98497

2007-08-08
Tank 85
Cause: see notes

Followup: No

Notes: Leak discovered @ Reformate Tank 85 coming from 2 small holes immediately above the wind stiffener ring at the 36.5 foot level; Verbal report indicates failure of gauging system contributed to late detection of leak. REMEDIAL ACTION: A new safe operating fill height has been established below prior level. Tank 85 will be replaced. High level alarm has been lowered to prevent recurrence.
21.0 pounds
94672

2007-03-15
Tank #81
Cause: tank gauge was damaged and did not indicate that tank was overflowing; - tank seals damaged

Followup: No

Notes: Report indicates that DEQ deferred incident to next inspection. According to Citgo's Lebendorfer, liquid on side of tank was water from seal
94479

2007-03-09
JP244B pump B-9 Flare
Cause: JP244 B pump seal leaked to the flare drum

Followup: No

Notes:
111417

2008-12-14
Tank 190
Cause: Tank 190 high level alarm was improperly set

Followup: Yes

Notes: CITGO letter states that RQ for Benzene may have been exceeded; Alarm was was changed to provide proper indication of high level. Root cause analysis initiated.
92,578.0 pounds
108148

2008-08-19
B Reformer C 402B Fin Fan
Cause: see notes

Followup: No

Notes: Leak in the Fin Fan causes release
107212

2008-07-15
Sulften Vent EQT297 ; Tail Gas II Stack EQT 298
Cause:

Followup: No

Notes: Some pollutants released onto Highway, which was sealed off during clean up. 5.5 inches of rain in a 3 hour period led to depressurization in process units and various instrumentation problems; event met or approached the 25-year 3-hour intensity standard; Install three additional sumps, pumps, and associated piping in the steam trench to alleviate flooding during heavy ra
93.0 pounds
105850

2008-05-22
B-Reformer's C-408 Fin Fan Cooker
Cause: see notes

Followup: No

Notes: Leak in the Fin Fan Cooker causes release
104698

2008-04-11
K-16 Area
Cause: see notes

Followup: Yes

Notes: Reformate was released into a pit due to a faulty dresser coupling. The bolts in the coupling released. Dresser coupling replaced with hard piping.
1,490.0 pounds
103986

2008-03-15
Oily Water Sewer
Cause: see notes

Followup: No

Notes: Oily Water Sewer backs up in the Treating Plant Unit
103210

2008-02-19
Tank 197 Run Down Line
Cause: 6 inch line inside the plant was leaking during maintenace of the Tank 197 run down line

Followup: No

Notes: CITGO letter states that the emissions were BRQ but DEQ report indicates that the amount has yet to be determined
116326

2009-07-08
Benzene transfer pipeline
Cause: Leak was discovered in the Benzene Transfer line. Leak was due to corrosion.

Followup: No

Notes: Line was clamped and emptied. Damaged section will be replaced.
119.0 pounds
114984

2009-05-15
Tank 36
Cause: Oil was leaking from the bottom of tank 36. source of leak was the drain line, which drains water from the external floating roof, and runs internal the tank. The line developed a leak and was losing oil.

Followup: No

Notes: Drain line closed, and clean-up initiated.
278.0 pounds
127831

2010-11-24
C414 heat exchanger
Cause: Pinhole leak on B-reformer in product cooler in heat exchanger.

Followup: Yes

Notes: no information given
No LDEQ Reported

2010-01-12
No information given
Cause: "...release of Benzene associated with a flange leak in the oil movement area" Below reportable quantities

Followup: No

Notes: BRQ. Below Reportable quantities. No LDEQ report or number listed. Refinery Letter only.
141792

2012-08-02
K-16 pit
Cause: The cause of the incident was an unforeseen failure of a level indication to a control valve on a water wash vessel. This failure allowed hydrocarbons to enter the oily water sewer. Hydrocarbons from an oily water sewer backed up into the K-16 pit where a portion evaporated into the atmosphere.

Followup: No

Notes: Evaporative loss calculations indicate that Benzene and flammable gas reportable quantities were exceeded. The length of time was estimated from the time the water wash level controller valve output opened fully to the time the K16 pump pit was foamed and draining activities initiated. Upon discovery of hydrocarbon in the K-16 pit, a search of the source of hydrocarbon was initiated. When identified as the source of the hydrocarbon to the oily water sewer, the water wash valve was closed. In addition, foam was applied to the K-16 pit to limit the amount of evaporation to the atmosphere and vacuum trucks were called to remove the remaining material in the pit. A block has been added to the TDC water wash level controller to limit the flow rate of material to the oily water sewer.
59.0 pounds
140013

2012-05-25
A unit bonnet gasket on a pipeline
Cause: The spill resulted from a leaking pipeline bonnet gasket at "B" Dock, which is in oil movement A unit.

Followup: No

Notes: The area of the spill (10 cubic yards) was excavated and placed into a roll-off box that was sent to CWM for lab testing to profile and ship for disposal.
1.3 gallons
136963

2012-02-03
K-19 line leak
Cause: K-19 line leak. A dresser coupling failed and leaked 1 barrel of finished gasoline. Coupler between piping for a barrel. This is a seal between piping and vessel.

Followup: No

Notes: The materials were contained in a concrete area. The line was isolates, foam was added, and the line was repaired. Planning to replace it with a hard line. The RQs for Flammable Gas and VOCs were exceeded.
0.7 pounds
152862

2013-12-15

Oil movement B reformate line
Cause: A release of reformate and benzene to the soil due to a leak on a blend line. The line was 14 diameter and was being excavated to locate the leak location.

Followup: No

Notes: The leak was excavated and contaminated soils removed for disposal
152225

2013-11-07
Furnace Tube
Cause: A fire occurred on the A-Reformer combination furnace during startup. Preliminary indication is that a furnace tube, located in the convective section, developed a leak which resulted in a fire.

Followup: No

Notes:
10.3 pounds
151352

2013-09-21
Wastewater treatment unit
Cause: This incident involved a Benzene release associated with wastewater diversion CITGO's wastewater treatment plant. This wastewater diversion occurred as a result of a flash flood heavy rain event. CITGO diverted the wastewater into a concrete diked containment area surrounding the wastewater tanks. According to CITGO, the wastewater diversion was necessary to avoid overfilling of stormwater and equalization tanks. One of the WWTP Equalization Tanks (TK 310) had been out of service for inspection/maintenance going into the subject rainfall event.

Followup: No

Notes: Wastewater processing rates were maximized and material diverted to diked area was pumped to controlled storage as tankage became available. CITGO will be constructing a fourth wastewater storage tank as well as an additional API separator and aeration tank.
33.0 pounds
147293

2013-03-12
Distillate line near B-Reformer unit
Cause: On March 12, 2013, a leak was discovered on a distillate pipe, in the pipe rack east of the B-Reformer unit. It is believed that the leak was caused by internal corrosion of the distillate line. The event is currently under investigation.

Followup: No

Notes: Equipment which utilize the line were either shutdown or operated in such a way as to minimize the amount of material entering this line. Once minimized, the affected area of pipe was isolated and replaced with new piping. The affected area of piping has been changed out with new piping. In addition, this incident is under investigation.
59.0 pounds
156037

2014-05-18
Tank 143, EQT 0130, Logistics Area
Cause: Citgo reported a naphtha release from Tank 143 (A 23,500 barrel feed tank for the A Reformer Unit). The real ease began when there was a reverse flow of hydrogen (caused by an unexpected shut down of the A reformer feed pumps) into the tank from the A Reformer Unit. This reverse flow caused the level in the tank to increase rapidly, lifting the roof and damaging the floating roof seal, allowing product to drain off the roof and into the tank dike area. Fence line monitoring, conducted during the incident reported no readings of a volatile compound. As a effort to reduce VOC emissions, foam was applied to the product during the night. In a letter dated 5/23/14 Citgo requested additional time to provide release calculations for the incident. According to the report the LDEQ quants for flammable liquid and benzene from volatilization were exceeded. 53 barrels of Heavy Naptha Mixture were released from the tank and contacted the ground. Approximately 37.5 barrels were recovered and the balance evaporated. 50 pounds of Benzene a naphtha constituent released from evaporation.

Followup: Yes

Notes: As a corrective action the flow line was immediately blocked in, foam was applied to the spill area, and all liquid/contaiinated soil was removed and disposed of according the state regulations.
4.1 pounds