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ExxonMobil Refinery (2638), Baton Rouge

Releases of Nitrogen Oxide

LDEQ Accident Number
Accident Date
Point Source(s) Notes Amount of Release
05-BB009-1907

2005-12-09
FLARE
Cause: repairs were being done on an exchanger which caused the events to occur

Followup: No

Notes: the MEA from the scrubber was temporarily diverted to the slop system where it would not cause additional upsets. The tail gas from the tail gas clean up unit was diverted to the incinerators to reduce hydrogen sulfide emissions; the procedures for removing the absorber tower from service will be updated to reflect the potential to have hydrocarbon condense in the MEA system; . Air monitoring completed outside facility.
36.0 pounds
05-BB009-1884

2005-11-07
FLARE- No. 20 & 5
Cause: power failure caused compressor C-551 to shutdown resulting in flaring from No20 and No5 flares

Followup: No

Notes: A smaller compressor was started up to reduce flaring and the feed rates to the Cokers were reduced until C-551 could be restarted; an investigation was underway to determine why the automatic transfer to the backup power supply failed
52.0 pounds
05-BB009-1865

2005-09-14
FLARE- Alkylation Unit
Cause: a pump on the cooling tower shut down due to a structural failure on the filter of the pump. Caused alkylation unit to flare.

Followup: No

Notes: the machinest on the alkylation unit made immediate repairs to the pump and operations personnel were able to restart it; this was not preventable because the failure on the filter could not have been predicted
22.0 pounds
05-BB009-1859

2005-08-04
FLARE- No. 19
Cause: controls for the REA regenerators were switched to the control backup panel, so part of a controller could be repaired. The REA regenerators had difficulty operating and carried over liquid to the SRLA knockout drums triggering an overabundance of chemical releas

Followup: No

Notes: the refinery reduced rates to reduce the production of CAG.Ammonia acid gas production was stopped to allow the maximum amount of CAG to be processed.
87.0 pounds
No LDEQ Reported

2005-07-25
FLARE- No17 & 19
Cause: the sulfur plant shut down causing refinery upset and causing flaring from No17 and No18.

Followup: No

Notes: significant rate reductions were made to refinery units that send hydrogen sulfide to SRLA to reduce flaring.
53.0 pounds
05-BB009-1811

2005-06-21
FLARE
Cause: flaring occurred when the rate of the baton rouge fractionator was increased about 24 KB/D. Safety valve was faulty.

Followup: No

Notes: the safety valve was blocked away from the flare drum and Sorrento was notified.
36.0 pounds
05-BB009-1805

2005-06-20
FLARE
Cause: flaring occurred when the wrong fan was shutdown on No35 cooling tower; the breakers were labeled 'A' and 'B' instead of 'East' and 'West' so one was mistakingly shut down

Followup: No

Notes: pressure was reduce in No12 depropanizer by temporarily returning the West Cell to service. The flare was relit, which reduced the emissions of propylene and propane to the atmospher
1.0 pounds
05-BB009-1798

2005-06-15
FLARE
Cause: caused by the safety valve malfunction

Followup: No

Notes: this report involved 3 events over the course of 3 days; the source of the additional gas to RGCU was determined and the vapor pulldown line was opened to reduce pressure in the sphere. This allowed to safety valve to reseat; 63 pounds of nitrogen oxide was released during the incident on the 15th and 16th, and an additional 18 pounds were released on the 17th- making the total pounds released of nitrogen oxide
81.0 pounds
05-BB009-1784

2005-06-08
C-102 compressor
Cause: flare was caused by a leaking block valve that had been opened when work was being done on the compressor

Followup: No

Notes: the leaking block valve that was allowing additional hydrocarbon to be fed to the Refinery Gas Compression Unit was tightened down to stop the flaring
16.0 pounds
No LDEQ Reported

2005-04-30
FLARE- GLA-3x compressor
Cause: the MEA scrubber on No. 2 Light Ends Unit experienced an operational upset due to a high level in the MEA scrubber to overhead drum; GLA-3x compressor shut down causing the RGCU to become overloaded and a gas leakage which flared

Followup: No

Notes: operations attempted to restart GLA-3x and then reduced rates to the FCCU to eliminate flaring; a new alarm was added that is more visible and will alert the controller of increased level in the interstage drum; other items identified by the ongoing investigation will be evaluated and implemented; flaring occurred from 3:20 PM to 4:40 PM on April 30th; the Wet Gas Scrubber exceeded its regulatory limit of 500 PPM of carbon monoxide from 4-6PM; the carbon monoxide concentration increased to 639 PPM fhe hour from 1-2 on May 1st
167.0 pounds
No LDEQ Reported

2005-03-31
FLARE: GLA-3x compressor
Cause: flaring occurred due to an instrument problem on the Fluid Catalytic Cracking Unit

Followup: No

Notes: an alternate compressor was started up and the feedrate to the unit was reduced
82.0 pounds
05-BB009-1737

2005-03-09
FLARE (Nos. 5, 7, 8, 9, 17, 19, 20 and 23)
Incinerators, Sites 68 and 69
Waste Water Treatment Unit
Cause: 30 minute power failure on Bulk Power Station #2. See Notes

Followup: No

Notes: Information for both LDEQ Incident Report numbers included on same report. Electrician doing work in the area injured. Investigation underway and findings will be implemented. May put automatic bypasses around filters in case they plug. Emissionswere minimized because some units shutdown; the vent gas from TGCU was sent through the incinerators emitting sulfur dioxide instead of the more harmful hydrogen sulfide. Power failure caused the following refinery units to shut down: No. 10 PipestilSLA-10), West Coker, 200 and 400 Trains on the Sulfer Plant, the Tail Gas Clean-up Unit, No. 2 Powerformer, Heavy Cat Napatha Units, No.1 and No.2 Sour Water Strippers, and some Depronanizers. The following Chemical Plant Units also shut down: Linea
292.0 pounds
05-BB009-1721

2005-02-27
FLARE
Cause: the controller responsible for the operation of the Refinery Gas Compression Unit (RGCU) began experiencing problems

Followup: No

Notes: C-50 was started up to eliminate the flaring and was run on manual. Incident not preventable because normal preventative precautions not used due to concern over clanging noises.
24.0 pounds
05-BB009-1716

2005-02-19
FLARE
Cause: Control valves created excessive back pressure on the compressors at PCLA, which resulted in the compressor pressure control valve opening to the flare syste

Followup: No

Notes: Corrected controls for the pressure control valves for the first part of the flaring event and closed a block valve for the second part of the flaring event; report stated that the release was preventable, but eplained that the flaring from 10:17am to 1:49pm was not preventable because a level instrument was reading incorrectly, which allowed the gas to the flare system.
32.0 pounds
05-BB009-1711

2005-01-31
FLARE
Cause: faulty electrical connection caused the compressor to trip on the No. 2 Reformer (RHLA-2);

Followup: No

Notes: Restarted PHLA-2 and RHLA-2 and diverted HHLA's tail gas to lower pressure system. Refinery will investigate improvements to shutdown facilities.
35.0 pounds
92695

2006-12-17
FLARE - #17 and #19 Flares
Cause: -compressors had to be shut down for repair - compressor trip.

Followup: No

Notes: This incident was not preventable because the compressor trip that caused the flaring incident was unexpected. If the findings of this investigation indicate that the cause of the trip was preventable, a modified report will be issued. Remedial Measures - an investigation is ongoing and the appropriate follow-up actions will be completed. an assistant operator at the Refinery Gas Compression Unit (RGCU) noticed an unusual noise coming from one of the refinery gas compressors C-50. These was evaluated by compressor specialists and it was determined that the compressor had to be shut down for repair. An advanced notification was made in anticipation of the flaring event since the spare compressor was unavailable due to other mechan
80.0 pounds
91379

2006-10-16
FLARE - #17 and #19 Flares
Cause: the cause of the flaring was high pressure in the refinery gas collection system due to a high volume of vent gas from the other refinery units. The source of the high vent gas rate was unable to be determined.

Followup: No

Notes: This incident was not preventable because the remedial actions were initiated before the flaring incident. These actions should have been sufficient to reduce vent gas rates. Two primary actions were initiated to reduce refinery vent gas rates. First, the compressor at the Hydrocracker was lined with the Refinery Gas Compression Unit Compressors to assist with processing refinery vent gas. Secondly, the crude feed rate to Pipestill #10 was decreased. Remedial Actions -an invgation is ongoing and the appropriate follow-up actions will be completed. The reportable quantity for nitrogen oxide has been exceeded.
10.0 pounds
90901

2006-09-26
FLARE - #5, #9, #17, #19, #23, #24 Flares
Cause: a control system power failure at the Refinery Gas Compression Unit caused a reduction in compressor capacity due to poor compressor control. As a result of the reduced capacity, the compressors were unable to process all of the refinery gas and the excess gas was routed to the refinery flare syste

Followup: No Information Provided

Notes: This incident was not preventable because the failure of the compressor control system was a result of a failure in both the primary and alternate power supply systems. The back-up power system should have supplied power to the compressor control systemwhen the primary failed to do so because of an electrical malfunction. Remedial Measures - an investigation is ongoing and the appropriate follow-up actions will be completed. Reportable quantities for nitrogen oxide and sulfur dioxide were exceeded.
27.0 pounds
90267

2006-08-26
FLARE - #17 and #19 Flares
Cause: the level indicator on the #4 Light Ends T-103 amine scrubber tower failed to function properly. Excess gas was flared in the #17 and #19 flares.

Followup: No

Notes: This incident was not preventable because failure of the level instrumentation was unexpected. Remedial Measures - an investigation is ongoing and the appropriate follow-up action will be completed. As a result of the faulty level indication, hydrocarbons were carried under to the amine regeneration unit and subsequently the refinery gas collection unit. The gas collection unit was unable to handle the increased load and therefore the excess gas was flared in the #17 and #19 flares.&##34;Reportable quantities for sulfur dioxide, nitrogen oxide, nitrogen dioxide, butenes, and propylene were exceeded
154.0 pounds
89821

2006-08-08
FLARE - C-30 compressor at the Refinery Gas Compression Unit - Flare #5, 23, 17, 19.
Cause: C-30 compressor at the Refinery Gas Compression Unit automatically shutdown due to a high vibration alarm. The high vibration alarm was due to work activities from nearby maintenance personnel. As a result of the shutdown, the refinery flared for 20 minutes from #5, 23, 17 and 19 flares. During the 20 minute flaring the #17 flare experienced a 5 minute duration during which the instrumentation indicates that a flame was not present. Hydrocarbons were being emitted to the air via the unlit flare.

Followup: No

Notes: There is no information as to why this incident was preventable. Remedial Measures - an investigation is ongoing and appropriate follow-up actions will be completed. NOTE: During the 20 min. flaring event, the #17 flare experienced a 5 min. duration during which instrumentation indicates that a flame was not present. According to the Light Ends Title V operating permit #2589-V3, issued April 11, 2006, flares must be continuously monitored to confirm the presence of a flame. It is constively estimated that during this 5 min. period when the pilot and flame were extinguished, hydrocarbons were being emitted to the air via the unlit flame. These circumstances resulted in the exceedence of the Louisiana State Police reportable quanti
15.0 pounds
86722

2006-03-24
FLARE - as a result of a leak from the ammonia gas line to the No. 100 Sulfur Plant (SRLA-100)
Cause: the pipe leaked due to new corrosion hole that had developed under the edge of a clamp that was installed in November. The existing clamp was tightened which did not stop the leak so it was replaced with a new clamp which also did not stop the leak. Since the newly installed clamp did not stop the leak, the old clamp was then reinstalled with a new gasket which still did not stop the leak. The feed spheres to the Sour Water Strippers became full which required the start up of the Sour Water Strippers to the flare syste

Followup: No

Notes: The incident was not preventable because, The clamp was installed in Nov. 2005 due to a pinhole leak from condensate corrosion. At that time, the line was x-rayed and no areas of concern were discovered outside the area under the clamp. Therefore, the corrosion hole that led to the release could not have been predicted. Remedial actions- a similar line exists to the SRLA-200 unit. This line will be inspected and repaired while the SRLA 200 unit is down. The letter to LDEQ ss that the reportable quantities for ammonia, hydrogen sulfide, sulfur dioxide, nitrogen oxide, and nitrogen dioxide were exceeded. Note: there is a time discrepancy - the report states that the incident started at 2:30pm on 03/24/2006 but was discov
270.0 pounds
86548

2006-03-16
FLARE - Alkylation Feed Preparation Unit
Cause: The Methyl Tertiary-Butyl Ether Unit was converted to an Alkylation Feed Preparation Unit (AFP). The AFP was beginning its initial start up. As the level in one of the towers increased, steam was added to the reboiler to begin producing overhead product. During this time, the safety valves on the tower began relieving to the flare system, which resulted in the reported flare. During the conversion of the unit the overhead pressure meter was reranged in the field, but was no reranged in the control room. Due to this oversight the operator believed he was at a significantly lower pressure and did not immediately discover that the safety valves on the tower had lifted to the flare system. The calculations automtically completed by the flare system

Followup: No

Notes: The cause of the accident is listed as preventable in the company's report, but there is no explanation whatsoever as to why it was preventable - that section is blank. The only remedial measure listed is that the pressure meter range was corrected in the control room. The letter to LDEQ states that reportable quantities of nitrogen oxide and butenes were exceeded.
50.0 pounds
86001

2006-02-22
FLARE
Cause: the 100, 200, 400 Sulfur Trains shut down due to high pressure on the primary burners. The 100 Train started up after 2min., the 200 Train started up after 3min., and the 400 train started up after 10min. During the time the Sulfur Trains were shutdown,the pressure increased on the MEA Regenerators, so clean acid gas was flared for 17min. Equipment failed due to a a failure to operate and maintain that equipment in a manner consistent with good engineering practice.

Followup: No

Notes: This event was not preventable -SEE Follow Up Consent Decree letter dated 04/07/2006 - Had the limit switch for valve 182 not been connected in the manner in which it was to the valve posistioner, then the AG Flaring Incident would not have occurred. The fact that valve 192 lacks valve posistion feedback to the Controller to indicate the actual posisiton of the valve was a signifigant contributing factor in this incident. A second contributing factor was that there as no visual checkitiated by the Controller, on the valve to provide absolute certainty that valve 182 was actually open. This was considered, for purposes of stipulated penealties under the consent decree, equipment failed due to a failure to oper
11.0 pounds
101612

2007-12-11
FLARE-Flare #17
Cause: water wash drum reading false high

Followup: No

Notes: level control valve was closed and instrument was cleaned and checked to determine working properly. Process checks conducted periodically to ensure working properly
13.0 pounds
100569

2007-10-27
FLARE-Flare #5,20
FLARE-Flare #5,20,23,24
Cause: Safety valve lifted and did not reseat after depressure

Followup: No

Notes: Measures were taken to reduce the operating pressure on unit. Safety valve was taken out of service and will be evaluated for proper set pressure.
56.0 pounds
100050

2007-10-09
FLARE-Flare #5,17,19,20,24
Cause: air supply line broke

Followup: Yes

Notes: feed to both PCLA units were reduced. Air to the regenerator was adjusted to increase CO concentration in the flue gas and return CO combustion to the normal level in furnace.
17.0 pounds
100015

2007-10-06
FLARE-Flare #17
Cause: Safety valve released to flare due to overpressure

Followup: No

Notes: Valve outlet line removed from service and D-105 was opened to relieve pressure
52.0 pounds
99374

2007-09-12
FLARE-Flare #5,8,9,17,23
Release
Cause: c-101 Recycle Compressor on the HCLA unit shutdown due to an instrumentation tubing failure. Compressor trip activated the units emergency depressureization procedure.

Followup: Yes

Notes: The unit was depressurized immediately in accordance to emergency procedures. Tubing on the seal oil pump was replaced and properly connected. The investigation is ongoin so an appropriate follow up will be completed. Under Investigation.
127.0 pounds
99194

2007-09-04
FLARE-Flare #5,9,17,23
Cause: cooling tower pumps shut down due

Followup: No

Notes: The cooling tower pump was restarted to restore cooling water to the unit. The speed control was repaired after it caused the unexpected shutdown.
62.0 pounds
96991

2007-06-11
FLARE-Flare #19
Cause:

Followup: No

Notes: Initially the flare was not noticed but when it was operating crews attempted to locate the source of the excess gas but by 2:37pm the system returned to normal, thus ending the flar
26.0 pounds
96828

2007-06-06
Flare
Cause: cooling tower pump failed

Followup: No

Notes: Several units were shut down to avoid a serious safety incident or property damage. The pump was repaired and returned to service
209.0 pounds
95990

2007-05-08
FLARE-Flare #5,20
Cause:

Followup: Yes

Notes: Attempts were made to restart compressor and without success a back up compressor was started. Feed rates were reduced to stop flaring.
66.0 pounds
95842

2007-05-02
Flare
Cause: broken air supply line was closed to control valve

Followup: No

Notes: Closed valve was bypassed until repairs,it was then replace
170.0 pounds
95549

2007-04-22
Flare/Safety valve release
Cause: leaking seal/safety valve release

Followup: Yes

Notes: Several actions were taken to avoid or reduce the environmental impacts from this incident. The different gas streams were redirected in a manner appropriate to minimize emissions.
123.0 pounds
108484

2008-09-02
FLARE-Sour Water Stripper routed to flare
Cause: STORMS-Hurricane Gustav

Followup: No

Notes: no information given
1,797.0 pounds
108485

2008-09-01
FLARE- All 8 flares
FLARE-All 8 flares
Cause: STORMS-Hurricane Gustav

Followup: No

Notes: Refinery was safely and sytematically shutdown due to the hurricane. Learning from this even will be incorporated into future hurricane preparations.
1,314.0 pounds
106981

2008-07-07
flare
Cause: Cause of release to the air form the flare is unknown.

Followup: No

Notes: Written report states no reportable quantities were exceeded.
1,000.0 pounds
104832

2008-04-17

FLARE
Cause: They are doing a planned power outage at the Methylethylketone (MEK) Unit and sending natural gas to the #5 flare.

Followup: No

Notes: There was potential to have pilot outages. They added natural gas to keep the pilots lit because the ignitors are electric.
potential exceedance
103871

2008-03-12
FCCU Stack
Cause: The FCCU stack was experiencing a spike in Nitrogen oxide emissions and to keep it in compliance they had to increase the ammonia injection for nitrogen oxide control. This had been going on for the past 2 days and possible excess ammonia i forming ammoniaum sulfate which might have caused the opacity problem.

Followup: No

Notes: A complaint was made about the excess particulate emissions from the calcraker scrubber stack as evidenced by opacity for the past couple of days. ExxonMobil Refinery state that they were not aware of any operational problems. On 3/12 they informed the LDEQ about the FCCU stack and that this had been going on for the past 2 days. The scrubber stack will undergo internal repairs and will be retested son. The stack test was to be conducted with the normal ammonia injection for nitrogen oxide control.
103358

2008-02-23
no information given/FLARE
Cause: no information given

Followup: No

Notes: Out of caution Exxon Mobile released written report of two flaring incidents that occurred within 24 hrs at the facility.
potential exceedance
103239

2008-02-19
no information given/FLARE
Cause: no information given

Followup: No

Notes: Out of caution Exxon Mobile released written report of two flaring incidents that occurred within 24 hrs at the facility.
potential exceedance
102529

2008-01-23
FLARE-Flare 9
Cause: Equipment Failure( leaking RGCU evacuator valve)

Followup: No

Notes: Report from Exxon Mobile surrounding the flaring incident stated that steam was injected into the flare drum, and the RGCU gas going to the flare drum was blocked out. The #9 flare was isolated from the rest of the flaring system. Report stated the leaking evacuator valve would be replace
17.0 pounds
102065

2008-01-02
FLARE-Flare 1
Cause: no information given

Followup: No

Notes: written notification from Exxon Mobile surrounding the flaring incident stating that no reportable quanties of nitrogen oxide had been exceeded. Report also stated that under caution Exxon Mobile reported to the Louisiana State Police because of a potential exceedance of the 10 lb. reportable quantity.
potential exceedance
102139

2007-12-08
FLARE-Flare 1
Cause: no information given

Followup: No

Notes: written notification from Exxon Mobile surrounding the flaring incident stating that no reportable quanties of nitrogen oxide had been exceeded. Report also stated that under caution Exxon Mobile reported to the Louisiana State Police because of a potential exceedance of the 10 lb. reportable quantity.
potential exceedance
102090

2007-12-05
FLARE-Flare 1
Cause: no information given

Followup: No

Notes: written notification from Exxon Mobile surrounding the flaring incident stating that no reportable quanties of nitrogen oxide had been exceeded. Report also stated that under caution Exxon Mobile reported to the Louisiana State Police because of a potential exceedance of the 10 lb. reportable quantity.
potential exceedance
117459

2009-08-22
no information given
Cause: Compressor malfunctioned leading to flares.

Followup: No

Notes: RQ not exceeded. Company reports and State Police HAZMAT report differs in pollutants.
116863

2009-07-28
flare system
Cause: PCLA-2 Fluid Catalytic Cracking Unit restart caused discharge. Unit unexpectedly shutdown earlier in the day. Restart caused pressure to build and ultimately flaring.

Followup: No

Notes: RQ for SO2 exceeded. State Police HAZMAT report and company reports differ in pollutants. Feed was reduced o the unit, temperatures within unit was decreased and compressor was restarted.
116539

2009-07-17
7 flares
7 unspecified flares
Cause: Compressor lost which caused flaring for 7 of the flares.

Followup: No

Notes: RQ not exceeded.
116294

2009-07-07
flare system
Cause: Safety valve lifted in the plant which caused 6 different flares to ignite.

Followup: No

Notes: This release estimate exceeds RQs. The incident was secured. LABB only has access to the SPOC verbal report, and all of these quantities are the initial estimates.
1,000.0 pounds
114733

2009-05-07
bypass stack
Cause: The Wet Gas Scrubber had a malfunction which led to failure of an expansion joining at CO Furnace, F-301. The malfunction required venting of PCLA 2 and 3 to bypass stacks and shutdown of Wet Gas Scrubber.

Followup: Yes

Notes: This incident exceeded RQs. PCLA-3 vented to bypass stack until shutdown was completed. All of the Wet Gas Scrubber nozzles were replaced. Root cause is under investigation.
5,819.0 pounds
114479

2009-04-27
FLARE
Cause: Flaring occurred when compressor tripped off line.

Followup: No

Notes: RQ not exceeded. Restarted compressor. No LDEQ report or follow up.
113842

2009-03-31
make-up hydrogen compressor (C-102B)
Cause: Make-up hydrogen compressor (C-102B) malfunctioned which caused a higher rate of hydrogen into C-102 compressor. This increased pressure which resulted in a safety valve release and caused flaring.

Followup: No

Notes: Release exceeded SO2 RQ. The safety valve was removed from service. Pressure maintained by companion safety valve. Compressor will be repaired. Company report and State Police HAZMAT report differs on pollutants released.
49.8
128382

2010-12-30
FLARE: Flare #17
Cause: Flare vent #17 released Nitrogen oxides and Nitrogen Dioxide. Though the initial report to State Police [SPOC] states that more than 1000 lbs of both gases were released, the refinery report states that no reportable quantities were exceeded.

Followup: No

Notes: This release was below reportable quantity.
0.6 pounds
127376

2010-10-28
FLARE
Cause: Pressure instrument failed & resulted in flaring. FLARE.

Followup: No

Notes: BRQ. Below Reportable Quantities.
122774

2010-04-14
FLARE: PCLA-2 [CCU]
Cause: Facility was called after smoky flare was noticed. A level instrument critical to unit operations that malfunctioned caused flaring. Exceeded RQ for SO2. Follow-up letter states that a recent analysis of the refinery flare system resulted in updated release amount: 1653 lbs

Followup: No

Notes: The unit was shut down to end the release. This incident is under investigation to determine the root cause in order to prevent reoccurrence. This release exceeded the 1,000 pound RQ value for SO2. LDEQ incident report indicate that this incident is #122774 and State police #10-01932. However, the refinery letter indicates that this incident is incident #s 122774, 123224, and 124285 and state police numbers 10-01932, 10-02386, 10-03389.
130240

2011-03-29
Flare: Unspecified flare
Cause: The GLA-3X gas compressor shut down resulting in flaring.

Followup: No

Notes: The 2x compressor was started to stop flaring.
136880

2012-02-01
Flare #17
Cause: The Alkylation Unit lost a cooling tower pump (P-451B), which resulted in the D-301 safety valve lifting and venting to flare #17 for 8 minutes.

Followup: No

Notes: ExxonMobil later determined that no reportable quantities were exceeded.
1.0 pounds
136547

2012-01-16
FLARE: Flare #17 and #23
Cause: The Feed Prep unit experienced an upset which resulted in flaring of SO2 from flares #17 and #23.

Followup: No

Notes: No information given regarding remedial actions taken. Initial notification of a release of an estimated 500 lbs of sulfur dioxide.
6.5 pounds