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HomeMy WebLinkAboutMINUTES - 04061999 - SD2 SDr2 THE BOARD OF SUPERVISORS OF CONTRA COSTA COUNTY, CALIFORNIA Date: April 6, 1999 Matter of Record Subject: Initial Status Report on the March 25, 1999 Chevron Incident On this date, the Board of Supervisors considered the Initial Status Report on the March 25, 1999, Chevron Incident as presented by Phil Batchelor, County Administrator and William B. Walker, M.D., Health Services Director (as attached). The following people offered comments on the matter: Marielle Boortz, Chevron, 841 Chevron Way, Richmond; Henry Clark, West County Toxics Coalition, 1©19 MacDonald, Richmond. Those desiring to speak having been heard, the report was acknowledged by the Board. THIS IS A MATTER.FOR RECORD PURPOSES ONLY NO BOARD ACTION WAS TAKEN a �w T(: BOARD OF SUPERVISORS Contra PHIL BATCHELOR, COUNTY ADMINISTRATOR WILLIAM B. WALKER, M.D., HEALTH SERVICES DIREC J . y..� Costa *rJ:. DATE: CountyMarch 31, 1999 rA< U SUBJECT: INITIAL STATUS REPORT ON THE MARCH 25, 1999 SPECIFIC REQUEST(S)OR RECOMMENDATION(S)&BACKGROUND ANIS JUSTIFICATION RECOMMENDATIONS: 1. ACKNOWLEDGE that the following sequence of events occurred on the afternoon of March 25, 1999: ! At 2:28 P.M. on March 25, 1999, a leak developed in the piping system in the lsomax Unit. The hydrofined gas oil which was released as a result of the leak detonated, resulting in a fire which produced a visible smoke plume. As a result of the fire and flaring, sulfur compounds present in the refinery streams were combusted,thereby forming sulfur dioxide. Some 18,000 pounds of sulfur dioxide was released. • Contact between Chevron and the Health Services Department was made at approximately 2:35 P.M, • The Ground Level Monitors around the refinery were reviewed. Only at one of the Monitors was there a trace of sulfur dioxide or hydrogen sulfide which peaked at 2:37 P.M. and then declined continuously to background levels within 30 minutes. The amounts of both chemicals were within BAAQMD violation levels. There were, of course, other hydrocarbons and particulate matter in the smoke which are certainly not recommended for breathing. $X r° . r CONTINUED ON ATTACHMENT: -YES SIGNATURE; 1 •� '� t'x ; -- - RECOMMENDATION OF COUNTY ADMINISTRATOR -RECOMMENDATION-RECOMMENDATION OF BOARD COMMITTEE APPROVE OTHER SIGNATUREM: : ACTION OF BOARD ON A bTIl 6, 1999 _ APPROVED AS RECOMMENDED OTHER - VOTE OF SUPERVISORS I HEREBY CERTIFY THAT THIS IS A TRUE UNANIMOUS(ABSENT - - - - -- ) CORRECT COPY OF AN ACTION TAKEN AYES: NOES: AND E ED ON THE MINUTES OF THE BOARD ABSENT: . - ABSTAIN. OF SUPERVIS ON THE DATE SHOWN, County Ad i strator ATTESTED - Contact: PHIL BATCHELOR,CL OF 7Hc BOARD OF cc: Health rvices Director SUPEAVISCRS AND COUN , MINISTRATOR D` tor, Hazardous Materials Division, HSD County Counsel BY DEPUTY The Health Services Department activated the five sirens surrounding the Chevron Refinery by computer at 2:39 P.M. This also activated notice to emergency responders and the media. The Community Alert Network(CAN)was put on alert at 2:43 P.M. and was activated at 2:46 P.M. for Chevron Zones 1 & 5, with the first message going out at 2:50 P.M. Through an error on the part of CAN, only 37 calls were made, all to numbers outside of Richmond. • The sirens were activated and computerized notification was made again at 2:51 P.M, The sirens alone were activated a third time at 3:01 P.M. On each occasion, the activation went smoothly and as anticipated. When the error on the first CAN notification was discovered by County staff and called to CAN's attention, CAN utilized one of the redundancies built into the system and called all of the telephone numbers in zip code 94861. However, before all calls could be completed, the shelter in place was downgraded to a health advisory and the calling was terminated. • The downgrade of the shelter in place to a level 2 (health advisory)was made at approximately 5:31 P.M. CAN was advised at 5:40 P.M. Completed calls totaled 10,416. �► The all clear was given at approximately 8:30 P.M. and the first calls went from the CAN system at 8:45 P.M. 2. RECOGNIZE further that the supplemental notification system, the CAN system, has its strengths and weaknesses. It is a resource that can be very useful. Over the nine years that we have had the system, it has been activated on 57 occasions for the following purposes: • 21 times for chemical incidents. • 20 times for walkaways at the Marsh Creek Detention Facility. 11 times for pre-arranged tests of the system. 1 time for flooding. « 1 time for a train derailment. • 1 for a lost child. 2 other times for miscellaneous purposes. According to the Health Services Department, on only one other occasion (in June 1992) has the CAN system failed to operate as anticipated. 3. RECOGNIZE that the Community Warning System (CWS),of which the sirens and computer notification are a part, is not yet fully functional and has not been accepted by the County. Despite the fact that the system does not belong to the County, staff attempts to make use of those parts of the system that are functional during an incident such as the Chevron explosion and fire. If and when the system is complete, has passed all tests and is functioning properly,we will consider recommending that the Board of Supervisors accept donation of the system. -2- 4. ACKNOWLEDGE the attached 72 hour report on the March 25, 1999 incident which was prepared by Chevron. 5. ACKNOWLEDGE that Chevron reports that the Isomax unit which has been shut dawn because of the explosion and fire represents 30% of the refinery's entire capacity. 5. ACKNOWLEDGE that the Richmond City Council has agreed to explore what would be involved in having the City Council adopt the County's Industrial Safety Ordinance and designate the County Health Officer to enforce it within the City of Richmond. 7. ACKNOWLEDGE that Chevron has agreed to have the Health Services Department conduct a root cause analysis which is currently underway. BAC GROUND: With the exception of the Community Alert Network (CAN) system, we believe that the emergency response to the Chevron incident worked well. Several fire districts provided mutual aid to the Richmond Fire Department. The portions of the Community Warning System which were utilized worked well. After the all clear was given,the reason for the error in calling was identified by CAN staff. They have adjusted their operational procedures in an effort to prevent this type of problem from occurring again. While the County has no direct enforcement jurisdiction over the Chevron Refinery, which is entirely within the City of Richmond, planning is underway with the City of Richmond which may result in Richmond's adoption of the County's Industrial Safety Ordinance and designation of the County Health Officer to enforce its health-related provisions within the City of Richmond. The land use provisions of the ordinance would be handled by the City's staff. -3- Chevron March 29, 1999 Chewrron Produab t;apruY P.o.Box 1232 Aichrwnd,CA 94802-0272 M.A.Gilt" Manager Lewis G.Pascalli,Jr. environmental and Safety Division Hazardous Materials Phrogr�dms Division Director Phone 51 B 24214001 Certified Unified Program Agency Contra Costa County Health Services Department Hazardous Materials Division 4333 Pacheco Boulevard Martinez.,CA 94553 72-flour Written l~ollow.Vp NodCleatlon Control Plumber 99-1361 Dear Mr. Pascalli: The Chevron Richmond Refinery, EPA M# CAD009114919, made a verbal notification on March 25, 1999. that there was a detonation and fire in our Isomax Unit. 71te attached form includes the infor=don requested for the 72-hour written follow-up report on this incident. Although the incident investigation has begun, preliminary conclusions have not been made since access to the plant site has been limited due to safety considerations. All questions regarding this event can be directed to our Public Affairs Department at 252-2400. c,Sincerely, Enclosures - — cc: Randall Sawyer Hazardous Materials Consultant Certified Unified Program Agency Contra Costa County Health Services Deputtrrent Hazardous Materials Division 4333 Pacheco Boulevard Martinez,CA 94553 Milne Racette Jeremy Kimball Enforce=nt division Bay Area Air Quality Managemcnt Division 939 Ellis St. San Francisco,CA 94109 Chevron Chevron '01 VIS AG 08y09,xH3-13 News I I Chevron Corporation Issued only in the Sun Frandsco/Bay Area P.o Box 7753 MEDIA ADVISORY San Francisco,CA 94120 7753 a3AI3038 Phone 415 894 4245 REFINERY STATUS REPORT CHEVRON REFINERY PROCESSING UNIT RENLAINS SHUT DOWN Investigation Continues into Cause RICHMONI D, Calif, March 31 — Chevron is continuing the investigation into the cause of the refinery's March 25 fire. Below is an update on the situation: • At approximately 2:30 p.m. last Thursday, a fire ignited in a hydrocracking unit as a result of a leak in the unit's piping system. • The hydrocracking unit remains shut down and it is not currently known when it will be restarted. • The fire was extinguished on Saturday, and work crews have been cooling and decontaminating the unit to ensure the area is secure and safe for investigative teams. • Chevron has launched its own investigation and is cooperating with independent investigations being conducted by CAL-OSHA, Bay Area Air Quality Management District and. Contra Costa Health Services, which received Chevron's required 72-hour (business days)report late Monday. • The refinery is operating about 70 percent of its gasoline capacity, which typically averages about 125,000 barrels per day. Gasoline production between Chevron's two California refineries, Richmond and El Segundo, Calif., is currently down about 10 percent. • Chevron is supplying its customers and compensating for the Richmond deficit by acquiring gasoline and blending components from other Chevron refineries.and outside vendors. • Chevron appreciates the swift and professional response from the local agencies and emergency response organizations. The quick action and outstanding efforts of the refinery employees and outside responders helped to safely contain the fire in a relatively short time. • The Chevron Richmond refinery, which employs about 1,450 employees and more than 104 contractors, is one of the largest refineries on the West Coast with a 240,000 barrel-per-day capacity. 3/31/99 Contacts: Marielle Boortz or Terry Swartz, Richmond — (510) 242-2400 CARD-11471:•96) Chevron Emergency Kumber (800)t57-2022 or (510)233-3737 Material Safety Data Sheet SULFUR DIC!]tXDE page I of 6 This Haterial Safety Data Sheet contains environmental, health and toxicology information for your employees. Tease make sure this information is given to thein. It also contains information to help you Deet community right-to-know/emergency response reporting requirements under SARA Title III and many other laws. If you resell this product, this MSDS must be given to the buyer or the information incorporated in your MSDS. Discard any previous edition of this MSDS. This revision removes the CAS Registry Number from Section 1 (Product Number) . This MSDS remains DISCONTINUED. 1 . PRODUCT IDENTIFICATION SULYUR DIOXIDE DANGER! - CORROS i VE CAUSES EYE AND SIC I N DAxd.AGE KARHFDL OR FATAL W INHALED PRODUCT INFORMATION: (510)242-7133 , 7=3o a.m. 5*00 p.m. PST Revision Number: 7 Revision Date; 08107!31 h5as Number; 1000584 NDA -- No Data Available NA - !Vat Applicable p epaxee ACcoeding to the OSKA h4%ard CQr"Untf.atiOn 5e;:jQatd 12,; Ci fi lo.i 2ut1 y Ely ttu, rhevrcn t-,i+ i ronmenr nl liNalLix Cootey, rt+C ss {g. Prov bC1SQ. 313�ritra�hfi, (t. 9C80t rXRST AID REASU RZS ' o EMERGENCY NUMBER {24 hr): (801))457-2022 or (514)233-3737 (Internationarl) EYE CONTACT Plush eyes immediately with fresh cater for at bast 1S kinutes while holding the eyelids open. Remove contact lenses if worn., see a doctor for further treatment as soon as possible. SKIN CONTACT: Remove contaminated clothing. 'Wash skin therbu�ghly with soap and crater. See a doctor immediately. Discard contaminated non-waterproof shoes and boots. Mash contaminated clothing. The chemical hazard requires an immediate full 15 minute washdown. INHALATION- if NHALATIONIf there are signs or symptoms as described in this document Clue to breathing this material., move the person to fresh air. If breathing has stopped, apply artificial respirations. Call a doctor. INGESTION: Not expected to be an ingestion problem, no first aid procedures are required. 3. IMMEDIATE HEALTH EFFECTS - (ALSO SES SECTIONS 11 & 12) EYE CONTACT. This substance is a severe eye irritant and could cause permanent damage to your eyes and blindness. The degree of the injury will depend on the amount of materia: that gets into the eye and the speed and thoroughness of the first aid treatment. Signs and symptoms may include pain, tears, swelling, redness, and blurred vision. SKIN IRRITATION: This substance is corrosive. Contact with the skin could cause permanent injury ( including scarring) to the affected area. Extensive and prolonged contact could cause significant injury and even death to underlying tissue. The degree of injury will depend on the amount of material that gets on the skin and the speed and thoroughness of the first aid treatment. signs and symptoms may include pain or a feeling of heat." discoloration, swelling, and .blistering. DERMAL TOXICITY: If absorbed through the skin, this substance is considered practically non-toxic to internal organs. RESP I RATORY/I NUALAT ION' This substance may be irritating if inhaled. signs and. symptoms of respiratory tract irritation may include, but may not be limited to, one or more, of the following: nasal disci:arae, sore throat, coughing, bronchitis, 'pulmonary edema and difficulty in breathing. 114GES c I ON: material is v gas and cannot usually be swallowed. Revision Number: 7 Revision Date: 08107/92 HSOS Number: 000584 NDA _- No Daus Available NA - Nest Applicable .. asm ur w-w aravaw✓w 4. PROTECTIVE EQUIPMENT EYE E' OTECTION: Appropriate eye; protection must be worn when working with this material or serious harm can result. Wear chemical Soggles and a take shield at all times. SKIN PROTECTLIOX: When handling this material, wear.i.mpervious protective clothing, which should include gloves, apron, overshot& and complete facial protection. RESPIRATORY PROTECTION: ION: Wear approved respiratory protection when working with this material,.. An air-supplying respirator is recommended. V'L✓'t TILLATION Ventilation must be demonstrated to be adequate to keep airborne concentrations of this material below the recotsanended exposure standards prior to using this material. S. FILE FXGITTYNG MEASURES FLASK Pt3.' NTt NA AtT OIGNITZON: NA FLAMMABILITY LIMITS (% by volume in air) : Lower: WA Upper: NA EXTINCUISIiING MEDIA: Material will nct burn. FILE FrGHT19r. PROCEDUPES: This material will not burn. For fires involving this material, do not enter any enclosed or confined fire space without proper protective equipment, including self-contained breathing apparatus. CONSU5TION PRODUCTS: None XFLPA RATINGS: Health 2:; Fla lability 0; Reactivity 0; Special NDA; TINTS rcATING:: Health 2. Flammability 0; Reactivity 0; Other HDA.; (Least-0, slight-1, Moderate-2, Iiigh-3, Extreme- ). "These values are obtained using the guidelines or published evaluations prepared by the National )Fire Protection Association (NFFA) or the National. taint and. Coating Association. 6- STORAGE, HANDLING, AXI) REACT I V 7 TY 1HiA.7ARDOUS DECOMPOSITION PPODUCTS: NDA STABILITY: St ab).0. HAZARnOUS POLYMFRIZATION: Po)yworizat loo, -,jM not occur. INCOMPATIBILITY: 14'ty rt%„C " L violenEly 9Lh `atcl' Or strOnO a ti:zt1C i;' aSl} 7'?La' Liyc3Yragen Revision Number: 7 Re'visica Date: 08/07/92 MSDS Nuamber: 000534 NIIA No oata Available NA - Not Applicable d,V i14'Mas ir6N.i.t VC4 gas on contact with zinc, aluminum, magnesium or Cadmium. SPECIAL PASC:Jt TIONS: Before entry into confined spaces that may have contained hazardous material. determine concentrations and take appropriate messures for personal protection. Material presents a hazard that may require personal protective equipment for entry. 7® PRYSIC.AL AND CRMKI°C.A.L PROPERTIES ODOR: Strang irritating. PHYSICAL STATE: Lo%f-boiling liquid or gas. PH. NBA VAPOR PRESSURE: NA VAPOR DENSITY (AIR=I) : %26 SOILING POINT: 14F FREEZING POINT: NDA MELTING POINT: -104F SOLUBILITY: Soluble in nater and alcohol. SPECIFIC GRAVITY: 1.43 (Liquid) DENSITY., NDA EVAPORATION RATE: NA PERC T VOLATILE (VOL): 100:k MOLECULAR WL I GHT: 64 $. ENVIROlNENTAL CONCERNS, ;FILL "SPONSE An DISPOs&L CHEX` RTC EMEROENCY NUMBER (24 hzl : <800)424--9200 or t2023483-7616 SPILLILEAR PRECAUTIONS: Certain geographical, areas have air pollution restrictions conccrning the use of materia)s in +kirk situations which may release volatile components to the atmosphere. Air pollution regulations shcvld be studied to determine if this material ,is regulated in Lhe area where it is to be used. If this material is released into a -ark area. ,evacuate the area immediately. Persons entering the contaminated area to correct the problem or to determ4 ne whether it is sate to resume normal activities must comply with all instruct,ions in the Protective EgvipmenL Section. DISPOSAL METHODS Place contaminated maf.eria.ls in disfxssable containers and dispose of in a Manner COnsi:stent with apolfcxble rQt+ulations. ContaCt local environmentai or t,valtl� ijuLhordtjP:i '&or approved di:lposal ,7f LtI;s ReviSion Number: 7 Revision Date: 06/07/57 MSOS Numbe 000584 NUh - No Data Available NA - Nes!. Applicable 9. I3,XPOSURS STANDARDS, REGULATORY LIMITS AND COHPOSITION COTKPOSITIO14 COWENT: All the components of this material are on the Toxic Substances Control Act Chemical substances Inventory. The proportion compositio s are given to allow for the various ranges of the components present in the whole n: ;duct and may not equal 100%. 100.0 SULFUR DIOXIDE CON"TAI N I SIG COMMON NAME/ CHEMICAL ttAla PERC.E T ERPOSURE LIMIT AGENCY/TYPE Common Name: SULFUR DIOXIDE Chemical Name: SULFUR DIOXIDE CAS7446095 100.0 5.2 mg/m3 ACGIH TWA 5ppm ACGIR STEL 2ppm OSHA TWA 5ppm OSHA STEP. TPQ=500 LSS SA1IA. 302 RQ=l LES SARA 304 TLV - Threshold Limit 'Value TWA - Time Weighted Average STeL - Short-term Exposure Limit TPQ - Threshold Planning Quantity RQ - Reportable Quantity CPS -- CUSA Product Code CC -- Chevron Chemical. Company CAS - Chemical Abstract Service Number ltd . REGULATORY IN'F'ORMATION DOT SHIPPINGNAME;: NDA 001' HAZARD CLASS, NBA DOT II7WT1FICATION NUMBER: NBA DOT PACKING GROUP: RDA SARA 311 CATEGORIES: 1. Immediate (Acute) Health Effects: YES 2. Delayed {Chronic) Health Effects: NO 3. Fire Hazard: NO 4. Sudden Release of Prvssure Hazard: NO S. Reactivisy Hazard, NO PFC.W.ATORu lr};;TS SEARCHED: 0aE ''SA;\A. a .3 11:sti'i A T K Z I CTSC;� -Sect 4( cl7' }•t:t5 i ':7'}� l t=CEACLA 'v'i.1 /,7TSCA S<vct J{o d M) J .-14V :Rl'k 3-TSCA' Sect 6 !;4A 24=TSCA St:cl, 12(h) Revision Number: 7 Revision irate: 08/07/92 HSUS ,Number. 000584 NDA a NO 03t3 Available 14A - Not APPlicable ... _- ...... .»_..... ..w..r.. r,r+i.w�Lww.v... •�7 -,:77 7-...- ...r`A 0S--CA Prop 65-Repro Tox 15-ACGIH STEL 25-TSCA Sect 40(a) 06-IARC Group 3 16-ACGTH Calculated TLV 26-TSCA Sect 8(d) 07-IARC Group 2A 17 h TWA 28-Canadian WWt£ ,. 08-IARC Group 2H IS 3A STEL 29-0SHA C EILINQ 09zSARA 3021304 19-Chevron' T"WA 30-Chevron STEL 10-PA RTR 20-EPA Carcinogen The following components of this material are found on the regulatory Lists indicated. SULFUR DIOXIDE a is found on lists: 02,05,10.11,13,14,15,17,18,28, Iia TOXICOLOGICAL INFORMATION EYE IRRITATION: No product: toxicology data available SKIN IRRITATION: No product toxicology data available. DEMAL TOXICITY: No product toxicology date available. RES P t RATORY/I h1iALAT i ONt No product toxicology data available. INGESTION No product toxicology data available. 12- ADD I T'I OKAL HEALTIi DATA ADDITIONAL HEALTH DATA COWIENT All available data is expressed elsewhere in this document. �rstatat�teerrrrrtsr�rxie�t*arx**x*<rr,r*#�r�*�rr�r,trr+t�*����xrrirr�x*��t�x*rr��t�rrk#arc*�t�t+t��rr#�+e��� The above information is based on the data of which we are aware and is believed to be correct as of the date hereof. Since this iaforwation may be applied under conditions beyond our control, and with which we may be unfamiliar and since data made mailable subsequent to the date hereof may suggest viodification of the inforzatri©n. we do not assume any resp'onsibil- itp for the results of its use. This information is furnished upon condition that the person receiving it shall make his own det:ermiaaRtion of the suitability of the material for his particular purpose. Revision Number: 7 Prevision Date: 08/07/92 H50S Number 000584 NDA - No Dass Available HA - Not Applicable Title 19 Otflce of Emergency Sergi §2705 EMERGENCY RET,EASE FOLLOW-UP NOTICE REPORMG FORM wars xaa4a r ear+t k titatra tnra�axa A Chevsm Pfodnicu Compw)y,Richmond Refinery Rcirincry Shift Coordiwwr-510-242-2772 t M W-T MC DAYYfi Brnccicl Des 0 3 2 5 l 9 91 4 3 5 cu" 0044►inw) colrtrtcwNo. 9 9 1 3 6 1 ,DM"S CrrY tUM" MUM z c "I CIZV on Way Richmond Contra Com 94902 Qt><it AL nit «W) t:nt ttawav Sulfur Dioxide(SOZ) 7446-09-3 9 39tac 7 043351 is USED 5 OWK F WaXASE1 ars Wf,,&Rya Uxearlat'; t>bC 19So XP tCt X VNMA 42 Vsr_/ow'(r) INYSK:ALSTAMCOWAtit �UYSleAt 5rAlEn �+ QUAt1TfrYk 3FA 0 LLQk s 61 OAS wren E3 i1quio 0 GM 18,000 lbs ErtVtAow rerwt rAMiuXr�ls TLNM of 0VU110N OP RVIATE �AM []WATM ©GROUND 00THU � 14:23 0 DAYS ( Hou" 7 M24rW . .ONS"r —41 See tltiu enclosed addendum to this fonm f t.NOWN OX ARTItWAYM Z; l°ii FSPECTS M-the Wi*ft for MrWW irforrwadon) ! Aa=m tt rAiti o n) Based ou nwnitoxir4 data,imunfate health cffecm,if any,would be ndniml. P �] amoMir nit na Ayw(.,ow) We do nt�co c ce any chronic or delayed health effacm t`mm his release. rttrr owri t� ) -- AMR immxmZ oww.Aj.Arm"oY RZODA im b:Kl°05w;raRlDtlAToS See atuicht d MSDS. When the event occtutvd,all 3t#employees who work in die arca near the lire were accounted for ' without injuty. Two Chevron)firefighters,who sustained mittor Wuries while res rdin Ea the evcnr,were it sported to a!neral hospital where they were treaUd and released. OZ—W a ;AM Sege_, tp AND MW waft ou ArYrKt VWAL>T MK MA7tau t Chevron activated:a full emergency reaponae when the event occurred,including respo=from Chevron's Fire Int.and coils for assistance from the Richmond Fire DW and six other response organizations. Notifications ureter made to the H h'atiorttai Response center(NRC),the State Office of'Etwgency Services(SOES),and the.Bay Area Air Quality Mgmt. District(BAAQA+ID) Chmon mceivod and responded to public and media aurdion. `Chc Chevron Ger"de St.Weather Station shows winds predominantly out of the WSW from 14-00 to 211.00 at in average windspced ofrexi.matoly 9 mrh. CMZttWAT[W, t t.ealy W*tlh&w POWtY e{kW i%0 i b x prromAly es.+afnod add t ren f am] M Wft rife wraniation u10�Ct+o a Nae wive d cde,�+�adae to 4v4 Wowo 1.lid 6mnom. 1 �tbXcvirr srtrrrwtz cP<,�a.r ► M.A.Gilles SLONATVKEOFX"OkGFACrurvXrP EWXTATM 0AM 3129199 Pry lig ieyi,ler D0,Na1 dl�y 1147 EWRGENC'Y RELEASE FOLLOW-UP NOTMCATIOfN FORM ADDENDUM S1;CTION E—ACTIONS TAKEN: At 14:2$, on March 2S, 1999, a leak developed in the piping system in the fsomax Unit. Operating crews sounded the local plant evacuation alarm system and.notified Chevron's emergency response team. A hydrofined gas oil release detonated resulting in a fire which produced a visible smoke plume. The Ysomax and edjacect unit_c were: shut down and depressured as designed through their individual safety flare system. As a result of the fire and flaring, sulfur compounds present in the refinery sura ns were combusted thereby farming sulfur dioxide(SO2). At approximately 14:35, the Contra Costa County Health Services Rept. (HSD) was notified and a notice was issued by HSD for the neighboring community to shelter-in- place. Chevron personnel and IPSO sampled the perimeter of the facility and the neighboring community in locations as far as the Berkeley Hills using portable analyzers and found no measurable quantities of sulfur dioxide (SO2) or hydrogen sulfide (H2.S). Continuous monitoring by five perimeter Ground Level Monitors (OLM's) showed trace quantities of SO2 and f12S at only one location for a limited time at the beginning of the event. The GLM peaked at 14:37 and showed 0.025 ppm. of SO2 and 18 ppb of K2S, which are both below Bay Area Air Quality Management District (BAAQMD) violation levels. The levels then declined continuously to background levels within 30 minutes. A crass-functional team is conducting a full investigation. Chevron is also fully cooperating with-separate agency investigations.