ARCO NATURAL GAS MARKETING INC.,  SUBS OF ATLANTIC RICHFIELD -- PLANT RESIDUE GAS, MARSH GAS, NATURAL GAS  -- -
<pre>=====================  Product Identification  =====================

Product ID:PLANT RESIDUE GAS, MARSH GAS, NATURAL GAS
MSDS Date:03/01/1989
FSC:NIIN:Submitter:N EN
Status Code:A
=== Responsible Party ===
Company Name:ARCO NATURAL GAS MARKETING INC.,  SUBS OF ATLANTIC
    RICHFIELD
Address:1601 BRYAN ST
City:DALLAS
State:TX
ZIP:75201
Country:US
Info Phone Num:214-880-4698
Emergency Phone Num:(800)424-9300
Resp. Party Other MSDS Num.:E-0010
Chemtrec Ind/Phone:(800)424-9300
CAGE:9B771
=== Contractor Identification ===
Company Name:ARCO NATURAL GAS MARKETING INC., SUBS OF ATLANTIC
    RICHFIELD
Address:1601 BRYAN ST
Box:City:DALLAS
State:TX
ZIP:75201
Country:US
Phone:214-880-4698
CAGE:9B771

=============  Composition/Information on Ingredients  =============

Ingred Name:METHANE
CAS:74-82-8
RTECS #:PA1490000

Ingred Name:CARBON DIOXIDE
CAS:124-38-9
RTECS #:FF6400000
&gt; Wt:5.
OSHA PEL:10000 PPM
OSHA STEL:30000 PPM
ACGIH TLV:5000
ACGIH STEL:30000

=====================  Hazards Identification  =====================

Routes of Entry: Inhalation:YES  Skin:YES  Ingestion:NO
Reports of Carcinogenicity:NTP:NO    IARC:NO	OSHA:NO
Health Hazards Acute and Chronic:METHANE IS A SIMPLE ASPHYXIANT.
    INHALATION: OXYGEN DEFICIENT ATMOSPHERES MAY PRODUCE RAPID
    BREATHING, HEADACHE, DIZZINESS, VISUAL DISTURBANCES, MUSCULAR
    WEAKNESS, TREMORS,NARCOSIS, UNCONSCIOUSNESS, AN D DEATH, DEPENDING
    ON CONCENTRATION AND DURATION OF EXPOSURE. EYE CONTACT: DIRECT
    CONTACT WITH LIQUID/PRESSURIZED GAS OR FROST PARTICLES MAY PRODUCE
    SEVERE AND POSSIBLY PERMANENT EYE DAMAGE FROM FREEZ E BURNS.  SKIN
    ABSORPTION: THIS MATERIAL IS NOT EXPECTED TO BE ABSORBED THROUGH
    THE SKIN. SKIN IRRITATION: NON IRRITATING, BUT SOLID AND LIQUID
    FORMS OF THIS MATERIAL AND PRESSURIZED GAS CAN CAUSE FRE EZE BURNS.
    (SYMPTOMS OF OVEREXP)
Effects of Overexposure:HEALTH HAZARDS (CONT): AND LIQUID FORMS OF THIS
    MATERIAL AND THE PRESSURIZED GAS CAN CAUSE FREEZE BURNS.  SUMMARY
    OF CHRONIC HAZARDS AND SPECIAL HEALTH EFFECTS: PERSONNEL WITH
    PRE-EXISTING CHRONIC RES PIRATORY DISEASES SHOULD AVOID EXPOSURE TO
    THIS MATERIAL.
Medical Cond Aggravated by Exposure:PERSONNEL WITH PRE-EXISTING CHRONIC
    RESPIRATORY DISEASES SHOULD AVOID EXPOSURE TO THIS MATERIAL.

=======================  First Aid Measures  =======================

First Aid:INHAL: IMMED REMOVE FROM CONTAMD AREA TO FRESH AIR FOR RESP
    DISTRESS GIVE AIR OXYG &/OR ADMIN CPR. PATIENTS SHOULD BE KEPT
    QUIET & WARM UNTIL MED CARE IS OBTAINED. EYE CONTACT: RINSE IMMED
    WITH H*2O.	REMOVE CONTACT LENSES THEN FLUSH EYES WITH H*2O FOR
    10-15 MIN. IF IRRIT OR DISCOMFORT PERSISTS CALL FOR MED ATTN. SKIN
    CNTCT: FROZEN TISS SHOULD BE FLOODED OR SOAKED WITH WARM
    H*2O(105'-115'F). DO NOT  USE HOT H*2O. CRYOGENIC BURNS WHICH
    RESULT IN BLISTERING OR DEEPER TISS FREEZING SHOULD BE PROMPTLY
    SEEN BY A MD. INGEST: RINSE MOUTH WITH H*2O DRINK 1-2 GLASSES OF
    H*2O OR MILK. DO NOT INDUCE VOMIT  UNLESS DIRECT BY MED PERSONNEL.

=====================  Fire Fighting Measures  =====================

Flash Point:=-187.2C, -305.F
ESTIMATED
Autoignition Temp:=498.9C, 930.F
Autoignition Temp Text:ESTIM
Lower Limits:5.0 APROX
Upper Limits:15.0 APROX
Extinguishing Media:DRY CHEMICAL, CO2, HALOGENATED EXTINGUISHING AGENT
Fire Fighting Procedures:GAS FIRES SHOULD NOT BE EXTINGUISHED UNLESS
    THE GAS FLOW CAN BE STOPPED IMMEDIATELY. SHUT OFF GAS SOURCE &
    ALLOW THE FIRE TO BURN ITSELF OUT. IF THE SOURCE CAN'T BE SHUT OFF
    IMMEDIATELY, ALL EQUIP AND	SURFACES EXPOSED TO THE FIRE SHOULD BE
    COOLED WITH H*2O TO PREVENT OVERHEATING, FLASH-BACKS, OR
    (ECOLOGICAL INFO)
Unusual Fire/Explosion Hazard:THIS GAS RELEASES FLAMM VAPORS AT WELL
    BELOW AMBIENT TEMPS & READILY FORMS FLAMM MIXTURES W/ AIR. EXPOSED
    TO AN IGNITION SOURCE, IT WILL BURN IN THE OPEN OR BE EXPLOSIVE IN
    CONFINED SPACES. VAPORS MAY  TRAVEL LONG DISTANCES TO A POINT OF
    IGNITION, & THEN FLASH BACK. ALKANE/CHLORINE GAS MIXTURES HAVE
    PRODUCED EXPLOSIONS.

==================  Accidental Release Measures  ==================

Spill Release Procedures:ELIMINATE ALL POTENTIAL SOURCES OF IGNITION.
    EVACUATE ALL NON-ESSENTIAL PERSONNEL TO AN AREA UPWIND (AT LEAST
    1/2 MILE IN ALL DIRECTIONS IF TANKS OR TANK CARS ARE INVOLVED IN
    FIRE). STOP SOURCE OF REL EASE WITH NON-SPARK TOOLS BEFORE PUTTING
    OUT ANY FIRE. VENT ENCLOSED AREA TO PREVENT FORMATION OF FLAMMABLE
    OR OXYGEN-DEFICNT ATMOSPHERE. WATER SPRAY MAY BE USED TO REDUCE
    VAPORS. (OTHER PRECAUTIONS)

======================	Handling and Storage  ======================

Handling and Storage Precautions:HANDLING: IF UPON INITIAL RECEIPT
    INSPECTION A CYLINDER IS FOUND TO BE IN POOR OPERATING CONDITION,
    CONT THE SUPPLIER. THE MOST COMMON HAZARD IS LEAKAGE DUE TO FAULTY
    PRESSURE CONTROL REGULATORS. LARG E PRESSURE BUILD-UP CAN RESULT IN
    EXPLOSIVE DECOMPRESSION AT THE CYLINDER HEAD CAUSING (OTHER INFO)
Other Precautions:SPILL RELEASE PROC (CONT): LIQUID SPILLS WILL
    VAPORIZE FORMING COLD DENSE VAPOR CLOUDS THAT DON'T READILY
    DISPERSE. AVOID VAPOR CLOUD EVEN WITH PROPER RESPIRATORY EQUIPMENT.
      WASTE DISPOSAL (CONT): O R DISPOSED OF BY BURNING IN A PROPERLY
    DESIGNED FLARE OR INCINERATOR. VENTING OF THE GASES TO THE AT M
    SHOULD BE AVOIDED.

=============  Exposure Controls/Personal Protection  =============

Respiratory Protection:FOR EXCESSIVE GAS CONCENTRATIONS, USE ONLY
    NIOSH-APPROV, SELF CONTAINED BREATHING APPARATUS. PERSONNEL SHOULD
    NOT ENTERAREAS WHERE THE ATMOSPHERE IS BELOW 19.5 VOL % OXYGEN
    WITHOUT SPECIAL PROCEDURES	/ EQUIPMENT. RESPIRATOR USE SHOULD
    COMPLY WITH OSHA 29 CFR 1910.134 OR EQUIVALENT.
Ventilation:LOCAL EXHAUST & GENERAL VENT MAY BOTH BE ESSENTIAL TO
    PREVENT ACCUM OF EXPLOSIVE MIXTURES. IF MECHANICAL VENT IS USED,
    ELECTRICAL EQUIP MUST MEET NEC RQMNTS.
Protective Gloves:INSULATED, IMPERVIOUS PLASTIC OR NEOPRENE-COATED
    CANVAS GLOVES
Eye Protection:USE CHEMICAL TYPE GOGGLES (ANSI APPROVED - ) AND FACE
    SHIELD (SUPP S & H)
Other Protective Equipment:EMERGENCY EYEWASH FOUNTAINS AND SAFETY
    SHOWERS FOR FIRST AID TREATMENT OF POTENTIAL FREEZE BURNS SHOULD BE
    AVAILABLE IN THE VICINITY OF ANY SIGNIFICANT EXPOSURE FROM
    COMPRESSED GAS RELEASE.
Work Hygienic Practices:PREVENT POTENTIAL SKIN CONTACT WITH COLD LIQUID
    / SOLID / VAPORS. USE INSUL, IMPERV PLASTIC OR NEOPRENE-COATED
    CANVAS GLOVES & PROT GEAR (APRON, FACE SHIELD, ETC.) TO PROTECT
    HANDS AND OTHER SKIN AREAS
Supplemental Safety and Health
EYE PROT (CONT): WHEN HANDLING LIQUIFIED GASSES. SAFETY GLASSES (ANSI
    APPROVED - ) AND/OR FACE SHIELD ARE RECOMMENDED WHEN HANDLING
    HIGH-PRESSURE CYLINDERS AND PIPING SYSTEMS AND WHENEVER VAPORS A RE
    DISCHARGED.

==================  Physical/Chemical Properties  ==================

Boiling Pt:=-161.1C, -258.F
B.P. Text:APPROXIMATE
Melt/Freeze Pt:=-182.2C, -296.F
M.P/F.P Text:APPROXIMATE
Vapor Pres:NO DATA AVAILABLE
Vapor Density:0.5 APPROX
Spec Gravity:< 0.30 @ 39.2F
Solubility in Water:NEGLIGIBLE
Appearance and Odor:COLORLESS, TASTELESS, ODORLESS GAS. (ODOR IS
    INADEQUATE WARNING)

=================  Stability and Reactivity Data  =================

Stability Indicator/Materials to Avoid:YES
OXIDIZING AGENTS SUCH AS OXYGEN, CHLORINE, FLUORINE/FLUORIDE COMPOUNDS,
    BROMINE & METAL CATALYSTS.
Stability Condition to Avoid:HEAT, SPARKS AND OPEN FLAMES.
Hazardous Decomposition Products:INCOMPLETE COMBUSTION MAY PRODUCE
    CARBON MONOXIDE & OTHER HARMFUL SUBSTANCES.

===================  Toxicological Information	===================

Toxicological Information:N/P.	HANDLING & STORAGE PREC (CONT): THE
    CYLINDER TO ROCKET LIKE A MISSILE. USE PRESSURE-REDUCING REGULATOR
    WHEN CONNECTING TO LOWER PRESSURE PIPING SYSTEMS. PREVENT
    ENTRAPMENT OF LIQUID IN CLOSED SY STEMS. USE CHECK VALVE TO PREVENT
    BACK-FLOW INTO STORAGE CONTAINER. CHAIN CYLINDER WHEN NOT IN USE. 
    GENERAL COMMENTS: STORE & USE GAS CONTAIN ONLY IN WELL-VENT AREAS.
    STORAGE AREAS SHOULD NOT EXCEED  100F & SHOULD BE PROTECTED FROM
    DAMPNESS, SALT & CORROSIVE CHEMICALS. CYLINDER STORAGE SHOULD BE
    SEGREGATED FROM OXIDIZERS SUCH AS OXYGEN, CHLORINE, ETC. & AWAY FRM
    HEAVY TRAFFIC AREAS TO PREVENT KNOC KING OVER OR DAMAGE (ECOLOGICAL
    INFO)

=====================  Ecological Information  =====================

Ecological:N/P.  FIRE FIGHT PROC (CONT): EXPLOSIONS. CONTROL FIRE UNTIL
    GAS SUPPLY CAN BE SHUT OFF. FIREMEN MUST USE PROPER PROTECTIVE
    EQUIPMENT INCLUDING RESPIRATORY APPARATUS TO PROTECT AGAINST
    HAZARDOUS COMBU STION PRODUCT / OXYGEN DEFICIENCIES.  TOX INFO
    (CONT): OF FALLING OBJECTS. AVOID DRAGGING, ROLLING, OR SLIDING
    CYLINDERS. VALVE CAPS SHOULD REMAIN ON CYLINDERS NOT CONNECTED FOR
    USE. SEPARATE FULL CON TAINERS FROM EMPTY ONES. ODOR IS NOT AN
    ADEQUATE WARNING OF POTENTIALLY HAZARDOUS CONCENTRATIONS IN AIR.
    FOR AN EXPLANATION OF OCCUPATIONAL EXPOSURE LIMITS REFER TO THE
    DEFINITION OF "SIMPLE ASPHYXIAN T" PRESENTED IN THE ACGIH (TRANS
    INFO)

====================  Disposal Considerations  ====================

Waste Disposal Methods:RELEASES ARE EXPECTED TO CAUSE ONLY LOCALIZED
    NON-PERSISTANT ENVIRONMENTAL DAMAGE. WASTE MIXT CONT THESE GASES
    SHOULD NOT BE ALLOWED TO ENTER DRAINS OR SEWERS WHERE THERE IS
    DANGER OF THEIR VAP BEING  IGNITED. WHEN IT BECOMES NECESSARY TO
    DISPOSE OF THESE GASES, IT IS PREF TO DO SO AS A VAP THESE GAS ES
    MAY BE USED AS AN AUXILIARY FUEL (OTHER PRECS)

===================  MSDS Transport Information  ===================

Transport Information:DOT HAZARDOUS MATERIALS PROPER SHIPPING NAME:
    METHANE.  DOT HAZARD CLASS: FLAMMABLE GAS.	UN/NA ID NO: UN 1971. 
    ECOLOGICAL INFO (CONT): TLV BOOKLET. RELEASES OF THESE GASSES MAY
    CAUSE FLAMMABLE ATMOS PHERE WITH EXPLOSION POTENTIAL. THESE
    ATMOSPHERES MAY ALSO BE OXYGEN DEFICIENT. DO NOT ENTER SUCH AREAS /
    CONFINED SPACESWITHOUT IMPLEMENTING SPECIAL SAFETY PROCEDURES,
    INCLUDING MONITORING FOR OXYGEN  DEFICIENCY AND FLAMMABLES. THE
    INFORMATION AND CONCLUSIONS HEREIN REFLRCT NORMAL OPERATING
    CONDITIONS AND MAY BE FROM SOURCES OTHER THAN DIRECT TEST DATA ON
    THE MIXTURE ITSELF.

=====================  Regulatory Information  =====================

SARA Title III Information:N/P.  OTHER INFO (CONT): POINT INTENSIFIES
    PRESSURE AND RAPID DIFFUSION HAZARD. MAY CAUSE FROSTBITE OR FREEZE
    BURNS! AVOID EXPOSURE TO LIQUID OR CRYOGENIC GAS VAPOR. 
    SUPPLEMENTAL: INDUSTRY EXPERIENCE  HAS SHOWN THAT THIS MATERIAL MAY
    CONTAIN SMALL AMOUNTS OF RADON, A NATURALLY OCCURING RADIOACTIVE
    GAS, AND ITS PARTICULATE DECAY PRODUCTS, SOME OF WHICH MAY BE
    RETAINED IN PROCESS EQUIPMENT. GAMMA RA DIATION ABOVE BACKGROUND
    LEVELS, EMITTED FROM SHORT HALF-LIFE DECAY PRODUCTS, MAY BE
    DETECTED EXTERNALLY AT THAT EQUIPMENT DURING OPERATIONS BUT WILL
    DECAY TO BACKGROUND LEVELS WITHIN 4 HOURS AFTER CE SSATION OF FLOW.
    (FED REGS)
Federal Regulatory Information:N/P.  SARA III (CONT): EQUIPMENT
    EMITTING GAMMA RADIATION SHOULD BE PRESUMED TO BE INTERNALLY
    CONTAMINATED WITH LONGER-LIFE DECAY PRODUCTS THAT EMIT ALPHA
    RADIATION, WHICH MAY BE A HAZARD IF INHALED.   IF YOUR ASSESSMENT
    INDICATES THE PRESENCE OF GAMMA RADIATION, EMPLOYEE EXPOSURE
    POTENTIAL SHOULD BE MINIMIZED BY LIMITING ACCESS NEAR THAT
    EQUIPMENT. PRIOR TO MAINTENANCE ON THOSE EQUIPMENT INTERNALS , STOP
    FLOW AND ALLOW A 4 HOUR DELAY PRIOR TO OPENING. MAINTENANCE
    PERSONNEL SHOULD WEAR APPROPRIATE  PROTECTIVE EQUIPMENT TO PREVENT
    SKIN CONTAMINATION OR INHALATION OF ANY RESIDUE CONTAINING ALPHA
    RADIATION.

=======================  Other Information  =======================

 Disclaimer (provided with this information by the compiling agencies):
 This information is formulated for use by elements of the Department
 of Defense.  The United States of America in no manner whatsoever,
 expressly or implied, warrants this information to be accurate and
 disclaims all liability for its use.  Any person utilizing this
 document should seek competent professional advice to verify and
 assume responsibility for the suitability of this information to their
 particular situation.