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· CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper not available or no answer, refer to appropriate telephone number listed on the inside back cover.

· ELIMINATE all ignition sources (no smoking, flares, sparks or flames) from immediate area.

EYES: First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop.

General First Aid:

· Wear positive pressure self-contained breathing apparatus (SCBA).

500.0 [ppm]

WATER MAY BE INEFFECTIVE.

If material on fire or involved in fire: Do not extinguish fire unless flow can be stopped or safely confined. Use water in flooding quantities as fog. Use foam, dry chemical, or carbon dioxide. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible. Keep run-off water out of sewers and water sources.

IN GENERAL, MATERIALS WHICH ARE TOXIC AS STORED OR WHICH CAN DECOMP INTO TOXIC COMPONENTS...SHOULD BE STORED IN COOL, WELL VENTILATED PLACE, OUT OF DIRECT RAYS OF SUN, AWAY FROM AREAS OF HIGH FIRE HAZARD, AND SHOULD BE PERIODICALLY INSPECTED & MONITORED. INCOMPATIBLE MATERIALS SHOULD BE ISOLATED...

SRP: At the time of review, criteria for land treatment or burial (sanitary landfill) disposal practices are subject to significant revision. Prior to implementing land disposal of waste residue (including waste sludge), consult with environmental regulatory agencies for guidance on acceptable disposal practices.

SRP: Local exhaust ventilation should be applied wherever there is an incidence of point source emissions or dispersion of regulated contaminants in the work area. Ventilation control of the contaminant as close to its point of generation is both the most economical and safest method to minimize personnel exposure to airborne contaminants.

If material not on fire and not involved in fire: Keep sparks, flames, and other source of ignition away. Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Attempt to stop leak if without undue personnel hazard.

Personnel protection: Keep upwind. Avoid breathing vapors.

Excerpt from ERG Guide 128 [Flammable Liquids (Water-Immiscible)]:

Immediate precautionary measure

500.0 [ppm]

1000.0 [ppm]

Methylcyclopentane was detected in the expired air from 4 out of 8 subjects(all male: 2 smokers and 2 non-smokers) at levels of 0.98 and 0.027 ug/hour for the non-smokers and 11.0 and 0.31 ug/hour for the smokers(1). Methylcyclopentane was detected in the expired air from a control, prediabetic, and diabetic population of 62 non-smokers(2). Methylcyclopentane has been identified in 4 out of 12 human breath samples from subjects in New Jersey (nine people) and in North Carolina (3 people)(3).

TERRESTRIAL FATE: Based on a recommended classification scheme(1), an estimated Koc value of 1600(SRC), determined from an experimental log Kow(2) and a recommended regression-derived equation(3), indicates that methylcyclopentane should have low mobility in soil(SRC). Volatilization of methylcyclopentane may be important from moist soil surfaces(SRC) given an experimental Henry's Law constant of 0.369 atm-cu m/mole(4), and from dry soil surfaces(SRC) based on an experimental vapor pressure of 138 mm Hg(5). Insufficient data are available to determine the rate or importance of biodegradation of methylcyclopentane in soil(SRC).

AQUATIC FATE: An estimated Koc value of 1600(SRC), determined from an experimental log Kow(1) and a recommended regression-derived equation(2), indicates that methylcyclopentane should adsorb to suspended solids and sediment(SRC) in the water(2,SRC). Methylcyclopentane would volatilize from water surfaces(2,SRC) based on an experimental Henry's Law constant of 0.369 atm-cu m/mole(3). Estimated half-lives for a model river and model lake are 2.7 hours and 3.6 days, respectively(2,SRC). An estimated BCF value of 210(2,SRC), from an experimental log Kow(1), suggests that methylcyclopentane will bioconcentrate in aquatic organisms(SRC) according to a recommended classification scheme(4). Insufficient data are available to determine the rate or importance of biodegradation of methylcyclopentane in water(SRC).

ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), methylcyclopentane, which has an experimental vapor pressure of 138 mm Hg at 25 °C(2) will exist primarily in the vapor phase in the ambient atmosphere. Vapor-phase methylcyclopentane is degraded in the atmosphere by reaction with photochemically produced hydroxyl radicals(SRC); the half-life for this reaction in air is estimated to be about 2.3 days(3,SRC). Particulate-phase methylcyclopentane may be physically removed from the air by wet deposition(SRC).

Petroleum distillate poisoning may cause nausea, vomiting, cough, pulmonary irritation progressing to pulmonary edema, bloody sputum, and bronchial pneumonia. At high amounts, central nervous system depression may also occur, with symptoms such as weakness, dizziness, slow and shallow respiration, unconsciousness, and convulsions. Petroleum distillates are also irritating to the skin. (A594)

OTHER EFFLUENTS: Methylcyclopentane was detected during the incineration of plastics(1). Methylcyclopentane was detected in 10 out of 63 industrial effluents (9 samples were less than 10 ug/l and 1 sample was in the range of 10-100 ug/l)(2).

Methylcyclopentane represents 0.8% (by weight) of the hydrocarbons (non-methane organic gases) in engine exhaust, 1.1% for headspace gasoline vapors, and 2.5% for whole gasoline(1). Levels of methylcyclopentane from jet engine exhaust from flight condition simulation experiments using two engine types (YJ93-GE-3 and J85-GE-SB) ranged from 0.06-6.9 ppm C depending on where in the exhaust stream the measurement was taken(2). Average methylcyclopentane concns taken from 8 trips in a car (6 trips in a new car and 2 trips in older cars) and in a commuter train were 5.0 and 0.8 ug/cu m, respectively(3). Exhaust samples from 67 different automobiles with no emission control devices were found to contain an average of 1% wt/wt methylcyclopentane(4). The concn of methylcyclopentane in gasoline vapors from refueling cars at service stations ranged between 0.006 and 0.88 ppm(5). The average percentages of methylcyclopentane in three gasoline vapors are: Amoco Oil (bulk terminal exposure), 1.1 wt%; Amoco Oil (marine loading exposure), 1.5 wt%; and Shell Oil, 1.3 vol%(6). A study conducted in Atlanta (1990) found the average concn of methylcyclopentane in roadway, whole gas (average of six octanes), whole gas (87 octane), whole gas (89 octane), whole gas (92/93 octane), headspace gas (at 24 °C and average of six octanes), headspace gas (at 32 °C and average of six octanes), airport, and aircraft emissions were: 0.783, 1.10, 1.31, 1.04, 0.6, 0.81, 0.86, 0.6, and 0.344 ppbC%, respectively(7).

Methylcyclopentane was detected in the Craebeckx Tunnel (Antwerp, Belgium) in 1991 at concns that were similar for congested (0.049 g/kg carbon and total yearly emissions: 188 tons/year) and non-congested traffic (0.039 g/kg carbon and total yearly emissions: 150 tons/year)(1). A study conducted in Chicago found the average concn of methylcyclopentane in regular fuel (87 octane), mid-grade (89 octane), premium (93 octane), hot soak, cold start, roadway, and petroleum refinery emissions to be 0.98, 0.84, 0.34, 1.17, 1.65, 1.22, and 0.83 wt%, respectively(2). In Southern California, the methylcyclopentane profile for various emissions for vehicle exhaust was 0.92, 1.77, 0.77, 0.00, 0.83, and 0.86 wt% for a 46 car study, 13 samples from the Caldecott Tunnel, cold start, stabilized, hot start, and from an older fleet, respectively(3). Gasoline emission profiles for methylcyclopentane are as follows: 0.69, 1.14, 0.20, 2.44, 2.19, 1.08, and 1.49 wt% for diurnal evaporative emissions (older fleet), hot soak evaporative emissions (older fleet), running loss (older fleet), summer liquid gas, winter liquid gas, summer gas headspace, and winter gas headspace, respectively(3). In oil field emissions (Tulsa, OK), methylcyclopentane was detected at average concn of 164.6 ppbC and approximately 85 ppbC for two different samples(4). A study conducted along US Highway 70 near Raleigh, NC detected methylcyclopentane in automobile emissions at average percents of 1.17, 1.09, 1.13, 1.22, 1.03, and 1.00 %ppbC at five different sites(5). Samples of air taken from the Tingstad Tunnel in Goteborg, Sweden, on five different days, contained methylcyclopentane at 1.6, 1.6, 1.8, 2.0, and 1.9% of non-methane volatile hydrocarbons(6). Methylcyclopentane composition in the vapor of different types of petrol is 2.2 (conventional "cracked" Statoil 95), 2.6 (conventional "reformate" Shell 95), 0.2 (reformulated "alkylate" Aspen 2T), and 0.04% (reformulated "alkylate" OK Special)(7).

The Koc of methylcyclopentane is estimated as approximately 1600(SRC), using an experimental log Kow of 3.37(1) and a regression-derived equation(2,SRC). According to a recommended classification scheme(3), this estimated Koc value suggests that methylcyclopentane should have low mobility in soil(SRC).

Pursuant to section 8(d) of TSCA, EPA promulgated a model Health and Safety Data Reporting Rule. The section 8(d) model rule requires manufacturers, importers, and processors of listed chemical substances and mixtures to submit to EPA copies and lists of unpublished health and safety studies. Methylcyclopentane is included on this list.