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APPENDIX A-2 HAZARDOUS PROPERTY INFORMATION Explanations and Footnotes A Water solubility is expressed in different terms in different references. Many references use the term"insoluble" for materials that will not readily raiz with water,such as gasoline. However,most of these materials are water soluble at the part per million or part per billion level. Gasoline, for example, is insoluble in the gross sense, and will be found as a discrete layer on top of the ground water. But certain gasoline constituents,such as benzene, toluene, and xylene will also be found in solution in the ground water at the part per trillion or part per billion level. Water solubility expressed as 0.2 g means 0.2 grams per 100 grams of water at 200 G B. Solubility of metals depends on the compound in which they are present C. Specific gojn is the ratio of the density of a substance to the density of a reference substance. For solids and liquids the reference substance is water, and for gases the reference substance is air. Specific gravity is expressed in units of g/ca(for solids and liquids)or gp(at 0 C and 760 mm for gases) D. Vapor density is the weightlunit volume expresses as grams/cubic centimeter liquids. E. Flash point is the temperature at which a liquid or volatile solid gives off vapor sufficient to form an ignitable mixture with the air. Flash points may be determined by.the open cup method or closed cup method. Several chlonaated hydrocarbons exhibit no flash point in the conventional sense, but will burn in the presence of high energy ignition source or will form explosive mixtures at temperatures above 200°F. F. Va=pressure is the pressure at any given temperature of a vapor in equilibrium with its liquid or solid form. It is expressed as mm Hg under standard conditions. G. Lower explosive limit L and Upper MMlosive limit L are the minimum and maximum concentrations of a gas or vapor which will support flame. LEL and UEL are expressed in % in air at ambient or room temperature. No-Flam=Practically non-flammable under standard conditions. H, Explosive concentrations of airborne dust can occur in confined areas. L LDSO is the quantity of a substance administered by inhalation that is necessary to kill 50% of the test animals exposed to it within a specified time. 3 Threshold limit value on a time weighted average(MV--TWA)is the concentration for a normal 8-hr workday and 40-hr work week, to which nearly all workers may be repeatedly exposed, day after day, without adverse effect Values reported are the lower of either Threshold Limit Value-Time Weighted Average (TLV-TWA), OSHA Permissible Exposure Limits or the National institute of Occupational Safety and Health (NIOSH)Recommended Exposure limits. SB SP-92-IIIPETRO PAGE 16