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Exhibit VII-7 <br /> Petroleum Product Boiling Point Ranges <br /> Product ladling Point Range (°C) <br /> Gasoline 40 to 225 <br /> Kerosene 180 to 300 <br /> Diesel fuel 204 to 338 <br /> Heating ori > 275 <br /> Lubricating oils Nonvolatile <br /> a general, constituents in petroleum products with boiling points less <br /> t:Ia.-n i50'C to 3G0°C are sufficiently volatile for removal from the <br /> saturated zone by air sparging Nearly all gasoline constituents and a <br /> Portion of kerosene and diesel fuel constituents can be removed from the <br /> szt xated zone by air sparging Heating and lubricating oils cannot be <br /> removed by air sparging However, air sparging can promote biodegrada- <br /> tion of seinivolatile and racrivolat;2e constituents (see Chapter VIII. <br /> Mics.argmg). <br /> Vapor pressure ,s ,ancther meats by w1uch Cie velat hty of a <br /> constituent can Le determinied and used as a gauge for vapor/dissolved <br /> phase parattoning. The vapor pressure of a chemical is a measure of its <br /> tendency to evaporate More precisely, it is the pressure that a vapor <br /> ere:is whenn m egLuhbnu_rn with its pure hq ud or solid form <br /> Constituents with h4aer vapor pressures are generally transferred 570M <br /> the disscl-red phase to the vapor phase more easily Those constituents <br /> with vapor pressures higher than 0 5 mm. Hg are considered to be <br /> amenable to air sparging Exhibit`fI-8 presents vapor pressures of some <br /> common petroleum constituents <br /> Exhibit VII-8 <br /> Vapor Pressures Of Common Petroleum Constituents <br /> Vapor Pressure <br /> Constituent {mm Hg at 20°C} <br /> Methyl t-butyl ether 245 <br /> Benzene 76 <br /> Toluene 22 <br /> Ethylene dibromide 11 <br /> Ethylbenzene 7 <br /> Xylenes 6 <br /> Naphthalene 05 <br /> Tetraethyl lead 0 2 <br /> VIII-10 Oetubcr 1994 <br />