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Exhibit V'1.'-4 can be used as a screening tool to help you assess the <br /> general effectiveness of air sparging for a given site it provides boiling <br /> point ranges for the petroleum products typically encountered at. UST <br /> sites as a rough gauge for vapor/dissolved phase partitioning Tlie higher <br /> boiling point products contain more constituents of higher volatility (but <br /> not necessarily lower- solubility) which generally results in greater <br /> partitioning to the vapor phase from the dissolved phase Exhibit VII-4 <br /> also provides the range of mtnnsic pc--meabil.ities for soil types typ,.caUy <br /> encountered at LIST sites <br /> Exhibit VII- <br /> Indial Screening For Air Sparging Effectiveness <br /> Permeability of Soil <br /> EneffectmeModerate to Minimal_ Effe&bve <br /> " Effectrveness <br /> lntnnsic nermeabrlity, k (CM2) <br /> 10-73 10_14 10-12 10-1a 10-'a 10-4 10-; 10-2 <br /> C1av <br /> r,acial Till <br /> ,_ Sart Loess <br /> Srrty_Sand <br /> . I Clean Sond -- <br /> Gravel <br /> Vcpor/Disscivec Phcse Pcrti icning <br /> lneffecirve Moderate to Minimal Effective <br /> Effectiveness <br /> Boiling Point CC) <br /> Norrvclatle 300 250 200 100 <br /> C Lube Oils <br /> Heating Ods <br /> Diesel <br /> Kerosene <br /> Gasoline <br /> • <br /> October 1994 VII-7 <br />