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CLEAIRWATER <br /> G R O U P, I N C. <br /> Vacuums at the test well. <br />' Vacuums in surrounding monitoring points. e <br /> • Flow rates at the test.well. {,,,, JY 2 <br /> U, <br />' U <br /> • Concentrations of volatiles in influent and effluent air streams. <br />' Per cent LEL and oxygen.in influent air streams. <br />' Soil Vapor Extraction Test E ui meant <br /> The vacuum source will be either an internal combustion engine (IC engine) with <br /> attached blower, or a 3/4 horsepower regenerative blower. The IC engine is <br /> preferred for pilot tests due- to the higher range of vacuums and flows that can be <br />' obtained, allowing a more realistic determination of the air flow conditions in the <br /> subsurface without the possible influence of equipment limitations. Several <br /> manufacturers supply specially modified IC engines for the purpose of performing <br /> OP vapor extraction tests. The IC engine with attached catalytic converter treats vapors <br /> prior to emission to the atmosphere. If a regenerative blower is used, on-site <br /> electricity or a generator are used as a power source. Carbon canisters can be attached <br />' to the regenerative blower to treat vapor emissions if necessary. <br /> MagnehelicTM gauges attached to the test well and individual monitoring points are <br /> used to measure vacuum. A thermal anemometer, or a pitot tube, inserted into a <br /> manifold attached to the test well, is used to measure vapor extraction flow rates. If <br /> the vacuum is below 10 inches of water column, a thermal anemometer is used. If <br /> the vacuum is greater than 10 inches of water column, the flow rate will be <br /> measured using a pitot tube and MagnehelicTM gauge. An Alpha OneTM, or <br /> equivalent, air sampling pump is used to collect influent vapor samples into one <br /> liter TedlarTM bags from the manifold sampling port. If necessary, effluent air <br /> samples are also collected into one liter TedlarTM bags. A photo-ionization detector <br /> is used to measure volatile hydrocarbon concentrations in collected air samples. An <br /> LEL/oxygen meter is used to measure percent LEL and percent oxygen in collected <br /> influent air samples. One influent sample, and if necessary, one effluent sample, <br /> will be analyzed at a State-certified environmental laboratory for total petroleum <br /> Ihydrocarbons as gasoline according to EPA Method 8015 and for benzene, toluene, <br /> ethylbenzene and xylenes (BTEX) according to EPA Method 8020. Additional <br /> analyses will be performed as required by the permit or specific project <br /> Soil Vapor Extraction Test Protocols Page 2 of 5 December 16,1994 <br />