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