Laserfiche WebLink
CLEARWATER <br /> C R O U P, I ISI C. <br /> • Vacuums at the test well. <br /> • Vacuums in surrounding monitoring points. <br /> • Flow rates at the test well. <br /> • Concentrations of volatiles in influent and effluent air streams. <br /> • Per cent LEL and oxygen in influent air streams. <br /> Soil. VaI26r Extraction Test E ui ment <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 ngine 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 /> 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 picot 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. Maa ehelicT`4 gauge. An Alpha OneT`'I, 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 /> hydrocarbons 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 3 October 4, 1994 <br />