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Y <br /> f <br /> Abbreviations <br /> ARB - Air Resources Board <br /> a <br /> ARS - automatic recovery system <br /> BTEX - benzene,`toluene, ethylbenzene, x}Iene <br /> cfm - cubic feet per minute <br /> cp - centipoise <br /> d - darcy <br /> EPA - Environmental Protection Agency <br /> ERI - effective radius of influence <br /> fbg - feet below grade <br /> ft/min - feet per minute <br /> ft/day - feet per day <br /> ft2/min - square feet per minute <br /> ft'/day - square feet per day <br /> gpm - gallons per minute <br /> h - height of screen interval or vadose zone thickness <br /> in H2O - inches of water <br /> k - soil permeability to air <br /> NA - not available <br /> ND - not detected above detection limit <br /> ppm - parts per million <br /> psi - pounds per square inch <br /> psia - pounds per square inch absolute <br /> Q - air flow rate <br /> r - distance from extraction well or between observation wells <br /> VES - vapor extraction system <br /> VFH - volatile fuel hydrocarbons <br /> µ - air viscosity <br />• <br /> A-3 <br />