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CALCULATIONS <br /> To calculate the pounds (lb) per day the concentration is <br /> multiplied by the volume of air produced in one day. <br /> The lab reports the Concentrations (C) of the air sampling in <br /> ug/liter. The first step is to convert this value to lbs/cf <br /> (pounds per cubic foot) . <br /> 1 ug/l x 0 000001g/ug x 0 0022051g/g x 28 . 321/cf = <br /> 0 . 0000000621lb/cf <br /> The volume of air produced in one day, equals the flow rate (Q) x <br /> the time of flow. <br /> V = Q x T = cf/day = cf/min x 1440mzn/day <br /> The volume must be corrected to standard temperature and <br /> pressure (STP) . <br /> P = Pressure = 14 . 7 lb/in2 Q STP <br /> V = Volume cf <br /> T = Temperature in degrees above absolute Zero = 491 . 580R @ STP. <br /> Using the Ideal Gas Law P1V1/T1 = P2V2/T2 <br /> Solving for V2 =P1V1T2/P2TI <br /> Assuming P1 = P2 = 14 7 lb/in2 , P cancels from the equation <br /> leaving V2 = V1T2/T1 . <br /> V1 = Q cf/m x 1440 min/day <br /> T2 = 491 . 580R T1 = 459 58 + TOF at sight <br /> V2 = Q cf/min x 1440 min/day x 491 580R/ (459 580 + T°F) <br /> X lb/day = C ug/1 x 0 0000000621 lb 1/ug cf x Q cf/min x 1440 <br /> min/day x 491 . 580R/ (459 580 + T°F) <br /> Q for the Influent and Effluent samples = The well flow rate + <br /> the air flow. <br /> VAPOR RECOVERY RESULTS <br /> As of November 30, 1993 , the total system has recovered a <br /> calculated total of 18006 pounds of hydrocarbons, 4987 of wHich <br /> have been produced since the beginning of operations under the <br /> Authority to Construct <br /> As of July 21, 1992, the date it was destroyed, P1 had produced <br /> 2 96 pounds of hydrocarbons or an additional 1 63 pounds since <br /> the beginning of operation under the Authority to Construct See <br /> Table 1 . <br /> page 4 of R604, 12/16/93 <br />