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CALCULATIONS To calculate the pounds (lb) per day the concentration is multiplied by the volume of air produced in one day The lab reports the Concentrations (C) of the air sampling in ug/liter The first step is to convert this value to lbs/cf (pounds per cubic foot) lug/l x 0 000001g/ug x 0 002205lb/g x 28 321/cf = 0 0000000621lb/cf The volume of air produced in one day, equals the floc: rate (Q) x the time of flow V = Q x T = cf/day = cf/min x 1440min/day The volume must be corrected to standard temperature and pressure (STP) P = Pressure = 14 7 lb/int @ STP r V = Volume cf T = Temperature in degrees above absolute Zero = 491 580R @ STP Using the Ideal Gas Law P1V1/T1 = P2V2/T2 Solving for V2 =PZV1T2/22T1 Assuming P1 = P2 = 14 7 lb/int , P cancels from the equation leaving V2 = V1T2/Tl V1 = Q cf/m x 1440 min/day T2 = 491 58oR T1 = 459 58 + ToF at sight V2 = Q cf/min x 1440 min/day x 491 58oR/ (459 580 + ToF) X lb/day = C ug/l x 0 0000000621 lb 1/ug cf x Q cf/min x 1440 min/day x 491 580R/ (459 580 + ToF) Q for the Influent sample = The well flow rate + the air flow Q for the Effluent = The well. flow + the air flow + the fuel flow rate The fuel flow rate must be corrected to account for the change in volume from combustion Since the gas volume depends on the number of molecules present the reaction of propane with oxygen produces an increase in volume The reaction, 1C3H8 + 502 -> 3CO2 + 4H2O, increases the number of molecules from 6 to 7 per molecule of propane This effectively means that after combustion the volume of flow resulting from the propane is double the propane flow rate The reactann of methane (Natural Gas) and oxygen does not produce a net change in volume, CH4 + 2 02 -> CO2 + 2 H2O, therefore a correction for combustion does not need to be made when methane is burned page 5 of R603 , 08/12/94