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3 Air flow velocity (record the mean velocity for 30 seconds) The air flow velocity <br />' will be used to calculate the volume of influent and effluent air The effluent air <br /> volume should be equal to or greater than the influent air volume If it is not, the <br /> system will be checked for blocked air pathways If air flow volume cannot be <br /> corrected, the system will be shut down and inspected <br /> 4 Offgas sampling and analyses with only the fresh air pipe open <br /> 5 Vacuum in the UVB well with the fresh air inlet blocked (the negative pressure <br /> 1 should increase if the seal is good) (optional) <br /> 4.2.1.2 Influent Vapor <br /> All parameters listed below will be measured from the top of the UVB influent pipe <br />' 1 Ambient relative humidity (optional) <br /> 2 Ambient air temperature (optional) <br />' 3 Air flow velocity (record the mean velocity for 30 seconds) Air influent should <br /> match the startup velocity�20% To adjust velocity, ballasts will be added or <br /> subtracted from the inlet air pipe <br /> 4 Vacuum gauge on the UVB well flange (negative pressure) with fresh air pipe open, <br /> and then covered (the negative pressure should increase with a covered air pipe, if <br /> the seal is good) <br />' 5 If the vacuum (negative pressure) does not increase with a covered air pipe <br /> A The well flange will be checked and any air leaks will be sealed <br /> B If vacuum does still not increase with the fresh air pipe closed, a detailed <br />' system troubleshooting will be performed <br /> From the stated data, using a time-weighted measurement of total volatiles per day in ,ug/L, the <br />' amount of hydrocarbons extracted by the remediation system in pounds per day will be calculated <br /> and graphically represented as pounds per day versus operating time <br /> 4.2.2 Groundwater Parameters Measured from UVB Observation Wells <br /> The following parameters are measured in-situ for all selected existing monitoring wells and the <br /> two additional monitoring wells (UVBMW 1, UVBMW 2) that will be constructed to monitor <br /> the UVB system <br /> I pH (down-hole probe) <br />' WP61 73942 WPI096 TX 5 8 <br />