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P <br /> BCR & Associates, Ltd. Re, of 12193 <br /> Standard Procedure 12 <br /> Pilot Testing Monitoring Wells For Soil Vapor Extraction Capability <br /> PILOT TEST SETUP <br /> t <br /> The vapor extraction well will be connected to the inlet side of the blower through <br /> two-inch inside diameter PVC pipe and connecting hardware. Where the test well <br /> is another size, the well will be reduced to two-inch through reducing coupling PVC <br /> fittings. The exhaust from the blower will be connected to the exhaust stack <br /> through two-inch I.D. PVC pipe and connecting hardware. The exhaust stack will <br /> be constructed of two-inch PVC pipe and will exhaust the effluent no less than 14 <br /> feet above ground level. <br /> A recirculation valve or a dilution will be installed between the intake and the <br /> r exhaust ports of the blower so that the flow rates can be varied. <br /> Monitoring ports will be installed at the inlet and exhaust of the blower. <br /> . PILOT TEST PROCEDURES: <br /> r ' <br /> The pilot test will be conducted in three segments. <br /> Air-Flow Operation and Generation of a Blower Curve <br /> 0 The test will be begun with an air flow of 25 cfm and increase incrementally at <br /> intervals of 25 cfm until maximum air flow is obtained. At each 25 cfm interval, <br /> vacuum, volatile organic compounds (VOC) concentrations and radius of influence <br /> will be measured. The data collected in this segment will be used to construct an <br /> air flow (blower) curve. The blower curve is a tool to facilitate design <br /> 0 specifications for a remediation system. <br /> 1 .) The blower curve will indicate the optimum air flow to vacuum ratio. This is <br /> for situations where there are factors limiting the air flow from the source, <br /> such as limited screened intervals or tight soils. The air flow will be <br /> increased with a corresponding increase in vacuum applied up to a point <br /> where the air flow will cease to increase even though the vacuum continues <br /> to increase. This break-over point indicates where it is not efficient to <br /> attempt the high end air flows because of the high amount of energy <br /> required to maintain high vacuums. <br />!� 2.) In situations where there are no air flow limitations recognized during the <br /> test, the air flow will increase with increased vacuum until the blower <br /> r <br />