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AIR SPARGING/SOIL VAPOR EXTRACTION PILOT TEST <br /> r <br /> The purpose of the air sparging (AS) and soil vapor extraction (SVE) pilot tests is to <br /> collect data necessary to evaluate the performance and determine the effectiveness of, and design <br /> parameters for, an AS/SVE system. The procedures for conducting the pilot tests, as well as <br /> the data to be collected during the tests, are described below. <br /> f <br /> Emf. <br /> ei <br /> ' Preparation of necessary field equipment and personnel for pilot testing Coordinating <br /> Brown and Caldwell and subconsultants. <br /> Day Qne <br /> 1. Collect background readings of dissolved oxygen, and water levels in the <br /> groundwater monitoring wells - <br /> 2. Perform initial SVE test on the test well to determine vacuum and flow rate <br /> performance curve. Check surrounding morutoring wells, or points, for similar <br /> parameters. Collect total petroleum hydrocarbon data during testing with flame <br /> ionization detector (FID) or photo-ionization detector (PID)and collect tedlar bag <br /> samples for laboratory analysis. This procedure is better defined in Brown and <br /> Caldwell's Standard Procedure for Soil Vapor Extraction Pilot Test. <br /> 3. Begin 4-hour AS test on test well. A mixture of 25 percent of helium in air as <br /> a tracer gas will be used when performing the sparge test. Existing monitoring <br /> wells and SVE wells (if applicable) will be used as observation wells during the <br /> AS tests. At a minimum, three wells (if available) will be modified with <br /> necessary piping to collect the sparge off-gas below the water table. A helium <br /> detector will be used to monitor the presence of helium in the sparge off-gas <br /> collected. An air compressor will be used to perform the sparge test. Two air <br /> filters in parallel will be used to filter and remove any oil in the compressed air <br /> before delivery to the sparge well. <br /> i5. The test well will be sparge tested at two pressure levels- approximately 120 <br /> percent of hydrostatic head and 150 percent for a minimum of 2 hours at each <br /> pressure or until steady-state conditions are reached. The general limit of 0 7 <br /> prig per foot of overburden will not be exceeded to avoid soil fracturing. At each <br /> pressure step, the subconsuitant will allow approximately 2 hours for the <br /> parameters to reach their approximate steady-state values, and will monitor the <br /> following listed parameters before, during, and after each sparge test. <br /> • Depth to water in sparge monitoring wells every half hour. <br /> 1 <br />