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4) Place purge water in DOT drums and store on-site pending analytical results. <br /> 5) Transport water samples in chilled container under chain of custody to a state- <br /> certified laboratory. <br /> 6) Analyze water samples for TPH as gasoline and BTE&X in accordance with EPA <br /> methods 8015m and 602, respectively. <br /> 6.3 Air Sparging Pilot Test <br />- After the soil and groundwater sampling has beeT1 completed, an IAS pilot test will be <br /> initiated. The duration of the Pilot Test will be approximately one (1) week. Soil vapor <br /> samples will be collected from the sparging (injection) well, the recovery well and the <br /> surrounding monitoring wells prior to initiation of the sparging test. Groundwater depths <br /> in the sparging (injection) well and the surrounding wells will be measured during the test <br /> to monitor potential mounding in,the area of the IAS system. The following procedures will <br /> be performed for the IAS pilot test- <br /> 1) Collect soil vapor samples from monitoring wells MW-2, MW-6, MW-9 and the <br /> nested sparging/recovery wells (MW-12A and MW-12B). Samples will be collected <br /> f-: in Tedlar bags or vacuum canisters and transported under chain-of-custody to a state- <br /> certified analytical laboratory. <br /> 2) Analyze soil vapor samples for TPH as gasoli ie and BTE&X in accordance with the <br /> appropriate EPA methods. <br /> 3) Install a regenerative blower to MW-12A to be used to inject air into the aquifer. <br /> The blower will supply air to the groundwater to strip volatile petroleum <br /> hydrocarbons. <br /> �F 4) Install a second regenerative blower to MW-12B to be used as a recovery well. The <br /> second blower will apply a vacuum and extract air with volatile hydrocarbons to be <br /> discharged to the air. <br /> d <br /> 5) Monitor air flow rates to the sparging well and from the extraction well. <br /> 6) Collect air samples from the extraction well. Samples will be analyzed for TPH as <br /> gasoline and BTE&X in accordance with State of California "LUFT" Modified <br />`^ CARB Method 410A - Low L.eveI Aromatics in Air. <br /> 1 , <br /> 7) Monitor depth-to-groundwater in the sparging well, extraction well and surrounding <br /> wells. <br /> 8) Monitor pressure gradients in surrounding wells. A magnehelic pressure gauge will <br /> X� <br /> C L.SL.l Audit S—L—.lee. 5 <br /> LW4N-9vL.MMF.m"u-B WPI <br /> Y <br />