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Each soil sample will be sealed with Teflon® film and plastic end caps, labeled, packaged in an <br />' iced cooler and transported with chain-of-custody documentation to a state of California-certified <br /> hazardous waste testing laboratory for analysis The lab will analyze each of the soil samples for <br /> TPH-as-gasoline, BTEX, MTBE, DIPE, ETRE, TAME, TBA and 1,2-DCA by EPA Method <br /> 8020/8015M and/or 8260B <br />' 4 23 Groundwater Monitonrng, Sampling and Analysis <br /> After the new monitoring well seals have set, and on a quarterly basis thereafter, the new wells <br /> and the existing wells will be monitored and sampled Depth-to-groundwater and free product <br /> thickness (if necessary) will be monitored using a water level indicator capable of measurements <br />' to within 0 01 foot Following groundwater level measurements, the wells will be purged and <br /> sampled <br /> The wells will be purged with decontaminated pumps and dedicated disposable tubing until at <br /> least three well casing volumes have been removed and/or after groundwater temperature, pH <br /> and electrical conductivity values have stabilized Groundwater will be sampled from the wells <br /> using disposable polyethylene bailers and laboratory-supplied containers Each sample container <br /> will be labeled, packaged in an iced cooler and transported with chain-of-custody documentation <br /> to a state of California certified hazardous waste testing laboratory The lab will analyze each <br /> groundwater sample for TPH-as-gasoline, BTEX, MTBE, DIPE, ETBE, TAME, TBA and 1,2-DCA <br />' by EPA Method 8020/8015M and/or 8260B <br />' 43 Remedial Feasibility Test Well Installations <br /> To test the feasibility of soil and groundwater remedial alternatives, one nested vapor extraction <br /> Iwell (SVE-1A/B/C) and one nested air sparge/soil vapor extraction well (AS-1/SVE-2B) will be <br /> installed The proposed well locations are shown on Figure 2 Well construction diagrams are <br /> 1 included in Appendix D <br /> 4 3 1 Nested Soil Vapor Extraction Well <br /> Based on the results of the previous site investigation, relatively permeable and heavily impacted <br />' subsurface soils exist in the vicinity of the former UST #3 source area The three-well soil vapor <br /> extraction well will be located approximately 20 feet west of the former UST, and will be <br /> constructed to focus remedial efforts on the intervals containing the greatest mass of gasoline <br /> 13 <br />