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' SOIL VAPOR EXTRACTION PILOT STUDY REPORT San Joaquin County Montgomery Ward Auto Service Center Public Health Services Department 5400 pacific Avenue, Stockton, CA Site Code 2163 ' The wells were completed with quick connect fittings at the well box for connectingto a temporary VES unit The well heads also were equipped with sampling ports to allow ' measuring vacuum and collecting vapor samples 5 1 2 Aar Sparging Wells ' Well construction details for all air sparging wells are provided in Appendix F In addition to being used as a vapor extraction well, Well VEW-113 was also screened between 64 and 65 feet bgs (which is about 20 feet below the ground water table) so that the well can also be used ' as an air sparging well Figure 9 shows final construction detail of VEW-1B as an air sparging well A 64 foot long, 1-inch PVC pipe assembly was constructed with a packer at the bottom and blank casing above the packer A 3/8 inch tubing was inserted through the 1- ' inch pipe such that the tubing extended from the top of the blank casing to 1 foot below the packer The complete 1-inch assembly was inserted inside the 2-inch casing of VEW-113 such that the packer was located at 64 ft bgs (lust above the Iowest screened interval) and the 318" ' tubing extended 1 foot below the packer At ground level, the 318" tubing was connected to the air sparging unit In addition to the VES well screens in the vadose zone, wells VEW-3, VEW-4, and VEW-5 were also screened across the top of the ground water table (between 40 and 50 feet bgs) to allow monitoring ground water conditions (e g dissolved oxygen level and contaminant concentration) around the sparging well, VEW-113 5 1 3 Sail Vapor Probes Well construction details for all soil vapor probes are provided in Appendix G The probes I were constructed to allow monitoring at specific distances away from the main nested VEW wells (VEW 1A and VEW-113 and VEW-2 and VEW-2B) and at specific depths below ground surface Probes SP-1 and SP-7 were completed as nested dual probes at depths of 20 feet bgs (SP-1A and SP-7A) and 35 feet bgs (SP-1B and SP-713 ) The other probes (SP-2 to SP-6) were all completed at a single depth of 25 feet bgs The relative distance of each probe from the two main VES wells, and the depth of the probe below ground surface, are as follows (see I figure 8) PROBE DISTANCE (FT) DISTANCE (FT) NUMBER FROM VEW-1A FROM VEW-113 DEPTH FT ISP-IA 25 20 20 SP-113 25 20 35 SP-2 14 14 25 SP-3 35 35 25 SP-4 36 41 25 SP-5 112 112 25 SP-6 102 100 25 SP-7A 60 60 20 SP-713 60 60 35 SP-8 40 43 35 Protect No 1232 - 6 - ENVIRONMENTAL AUDIT, INC