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' SOIL VAPOR EXTRACTION PILOT STUDY REPORT <br /> San Joaquin County <br /> Montgomery Warr!Auto Service Center Public Health Services Department <br /> 5400 Pacific Avenue Stockton, CA Site Code 2163 <br />' ■ Required soil probe configuration, <br /> ■ Baseline soil vapor concentration, <br />' ■ Radius of influence for air sparging test, and <br /> ■ Changes in vapor concentration or dissolved oxygen in water during air sparging <br />' 5.0 INSTALLATION OF PILOT VES <br />' This section presents the various wells and probes that were installed as part of the pilot study <br /> system, specifies the planned use of each well, provides construction details (as-builts) and <br /> presents the relative layout of all the wells and probes <br />' 5.1 VES Wells Air Sparging and MonitoriLig Wells Soil Vapor Probe Installation <br />' Figure 8 shows the locations of the various VES wells, air sparging/vapor extraction wells and <br /> soil vapor probes that were installed as part of the pilot study (the same figure also shows the <br /> locations of all previous borings and wells on site ) The wells and probes are appropriately <br /> grouped and listed below <br />' VES Wells <br /> VEW-lA & VEW-1B, VEW-2 & VEW-2B Nested VES wells <br /> VEW-3, VEW-4, VEW-5 VES wells with distinct VES screen interval <br /> Air Sparging Wells <br /> VEW-1B Screened at 20 feet below ground water to serve as an air sparging well also <br /> VEW-3, VEW-4 and VEW-5 Screened across ground water table to allow monitoring of <br /> ground water quality when using VEW-1B as air-sparging well <br /> Sail Vapor Probes <br /> SP-IA & SP-1B, SP-7A & SP-7B Nested soil vapor probes <br /> SP-2, SP-3, SP-4, SP-5, SP-6 & SP-8 Soil vapor probes set at distinct depths <br /> ITable 9 provides construction specifications for the installation of all the wells and probes <br /> 5 1 1 VES Wells <br /> Well construction details for all VES wells are provided in Appendix F Well VEW-1 was <br /> designed to be located at the center of the impacted soil plume near B-11 Well VEW-1 <br /> I consists of a dual well configuration (VEW-1A and VEW-1B) VEW-1A was screened <br /> between a depth of 10 feet bgs and 25 feet bas while VEW-1B was screened between 25 feet <br /> bgs and 40 feet bgs This dual-well completion will allow targeting specific depth intervals of <br /> the soil plume in this area <br /> Well VEW-2 was screened from 15 to 35 feet bgs Well VEW-2B was screened between 35 to <br /> 50 feet bgs This dual-well completion will allow targeting specific depth intervals of the soil <br /> plume in this area <br /> Wells VES-3, VES-4 and VES-5 all have screens for vapor extracting at depths of 20 to 30 <br /> feet bgs <br /> IProject No 1232 - 5 - ENVIRONMENTAL AUDIT, INC <br />