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�K��, Working To Restore Nature Report on Vapor Extraction Test January 29, 1993 Coca-Cola Former Distribution Facility, Stockton, California 5400601 ' FIELD RESULTS ' Two vapor extraction tests were conducted A longer term test was conducted using VEW-3 as the extraction well, and a shorter term test using VEW-1 as the extraction well The remaining seven vapor wells were used as observation wells for each test The field results ' of the tests are reported in Tables 2 and 3 All wells were dry or contained minimal water, and so the entire screened interval in each of the eight wells was available for vapor extraction Well screen intervals are reported in Table 2 Longer Term Test During the longer term test, the highest induced vacuums were observed in observation well VEW-4 (0 78 inches of water) and in VEW-1 (0 27 inches of water) These values were observed at a low achievable vacuum of 10 inches of water and a low flow of 26 2 cfm, at ' 2000 engine RPMs These induced vacuum responses are considered to be moderate response levels The achievable flow of 26 2 cfm is considered to be low VEW-4 is located 26 feet from extraction well VEW-3 and VEW-1 is located 24 feet from VEW-3 The available screen interval in VEW-3 was 60 feet (interval of 8-68 feet) and the interval covers the entire screen intervals for VEW-4 and VEW-1 (43-68 feet and 25-45 feet, respectively) Well screen intervals and observation well distances from the extraction well are reported in Table 2 Lower Ievel vacuum responses were recorded in the remaining wells ranging from 0 06 inches of water in VEW-8 (37 feet from the extraction well) to 0 16 inches of water in VEW-6 (at 40 feet from the extraction well) and VEW-7 at 1S feet from the extraction well With the exception of observation well VEW-4, vacuum responses correlated reasonably well with distance from the extraction well, with the closest wells ' showing the greatest induced vacuums Data for VEW-4 indicate that subsurface stratigraphy may play a greater role in vacuum impact than distance from the extraction well. The estimates of effective radius of influence based on these results are presented in ' the "Discussion" section following Shorter Term Test ' The vacuum and flow rate obtained during the shorter term test on VEW-1, which achieved high air flow rates ranging from 82 to 109 cfm at high applied vacuums up to 100 inches of water at 2000 RPMs, were greater than those achieved with VEW-3 However, the induced vacuums in the observation wells were lower for VEW-1 than for VEW-3, as seen in Table 2 Vacuum impacts in observation wells ranged from 0 initially in VEW-4 to 0 17 inches of water in VEW-3. The low induced vacuum in VEW-4 can be explained by the fact that extraction well VEW-1 was not screened in the same or similar zone as VEW-4 However, t1I