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Pilot Testing Report and Conceptual Corrective Action Plan July 15, 1994 Manna Pro, 4004 South EI Dorado, Stockton, CA 21 at the adjacent observation points and recorded for each of the extraction rates Groundwater levels In adjacent observation points were recorded using data loggers The vacuum at each observation point is quantified using a magnahelic gauge By examining the vacuum response and groundwater level fluctuations at surrounding monitoring points, an effective radius of influence for soil vapor ' extraction and capture zone for groundwater containment may be determined Data collected during the HVDPE test was analyzed to evaluate the applicability of the technology as a viable remedial technology for this site 532 Field Activities The HVDPE test was performed on October 27, 1993 During the test, sod vapor and groundwater was extracted from EW-1 and vacuum response data and groundwater levels were collected from adjacent observation points A 3-horsepower liquid-ring pump was used to perform the test The pump was equipped with vacuum gauges and an ambient air intake valve used to regulate the ' amount of vacuum A drop tube was used during the test to adjust the intake of the liquid-ring pump in the well The test was run in four stages During the first three stages, the drop tube (intake), utilized to facilitate groundwater flow to the liquid-ring pump was kept at a constant depth (36-38 feet) and the applied vacuum was increased in three intervals (low, medium, and full vacuum) For the final stage of the test, the vacuum was kept on full and the drop tube was lowered to the bottom of the well The vapor flow rate was measured with a heated wire anemometer and recorded during each test I stage The vacuum response and groundwater level at each of the adjacent observation points were measured and recorded at 0 5-hour intervals throughout the test During the first three stages of the test, air samples were collected in plastic bags and field analyzed with a FID The extracted sod vapor was treated through one vapor-phase activated carbon unit to remove organic compounds present in the soil vapor prior to discharge Vapor-phase carbon breakthrough was monitored during the test using an FID 2619RO34 070 GROUNDWATER TECHNOLOGY, INC