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Pilot Testing Report and Conceptual Corrective Action Plan July 15, 1994 Manna Pro, 4004 South EI Dorado, Stockton, CA 17 ' applied to the well was increased in three stages Groundwater levels in adjacent observation points were recorded using data loggers Sod vapor was withdrawn from the extraction well at a known vacuum and the resultant vapor flow rate was recorded Incremental increases in the vapor flow rate were made at the extraction well and the vacuum response induced in the subsurface was measured at the adjacent observation well vapor monitoring probes (observation points) and recorded for each of the extraction rates The vacuum at each observation point was quantified using a magnahelic gauge By examining the vacuum response and groundwater level fluctuations at surrounding observation points, an effective radius of influence for sod vapor extraction and groundwater capture zone was determined Data collected during the combined groundwater pumping and HVE test was analyzed to evaluate ' the applicability of this remedial technology for this site In addition, the effluent air stream from the extraction points was analyzed to assess the hydrocarbon discharge concentrations 522 Field Activities The combined groundwater pumping and HVE test was conducted on October 26, 1993 Before conducting the test, an exemption from air permit requirements from the San Joaquin Valley Unified Air Pollution Control District was obtained The test was conducted at four stages of increasing vacuum The groundwater extraction rate was held between 1 and 1 4 gpm during the first three stages of increasing applied vacuum After the third stage, the groundwater flow rate was increased to 3 75 gpm The air flow rate, applied vacuum, and field flame-ionization detector (FID) measurements of the HVE system were recorded at 0 5-hour intervals during the test Also, the groundwater extraction flow rate and water level data in the observation points were monitored at 0 5-hour intervals throughout the test Vacuum influence in adjacent observation points was also recorded During the fourth stage test, air samples were field analyzed with a FID In addition to the field FID analyses, an influent air sample was collected in a Tedlar'' air sample bag during the fourth test stage The sample was analyzed by GTEL for STEX, TPH-G and methane The analytical results are presented in Appendix A, and discussed in Section 5 2 3 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 The activated carbon air stream 2819R034 070 GROUNDWATER E[:]M TECHNOLOGY,INC