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I 16 Pilot Testing Report and Conceptual Corrective Action Plan July 15, 1994 Manna Pro, 4004 South EI Dorado, Stockton, CA 1s emissions were monitored during the test using a FID in order to determine the carbon vapor treatment effectiveness 523 Results The field monitoring data collected during the combined groundwater pumping and HVE test is presented in Appendix F and summarized in Table 6 As shown on Table 6, the groundwater extraction rate was held approximately constant as the applied vacuum was increased during the first three stages ' During the last phase (fourth stage) of the test, an increased constant groundwater pumping flow rate of 3 75 gpm was established It should be noted that this flow rate could not be maintained without the aid of HVE Table 7 identifies the wells that were monitored and shows the maximum drawdown observed at each well during the fourth stage of the combined groundwater extraction and HVE test Maximum drawdown of 2 38 feet was observed in well 013-1, located 9 5 feet from the pumping well after 350 minutes of pumping The results of the air sample collected during the fourth test stage were used to evaluate the initial hydrocarbon removal rate The analytical results indicate BTEX concentrations of 15,000 micrograms per Mer (a g/1) in the influent samples Air samples also show total hydrocarbon concentrations of 280,000 p g/I in the influent samples Analytical results are provided in Appendix A 524 Data Analysis To prepare the conceptual design for a soil vapor extraction system at the Manna Pro site, the effective radius of influence of theoretical vapor extraction wells was estimated The effective radius is defined as the maximum distance from a vapor extraction well through which sufficient air is drawn to remove the required amount of contamination in the desired time The effective radius is determined by performing a vapor extraction test on a single well (such as was performed at EW-1) and extrapolating the results to model a vapor extraction system of multiple wells To model a full ' scale remediation system, Groundwater Technology has developed a computerized design tool • entitled "Vent-ROI " ' 2819RO34 070 GROUNDWATER EEMTECHNOLOGY, INC