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I ERI 205505 ROI Tosco Service Station 5886,Stockton,Califorma December 28, 1999 1A AS/SVE Test bttrpretation and Removal Rates ERI estimates an effective radius of influence (ROI) for SVE by evaluating the distance from the extraction well where the induced vacuum is equal to or greater than 0 5 inch of water A "best-fit" line applied to plots of maximum induced vacuum versus distance from the extraction well yields the ' ROI The estimated effective vacuum ROI for SVE at this site Is approximately 30 feet (Graph 1) as shown on Plate 6 Using standard operating procedure (SOP) 25 "Hydrocarbon Removal From a Vadose Well" (Appendix C), ERI estimated that approximately 0 007 pounds of total purgeable petroleum hydrocarbons as gasoline (TPPHg) and 0 061 pounds of MTBE were removed during the AS/SVE test Results of laboratory analyses and cumulative pounds of TPPHg and MTBE removed are shown In Table 2 MTBE concentrations and removal rates are presented on Graph 2 Based on readings collected from MW3 on May 12, 1999, the projected initial SVE removal rates are <0 03 pounds per day of TPPHg, and 0 06 pounds per day of MTBE 332 Summar Conclu ion Based on the data collected In the field during the test periods and analytical laboratory results • Approximately 0 007 pounds of TPPHg and 0 061 pounds of MTBE were removed by SVE • The estimated effective vacuum ROI for SVE is approximately 30 feet AP Y ' • The projected initial removal rates for SVE are <0 03 pounds per day TPPHg, and ' 0 06 pounds per day MTBE • Based on data collected during the feasibility testing, SVE with AS appears to be technically feasible However, based upon soil vapor concentrations, removal rates, and operational costs, ' It is not economical to implement AS/SVE as a soil remediation system at this site 6