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an air permit for the site Soil Vapor Extraction During site visits,SECOR monitored system parameters and collected appropriate influent soil vapor samples Based on the influent soil vapor samples analytical results, approximately 139 pounds of gasoline were removed and treated at an average extraction rate of 86 scfm for this reporting period A total of approximately 37,304 pounds of gasoline has been removed and treated at the site since the SVE system began operation The soil vapor analytical results and system efficiency results are included as Attachment III Dual-Phase Extraction On January 21'through 23'",2002,SECOR performed a 72-hour dual-phase extraction(DPE)event at the site The objective was to extract LPH from MW-1. Prior to initiation of field activities, SECOR notified the SJVAPCD in a letter addressed to Mr Fred Cruz,dated January 11,2002 DPE was performed using a 20-hp liquid ring vacuum pump connected to a H2 Oil Recovery Systems, Inc thermal oxidizer(Therm-ox)unit for treatment of the extracted soil vapor prior to discharge to the atmosphere DPE was performed on monitor well MW-1 for a period of approximately 72 hours Groundwater and soil vapor were removed simultaneously from the well by applying a high vacuum to a drop pipe that was lowered into the water table Physical and chemical parameters including applied vacuum,groundwater and soil vapor extraction flow rates, soil vapor temperature, and hydrocarbon vapor concentration measurements were • monitored throughout the DPE event Vapor concentrations were measured using a flame ionization detector(FID) Vacuum gauges were placed at nearby monitor wells in order to monitor the negative pressure gradient induced by DPE at the respective extraction well DPE data are summarized in Table B-1 of Attachment IV Using tedlar bags,SECOR collected air samples from the DPE system influent vapor Four influent samples were collected throughout the test The soil vapor samples were analyzed for TPHg,BTEX, and MTBE by EPA Method 8015m/8020 Results of these analyses are presented in Table B-2 (Attachment IV) Certified laboratory analytical reports and chain-of-custody documents are presented in Attachment IV FID measurements of the extracted vapor ranged from 257 7 parts per million by volume(ppmv)to 3,706 ppmv Estimates of the total mass of TPHg, benzene, and MTBE removed during the test were calculated using the influent air analytical results,an average flow rate,and the time duration of the DPE event The estimated TPHg and benzene mass removed during the DPE event were approximately 26 16 pounds and 0 09 pounds, respectively (Table B-2) Mass removal is shown graphically on Figure B-1 Additionally, during the test approximately 2,807 gallons of groundwater were extracted from the test well C Mwe 0MUckefordQ102 3 SECOR "OT 41737 00 0003