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•� + Canepa's Car Wash 6230 Pacific Avenue,Stockton,CA Second Quarter Groundwater Monitoring Report,April 2005 Page 6 of 10 Initial inspection of the SVE system was conducted on September 30, 2004, and a follow-up inspection was conducted on October 7, 2004 In a letter report, Soil Vapor Extraction System, submitted to Karen DeGroot of the San Joaquin Valley Air Pollution Control District(SJVAPCD), dated November 30, 2004, Condor provided data required in the SJVAPCD Authority to Construct document to obtain a SJCAPCD Permit to Operate The City of Stockton Municipal Utilities District (MUD) authorized the initiation of discharge of treated groundwater on October 28, 2004 Groundwater extraction and treatment, with subsequent discharge to the sanitary sewer began November 1, 2004 Monthly sampling and reporting of the final discharge of treated groundwater is required in the MUD groundwater discharge permit Those reports document the analytical results of the treated groundwater being discharged into the City of Stockton sanitary sewer system The laboratory analytical data for final discharge samples collected during October, November, and December 2004, and January 2005 indicated that none of the contaminants of concern were detected at or above the laboratory reported detection limits The laboratory analytical data for the final discharge sample collected on February 16, 2005 indicated that none of the contaminants of concern were detected at or above the laboratory reported detection limits except for MTBE, which was detected at a concentration of 120 pg/L This concentration of MTBE exceeded the discharge limit set forth in the MUD groundwater discharge permit, and the system was shut down Corrective action was undertaken The equipment was restarted as of April 6, 2005, and remained in normal operation during the months of May and June MASS REMOVAL AND DESTRUCTION CALCULATIONS The system was operating 744 hours between March 1, 2005 and June 1 2005, or 33% of the time This operational time was strongly effected by the by the 36-day shutdown referred to in the previous section, and is reflected in the subsequent mass removal and destruction calculations Aqueous Phase Mass Removal The groundwater treatment system has removed petroleum hydrocarbons from 205,410 gallons of groundwater during the second quarter of 2005 Groundwater treatment system samples and associated data were collected to monitor the operational efficiency of the system and the consumption of carbon (Attachment D) The primary groundwater extraction well is MW-1 MW-1 has contributed approximately 95% of the total groundwater influent into the treatment system The concentrations of BTEX, TPH-G, and MTBE detected in samples collected from MW-1 have been increasing as anticipated and discussed above A sample of the influent ground water primarily from MW-1 was collected during the second quarter 2005 groundwater monitoring event, but analysis for TPH-G was not conducted The TPH-G concentration of 30 mg/L detected in the sample collected from MW-1 on January 21, 2005 was consequently used to calculate total TPH-G removed from groundwater A total of 504,626 gallons have been treated by the system as of June 1, 2005 The calculation indicates that approximately 51 pounds of gasoline have been removed from the groundwater at the site during the second quarter of 2005 Furthermore, an approximate total of 126 pounds of gasoline have been removed since the system was made operational A calculation worksheet is included in Attachment D Vapor Phase Quantification Methodology Soil vapor mass removal and destructive Pfficiency calculations are made with the following _methodology Field_PID_ measurements are_collected weekly and laboratory samples are analyzed- ---- monthly The data is compiled and a correction factor is calculated between corresponding PID measurements and laboratory analytical results The correction factor is then applied to the PID �� CONDOR