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•F <br /> Second Quarter 2006 Groundwater Monitoring and Remediation Status Report <br /> Cohn Property,3755 Munford Avenue,Stockton,California <br /> Page 5 <br /> Status of system operation during reporting period/ reasons for downtime. <br /> Six regularly scheduled site visits were performed during this reporting period The site visit , <br /> dates are April 14, 21, May 9, 25, June 15 and 26, 2006 Apex personnel found the system <br /> operational for every visit listed above According to hour meter readings, the SVE system <br /> operated for an accumulated total of 89 days from March 29, 2006 through June 26, 2006 <br /> Vapor Analysis Performed <br /> Analysis Abbreviation Designation USEPA Method No <br /> Total Petroleum Hydrocarbons TPHgGas-Range <br /> as Gasoline Hydrocarbons <br /> Benzene <br /> Toluene Aromatic <br /> BTEX Volatile 8260B <br /> Eth (benzene <br /> Xylenes (Total) Organics <br /> Methyl tertiary-butyl ether MToxyqenateTBE Fuel <br /> Remediation system tables (Tables 6 and 7) summarize extraction and emission data from <br /> sampling events that are normally performed at the beginning of each month Extraction rates <br /> are averaged between sample events The flow rates recorded in the field and lab analytical data <br /> are used to calculate approximate pounds of hydrocarbons extracted Laboratory analytical <br /> reports showed no detectable concentrations of petroleum hydrocarbons above detection limits in <br /> the effluent samples collected for this period The remediation system operated within the rules ' <br /> of the permit issued to the facility <br /> System performance totals <br /> This Ouarter Cumulative <br /> Pounds of TPHg removed 3,191 12,881 ' <br /> Pounds of benzene removed 1 0 340 <br /> Pounds of MTBE removed 0 0 0 0 <br /> The average influent TPHg concentration was 750 parts per million by volume (ppmv) this <br /> period The fuel oxygenate MTBE was reported as below laboratory detection limits in all <br /> samples collected for this period To date, the remediation system has recovered approximately <br /> 2,044 gallons of gasoline related hydrocarbons from the subsurface <br /> • <br />