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} <br /> ,y ■ <br /> First 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 January 9 and 23, February 6 and 22, and March 23, 2006 'Apex personnel found the <br /> system operational for every visit listed above with the exception of the March 23, 2006 site <br /> visits The system alarm indicated high water level in the knockout drum According to hour <br /> meter readings, the SVE system operated for an accumulated total of 86 days from December 12, <br /> 2005 through March 23, 2006 <br /> Vapor Analysis Performed <br /> Analysis Abbreviation Designation I USEPA Method No <br /> Total Petroleum Hydrocarbons TPHgGas-Range <br /> as Gasoline Hydrocarbons <br /> Benzene Aromatic <br /> Toluene BTEX Volatile 82608 <br /> Eth (benzene Organics <br /> Xylenes. (Total) <br /> Methyl tertiary-butyl ether MTBE Fuel <br /> OxVqenatel <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 Quarter Cumulative <br /> Pounds of TPHg removed: 2,911 9,697 <br /> Pounds of benzene removed: 2 0 33 0 J <br /> Pounds of MTBE removed. 0 0 0 0 <br /> The average influent TPHg concentration was 893 parts per million by volume (ppmv) this <br /> period The fuel oxygenate MTBE was reported as below laboratory detection limits to all <br /> samples collected for this period To date, the remediation system has recovered approximately <br /> —;5;k <br /> 539 gallons of gasoline related hydrocarbons from the subsurface <br />