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1� t] <br /> Fourth Quarter 2005 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, � iAwe <br /> Six regularly scheduled site visits were performed during this reporting penod/The site visit d� <br /> dates are October 10 and 25, November 7 and 21, December 12 and 27, 2005 Also included are <br /> field data sheets from September 2, the second source test date, and September 22, 2005 � <br /> (Appendix B) `Apex personnel found the system shut down for every visit listed above with the <br /> exception of the November 21, and December 12, 2005 site visits/System alarms indicated low <br /> process air pressure which usually means a loss of power to the system that shut the blower down <br /> if no other alarms are shown According to hour meter readings, the SVE system operated for an <br /> accumulated total of 60 days from the initial source test date through December 12, 2005 <br /> Vapor Analysis Performed: <br /> Anal sts Abbreviation Designation USEPA Method No <br /> Total Petroleum Hydrocarbons TPHgGas-Range <br /> as Gasoline Hydrocarbons <br /> Benzene ` Y <br /> TAromatic <br /> Toluene <br /> Eth (benzene BTEX Volatile 8260B <br /> Xylenes (Total) Organics <br /> Methyl tertiary-butyl ether MTBE Fuel <br /> Oxygenate <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 /> r <br /> System performance totals: <br /> This Quarter Cumulative <br /> Pounds of TPHg removed: 6,786 6,786 <br /> Pounds of benzene removed: 310 31 0 <br /> Pounds of MTBE removed: 0 0 00 l <br /> i <br /> The average influent TPHg concentration was 3,667 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 /> a 1,077 gallons of gasoI>ne related hydrocarbons from the subsurface <br /> r <br />