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. 6 2 Air-S ar in IVa or-Extraction System Operation Overview <br /> The ASNE system operated as designed during the months of August a n d <br /> September 2003 During the two months, ASE varied the air-flow and <br /> vacuum-influence on the wells in an effort to (a) reduce channeling and (b) <br /> concentrate on the areas of the site where elevated hydrocarbons in <br /> groundwater remained <br /> 6 3 Flow Rate <br /> While operating, the system infected an average of 33 cubic feet p e r <br /> minute (cfm) of air into the AS well manifold, and extracted an average of <br /> 50 cfm of petroleum-hydrocarbon laden air from the VE well manifold <br /> The IC engine operated typically at 1900 RPM <br /> 6 4 Maintenance <br /> The IC engine was turned off each 220 to 250 hours of operation to <br /> perform routine maintenance activities Scheduled maintenance included <br /> lube, oil and filter for the engine and blowers, and draining of the moisture <br /> knock-out drum <br /> 6 5 Influent Air Sample <br /> On August 18 and September 26, 2003, ASE collected an influent air <br /> sample from the manifold of the VE wells The sample was analyzed by <br /> Kiff Analytical of Davis, California for TPH-G, BTEX, the seven fuel <br /> oxygenates and lead scavengers by EPA Method 8260B The analytical <br /> results for these samples are tabulated in Table Four The influent air <br /> sample analytical reports and chain of custody records are included in <br /> Appendix B <br /> 6 6Mass Removed by ASNE System <br /> The influent TPH-G concentrations in air were used to calculate t h e <br /> estimated mass removed from the vadose-zone beneath the site during <br /> August through September 2003 based on the volume of air removed The <br /> Monthly Mass Extraction Calculations are presented in Table Four It shows <br /> that based on an average extraction flow rate of 50 cfm, and assuming a <br /> constant TPH-G concentration during the month in the influent air stream, <br /> • the system recovered 0 62 gallons of gasoline from the vadose-zone during <br /> the two months To date, the ASNE remediation system has recovered and <br /> Frank's One Stop Quarterly Report — September 2003 Sampling <br /> -4- <br />