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1 <br /> 4.5 Supplemental Fuel <br /> At some time during the remediation project, supplemental fuel will be required for the <br /> operation of the SVE unit Natural gas is available on-site Representatives of P G & E , <br /> the local natural gas provider, will install a dedicated gas line The line vkill connect with <br /> the SVE unit within the proposed enclosure A meter will be installed to monitor <br /> supplemental fuel consumption <br /> 4.6 Monitoring <br /> The SVE unit will be monitored using a photo-ionization detector (PID) PID readings will <br /> ' be collected on a weekly basis and plotted to track remediation progress Ho.;fever. for the <br /> first few weeks, PID readings will be collected at least twice a week The data obtained <br /> from the PID readings will assist in determining when to di ill confirmation borings PID <br /> ' readings will be measured at three locations at the SVE intake, prior to catalytic <br /> destruction, and after catalytic destruction Sample points are installed on the SVE unit at <br /> each of these locations <br /> ' Air samples will also be collected on a monthly basis These air samples will be collected <br /> from a sample port installed before the drop-out drum (or at the well ]lead) The samples <br /> ' will be collected in Tedlar bags and transported to a state-certified laboratory for analysis <br /> The samples will be analyzed for TPH as gasoline and BTE&X in accordance %pith approved <br /> EPA methods These samples «ill be important in correlating PID readings and <br /> A determining clean-up Ievels <br /> ' A log book will be stored at the site for all monitoring <br /> will dand maintenance activities This book <br /> ocument all pertinent data for the project including engine running time, vapor flow, <br /> PID readings, engine coolant levels, blower pressure levels and supplemental fuel <br /> consumption (if possible) <br /> 4.7 Estimated Clean-up Time <br /> Although no estimates of the total mass of hydrocarbons were provided in the PAR, based <br /> upon soil sample and SVE test data, as much as 1,000-gallons (approximately 3,075 kg) of <br /> ' hydrocarbons (aged gasoline) may be present in soil at the site Based upon a very <br /> conservative recovery rate of 4 kg/day, we estimate a clean-up time of approximately 2 years <br /> (the theoretical limits of a vapor extraction system is up to 890 kg/day in ideal conditions) <br /> ' The unit will operate 24-hours a day, with the exception of scheduled maintenance down- <br /> time <br /> ' However, as hydrocarbon concentrations in the soil decrease, an IC-based unit may not be <br /> the most effective. Generally, IC-based units are most effective in removing and destroying <br /> high concentrations of hydrocarbons ( 10,000 ppm) However, as concentrations decrease, <br /> more supplemental fuel is needed to operate the unit at peak efficiency Therefore, <br /> ( <br /> G­],,.I A,11 Se—I� i 1 <br /> C APIN FAP/)955C 94 12 LOS&D2 <br />