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A <br /> v <br /> A S s D C I A 7 E s I N C <br /> corrective action will be performed before repeating the startup sequence SJVUAPCD will be notified <br /> that emission limits were exceeded within 24 hours of such indication Vapor phase granulated <br /> activated carbon is a proven technology and destruction efficiency is not anticipated to be a concern <br /> Having two canisters in series will provide a safeguard against exceeding emission limits Monitoring <br /> vapors from the sampling port in between the two canisters will provide an indication when <br />' breakthrough has occurred This will allow sufficient time to change out the carbon if necessary prior <br /> to emission to the atmosphere Typical SJVUAPCD guidelines require that, extracted vapor influent to <br /> and effluent from the carbon system will be monitored with a field instrument approved by the <br /> SJVUAPCD on a dally basis until the frequency of carbon changeout can be evaluated System <br /> momtonng frequency will likely be changed to once every 2 weeks or monthly, with a field instrument <br />' and monthly verification with by analytical laboratory testing upon receiving SJVUAPCD approval <br /> 6_4 Systems Performance Evaluation <br />' Following continued operation of the VES and air sparge system, a systems performance evaluation <br /> will be conducted to monitor the effectiveness of the remediation systems, and a report will be issued <br />' on a quarterly basis This report may include the following hours of operation, system influent and <br /> eluent field monitoring readings, laboratory results of influent and eluent air samples, total and <br /> individual vapor extraction well flow rates, total and individual air sparge well infection flow rates, <br /> induced vacuum responses recorded in observation wells, all other relevant field data collected, and <br /> results obtained such as observed radius of influence, system destruction efficiency, etc <br /> Recommendations will then be made to further optimize system performance and to further enhance <br />' remediation of impacted soil and groundwater Recommendations may include tie-in of additional <br /> vapor extraction or air sparge wells to the remediation system,upgrading of the off-gas abatement unit, <br />' etc <br /> 1 7.0 LUMTATIONS <br /> This report was prepared in accordance with generally accepted standards of environmental geological <br /> and engineering practice in California at the tune this investigation was performed This assessment <br /> was conducted solely for the purpose of evaluating environmental conditions of the soil and <br /> groundwater with respect to gasoline and waste-oil related hydrocarbons at the site No soil <br />'E engineering or geotechnical references are implied or should be inferred Evaluation of the geologic <br /> conditions at the site for the purpose of this assessment is made from a limited number of observation <br /> points Subsurface conditions may vary away from the data points available Additional work, <br />' including further subsurface investigation, can reduce the inherent uncertainties associated with this <br /> type of assessment <br /> i <br />' W 162574 OMAP report dac 12 <br />