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REME DIAL ACTION PLAN <br /> 1805 South EI Dorado StreeI Stoddon Caldorn.a <br /> 5_S Duration of Remediation <br /> The proposed vapor extraction system will be operated until system monitoring indicates <br /> soil vapor extraction has reached a point of limited effectiveness, for example, volatile <br /> hydrocarbons (BTEX) in the influent air stream are reduced to non-detectable <br /> concentrations and the hydrocarbon extraction rate is less than 1 pound per day At this <br /> time, Aegis will submit a workplan for confirmation soil borings to evaluate soil <br /> I remediation effectiveness Soil samples collected from the borings will document soil <br /> remediation or assess remaining petroleum hydrocarbon concentrations Vadose zone <br /> modeling may be performed to demonstrate the reduced threat to groundwater quality, <br /> if necessary <br /> Site closure will be requested from the appropriate regulatory agencies when remediation <br /> has been confirmed and documented <br /> I <br /> i <br /> I <br /> I91 044A RAP 9 <br />