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s <br /> t <br /> Each wellhead will be equipped with vacuum gauges, a sample port, and <br /> a control valve so that well performance can be monitored and the <br /> flow rate adjusted to maximize .recovery rate. The IC engine is <br /> - capable of drawing up to approximately 150 cfm depending upon soil <br /> .-. conditions. It is estimated that from within the wells, the TPH as <br /> i . gasoline concentrations in vapor will be reduced below 1115 pg/l (250 <br /> w, ppmv) within 60 days of operation. The: actual length of IC <br /> operation, as well as the relative flow rates from each well, will be <br /> based on observations and sample or PID/0VA results collected under <br /> operating conditions. <br /> i; <br /> The IC engine will be utilized for the initial extraction period <br /> (anticipated 30 to 60 days) during which vapor concentrations drop <br /> rapidly. After the effluent air stream drops below approximately 10 <br /> lbs of hydrocarbons per day, the IC engine will be removed and re- <br /> placed with activated carbon canisters and a vacuum blower to <br /> complete remediation. The selected blower will be capable of <br /> extracting r <br /> R g a pproximately 200 cfm under the site conditions. It is <br /> estimated that the blower/carbon adsorption unit will operate for <br /> approximately 150 to 220 days. <br /> is <br /> mov <br /> The extraction system will be constructed, operated, and monitored in J <br /> accordance with San Joaquin Air Pollution Control District <br /> requirements. System operational monitoring will be at least on a <br /> weekly basis, depending on s&T.ple results. Log books with signed <br /> entries will be maintained recording the following <br /> monitoring/operational data; <br /> Flow rate <br /> i <br /> �. 2. Vacuum <br /> 3. Barometric pressure <br /> 4. Date/time of any sampling <br /> L5. Ambient temperature <br /> 6. 4-later levels/time <br /> 7. Maintenance activities <br /> 8. Relative humidity <br /> 9. System status <br /> -- ---- -- - - ----TO: PID or OVA readings <br /> .. �. MIb*r Point Prop+rty - NS <br /> �uPossi.zrP 13 - <br />