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regulate the amount of vapors extracted from the wells and/or shut <br /> down the blower if emissions exceed the predetermined warning <br /> concentrations. <br /> The analysis of the vapor stream during the pilot test show that a <br /> uncontrolled system would produce approximately a pound of benzene <br /> a day. Due to the high vapor pressure of benzene, benzene is one <br /> of the compounds that is most susceptible to vapor extraction and <br /> thus would diminish in its concentration in the vapor stream as <br /> extraction goes on. With this in mind all emission controlled by <br /> the above IR analyzer, which would control the amount of the vapor <br /> stream produced from the extraction wells, would keep the releases <br /> at or below the allowable emissions already allocated for this <br /> site. <br /> CONCLUSIONS <br /> The; .results of , ground. :water monitoring, November:: .21, 1990' <br /> indicate that; the ground water has droppedpproximataly eight <br /> feet: , since.,_early January,` 199.0,. and is flowing � redominately :t. <br /> the" southeast.,', Chemical r, s�aZts :of.,.the.water: samples'.taken:fr.om <br /> the. monitoL. .wells:show .cont�inatien to the :'gcound - ,water :with <br /> gasola.ne'ranges kaydrocarbo:�s, see-Table: 2, Figures 6:-and. 7: <br /> Soil contamination is limited to between the 25 foot and 40 foot <br /> depth of the eastern and western portions of the pump island area <br /> and southeast of the tank excavation, near soil boring SB2, sea <br /> Figure 8 and Table 1. This contamination is of gasoline range <br /> hydrocarbons. A vapor extraction source test . indicates .that <br /> approximately 59 pounds of gasoline range hydrocarbons can be <br /> pulled from the formation.per day via wells P1, P3 and EK at a <br /> flow rate of 30 cubic feet per minute. Also vacuum readings taken <br /> from the ground water monitoring wells during the pilot-source <br /> test showed vacuum influence across the entire lot with the <br /> exception of northwest corner near MW6, see figure 9A. <br /> RECOMMENDATIONS <br /> ground water. sampling and <br /> monitoring for:this site. <br /> 2. Perform intermittent pumping from monitor wells' MWI and <br /> MWS to control .tha_apread of the hydrocarbon plume using Lawrence <br /> vacuum pump'and ri-moving approximately 5o gallons from both wells <br /> page 10 <br />