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t <br /> 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 /> 4 <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 thq 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 wind 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 /> e o Waemotdringr;� 2��i ] ' 1S��Q <br /> � 1 <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, see <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 EX 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 /> tenet showed vacuum influence across the entire lot with the <br /> exception of northwest corner near MWE, see figure 9A. <br /> K <br /> RECO)MFMATIONS <br /> Ooh <br /> sam in ando%,�,quihrterly, cround, <br /> n <br /> bNMr� rrx Si y. s _ r r_,,• �.�1��`�11�on�tor�'W�i�'.�.5•t�Wi gnd <br /> o ;� hA � ` n � ns ,a�`bcst t,Yels <br /> page 10 <br />