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k� PA F 7''vl -�' � M <br /> r � <br /> w, gts ` A", §? ,laf <br /> ! <br /> f� ,�.5 � ';�� - �`1'! �h ,RsAI� ..� w�. • � Fd�- fad t-n`���� .. <br /> S <br /> bas <br /> collect. Vapor extraction will treat the vad sezone from the the st of the <br /> et tank <br /> be <br /> excavation to tl"re top of the groundwater. Treated <br /> pumped into a 15,000 gallon holding tank. After testing the water be <br /> of Stockton sewage iwiillitt a Data <br /> pumped into the sewer (once approved by the city <br /> is to be gathered during the operation to determine the recovery rate and wells <br /> needed to capture the contaminant plums. Please see Figure 7 following, which is <br /> 'l extracted from the W1=GE Plan. <br /> � release from any equipment except from the <br /> 1n general, the system will not have any <br /> thermal oxidizer exhaust. However, the amount of discharge to the air from the <br /> exhaust will be well below the quantity limits of the district. <br /> i The design is based upon the following: <br /> For the groundwater: <br /> Flow rate: 1.5 gpm- <br /> Concentration of the contaminants in the groundwater: <br /> Benzene: 27,000 ppb <br /> Toluene: 26,000 ppb <br /> Ethylbenzene: 2,000 ppb <br /> Xylene: 2,000 ppb <br /> For the sotl vapor extraction system' <br /> Extraction rate: 250 scfm <br /> Concentration of the contaminants in the vapor: <br /> TFH: 42,700 ppm <br /> Benzene: 2237 ppm <br /> Toluene: 2815 ppm <br /> Ethylbenzene: 110 ppm <br /> E" Xylene: 922 ppm <br /> Methane: 144031 ppm <br /> The principal equipment components are the air stripper and the thermal oxidizer. The <br /> i' flow rates through the air stripper: <br /> Air rate: 150 scfm <br /> `- Water rate: 1.5 gpm <br /> 2 <br />