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k 3 <br /> f � <br /> S <br /> 6.0 IN-SITU VAPOR EXTRACTION AND DESTRUCTION BY INCINERATION � <br /> 'a <br /> to the tog of the ground water. <br /> oil contamination exists from beneath <br /> As has been stated earlier s <br /> the tank excavation the intial tank removal, removed <br /> Overexcavation during Prior to replacement of <br /> contaminated soil to the 25 foot depth• s stem, 4 <br /> and dispensing Y <br /> the new double contained fiberglass thRsl were placed <br /> inch and 6 inch SCH 40 PVC 0.0: inch lotted Pipes <br /> vertically at the north corner and west corner <br /> to the treatment <br /> of the excavation <br /> respectively and manifolded via undergrounde. These pipes were <br /> compound with SCH 40 2 inch and 4 inch PVC Pipe- <br /> to <br /> ip <br /> to be used for future soil remediationjo. <br /> d 6 <br /> WEGE Plans to utilize <br /> monitor <br /> welinMthe tankgexwith the cavation4for ansoil <br /> b <br /> inch risers that have P <br /> vapor extraction. Monitor well MW10 has ibee=u1n�cbeneath the <br /> treatment compound with 2 inch SGH 40 P ort Will connect this pipe <br /> Sample <br /> surface. A needle valve withextractionpmanifold) that hooks into <br /> to the steel manifold (vapor or t,xtraction. Also needle valves <br /> the blower to be used for vap <br /> with sample ports will be used to connect the two tank excavation <br /> risers, monitor wells MW1 and MW2, the sediment tank, and the Air <br /> stripping "Convault" that will be connected positioned atthe the <br /> extraction manifold. Sample ports will also be p <br /> influent <br /> and earia11etemperature£ readingsandsamples.er for The <br /> tion- <br /> vacuum/press <br /> effluent will then proceed into the incineratowatervapor <br /> Incineration of gasoline range hydrocarbons produces <br /> efflunt of the il <br /> and Co,. A sample port at thressurneand temperature acinereadings, see <br /> used for obtaining sample, p <br /> Figure 8-Schematic of Vapor Recovery System. ;. <br /> 6.1 HYDROCARBON VAPOR SOURCE TEST <br /> Prior to start up of the ground water-vapor recovery system, a <br /> source test was performed on monitor well MW1O to determine the <br /> available hydrocarbons for vapor , 1991 andn. his wassshutedowntata8 <br /> started at 3 PM on Friday, Januaryy 11, <br /> 1 11, <br /> AM Tuesday, January 15, 1991, lasting for a total of $9 hours <br /> averaging a removal o£ 625 pounds of hydrocarbons per day for a <br /> total of 2313pounds <br /> of I acitdatedreharcoalbons as gtub lscrubs ine ewere dused r1as <br /> the test. gallon monitoring with a photoionizing <br /> emission control and daily The PID <br /> detector (PID} was used to predict breakthrough. <br /> indicated that breakthrough may be occuring Monday al efflun and a <br /> s obtained of the cha <br /> bag sample (tedlar bag) wathis sample was calculated early <br /> rcoal effluent at <br /> that time (5 dl Analysis of s <br /> morning and the sample showed break through had occurred <br /> Tuesday During <br /> and the test was shut down at 8 AM that morning- g <br /> 10 <br />