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i R603 UPDATE-15 4/8/93 } F 'cleaves the vacuum pump, it is pushed into the thermal oxidizer ' which oxidize the gasoline range hydrocarbon vapors at no less Ithan 14000F and no greater than 15500F. Influent samplesare Jobtained from the exit of the pump and effluent samples are. �. .3 obtained from the stack of the thermal oxidizer. The gasoline E grange hydrocarbons are oxidized into heat, CO2 and water vapor, see UPDATE STATUS REPORT #5 . Tedlar bag samples are obtained from the vapor stream influent from the individual wells (MW1, MW2-3, MW10 and EX-411 ) , influent f and effluent of the Remox thermal oxidizer and the effluent of 1 Ithe "ConVault" water stripper. The samples are delivered to WEGE' s portable laboratory and analyzed in WEGE' s portable : laboratory utilizing the Photovac 10s50 PID-GC and Shimadzu FID- GC. These samples were analyzed for TFH and BTEX along with Gscreening for Tetrachloroethylene, (PCE) , Trichloroethylene (TCE) �� and 1, 2 , -Dichloroethane (DCE) using a Shimadzu GC-FID chromatograph mounted permanently in WEGE' s portable laboratory. „ These compounds have the following retention times in the _ above ) chromatograph, DCE = 2 . 079 minutes, TCE = 3 . 023 minutes and PCE = ; 3 . 75 minutes . Before sampling the wells or the system, a JIcalibrant made from fresh gasoline is injected into the GC-PTD f 1 and GC-FID. The resulting chromatograms has numerous responses . l� The microprocessor of the GC-PID and GC-FID computes the area per d. } ;, response in volt seconds and assigns a peak number and retention la time . The sum of all the responses are then used to obtain a a � mg/L per volt second calibrant factor, which is used to calculate 4mg/L as gasoline vapor from each analysis produced. . Pounds per E, ' day can be computed using these mg/L values produced from the i analysis of the different vapor recovery wells, the influent to ' lthe oxidizer, the pressure differential created at the orifice to Mdetermine flow rates for each well, and the influent to the oxidizer. The pounds per day values for each well and the I ainfluent are averaged with the preceding site visit' s pound per qday value . This figure is then multiplied by the number of hours ) the system operated between visits, to estimate the total pounds each well and the system has removed for that time period. This figure is added to the accumulated poundage of the previous visit to update the total pounds removed. The effluent sample is computed in in the same fashion, but also includes natural gas flow along with the influent orifice flow rate . k SAMPLING VAPOR STREAMS The vapor samples are obtained by attaching a dedicated air tight ) poly tubing to a sample port on the vapor recovery manifold (on the well side of the orifice plate) . The tubing is attached to a E, ' , air tight - fitting that connects a valved one liter tedlar bag , 1which is placed inside a air tight sample box. The sample port his opened and a vacuum is placed on the tedlar bag inside the E . " sample box, filling the tedlar bag with the vapor stream. Once . ifull the sample port is closed, the vacuum is withdrawn and , the :k tedlar bag valve is closed, sealing the vapor stream sample inside the tedlar bag. A small dedicated needle attached to a dedicated 1 cc syringe is then inserted into the septum of the PAGE 5 �'