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CHRONOLOGY See prior reports for period from 03/31/92 to 08/20/93 09/29/93 Collect influent and effluent samples of the system. Flow rate 83 . 29 cfm. 10/06/93 Collect influent and effluent samples of the system, and vapor samples from VSB3 , VSB5, VSB9, VSB11 and MW5 for analysis at WEGE laboratory Flow rate 62 94 cfm VAPOR SAMPLING On site sample analysis is performed using a Photovac 10S50 PTD chromatograph The chemical make up of the vapor produced at the site has changed with vapor extraction. The light hydrocarbons have been depleted and the heavier hydrocarbons are now the dominate hydrocarbons being produce . Because of this it is no longer practical to perform on site analysis with the lOS50 COLLECTING LABORATORY SAMPLES Influent Sample The influent sample is obtained from a sample port located after the system vacuum pump before the carbon canisters . Sterile poly tubing is used to attach a 1 liter tedlar bag, fitted with a special septum valve and tubing bib, to the sample port . The sample port is on the pressure side of the pump and therefore the bag will fill without need of a pump. Once the tedlar bag is filled, its valve is closed and locked and the appropriate label is placed on the tedlar bag. Effluent Sample A sample port for the effluent is located in the exhaust stack of the final canister The flow pressure from the exhaust is great enough to fill a tedlar bag Sterile poly tubing is fitted to the exhaust port and the tedlar bag. Then the sample valve of the tedlar bag is opened and the bag is filled with the sample. Once the tedlar bag is full, the valve is closed and locked, the sample port closed, and the appropriate label is placed on the bag The labels for both the influent and effluent tedlar bag samples show the date, time, sample ID## and analyses to be run. page 2 of R604 , 10/21/93