ARCHIVED REPORTS XR0006575 - Laserfiche WebLink

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dissolved hydrocarbon plume associated with Former Regal Station 603, and the existing vapor extraction system has had some positive effect on the well In order to gxpedite ground water clean up- of this site, we believe that limited (once a week for two hours) bio venting of this well will enhance biodegradation and act as migration control for the plume' s leading edge RESULTS The September 14 , and both of the October 26 , 1994 samples indicate that 0 02 pounds of gasoline range hydrocarbons would be released per week from a two hour per week bio-venting of MW8 The certified analysis from a sample obtained on October 26 , 1994 , indicates that 0 088 pounds per week would be released, see Appendix A for field notes and laboratory report VAPOR SAMPLING COLLECTING SAMPLES The sample is obtained from a sample port located, prior to the vacuum pump from a sample port on the flow meter orifice Sterile poly tubing was 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 vaccum side of the pump and therefore a vacuum greater than the well vacuum must be exerted on the outside of the tedlar bag to obtain " fill" the bag with the vapor sample A special vacuum box, in which the tedlar bag is sealed inside, is used to exert a high vacuum to the exterior of the bag, thereby pulling a sample into the bag Once the tedlar bag is filled, its valve is closed and locked and the appropriate label is placed on the bag The label shows the date, time, sample ID# and analyses to be run and the samplers initials The tedlar bag samples are then placed within a cooler, and are hand delivered to WEGE' s laboratory that same day The vapor sample is then infected into an FID (Flame Ionizing Detector) chromatograph and the resulting chromatogram compared to standard chromatograms of known TFH (Total Fuel Hydrocarbons , gasoline) and BTEX (benzene, toluene, ethylbenzene, and xylenes) concentrations A dual chromatograph comparison is also run BTBTEX, TC-E, PC Fr, clild LM-n EX, dioxide (CO2) concentration was also measured in the tedlar bag samples obtained on October 26 , 1994 CO2 was shown to decrease f rom 3 3o as measured one hour into the test to 2 Oo as rneasured at the termination of the test, two hours later Natural biodegradation of gasoline range hydrocarbons produce water vapor and CO2 in aerobic conditions This CO2 reduction • shows a benefit of allowing the natural oxidation to continue, by removing residual CO2 from the subsurface in/and near MW8 and 2