ARCHIVED REPORTS XR0009281 - Laserfiche WebLink

Home Browse Search

La Geological Talutia t,x Dual Phase Extraction pilot Test Report �+ Project No. 723.2 Page 10 November 5,2004 extraction system drawing from EW-I would be sufficient to address the soil beneath Portion of the site. h a major The laboratory analyses of the soil vapor samples obtained during the test are summarized in Table I in Appendix A, and in the following table: Well Date Time Benzene Toluene Eth I X lene TPH-G u L u L Benzene u L U u L EW-1 07/26/049:45 380 1400 250 990 16000 07/26/04 18:00 250 960 200 870 11000 �- 07/27/04 9:00 160 640 140 610 7100 07/27/04 17:00 540 1000 170 730 9600 07128104 0:40 460 760 80 300 7300 07128104 1 8:00 170 470 84 340 5400 07/28/04 16:30 460 880 140 590 9400 07/29/04 1 9:00 410 830 150 670 9200 The highest concentrations were measured when vapor only was extracted. from EW-l- As water was extracted the vapor concentrations fell as more vacuum was applied to removing water from the increased depth of the stinger elevation. GTI used the laboratory data in conjunction with the extraction rates in Table 3 to determine the amount of contaminant mass removed by vapor extraction during the test. ti As shown in Table 6 in Appendix A the vapor extraction system removed 485 kg or 173 gallons of gasoline range petroleum hydrocarbons (TPH-G) during the week long period. It is noted that this amount includes some TPH-G separated (volatilized) out of groundwater by the liquid ring pump process. 5.2 Groundwater Extraction Groundwater samples were obtained during the test from two locations: well EW-1 using a disposable Teflon bailer; and from the treatment system discharge port which is located after the liquid ring pump water/vapor separation process. The laboratory results of these samples are included in Table 2 and the following table: 4 f.r