Laserfiche WebLink
4 <br /> Mr. Sam Savig <br /> C A M B R I A June 22,2001 <br /> i <br /> Extracted soil vapor hydrocarbon concentrations were measured with a Horiba model MEXA- <br /> 554JU flame ionization detector(FID). Vapor flow was measured with a thermal anemometer. <br /> Vacuum levels were measured with a digital manometer and magnahelic guages. Drawdown data <br /> was collected by measuring the depth to water with a water level meter. <br /> Vapor Sampling and Analyses: Vapor samples were collected from each of the SVE test wells <br /> near the end of the SVE tests, and an effluent sample was collected near the end of the final SVE <br /> test on MW-l. The samples were analyzed for total purgeable hydrocarbons, calculated as <br /> gasoline (TPHg), benzene, toluene, ethylbenzene and xylenes (BTEX), and methyl tert-Butyl <br /> Ether(MTBE)by modified EPA Method 801518020. <br /> SOIL VAPOR EXTRACTION FEASIBILITY TEST RESULTS <br /> The data collected during the SVE tests are summarized in Tables 1 through Table 3. The <br /> analytical results of the vapor sampling are attached as Appendix B. <br /> SVE Test - Well EW-1: The SVE test on this well was performed for a period of 145 minutes. <br /> Well vacuum varied from 16 to 39 inches of water column (in. WC) during the test. Vapor <br />• extraction flow rates ranged from 33 to 78 cubic feet per minute (cfm). The hydrocarbon <br /> concentrations in extracted soil vapor remained at 0.0 parts per million (ppm) throughout the SVE <br /> test. <br /> A maximum vacuum influence of 0.45 in. WC was observed in well MW-1. Drawdown, most <br /> probably from groundwater extraction, was noted in wells MW-413, MW-1, EW-2, and MW-2 <br /> during the test. <br /> SVE Test - Well MW-4B: The SVE test on this well was performed for a period of 60 minutes. <br /> Well vacuum varied from 225 to 257 in. WC during the test. Vapor extraction flow began at <br /> 27 cfm, then fell rapidly to 0 cfm. The hydrocarbon concentrations in extracted soil vapor <br /> remained at 0.0 ppm throughout the SVE test. <br /> No vacuum influence was observed in surrounding wells. <br /> SVE Test - Well MW-I: The SVE test on this well was performed for a period of 60 minutes. <br /> Well vacuum varied from 14 to 15 in. WC during the test. Vapor extraction flow rates ranged <br /> from 41 to 46 cfm. The maximum hydrocarbon concentration in extracted soil vapor was 3 ppm <br /> during the SVE test. <br /> A maximum vacuum influence of 0.25 in. WC was observed in well MW-2. <br /> 0428 2 <br />