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. Report of Findings <br /> Frontier Transportation <br />' 0200-024 <br /> March 3, 2000 <br /> Page 4 <br /> B-6 at 15' bg. Soil sample results support that petroleum hydrocarbon impacted soil is localized <br /> near the former USTs to a depth of 15' bg. <br /> In addition, BEII collected nine soil vapor samples from nine different soil vapor <br /> collection points (VI-4' through V9-4'). See Figure 2 for collection point locations. A hollow <br /> casing with a retractable tip was advanced to 4' bg using a direct push hydraulic rig. At 4' bg, the <br /> ti is retracted and the casing is lifted approximately 6-inches leaving asix-inch interval in the soil <br /> P <br /> for vapor collection. An air pump is connected to the casing and soil vapors are withdrawn an <br /> collected in a 1-liter Tedlar bag. Soil vapor samples were analyzed for total volatile petroleum <br /> hydrocarbons as gasoline (TVPH as gas), BTEX, and MTBE using <br /> Table 3 method <br /> thodfor i1 VO-3.VapSample <br /> Detectable MTBE concentrations were confirmed by GCMS (S <br />' Results and Appendix C for Laboratory Analytical Reports). <br /> Soil vapor sample analysis results identified no detectable concentrations of TVPH-gas <br /> from collection points V1-4', V2-4', V4-4', V7-4', and V94'. Maximum TVPH-gas <br /> concentrations were identified in soil vapor collection point V54' as 1,810 ppmV. TVPH-gas <br /> concentrations were identified as 92 ppmV from collection point V6-4'. Collection points V3-4' <br />' and V8-4' identified trace concentrations of TVPH-gas at 1.6 ppmV and 1.2 ppmV, respectively. <br /> No other TVPH-gas concentrations were identified (See Figure 4 for TVPH-gas Concentrations <br />' and Appendix C for Laboratory Analysis Results). <br /> Maximum BTEX soil vapor concentrations were identified as 16.11 ppmV from collection <br /> point V5-4'. Collection point V6-4' identified the second highest total BTEX soil vapor <br /> concentration at 0.804 ppmV. Trace levels of total BTEX soil vapors were identified from V2-4' <br /> and V34' as 0.012 ppmV and 0,021 ppmV, respectively. Collection points V1-4', V4-4', V7-4', <br /> V8-4', and V9-4' identified no detectable concentrations of soil vapor as total BTEX (See Figure <br /> 5 for BTEX Concentrations and Appendix C for Laboratory Analysis Results), <br /> Soil vapor MTBE concentrations were identified in two collection points, V5-4' and V6- <br /> 4', exclusively. Soil vapor MTBE concentrations from V5-4' were identified as 44 ppmV and <br /> MTBE concentrations from V6-4' were identified as 2.7 ppmV. MTBE concentrations were <br /> confirmed from V5-4' and V6-4' using GCMS and identified MTBE as 14 ppmV and 16 ppmV, <br /> respectively. See Figure 6 for MTBE Concentrations and Appendix C for Laboratory Analysis <br /> Results. Soil vapor results from collection points VS-4' and V6-4' support that previous leakage <br /> ' occurred on the north side of the former USTs. <br /> On February 4, 2000, BEII contracted Del-Tech to collect groundwater samples from <br /> or laboratory analysis. Groundwater parameters (pH, <br /> monitoring wells MW-1 through MW-11 f <br /> 1 <br />