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' Report of Findings 0 Frontier Transportation ' August 26, 2003 Page 3 beneath the site ' ' 4.0) SITE ASSESSMENT RESULTS ' On June 26, 2003, BEH supervised the installation of deep groundwater monitoring well (MW-14) to help define the extent of dissolved petroleum hydrocarbons beneath the site (See ' Figure 2 for well locations)-""Monitoring well MW-14 was advanced to 40' bg'JAn 8-inch outside and 4 25-inch inside diameter hollow stem auger was used to install the monitoring well The new groundwater monitoring well was constructed of schedule 40 PVC casing The screen ' slots were sized at 0 01-inch with a size #2/16 sand annular pack The well was screened from 30' to 40' bg and the sand annular pack extended from 28'bg to 40'bg -The annular seal was seven feet thick and consisted of bentonite pellets The remaining annular space was grouted to ' surface (See Appendix A for well construction) Soil samples were collected at 5-foot intervals from a split spoon sampler that contains ' three brass liners, which are 2 inches in diameter and 6 inches long Soil samples were screened for petroleum hydrocarbons in the field using a PID A total of eight (8) soil samples were . collected from newly installed monitoring well MW-14, which were analyzed for TPH-g, BTEX, and MTBE using EPA methods 8015M and 8021B Soil samples that identified detectable MTBE concentrations by 8021B were confirmed using EPA method 8260B J ' Laboratory analysis results identified MTBE in soil at 5' bg and 10' bg, exclusively(See Table 1 for Soil Sample Results and Appendix B for Laboratory Analytical Reports) MTBE was`" identified as 120 µg/Kg at 5' bg using EPA method 8021B Confirmation was performed using — ' 8260B and identified MTBE as 106 µg/Kg at 5' bg /No detectable concentrations of TPH-gas or BTEX were identified from MW-14 at 5' bg rSoil collected from MW-14 at 10' bg identified ' MTBE as 1,560 µg/Kg using EPA metfiod 8021B (MTBE confirmation using EPA method_ 8260B identified 1,020 µg/Kg at 10' bg No detectable concentrations of TPH-gas or BTEX were identified from MW-14 at 10' bg—All remaining six (6) soil samples identified no detectable concentrations of TPH-gas, BTEX, or MTBE - 1 A groundwater sample from monitoring well MW-14 was collected by BEII on August 2, 2003 Three well volumes were purged from the well prior to groundwater sample collection t , The sample was analyzed for TPH-diesel, TPH-gas, BTEX, and MTBE using EPA methods \ 8015M, 8021B, and 8260B Laboratory analysis identified dissolved TPH-gas and MTBE exclusively in monitoring well MW-14 Dissolved TPH-gas was identified as 297 µg/L and I dissolved MTBE as 286 L EPA method 8260B See Appendix �r µg/ { ) ppend C for laboratory analysis i— report of groundwater sample , a 1 yl