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f 3 DISCUSSION ' TPHG was detected in samples collected from wells MW-1 (12,000 µg/L), MW-4 (540 pg/L), VW-1B \ 090 µglL), and VW-2B (310 pg/L) The laboratory report noted that the TPHG hydrocarbon pattern detected in wells MW-4, and VW-113 did not resemble the TPHG pattern BTEX compounds were also detected in the sample collected from well MW-1 MTBE was detected in the samples collected from wells MW-1 (17,000 pg/L), MW-2 (2 0 pg/L), MW-4 (2,900 µg/L), VW-IB (320 pg/L), VW-2B (370 µg/L), and VW-3B (1,500 pg/L) TAME (1 5 pg/L) and 1, 2-DCA (16 pg/L) were detected in the sample collected from well VW-113 Petroleum hydrocarbons or fuel oxygenates were not detected in samples collected from monitoring wells MW-3, MW-5, MW-6, or MW-7 These analytical results are consistent with previous sampling events Groundwater flow directions during the second quarter 2002 were calculated to be towards the east- northeast at gradients ranging from 0 0023 to 0 0024 ft/ft East, northeast, and southeast groundwater flow directions have been reported since groundwater monitoring was initiated in 1995 At the time of the second quarter sampling event (June 19, 2002), groundwater elevations had increased approximately 3 feet in the monitoring wells since the previous sampling event (March 14, 2002) ATTACHMENTS • Table 1 Groundwater Monitoring Data • Table 2 Groundwater Analytical Results for Oxygenates • Table 3 Groundwater Elevation Data • Figure 1 Site Location Map • Figure 2 Groundwater Elevation Contour Map, April 8, 2002 (Second Quarter 2002) • Figure 3 Groundwater Elevation Contour Map, June 19, 2002 (Second Quarter 2002) • Figure 4 Groundwater Analytical Summary(Second Quarter 2002) • Appendix A Field Data Sheets • Appendix B Sampling and Analysis Procedures o Appendix C Certified Analytical Reports and Cham-of-Custody Records C� P\Bp-Arco for URS\2186\Quarterky\2002\Arco_21 86_2QO2 doe