Laserfiche WebLink
• DISCUSSION <br /> In the uppermost portion of the water-bearing zone, petroleum hydrocarbons were detected in the <br /> samples collected from wells MW-1 through MW-7 The laboratory report noted that the TPHG <br /> hydrocarbon pattern detected in well MW-7 did not resemble the TPHG pattern The highest TPHG <br /> concentration (34,000 pg/L) was detected in the sample collected from well MW-6, and the highest <br /> benzene concentration (5,400 pg/L) was detected in the sample collected from well MW-3 Benzene (3 6 <br /> and 12 pg/L, respectively) were detected in the samples collected from both mid-depth wells MW-1 B and <br /> MW-813 Benzene (4 8 and 6 8 gg/L, respectively), was also detected in the samples collected from <br /> deepest screened wells MW-1C and MW-8C MTBE was detected in the samples collected from wells <br /> MW-1 (24 pg/L) and MW-8C (0 54 pg/L) 1,2-DCA was detected in the samples collected from wells MW- <br /> 1, MW-1B, MW-1C, MW-2 through MW-6, MW-8, and MW-8B TBA was detected in samples collected <br /> from wells MW-1 (110 pg/l_), MW-1 B (6 6 pg/L), and MW-2 (33 pg/L) Concentrations of petroleum <br /> hydrocarbons and fuel additives detected during the second quarter 2002 sampling event are generally <br /> consistent with previous analytical results <br /> The groundwater flow direction in the uppermost water-bearing zone for June 13, 2002, was calculated to <br /> be towards the east-southeast at an average gradient of 0 0018 ft/ft Groundwater elevations in the <br /> monitoring wells decreased approximately 0 19 to 0 46 feet since the previous sampling event (February <br /> 2001) <br /> ATTACHMENTS <br /> • Table 1 Groundwater Monitoring Data <br /> • Table 2 Groundwater Analytical Results for Oxygenates <br /> • Table 3 Historical Groundwater Flow Direction and Gradient <br /> • Figure 1 Site Location Map <br /> • Figure 2 Groundwater Elevation Contour Map (Second Quarter 2002) <br /> • Figure 3 Groundwater Analytical Summary Map (Second Quarter 2002) <br /> • Appendix A Field Data Sheets <br /> • Appendix B Sampling and Analysis Procedures <br /> • Appendix C Certified Analytical Reports and Chain-of-Custody Records <br /> P\Bp-Arco for URS\2168\Quarterly\2002\Arco_2168_2Q02 doc <br />