ARCHIVED REPORTS XR0011244 - Laserfiche WebLink

Home Browse Search

r. Jq Deep Wells At the time of the second quarter 2004 monitoring event, groundwater was encountered in the deep monitoring wells at depths ranging from 48 68 to 50 53 feet bgs Groundwater elevations had increased between 0 03 and 0 35 feet in deep wells MW-8, MW-9, and MW-11, and decreased 0 76 feet in well MW-10 since the previous monitoring event (February 23, 2004) Groundwater monitoring data were normalized to MSL and used to prepare a groundwater elevation contour map (Figure 6) The groundwater flow during the second quarter 2004 was toward the east at a gradient of 0 012 ft/ft Groundwater flow in the deep wells has historically been toward the south and east In the deep wells, TPHG and benzene were reported in wells MW-8 and MW-9 The highest concentration of TPHG (130,000 pg/L) and benzene (1,100 Pg/L) were reported in well MW-9 TBA was reported in wells MW-8 (110 Pg/L) and MW-17 (20 Pg/L) 1,2-DCA was reported in wells MW-11 (1 6 Pg/L) and MW-17 (6 6 gg/L) MTBE, DIPS, ETRE, TAME, or EDB were not reported in any of the deep wells These analytical results are generally consistent with historical data TPHG, benzene, and MTBE concentrations for samples collected and analyzed during the second quarter 2004 are included on Figure 7 Tentativelv Identified Compounds SJCEHD has requested that all peaks detected in the analyses be reported A copy of the laboratory tentatively identified compounds (TIC) report is attached Tentatively identified compounds were reported for wells MW-7, MW-8, MW-9, MW-18, VEW-1, and VEW-2 Results of the TIC analysis are summarized in Table 3 ATTACHMENTS • Table 1 Groundwater Elevation and Analytical Summary • Table 2 Groundwater Analytical Results for Oxygenates and Additional Compounds • Table 3 Summary of TIC Analysis Results • Figure 1 Site Location Map • Figure 2 Groundwater Elevation Contour Map, Shallow Groundwater Wells (Second Quarter 2004) • Figure 3 Groundwater Analytical Summary, Shallow Groundwater Wells (Second Quarter 2004) • Figure 4 Groundwater Elevation Contour Map, Mid-Depth Groundwater Wells (Second Quarter 2004) • Figure 5 Groundwater Analytical Summary, Mid-Depth Groundwater Wells (Second Quarter 2004) • Figure 6 Depth to Groundwater, Deep Groundwater Wells (Second Quarter 2004) • Figure 7 Groundwater Analytical Summary, Deep Groundwater Wells (Second Quarter 2004) • Appendix A Field Data Sheets • Appendix B Sampling and Analysis Procedures • Appendix C Certified Analytical Reports and Chain-of-Custody Documentation p)Apache Piastics\Quarterty reports120041Apache_2Q04 DOC 5TkATUS