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New Historical Intrawell Maximum Values <br /> New Max. Previous Max. <br /> Well Analyte Result Result <br /> MW-2A Nitrate-N 11 m 6.6 m <br /> MW-14 1,1-DCA 0.27' 0.18' <br /> cis-1,2-DCE 0.28' 0.20' <br /> TCE 0.55' 0.53' <br /> MW-16 Nitrate-N 26 m 24 m <br /> MW-19 Calcium 200 140 <br /> Chloride 220 m 147 mg/L <br /> Oil and Grease 6.4 m ND <br /> Sodium 190 m 114 m L <br /> Sulfate 540 m L 322 m <br /> TDS 1600 m 900 m <br /> MW-22 Nitrate-N 20 m 19 m <br /> MW-23R Carbon Disulfide 0.57' ND <br /> Notes: ND—Not Detected. <br /> j—Trace Value(between the MDL and PQL). <br /> Concentration Limit Thresholds <br /> Data obtained during the first quarter 2006 monitoring period were compared to <br /> concentration limits(CLs) as specified in the RPCMP for the Forward Landfill. CLs <br /> were calculated by Herst&Associates and are included in Appendix D. Table 2-4 <br /> summarizes CLs that were exceeded in samples collected from groundwater monitoring <br /> wells during the first quarter 2006. As summarized in this table, CLs were exceeded for <br /> wells MW-lA,MW-2A, MW-3A,MW-10, MW-14,MW-16, MW-18, and MW-19. In <br /> accordance with the RPCMP,wells with exceedances of concentration limits(other than <br /> arsenic or hexavalent chromium)will be resampled in May during the second quarter <br /> 2005 sampling event and a second independent sample will be collected in June 2005. <br /> The results of the retesting events will be submitted to DTSC and RWQCB under <br /> separate cover. <br /> 2.1.5 Vadose Zone Monitoring <br /> The current vadose-zone monitoring network at the Forward Unit consists of 16 <br /> lysimeters. The lysimeter locations are shown on Figure 2-1. Each accessible lysimeter <br /> was inspected and vacuums were reset to approximately—18 to—52 inches of mercury on <br /> January 31 or February 1, 2006. On February 10, 2006, the lysimeters were again <br /> checked and positive pressure was applied to evacuate the accumulated sample. As <br /> recorded in the field notes for lysimeters (Appendix C) and summarized on Table 2-5, <br /> only lysimeter LY-BGl had soil-pore liquid. However, the volume was less than 40 mL, <br /> and therefore,no sample was collected. <br /> D:\2003_021\Forwa rdAustin_w06.doc\4/20/2006 <br /> 7 Geologic Associates <br />