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New Historical Intrawell Maximum Values <br /> New Max. Previous Max. <br /> Well Analyte_____ Result Result <br /> MW-1B 11-Dichloroethane 11-DCA 0.41' 0.25" <br /> cis-12-Dichloroethene cis-1,-DCE 0.29' ND <br /> Dichlorodifluoromethane CDFM 0.32' 0.21' LL <br /> I 91L <br /> PCE 0.60' 0.32' <br /> WE 0.56' 0.25' <br /> Trichlorofluoromethane TCFM 0.30' 0.28' <br /> MW-15 1,1-DCA 0.19' ND <br /> DCDFM 0.23' ND <br /> TCFM 0.23' ND <br /> MW-16 Nitrate-N 36 m 26 m <br /> Sulfate 64 m 48 mg/L <br /> PCE 0.18' 0.17' <br /> MW-17 Methyl Ethyl Ketone 2.4 ND <br /> TCFM 0.45' ND <br /> MW-18 Chromium,Hexavalent 0.017 TgIL 0.0088 mg/L <br /> MW-21 di-Isopropylether 0.32' ND <br /> Notes: ND—Not Detected. <br /> j—Trace Value(between the MDL and PQL). <br /> Concentration Limit Thresholds <br /> Data obtained during the second 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 second quarter 2006. As summarized in this table, CLs were exceeded <br /> for wells MW-1B,MW-2A,MW-3B,MW-10,MW-13,MW-14, MW-15,MW-16, <br /> MW-17, MW-18,.MW-19, and MW-21. In accordance with the RPCMP,wells with <br /> exceedances of concentration limits (other than arsenic,bicarbonate,hexavalent <br /> chromium,nitrate as nitrogen, and sulfate)will be resampled in August during the third <br /> quarter 2006 sampling event and a second independent sample will be collected in <br /> September 2006. The results of the retesting events will be submitted to DTSC and <br /> RWQCB under 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—80 to—30 centibars on May 22, <br /> 2006. On June 8, 2006, the lysimeters were again checked and positive pressure was <br /> applied to evacuate the accumulated sample. As recorded in the field notes for lysimeters <br /> (Appendix C) and summarized on Table 2-5, only lysimeter LY-BGl had soil-pore <br /> liquid. However, the volume was less than 40 mL, an insufficient volume for analysis. <br /> D:N2003021%YorwardAustin_sp06.doe <br /> 7 Geologic Associates <br />