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inorganic parameters. Excluding confirmed laboratory contaminants, one or more trace- <br /> level VOCs were measured in the samples collected from wells MW-10, MW-14, and <br /> MW-21. In addition, tetrachloroethene(PCE)was measured above the PQL in the <br /> sample collected from well MW-14. On behalf of Forward Inc., GLA prepared a letter <br /> report dated February 14, 2001 (RWQCB Case No. 2209),to assess the source and <br /> potential impacts of low-level VOCs in groundwater adjacent to the Forward Landfill. <br /> The letter report concluded that the sporadic detection of low-level VOCs in groundwater <br /> and lysimeter samples at the Forward Landfill are most likely due to landfill gas from <br /> unlined unit WMU-B. Forward has continued to minimize gas related impacts to <br /> groundwater by minimizing interim fill areas that promote ponding of water. <br /> Furthermore, in accordance with CCR Title 27, Section 20937, Forward continues to <br /> install additional landfill gas extraction wells. <br /> New Historical Intrawell Maximum Values <br /> As shown in the following table, the results of the third quarter 2006 monitoring period <br /> indicate that 15 new historical intrawell maximum values were measured, including <br /> seven first-time VOC detections, in samples collected from groundwater monitoring <br /> wells. However, all of the first-time VOC detections are confirmed laboratory <br /> contaminants. <br /> New Historical Intrawell Maximum Values <br /> New Max. Previous Max. <br /> Well Analyte Result Result <br /> MW-2A Dibromochloromethane* 0.21' ND <br /> MW-3 Chloride 120 m 118 m <br /> Barium 0.25 0.24' <br /> Calcium 120 m 110 m <br /> Magnesium 58 m 54 m <br /> Sodium 86 m 84 m <br /> Dibromochloromethane* 0.24' ND <br /> MW-10 Bromoform* 1.4 ND <br /> Dibromochloromethane* 0.19' ND <br /> MW-18 Bromoform* 1.8 ND <br /> Dibromochloromedme* 0.63 0.17' ILgAL <br /> MW-19 Bromoform* 1.8 mAL ND <br /> Dibromochloromedme* 0.7 gp <br /> A ND <br /> MW-21 Bicarbonate 1000 MEA 930 m <br /> di-Isopropylether 1 0.41' 0.32' <br /> Notes: ND—Not Detected <br /> j—Trace Value(between the MDL and PQL) <br /> *—Confirmed Laboratory Contaminant <br /> Concentration Limit Thresholds <br /> Data obtained during the third 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 /> D:X2003_021NForwardAnstin_sam06.doc <br /> 6 Geologic Associates <br />