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quantitation limit(PQL) in the samples collected from MW6A and MW-9A,respectively. <br /> As discussed in section 5.2, only trichlorofluoromethane(TCFM),is not a confirmed <br /> laboratory contaminants. Pursuant to Title 27 of the California Code of Regulations <br /> (27CCR) Section 20420 0)(1) and State Water Board Resolution 93-62, the RWQCB was <br /> notified in writing of the non-statistical indication of a release from well MW-9A and this <br /> well will be resampled within 30 days to evaluate the significance of the VOC detection. <br /> Well MW-6A will not be resampled since bromoform is a confirmed laboratory <br /> contaminant. <br /> Concentration Limits <br /> For DMP monitoring wells at the French Camp Landfill, concentration limits(CLs) are <br /> used for the water quality protection standards �WQPS). The CLs shown in Table 2 were <br /> calculated by Herst&Associates using Sanitas , a state-approved statistical software <br /> program,using historical data from background wells MW-6A and MW-7A, and are <br /> presented in Appendix D. Based on a comparison of the data obtained during the third <br /> quarter 2006 monitoring period, the following analytes were found to exceed a CL: <br /> CONSTITUENT Concentration DW Monitoring Wells <br /> I Undt jMW­6A*jMW-7A-j MW-8A I MW-9A I MW-9B I MW-10A <br /> 3ENERAL CHEMISTRY(mg/l,except as noted) <br /> 3arium 0.46 0.700 <br /> Mloride 260 420 <br /> 'H 7.915 9.2 9.4 <br /> otassium 1.8 3.3 2.1 <br /> romoform 0.33 1.3** <br /> bromocffloromct ane 0.14 0.44** 1 1 0.37** 0.23** <br /> nchlorufluommethane 0..20 2.9 <br /> _ <br /> NOTES: (*)-Background Well. <br /> (**)—Suspected Laboratory Contaminant <br /> Trend Analysis <br /> In order to evaluate changes in water quality in DMP wells at the French Camp Landfill, <br /> historical groundwater data were evaluated using Sen's Slope trend analyses to determine <br /> if significant increasing or decreasing trends were evident. Trend analyses,performed by <br /> Herst&Associates, are presented in Appendix D and summarized below. <br /> Well Number Increasing Trends DecreadAg Trends <br /> MW-6A None A <br /> manent None Apparent <br /> MW-7A None Aaarent Sulfate <br /> — MW-8A None Apparent Nitrate-N <br /> MW-9A Barium None Awanent <br /> MW-9B Sulfate Barium <br /> —MW-10A Chloride Nitrate-N <br /> As shown above, CLs were exceeded for one or more constituents in the samples <br /> collected from wells MW-6A, MW-9A, MW-9B, and MW-10A. However, none of the <br /> constituents that exceeded a CL exhibited a significant increasing trend. <br /> 1kU003021WC_=m06.doc <br /> 4 Geologic Associates <br />