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Organic Concentration Limits vs.Second Quarter 2006 Sampling Event Results <br /> Forward Landfill <br /> MW-1 MW-2A MW-3 MW-10 <br /> Parameter MDL May-06 CLGB BL PQL May-06 I CLGB BL PQL May-08 CLGB I BL PQL Ma -06 CLGB I BL PQL <br /> 1,1,1,2-Tetrachloroethane 0.18 <0.50 0.50 <0.50 0.50 <0.50 0.50 <0.50 0.50 <br /> 1,1,1-Trichloroethane 0.16 <0.50 0.50 <0.50 0.50 <0.50 0.50 <0.50 0.50 <br /> 1,1,2,2-Tetrachloroethane 0.23 <0.50 0.50 <0.50 0.50 <0.50 0.50 <0.50 0.50 <br /> 1,2,3-Trichloropropane 0.46 <1.0 1.0 <1.0 1.0 <1.0 1.0 <1.0 1.0 <br /> 1,24-Trichloroben zene 0.16 <0.50 0.50 <0.50 0.50 <0.50 0.50 <0.50 0.50 <br /> 1,2-Dibromo-3-Chioropropane 0.69 <1.0 1.0 <1.0 1.0 <1.0 1.0 <1.0 1.0 <br /> 2-Hexanone 18 <20 .20" <20 20* <20 20* <20 20* <br /> 4 Methyl-2 Perdarwne 2.0 <20 20* <20 20` <20 20` <20 20* <br /> Acetone 6.2 <br /> <10 10* <10 10* <10 10` <10 10* <br /> Bromodichloromethane 0.12 <0.50 0.50 <0.50 0.50 <0.50 0.50 <0.50 0.50 <br /> Bromoform 0.33 <0.50 0.50 <0.50 0.50 <0.50 0.50 <0.50 0.50 <br /> Carbon Disulfide 0.38 <1.0 1.0* <br /> Chloroform 0.11 <0.50 0.50 <0.50 0.50 <0.60 0.50 <0.50 0.50 <br /> cis-1,2-Diichloroethylene 0.19 0.29** 0.50 <0.50 1.5 <0.50 0.50 <0.50 0.50 <br /> cis-1,3-Dichloropropene 0.13 <0.50 0.50 <0.50 0.50 <0.50 0.50 <0.50 0.50 <br /> Ethanol 110 <1000 1000* <1000 1000` <1000 1000* <1000 1000* <br /> Ethylbenzene 0.13 <0.50 0.50 <0.50 0.50 <0.50 0.50 <0.50 0.50 <br /> Ethyltertiary Butyl Ether 0.27 <0.50 0.50* <0.50 0.50* <0.50 0.50* <0.50 0.50* <br /> Methyl Bromide 0.21 <1.0 1.0* <1.0 1.0* <1.0 1.0* <1.0 1.0* <br /> Methyl Chloride 0.17 <0.50 0.50 <0.50 1 1 0.50 <0.50 10.50 <0.50 0.50 <br /> All concentrations are provided in ug/L. <br /> MDL-Method Detection Limit from current laboratory analytical report. <br /> CLGB-Concentration Limit Greater Than Background(Impact Constituents only). See Table 5-12 of Revised Post-Closure Maintenance Plan(11/2/94). <br /> BL-Background Limit. Determined from historical data at MW-20 and MW-23R.(Mean+(2.375 x Standard Deviation]) <br /> PQL-Practical Quantitation Limit from current laboratory report. <br /> NS-Constituent rot analyzed this event <br /> 0.75-May 2006 concentration exceeds the CLGB,BL,or PQL. <br /> *-No historical detections above the PQL in MW-20 or MW-23R. Background limit is equal to the PQL. <br /> **-Constituent concentration is between the MDL and PQL. <br /> t-No historical detections above the PQL in MW-20 or MW-23R. Constituent not analyzed this event, Background limit will be equal to the PQL when constituent is analyzed. <br /> Page 1 of 8 <br /> )1E,RST & ASSOCIATES, INC. <br />