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0 <br /> Organic Concentration Limits vs.Second Quarter 2007 Sampling Event Results <br /> Forward Landfill <br /> MW-1 MW-2A MW-3 MW-10 <br /> Parameter MDL Ma -07 CLGB Bl PQL Ma -07 CLGB Bl PQL May-07 CLGB BL PQL May-07 CLGB BL PQL <br /> 1,1,1,2-Tetrachloroethane 0.19 <0.50 0.50 <0.50 0.50 <0.50 0.50 <0.50 0.50 <br /> 1,1,1-Trichloroethane 0.27 <0.50 0.50 <0.50 0.50 <0.50 0.50 <0.50 0.50 <br /> 1,1,2,2-Tetrachloroethane 0.22 <0.50 0.50 <0.50 0.50 <0.50 0.50 <0.50 0.50 <br /> MEN <br /> 1,2,3 Trichloropropane 0.42 <1.0 1.0 <1.0 1.0 <1.0 1.0 <1.0 1.0 <br /> 1,2,4-Trichlorobenzene 0.18 <0.50 0.50 <0.50 0.50 <0.50 0.50 <0.50 0.50 <br /> 1,2-Dibromo-3-Chlor 0.37 <1.0 1.0 <1.0 1.0 <1.0 1.0 <1.0 1.0 <br /> 2-Hexanone 1.7 <20 20' <2020' <20 20* <20 20` <br /> 4-Methyl-2-Pentanone 3.6 <10 10* <10 10' <10 10* <10 10* <br /> Acetone 6.2 <10 10' <10 10' <10 10` <10 10* <br /> MINME <br /> Bromodichloromethane 0.13 <0.50 0.50 <0.50 0.50 <0.50 0.50 <0.50 0.50 <br /> Bromofor n 0.22 <0.50 0.50 <0.50 0.50 <0.50 0.50 <0.50 0.50 <br /> Carbon Disulfide 0.24 <1.0 1.0' <1.0 1.0* <1.0 1.0" <1.0 1.0' <br /> Chloroform 0.098 <0.50 0.50 <0.50 0.50 <0.50 0.50 <0.50 0.50 <br /> cis-1,2-Dichlomethylene 0.13 <0.50 0.50 <0.50 1.5 <0.50 0.50 <0.50 0.50 <br /> cis-1,3-Dichloropropene 0.077 <0.50 0.50 <0.50 0.50 <0.50 0.50 <0.50 0.50 <br /> Ethanol 57 <250 250' <250 250* <250 250` <250 250' <br /> Ethylbenzene 0.094 <0.50 0.50 <0.50 0.50 <0.50 0.50 <0.50 0.50 <br /> Ethyltertiary Butyl Ether 0.32 <0.50 0.50' c0.50 0.50° <0.50 0.50* <0.50 0.50* <br /> Methyl Bromide 0.31 <1.0 <br /> Methyl Chloride 0.072 <0.50 0.50 <0.50 0.50 <0.50 0.50 <0.50 0.50 <br /> Ail 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 not analyzed this event. <br /> 0.75-May 2007 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 /> HERST & ASSOCIATES, INC. <br />