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Organic Concentration Limits vs.First Quarter 2006 Sampling Event Results <br /> Forward Landfill <br /> MW-1 Mw-2A MW-3 1101w-10 <br /> Parameter MDL Jan-06 CLGB BL PQL Jan-06 CLGB BL PQL Jan-06 CLGB BL PQL Jan-06 CLGB BL PQL <br /> 1,1,1,2-Tetrachloroethane 0.18 <0.50 0.50 <0.50 0.50 <0.50 0.50 <0.50 0.60 <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 /> 7s <br /> a <br /> .., r ro .� 0.46 <1.0 .. 1.0 <1.0.... _ 1.0 <1.0 1.0 <1.0 1.0 <br /> 1,2,3-Trichlo op pa <br /> 1,2,4-Trichlorobenzene 0.16 <0.50 0.50 <0.50 0.50 <0.50 0.50 <0.50 0.50 <br /> 1,2-Dibromo-3-Chloropropane 0.69 <1.0 1.0 <1.0 1.0 <1.0 1.0 <1.0 1.0 <br /> �Q , <br /> 2-Hexanone 18 <20 20' <20 20' <20 20' <20 20' <br /> 4-Methyl-2-Pentanone 2.0 <20 20' <20 20' <20 20' <20 20' <br /> Acetone 6.2 <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' <1.0 1.0' <1.0 1.0' <1.0 1.0' <br /> q at 9 wup"t <br /> Chloroform 0.11 <0.50 0.50 <0.50 0.50 <0.50 0.50 <0.50 0.50 <br /> cis-1,2-Dichloroethylene 0.19 <0.50 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 <0.50 050 <br /> MONSOON <br /> Di < Munklon <br /> r k <br /> D1. u <br /> Ethanol 110 <1000 1000' <1000 1000' <1000 1000' <1000 low <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' <br /> <0.50 0.50` <0.50 0.50' <0.50 0.50' <br /> 1 <br /> Methyl Bromide 0.21 <1.0 1.0' <1.0 1.0' <1.0 1.0' <br /> Methyl Chloride 0.17 <0.50 0.50 <0.50 0.50 <0.50 0.50 <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 not analyzed this event. <br /> 0.75-January 2006 concentration exceeds the CLGB,BL,or PQL. <br /> NS-Well was not sampled. Pump at MW-17 was riot functional during the first quarter 2006. <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 />