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HISTORICAL SUMMAR NALYTICAL RESULTS <br /> GRO TER <br /> FOOTHILL SAIGWMY LANDFILL <br /> MW-3 <br /> Units:mg/l,unless noted <br /> Sample Designation MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 <br /> Sampling Date 4/1/99 717/99 10/20/99 3/8/00 5/11/00 7/13/00 1/22/04 1/15/01 4/30/01 8/2/01 10/29/01 2/6/02 4/30/02 8/1/02 10/14/02 1/29/03 5/30/03 <br /> Monitoring and Field Parameters <br /> General Water Quality Parameters <br /> Temperature(°C)(field) 19.3 24.6 21.5 17.3 20.5 21.7 20 23.7 19.3 20.8 19.1 16.9 18.8 20.6 20.3 16.1 21.3 <br /> Chloride 13 7.1 9.61 9.7 9.73 9.6 9.96 12 9.76 9 11 12 9.3 10 11 11 NM <br /> Nitrate-Nitrogen 4.1 2.9 3.5 3.21 3.45 3.36 3.5 3.64 3.48 3 3.5 4 3.5 3.8 3.2 3.8 NM <br /> Total Dissolved Solids 179 213 220 202 204 188 196 191 199 200 220 190 200 190 210 190 NM <br /> Sulfate 5.1 1.9 6.57 7.24 6.98 7.62 7.19 7.66 7.00 6.9 8.8 10 6.4 6.7 6.2 7 NM <br /> pH(std units)(field) 7.77 7.41 7.9 7.36 7.8 8.23 7.41 7.01 6.6 7.11 6.36 6.8 6.94 7.06 6.72 6.69 7.58 <br /> Electrical Conductivity(umhos/cm), 268 271 270 264 273 272 272 316 600 190 610 210 290 300 250 377 273 <br /> Turbidity(NTU)(field) 1.3 1.01 >200 3.3 0.33 0.55 0.21 2.35 12.1 7.2 17.1 6.3 3.7 3.7 6.7 3.1 0.6 <br /> Calcium NM 21 <br /> Potassium NM 2.9 <br /> Magnesium NM 11 <br /> Sodium NM 15 <br /> Volatile Organic Compounds <br /> Trichloroethene(TCE) <0.89 <0.89 <0.06 0.227* 0.652 0.285* 0.323* 0.717 0.435* 0.065* 0.097* <0.18 <0.06 <0.06 <0.2 <0.36 NM <br /> 1,1-Dichloroethene <0.72 <0.72 <0.04 <0.04 0.285* 0.0795* 0.0688* 0.316* 0.217* <0.06 <0.06 <0.12 <0.06 <0.06 <0.2 <0.24 NM <br /> Chloroform <0.83 <0.83 <0.06 <0.07 <0.06 <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <0.18 <0.07 <0.07 <0.3 <0.37 NM <br /> Benzene <1.0 <1.0 <0.04 <0.05 <0.04 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.14 <0.05 <0.05 <0.20 <0.28 NM <br /> m/p•Xylene <0.78 <0.78 <0.21 <0.21 <0.21 <0.21 <0.21 <0.21 <0.21 <0.21 <0.21 <0.24 <0.21 <0.21 <0.20 <0.38 NM <br /> Chlorobenzene <0.90 <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <0.16 <0.07 <0.07 <0.2 <0.32 NM <br /> Methylene Chloride <0.03 2.43 <0.03 <0.06 <0.06 <0.06 <0.06 <0.06 <0.06 {1.9) <0.06 <0.06 <0.3 <0.23 NM <br /> Acetone 2.03* <1.79 <1.79 <1.79 <1.79 <1.8 <1.8 f4.4*1 <1.8 <1.8 <2.0 <0.52 NM <br /> Napthalene <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.46 <0.1 <0.10 <0.3 <0.93 NM <br /> Methyl ter-butyl ether <0.08 <0.08 <0.08 <0.18 <0.08 <0.08 1.4 <0.36 NM <br /> Toluene <0.07 <0.07 <0.07 <0.16 <0.07 <0.07 <0.2 <0.32 NM <br /> 1,4-Dichlorobenzene 0.18* <0.11 <0.23 <0.11 <0.11 0.8 <0.46 NM <br /> Tetrachloroethene 0.086* <0.08 <0.22 <0.08 <0.08 <0.3 <0.44 NM <br /> 2-Butanone <0.70 <0.65 <0.70 <0.70 <2.0 <0.14 NM <br /> 13-Dichloropropane <0.20 <0.09 <0.09 <0.2 <0.40 NM <br /> Chloromethane <0.14 <0.3 <0.18 NM <br /> 1 2 4-Trimethylbenzene NM <br /> 1 3 5-Trimethylbenzene NM <br /> Constituents of Concern Parameters <br /> Semivolatile Organic Compounds(EPA Method 3520/8270) <br /> All Compounds NR NR ND NR NR NR NR NR NR NR NR NR NR NR NR NR NR <br /> Organochlorine Pesticides and Polychlorinated Biphenvl's <br /> (EPA Method 3510/8080) <br /> All Compounds NR NR ND NR NR NR NR NR NR NR NR NR NR NR NR NR NR <br /> =Trace Concentration <br /> (i)This analytical result appears to be anomalous and therefore was not used in statistical evaluation procedures. <br /> (1)Parameter also detected in one or more quality control blanks <br /> NO=Not Detected <br /> NM=Not Measured <br /> NR=Not Required <br /> MW-3;Printed:7/15/2005 13 of 28 <br />