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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> GROUNDWATER <br /> FOOTHILL SANITARY LANDFILL <br /> MW-3 <br /> Units:mi/l,unless noted <br /> pie Designation MW-3 - - -3 -3 -3 MW-3 MW-3---MW--T <br /> Samplln2 <br /> -3 - <br /> Sampiing Date 1/16/95 4/20/95 7/6/95 10/11/95 1/4/96 4/2/96 7/9/96 10/2/96 1/16/97 4/10/97 7/10/97 10/3/97 3/11/98 4/30/98 7/7/98 10/9/98 1/15/99 <br /> Monitorina and Field Parameters <br /> General Water Quali!y Parameters <br /> Temperature(°C)(field) 18.1 19.8 21.5 22.5 18.4 20.8 22.5 21.3 17.1 25.3 24 22.2 20.17 21.8 23.8 20.6 17.7 <br /> Chloride 10 8.6 9 9 9 9 9 9 7.3 7.5 7 8.7 11 11 10 10 10.2 <br /> Nitrate-Nitrogen 3.6 3.8 3.7 3.5 3.3 3.9 3.3 4.1 3 3.6 2.6 3.3 3.9 4.2 4.2 4.2 0.23 <br /> Total Dissolved Solids 230 22 179 260 250 250 230 230 230 178 220 246 216 215 229 198 173 <br /> Sulfate [28 4.3 5 6 6 5 6 6 4.9 4.5 5 5.5 6 6.1 6.2 6 6.8 <br /> p (std.units)(field) 7.74 7.83 7.80 7.62 7.81 7.48 7.49 7.34 8.68 7 7.08 7.8 7.81 7.72 8.18 7.5 8.28 <br /> Electrical Conductivity(umhos/cm) 304 275 295 286 294 277 289 275 460 238 266 267 242 277.3 271 2 272 <br /> Turbidity(NTU)(field) 100.6 140 136 68 42 120.3 58.0 65.1 2.3 2.1 1.98 19.38 0.8 18.7 2.5 15.1 L W <br /> Calcium <br /> Potassium <br /> Magnesium <br /> Sodium <br /> Volatile Organic Compounds(ug/I) <br /> Tnchioroethene(TCE) 0.9 <0.43 <0.4 <0.4 0.5* <0.4 <0.4 0.7 <0.5 0.86 <0.4 <0.89 <0.89 <0.89 <0.89 <0.89 4.0 <br /> 1, -Dichloroet ene <0.4 <0.4 <0.4 0.29* <0.4 <0.72 <0.72 <0.72 <0.72 <0.72 4.0 <br /> Chloroform <0.83 <0.83 <0.83 <0.83 2.6 <0.83 <0.83 <0.83 <0.83 <0.83 <0.83 <br /> Benzene <br /> 4.2 <br /> m/p- Y ene 1.5 <br /> Chlorobenzene <br /> 4.0 <br /> Methylene Chloride <br /> Acetone <br /> Napt a ene <br /> Methyl ter-butyl ether <br /> Toluene <br /> 4.1 <br /> 1,4- ich oro enzene <br /> Tetrachloroethene <br /> 2-Butanone <br /> 3- ichloropropane <br /> Chloromethane <br /> 1,2,4-Trimet ylbenzene <br /> 1,3,5-Trimethylbenzene <br /> Constituents of Concern Parameters <br /> Semivolatile Organic Compounds <br /> (EPA Method 3520/8270) <br /> All Compounds NP NR N R NR NR NR NR NR NR , NR NR NR NR NR NR NR <br /> Organochlorine Pesticides and Polvchlorinated Biphenvl's <br /> (EPA Method 3510/8080) <br /> All Compounds NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR <br /> Trace Concentration <br /> [1]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 /> ND=Not Detected <br /> NM=Not Measured <br /> NR=Not Required <br /> MW-3;Printed:1/30/2004 19 of 28 <br />