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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> GROUNDWATER <br /> FOOTHILL SANITARY LANDFILL <br /> MW-2R <br /> Units:mg/l,unless noted <br /> Sample DesignationMW-2R MW-2R <br /> Sampling Date 8/13/03 1/21/04 <br /> Monitoring and Field Parameters <br /> General Water Qualily Parameters <br /> Temperature(°C)(field) 21.9 1 <br /> Chloride 6.7 7.1 <br /> Nitrate-Nitrogen 3. 3.1 <br /> ota Disso vedSolids 150 180 <br /> Sulfate 2.4 2.3 <br /> pH std.units eld) 6.58 7.1 <br /> Electrical CondUCt!VI umhos/cm) 203 284 <br /> u idi NTU ie 5.2 10.7 <br /> Ca cium 15 15 <br /> Potassium 1.4 2.4 <br /> Magnesium 8.6 7.6 <br /> sodium 12 11 <br /> Volatile QCgInig Qomoounds(ug/11 <br /> richioroethene CE <0.36 <0.36 <br /> 1,1-Dic oroethene <0.24 <0.24 <br /> Chloroform <0.3 <0.37 <br /> Benzene <0. <0.28 <br /> m/p- ene <0.38 <0.38 <br /> Chlorobenzene <0,32 <0.32 <br /> Methylene Chloride <0.23 <0.23 <br /> Acetone (0.90*) <0.52 <br /> l��a t a ene <0.93 <0.93 <br /> Methyl ter-butyl ether <0.36 <0.3 <br /> oluene <0.32 <0.32 <br /> 1, - i oro enzene <0.46 <0.46 <br /> etra loroethene <0.44 <0.4 <br /> 2-Butanone <0.14 <0.14 <br /> 1, - is loropropane <0.40 <0.40 <br /> hloromethane <0.1 <0.18 <br /> 1,2,4- rime benzene <0.18 <0,18 <br /> 1 - rimethyibenzene <0. <0.28 <br /> Constituents of Concern Parameters <br /> Semivolatile Organic Compounds <br /> (EPA Method 3520/8270) <br /> All Compounds NR NR <br /> Organochlorine Pesticides and'Poivchlorinated Biphenvi's <br /> (EPA Method 3510/8080) <br /> All Compounds 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-2R;Printed:7/26/2004 9 of 28 <br />