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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> GROUNDWATER <br /> FOOTHILL SANITARY LANDFILL <br /> W-2 <br /> Units:mg/I,unless noted <br /> Sample Designation MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 <br /> Sampling Date 1/5/94 4/5/94 7/5/94 11/28/94 1/16/95 4/21/95 7/6/95 10/11/95 1/5/96 4/2/96 7/9/96 10/2/96 1/16/97 4/10/97 7/10/97 10/3/97 3/11/98_ <br /> Monitoring and Field Parameters <br /> General Water Quality Parameters <br /> Chloride 8 5 6 6.6 6 5.16 6 6 6 6 6 5 4.7 4.9 7.2 8.2 <br /> Nitrate-Nitrogen 1.3 2.0 1.6 2.9 2.9 3.0 -2.8 2.6 2.5 2.9 2.6 3.3 2.5 2.8 3 2.8 3.9 <br /> _Total Dissolved Solids 190 200 190 162 180 170 130 200 200 220 220 180 210 199 180 204 183 <br /> Sulfate <8 <8 <8 1.5 trace 1.1 trace trace <0.7 <0.7 2 2 1.4 1.4 1.4 1.8 1.9 <br /> __pH(std units fief�_- _ 7.52 _7.35 7.56 7.76 7.79 7.66 7._55 - 7.75 8.30 7.31 7.50 _6.95 _8.73 7.25- 7.84 7_69 7.55 <br /> Electrical Conductivity(umhos/cm 250 u 230 234 242 230 -196 212 225 201 200 207 201 870 415 130 217 176 <br /> Turbidity(NTU)(field) _ NR_ NR NR 4.2 2.2 8__ 18 10 7 6.8 5.1 10.5 3.4 2.8 2.42 40 1.2 <br /> Temperature(°C)(rieid) _ NR NR NR 15.7 16.7 20.1 22.4 22.0 19.7 20.6 21.9 20.8 14.1 24.4 22.7 _ 21.5 20.4 <br /> Calcium _ __ _ _ <br /> Potassium <br /> Sodium <br /> Magnesium _ <br /> Volatile Organic Compounds(ug/I) <br /> Methylene Chloride <br /> Trichloroethene(TCE) <0.89 <0.89 <br /> 1,1-Dichloroethene <br /> <0.72 <0.72 <br /> Chloroform <br /> <0.83 <0.83 <br /> Chiorobenzene <br /> Acetone <br /> Napthalene <br /> Methyl ter-butyl ether <br /> Toluene ----- ---- - -- - --- <br /> 1,4-Dichlorobenzene -- --------- - -- - ------ - - - - - ------ <br /> Tetrachloroethene <br /> 2-Butanone <br /> 1 3-Dichioropropane <br /> Chloromethane <br /> 1,2,4-Trimethyibenzene <br /> 1 3 5-Trimethyibenzene <br /> Constituents of Concern Parameters <br /> Semivolatile Organic Compounds <br /> (EPA Method 3520/8270) <br /> All Compounds NR NR NR ND 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 NR ND 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-2;Printed:7/8/03 11 of 24 <br />