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® ® r ® MM M M M M M <br /> HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> GROUNDWATER <br /> FOOTHILL SANITARY LANDFILL <br /> L -1 <br /> Units:mail unless noted - <br /> Sample Designation LW-1 LW-1 LW-1 LWA LW-1 <br /> Sampling Date 10/4/93 1/5/94 7/5/94 11/28/94 5/30/03 <br /> Quarterly Monitoring and Field Parameters <br /> Ceneral Water Quality Parameters <br /> Chloride 8 10 14 9.5 10 <br /> Nitrate-Nitrogen 1.1 1.1 1.1 1.2 1.3 <br /> Total Dissolved Solids 220 230 240 182 190 <br /> Sulfate 14 <8 16 15 16 <br /> PH(std.unite(field) 6.40 7.42 7.82 7.68 7.57 <br /> Electrical Conductivity(umhos/cm276 297 300 313 269 <br /> Turbidity(NTU)(field) NR NR NR 1.6 0.6 <br /> Temperature(°C)(field) NR NR NR 17.3 21.2 <br /> _Calcium - --28-- -- ------------- -- - ------------------ <br /> Potassium <0.92 <br /> Sodium 9.8 <br /> Magnesium 9.8 <br /> Volatile Organic Compounds ug/I _- <br /> Methylene Chloride <0.23 <br /> Trichloroethene(TCE) <0.36 <br /> 1,1-Dichloroethene <0.24 <br /> Chloroform _ <0.37 <br /> Chlorobenzene <br /> Acetone <0.52 - <br /> Napthalene <0.93 <br /> Methyl ter-butyl ether <0.36 <br /> Toluene <0.32 <br /> 1,4-Dichlorobenzene <0.46 <br /> Tetrachloroethene <0.44 <br /> 2-Butan6ne <0.14 <br /> 1 3-Dichloropropane <0.40 <br /> Chloromethane <0.18 <br /> 1 2 4-Trimethylbenzene <0.18 <br /> 1 3 5-Trimethylbenzene <0.28 <br /> Constituents of Concern Parameters <br /> Semivolatile Organic Compounds <br /> (EPA Method 3520/8270) <br /> All Compounds NR NR NR ND NR <br /> Organochlorine Pesticides and Polychlorinated Biphenyl's <br /> (EPA Method 3510/8080) <br /> All Compounds NR NR NR ND 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 /> LW-1;Printed:7/8/03 23 of 24 <br />