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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> GROUNDWATER <br /> FOOTHILL SANITARY LANDFILL <br /> Units:mgA,unless noted <br /> Sample Designation MW-1 MW-1 MW-1 MW-1 <br /> Sampling Date 7/27/06 1/31/07 7/23/07 2/5/08 <br /> Monitoring and Field Parameters <br /> General Water Ouality Parameters <br /> Temperature(°C)(field) 21.5 14.8 <br /> 20.8 18.3 ----- -- - <br /> Chloride _ 6 6.1 5.8 5.65 <br /> Nitrate-Nitrogen 2.9 3 2.8 2.88 <br /> Total Dissolved Solids 206 170 -73 150 <br /> Sulfate 55 4.9 4.84 <br /> ------------- - <br /> pH(std.units)(field) 7.14 7.37 7.18 7.26 <br /> Electrical Conductivity(umhos/cm)(field) 358 393 219 391 <br /> Turbidity(NTU)(field) 12.6 13.9 11.64 39.7 <br /> Calcium --22.8 18 19 18 - _--- <br /> ----- - - --- ---- --- ---- --- ----------- <br /> Potassium 11.2 9.6 3.1 2.8 <br /> Magnesium 3.5 3.1 9.9 9.9 <br /> Sodium 12.9 13.0 11.0 10.0 <br /> Volatile Organic Compounds(ug/I) <br /> Trichloroethene(TCE) <0.13 <0.13 <0.13 <0.31 <br /> 1,1-Dichloroethene <0.39 <0.39 <0.39 <0.43 <br /> Chloroform <0.20 <0.20 <0.20 <0.33 <br /> Benzene <0.17 <0.17 <0.17 <0.30 <br /> m/p-Xylene NR NR NR NR <br /> Chlorobenzene <0.16 <0.16 <0.16 <0.36 <br /> Methylene Chloride <0.48 <0.48 <0.48 <0.30 <br /> Acetone <1.9 4.6* 7.5* Q.7 <br /> Napthalene _ <0.24 <0.24 <0.24 <0.29 <br /> Methyl ter-butyl ether <0.32 <0.32 <0.32 <0.70 <br /> -------------- -- <br /> Toluene <0.22 <022 <0.22 <0.32 <br /> 1,4-Dichlorobenzene <0.14 <0.14 <0.14 <0.34 <br /> Tetrachloroethene <0.19 <0.19 <0.19 <0.40 <br /> 2-Butanone <0.92 <0.92 <0.92 <2.0 - - ---.-------- ----- <br /> 1,3-Dichloropropane <0.12 <0.12 <0.12 <0.32 <br /> ---- -.. <br /> Chloromethane.- <0.15<0 25 <0.25 <0.25 <0.41 <br /> Chloroethane <0.2 <02 <02 <0.38 <br /> Carbon disulfide <0.23 <023 <0.23 <0.86 <br /> 1,2,4.-Trimethylbenzene <0.23 <0.23 <0.23 <0.29 <br /> 1,3,5-Trmethylbenzene <0.20 <0.20 <020 <0.32 <br /> Constituents of Concern Parameters <br /> Semivolatile Organic Compounds (EPA Method 3520/8270) <br /> All Compounds NR NR NR NR <br /> Oreanochlorine Pesticides and Polychlorinated Biphenyl's <br /> (EPA Method 3510/8080) <br /> All Compounds 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 /> (I}Parameter also detected in one or more quality control blanks <br /> ND=Not Detected <br /> NM=Not Measured <br /> NR=Not Required <br /> n:\consulting\data\shared\projects\xls\gmr\79\791289\FH-Hist.xis <br />