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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> GROUNDWATER <br /> FOOTHILL SANITARY LANDFILL <br /> Units:mg/t,unless noted <br /> Sample Designation LW-1 LW-1 LW-1 LW-1 LW-1 LW-1 LW-1 LW-1 LW-1 LWA LWA LWA <br /> Sampling Date 11/28/94 5/30/03 8/14/03 1/22104 7/21/04 2/2/05 7/27/05 3/28/06 7/27/06 1/31/07 7/23/07 2/5/08 <br /> Monitorine and Field Parameters <br /> General Water Quality Parameters <br /> ------ ----._--------- <br /> Temperature(°C)(field) 17.3 <br /> 212 19.1 14.7 21.6 16.1 20.4 14.9 19.6 17.6 21 18.1 <br /> Chloride 9.5 10 12 6.6 11 9 It 8.4 11 8.8 9 8.89 <br /> Nitrate-Nitrogen 12 1.3 1.3 3.3 1.1 1.4 1.1 1.1 1 1.2 1 1.13 <br /> Total Dissolved Solids 182 190 180 200 210 180 200 199 228 170 190 170 <br /> Sulfate 15 16 19 5.5 16 15 16 14 16 14 14 14.7 <br /> pH(std.units)(field) 7.68 7.57 6.86 6.94 7.14 7.03 721 6.81 6.8 7.23 727 7.12 <br /> Electrical Conductivity(wnhos/cm)(field) 313 269 171 174 119.7 212 98 143 146 413 245 345 <br /> Turbidity(NTU)(field) 1.6 0.6 2.7 3.74 7.31 4.7 6.6 NR 6.1 18.9 NA 16.4 <br /> Calcium 28 24 23 23 23.9 27.4 29.7 291 24 25 24 <br /> Potassium <0.92 <0.92 3.6 4.0 4.8 10.2 13.2 11.6 10.0 4.7 4.2 <br /> Magnesium 9.8 9.9 l0 9.8 10.0 4.6 5.7 4.6 4.7 10 Il <br /> Sodium 9.8 12 12 12 12.4 12.8 14.6 13.9 13 13 13 <br /> Volatile Oreanic Compounds Lu/1) <br /> Trichloroethene(TCE) <0.36 <0.36 <0.36 <0.36 <0.13 <0.13 <0.13 <0.13 <0.13 <0.13 <0.31 <br /> 1,1-Dichloroethene <024 <0.24 <0.24 <024 <0.39 <0.39 <0.39 <0.39 <0.39 <0.39 <0.43 <br /> Chloroform <0.37 <0.37 <0.37 <0.37 <010 <0.20 <020 <0.20 <0.20 <0.20 <0.33 <br /> Benzene <028 <0.28 <028 <028 <0.17 <0.17 <0.17 <0.17 <0.17 <0.17 <0.30 <br /> m/p-Xylene <0.38 <0.38 <0.38 <0.38 NR NR NR NR NR NR NR <br /> Chlorobenzene <0.32 <0.32 <0.32 <0.32 <0.16 <0.16 <0.16 <0.16 <0.16 <0.16 <0.36 <br /> Methylene Chloride <0.23 (0.28-) <0.23 <0.23 <0.48 <0.48 <0.48 <0.48 <0.48 <0.48 <0.30 <br /> Acetone <0.52 (1.2-) <0.52 <0.52 <1.8 <1.8 <1.8 <1.8 <1.8 <I.8 <2.7 <br /> Napthalene <0.93 <0.93 <0.93 <0.93 <0.24 <0.24 <0.24 <0.24 <0.24 <0.24 <0.29 <br /> Methyl ter-butyl ether <0.36 <0.36 <0.36 <0.36 <0.32 <0.32 <0.32 <0.32 <0.32 <0.32 <0.70 <br /> Toluene <0.32 <0.32 <0.32 <0.32 <0.22 <0.22 <0.22 <0.22 <0.22 <0.22 <0.32 <br /> 1,4-Dichlorobenzene <0.46 <0.46 <0.46 <0.46 <0.14 <0.14 <0.14 <0.14 <0.14 <0.14 <0.34 <br /> Tetrachloroethene <0.44 <0.44 <0.44 <0.44 <0.19 <0.19 <0.19 <0.19 <0.I9 <0.19 <0.40 <br /> 2-Butanone <0.14 <0.14 <0.14 <0.14 <0.92 <0.92 <0.92 <0.92 <0.92 <0.92 <2.0 <br /> 1,3-Dichloropropane <0.40 <0.40 <0.40 <0.40 <0.12 <0.12 <0.12 <0.12 <0.12 <0.12 <0.32 <br /> Chloromethane <0.18 <0.18 <0.18 <0.18 <0.25 <0.25 <0.25 <0.25 <0.25 <0.25 <0.41 <br /> Chloroethane <0.2 <0.2 <02 <0.2 <0.38 <br /> Carbon disulfide <0.11 <0.I I <0.I I <0.11 <0.86 <br /> 1,2,4-Trimethylbenzene <0.18 <0.18 <0.18 <0.18 <0.23 <0.23 <0.23 <0.23 <0.23 <0.23 <0,29 <br /> 1,3,5-Trimethylbenzene <028 <0.28 <0.28 <0.28 <0.20 <0.20 <0.20 <0.20 <0.20 <020 <0.32 <br /> Constituents of Concern Parameters <br /> Semivolatile Oreanic Compounds (EPA Method 3520/8270) <br /> All Compounds ND NR NR NR ND NR NR NR NR NR NR NR <br /> Organochlorine Pesticides and Polychlorinated Biphenyl's <br /> (EPA Method 3510/8080) <br /> All Compounds ND NR NR NR ND NR NR NR NR NR NR NR <br /> "=Trace Concentration <br /> [I J This analytical result appears to be anomalous and therefore was not used in statistical evaluation procedures. <br /> 11,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-Hi st.xls <br />