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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> GROUNDWATER <br /> FOOTHILL SANITARY LANDFILL <br /> -2 <br /> Units:mg/l,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 4/30/98 7/7/98 10/9/98 1/15/99 4/1/99 7/7/99 10/20/99 3/8/00 5/11/00 7/13/00 10/9/00 1/15/01 4/30/01 8/2/01 10/29/01 2/6/02 4/30/02 <br /> Monitoring and Field Parameters <br /> General Water Quality Parameters <br /> Chloride 7.2 7.2 6.7 7.6 9.2 6.4 6.55 7.02 7.04 6.98 7.3 7.12 7.05 6.6 <0.13 8.5 _6.9 <br /> Nitrate-Nitrogen _ 3.3 3.2 3.3 _ 3.5 _ 3.2 3.4 2.62 2.75 2.82 2.8 3.06 2.94 2.92 2.9 2.7 4 3.1 <br /> Total Dissolved Solids - --- 159 188- 180 157 145 172 165 163 169 162 163 171 172 160 160 160_ 180 <br /> Sulfate 2 2 2 2.2 1.8 5.9 3.04_ 3.68 _2.67 3.9 3.48 3.47 3.01 2.9 2.5 2.4 1.3 <br /> pH(std.units)(field) 7.34 7.14 8.27 8..16 7.7 - 7.78„7.94 7.15 8.3 8.47 6.7 7.98 6.54 -7.4 6.19 6.71 ___ -6.80 <br /> Electrical Conductivity(umhos/cm 257.9 209 1.98 199 196 196 196.9 197 188 202 _ 203 198 570 190 380 180 260 <br /> _Turbidity(NTU)�field _ 22.6 _2.1 1.7 LOW 1.46 1.95 ®.46 ---1.2 - - 2 0.67_ 0.58 2.14 -10 6 - 7 2 _9.7 - 2 8- 4.8 <br /> Temperature °C)(field)- _ 20.1 22.4 20.4 19.7 19.4 22.2 20.6 18 19.5 20.5 19.7 15.8 19 8 20 8 19.3 16.8 17.7 <br /> Calcium _.-_-_- <br /> Potassium <br /> Sodium --- -------- <br /> Magnesium <br /> Volatile Organic Compounds(ug/i) <br /> Methylene Chloride 0.0821* 2.45 <0.03 <0.06 <0.06 0.0989* <0.06 <0.06 <0.06 1.6 0.17* <br /> Trichloroethene(TCE) <0.89 <0.89 <0.89 <0.89 <0.89 <0.89 <0.06 <0.06 <0.06 <0.06 <0.06 <0.06 <0.06 <0.06 <0.06 <0.18 <0.06 <br /> 1,1-Dichloroethene <0.72 <0.72 <0.72 <0.72 <0.72 <0.72 <0.04 <0.04 <0.05 <0.06 <0.06 <0.06 <0.06 <0.06 <0.06 <0.12 <0.06 <br /> Chloroform <0.83 <0.83 <0.83 <0.83 <0.83 <0.83 <0.06 <0.07 <0.06 <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <0.18 <0.07 <br /> Chlorobenzene 2.7 <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <0.16 <0.07 <br /> Acetone ND ND ND ND 2.09* <1.79 <1.79 <1.79 <1.8 <1.8 4.5* 2.8* <br /> Npp halene ND ND ND ND 0.11* <0.1 <0.1 <0.1 <0.1 <0.1 <0.46 <0.10 <br /> Methyl ter-butyl ether-- _ _ <0.08 <0.08 <0.08 <0.18 <0.08 <br /> <0.07 <007 <0.07 <0.16 <0.07 <br /> 1,4-Dichlorobenzene <0.11 <0.11 <0.23 <0.11 <br /> Tetrachloroethene <0.08 <0.08 <0.22 <0.08 <br /> 2-Butanone <0.70 <0.65 <0.70 <br /> 1,3-Dichioropropane 0.42 0.09 <br /> Chloromethane _ 0.16" <br /> 1,2,4-Trimethylbenzene <br /> 1,3,5-Trimethylbenzene <br /> Constituents of Concern Parameters <br /> Semivolatile Organic Compounds <br /> (EPA Method 3520/8270) <br /> All Compounds NR NR NR NR NR NR ND NR NR NR NR NR NR NR NR NR NR <br /> Organochlorine Pesticides and Polychlorinated Biphenyl's <br /> (EPA Method 3510/8080) <br /> All Compounds NR NR NR NR NR NR ND 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 13 of 24 <br /> ;rte. <br />