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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> GROUNDWATER <br /> FOOTHILL SANITARY LANDFILL <br /> W-3 <br /> Units:m n,unless noted <br /> pie Designation MWZ - 91W-3 MW-3 MW-3 -3 <br /> Sampling Date 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 8/1/02 10/14/02 1/29/03 5/30/03 <br /> Monitoring and Field Parameters <br /> Gen Lal Water Qualily Parameters <br /> _Temperature(°C)(field) 19.3 24.6 21.5 17.3 20.5 21.7 20 23.7 19.3 20.8 19.1 16.9 18.8 26.6 20.3 16.1 21.3 <br /> Chloride 13 7.1 9.61 9.7 9.73 9.6 9.96 12 9.76 9 11 12 9.3 10 11 11 NM <br /> urate• itrogen 4.1 2.9 3.5 3.21 3.45 3.36 3.5 3.64 3.48 3 3.5 4 3.5 3.8 3.2 3.8 NM <br /> Total Dissolved Solids 179 213 220 202 204 188 196 191 199 200 220 190 200 190 210 190 NM <br /> Sulfate 5.1 1.9 6.57 7.24 6.98 7.62 7.19 7.66 7.00 6.9 8.8 10 6.4 6.7 6.2 7 NM <br /> p (std.units)(field) 7.77 7.41 7.9 7.36 7.8 8.23 7.41 7.01 6.6 7.11 6.36 6.8 9.94 7.06 6.72 6.69 7.58 <br /> Electrical Conductivity(umhos/cm) 268 271 270 264 273 272 272 316 600 190 610 210 290 300 250 377 273 <br /> i u idity( T )(field) 1.3 1. 1 >200 3.3 0.33 0.55 0.21 2.35 12.1 7. 17.1 6.3 3.7 3.7 6.7 3.1 0.6 <br /> Calcwm <br /> NM 2 <br /> Potassium <br /> N 2 9 <br /> Magnesium M <br /> NM 11 <br /> odium <br /> N 15 <br /> Volatile Organic Compounds(ug/1 <br /> Tri <0.89 <0.89 <0.06 0.227* 0.652 0.285* 0.323* 0.717 0.435* 0.065* 0.097* <0.18 <0.06 <0.06 <0.2 <0.36 NM <br /> 1,1-Dichloroethene <0.72 <0.72 <0.04 <0.04 0.285* 0.0795* 0.0688 0.316* 0.217* <0.06 <0.06 <0.12 <0.06 <0.06 <0.2 <0.24 NM <br /> Chloroform <0.83 <0.83 <0.06 <0.07 <0.06 <0.07 <0707 <0.07 <0.07 <0.07 <0.07 <0.18 <0.07 <0.07 <0.3 <0.37 NM <br /> enzene <1.0 <1.0 <0.04 <0.05 <0.04 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.14 <0.05 <0.05 <0.20 <0.28 NM <br /> m/ -Xylene <0.78 <0.78 <0.21 <0.21 <0.21 <0.21 <0.21 <0.21 <0.21 <0.21 <0.21 <0.24 <0.21 <0.21 <0.20 <0.38 NM <br /> Chlorobenzene <0.90 <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <0.1 <0.07 <0.07 <0.2 <0.32 NM <br /> Methylene Chlorla <0.03 2.43 <0.03 <0.06 <0.06 <0.06 <0.06 <0.06 <0.06 {1.9} <0.06 <0.06 <0.3 <0.23 NM <br /> Acetone 2.03* <1.79 <1.79 <1.79 <1.79 <11.8 <1 8 4 4} <11.8 <1.8 <2.0 <0 52 N <br /> Na tha ene <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.46 <0.1 <0.10 <0.3 <0.93 NM <br /> Methyl ter-butyl ether <0.08 <0.08 <0.08 <0.18 <0.08 <0.08 1.4 <0.36 NM <br /> Toluene <0.07 <0.07 <0.07 <0.16 <0.07 <0.07 <0.2 <0.32 M <br /> 1,4-Dichlorobenzene 0. 8 <0.11 <0.23 <0.11 <0.11 0.8 <0.46 NM <br /> Tetrach oroe ene 0.086* <0.08 <0.22 <0.0 <0.08 <0.3 <0.44 NM <br /> - utanone <0.70 <0.65 <0.70 <0.70 <2.0 <0.14 NM <br /> 1,3- chloro ro ane <0.20 <0.09 <0.09 <0.2 <0.40 N <br /> loromethane <0.14 <0.3 <0. 8 NM <br /> 1, 4- rimethbenzene N <br /> Tnmem3enzene NM <br /> Constituents of Concern Parameters <br /> Semivolatile Organic Compounds <br /> (EPA Method 3520/8270) <br /> All Compounds NR NR ND NR NR NR NR NR NR NR NR NR NR NR NR NR NR <br /> Organochlorine Pesticides and Polychlorinated Biphenyl's <br /> (EPA Method 351.0/8080) <br /> All Compounds NR NR ND NR 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-3;Printed:1/30/2004 21 of 28 <br />