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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> GROUNDWATER <br /> FOOTHILL SANITARY LANDFILL <br /> LW-1 <br /> Units:m n,unless noted <br /> Sample Designation - L - -1 -1 <br /> Sampling Date 10/4/93 1/5/94 7/5/94 11/28/94 5/30/03 8/14/03 <br /> Monitoring and Field Parameters <br /> General Water Quality Parameters <br /> Temperature(°C)(field) NR NR NR 17.3 21.2 19.1 <br /> Chloride 8 10 14 9.5 10 12 <br /> Nitrate-Nitro en 1.1 1.1 1.1 1.2 1.3 1.3 <br /> otal Dissolved Solids 220 230 240 182 190 180 <br /> Sul ate 14 <8 16 15 16 19 <br /> pH(std.units)(field) 6.40 7.42 7.82 7.68 7.57 6.86 <br /> Electrical Conductivity(umhos/cm) 276 297 300 313 269 171 <br /> Turb diT-ty(NTU)(field) NR NR NR 1.6 0.6 2.7 _ <br /> Calcium 28 24 <br /> Potassium <0.92 <0.92 <br /> Magnesium 9.8 9.9 <br /> Sodium 9.8 12 <br /> Volatile Organic Compounds <br /> Trichloroethene(TCE) <0.36 <0.36 <br /> 1,1-Dichloroethene <0.24 <0.24 <br /> Chloro orm <0.37 <0.37 <br /> Benzene <0.28 <0.28 <br /> mom-Xylene <0.38 <0.38 <br /> Chiorobenzene <0.32<0 23 <0.32 <br /> 0.28* <br /> _Methylene Chloride _ _ ( <br /> Acetone _ _ -<0-.52 <br /> -_(1.2 <br /> �.-- -- - <br /> <0.93_ <0.93 <br /> Napihalene <br /> ----- -- <br /> _ ------ <0.36 <0.36 <br /> eti� ter=bu etFier <br /> ----- - -- ---- --- <0.32 <br /> _ Toluene _- <br /> -- -- <br /> ck oro enzene___ <br /> ---'i'etrachToroefhene <br /> -- - -------- <0.44 <0.44-_-- ---- <br /> --- ---- ------- -- - <br /> -_2Butanone <br /> ----- -.-_-- -------- <0.14 <0.14 <br /> _------- <0.40 <0.40 <br /> 1;_-3-Dichioro�ropane <br /> Chloromethane <br /> --- <0.18 <0.18 <br /> '�24=1"rlmethytbenzene <br /> _ _ _-_- __- <0.28 <0.28 <br /> 1 3 5-'i'�Imethylbenzerie- ___ <br /> Constituents of Concern Parameters <br /> Semivolatile Organic Compounds <br /> (EPA Method 3520/8270) <br /> All Compounds NR NR NR ND NR NR <br /> Organochlorine Pesticides and Polychlorinated Biphenvl's <br /> (EPA Method 3510/8080) <br /> All Compounds NR NR NR ND NR NR - <br /> race oncentration <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:1/30/2004 27 of 28 <br />