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an = MM M mmm <br /> HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> GROUNDWATER <br /> FOOTHILL SANITARY LANDFILL <br /> Units:tng/I,unless noted <br /> Sample Designation MW-4 MW-4 <br /> Sampling Date 7/23/07 2/5/08 <br /> Monitoring and Field Parameters <br /> General Water Quality Parameters <br /> Temperature(°C)(field) 23.5 11.6 <br /> Chloride _--- 6.8 7.1 - - ---- <br /> Nitrate-Nitrogen - -- 1.6 1.7 - <br /> Total Dissolved Solids 193 170 - -- - <br /> Sulfate 9.2 9.88 <br /> pH(std.units)(field) 7.61 -.._-8 24 <br /> Electrical Conductivity(umhos/cn)(field) 266 371 <br /> Turbidity(NTU)(field) 48.1 46.3 -- --- <br /> Calcium 21.6 22 <br /> Potassium 4.23 _ 3.9 <br /> Magnesium 10.9 II -- -- --- - <br /> Sodium IS 13 <br /> Volatile Organic Compounds(ug/1) <br /> Trichloroethene(TCE) <0.13 <0.31 _ -_-- <br /> I,1-Dichiotoethene -. - <0.39 <0.43 <br /> Chloroform <020 <0.33 ---- ------ - ----- __.. -_... <br /> Benzene <0.17 <0.30 <br /> ------_.._ _... --__-_ _.__.. ---- ------ ------- -__.. --- - <br /> . ---- ------------------- ----_ .__- -------- - <br /> tn/p-Xylene NR NR <br /> Chlorobenzene <0.16 <0.36 - <br /> Methylene Chloride <0.48 <0.30 <br /> Acetone <l-g c2.7 <br /> Napthalene _... __-- <024 <0.29 <br /> Methyl ter-butyl ether <0.32 <0.70 <br /> Toluene <0.22 <0.32 - <br /> 1,4-Dichlorobenzene <0.14 <0.34 <br /> Tetrachloroethene <0.19 <0.40 - <br /> 2-Butanone -_. ..- _- <0.92 <2.0 _ <br /> 123-Dich1loro ro ane < <br /> P P 0.12 <0.32 <br /> Chloromethane _.. -<0.25 <0.41 <br /> Chloroethane - - <0.2 <0.38 -- --- _- - <br /> Carbon disulfide <0.1 I <0.86 --- - - - _- <br /> 1,2,4-Ti <0.23 <br /> _. <0.29 <br /> ------- _--------- ------------ __. ___. _-... -. <br /> 1,3,5-Trimethylbenzene - - _ - <0.20 <0.32 _- ---- - -- - -- <br /> Constituents of Concern Parameters <br /> Semivolatile Organic Compounds (EPA Method 3520/8270) <br /> Di-n-butyl Phthalate (0.0023-) <br /> All Compounds ND NR --_ - - <br /> Organochlorine Pesticides and Polychlorinated Biphenyl's <br />