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HISTORICAL SUMMARY OF ANALYTICAL RESULTS GROUNDWATER FOOTHILL SANITARY LANDFILL Units: mg/l, unless noted Sample Designation MW -5 MW -5 MW -5 MW -5 MW -5 MW -5 MW -5 Sampling Date 7/23/07 4/1/08 7/30/08 1/I5/09 8/17/09 10/7/09 2/3/10 Monitoring and Field Parameters General Water Quality Parameters 7.76 7.58 6.91 7.87 7.55 6.98 7.83 - _ Temperature (°C) (field) ..---------------- Chloride 24.9 8.8 19.9 - 8.72 21.7 8.54 18.5 ..----- 9.01 22.1 {7.6} 20 NA 20.9 7.1 Nitrate -Nitrogen _- _- _ 1.6 1.71 _ 1.69 1.8 1.8 NA 1.8 Total Dissolved Solids 184 160 200 -- _ 220 210 NA 210 0 Sulfate - 9.9 9.93 9.99 - 10.93 8.8 NA 9 pn tsm. unns/ tnemi 7.76 7.58 6.91 7.87 7.55 6.98 7.83 Electrical Conductivity(mnhos/an) (field) 258 258.8 250.8 --- 259.6 260.8 261.7 -- 254.7 Turbidity (NTU) (field) -.-__-_------__-_,-_-- 29.7 12.9 10.3 11.7 8.9 13.3 7.4 Calcium 21.1 - 22 20 21 22 NA 21 - Potassium_ _ - 3.68 3.6 3.6 3.7 3.7 NA 3.6 Magnesium - --- -- 10.6 1 I11 _ _ 11 l--- NA 11 Sodium 14.8 14 14 13 l5 NA 15 Benzene------- <0.17 <0.30 <0.33 <033 <0.18 NA <0.086 Bromochloromethane - NA NA <0.37 <0.32 <0.35 NA <0.23 - romodichloromethane - NA NA <0.30 <0?8 <0.30 NA <0.12 Bromofomt NA NA <0.31 <0.31 ----- <034 NA ---- <0.23 Bromomethane _ NA NA <0.40 <0.33 <0.21 NA <0.20 �" -- ---.-- Carbon Tetrachloride NA NA <0.46 <0.46 <0.19 NA <0.18 -_-- -- -- -- Chlorobenzene<0.39 <0.39 NA NA <0.081 --- - ""- -- Chloroethane <0? <0.38 <0.38 <0.31 <0.25 NA <O.II " oro orm <0?0 <0.33 <0.33 <0.33 <0?3 NA <0.073 Chloromethane <0.25 <0.41 <0.41 <0.36 <0.20 NA <0.1 I t romochloromethane NA NA <0.32 <0.31 <0.23 NA <0.077 ,2-Dibromo-3-chloropropane NA NA <0.69 <0.69 <0.46 NA <0.44 _ - - --_-"- 1,2-Dibromoethane (EDB) NA NA <0.39 <0.39 <0.29 NA <0.16 -__ t rotnomethane NA - ------ NA <0.38 <0.38 <0.37 NA <0.19 1,2 -Dichlorobenzene NA NA --- < 0 <0.38 - <0.38 -...-.._ <0.15 N - A <0.068 1,3 -Dichlorobenzene - ------- NA ---- NA <0.37 <0.37 <0.15 NA <-0-- --- _-- _--- ------ 1,4 -Dichlorobenzene <0.14 <0.34 ---- <0.38 <0.38 <0.16 NA <0.083 Dichlorodifluoromethane NA NA <0.68 <0.56 <0.21 NA <0.11 ---- ---- 1,1-Dichloroethane NA NA <0.37 <0.34 <0.13 NA <0.081 - _-- --_-- - __--- 1,2-Dichloroethane(EDC) NA NA <0.38 <0.38 <0.24 NA <-0.14 -- -- -- tchloroethene <0.39 <0.43 <0.43 <0.29 <0.16 NA <0.12 -_- __-- --- - --- - cis 1,2-Dichloroethene NA NA <0.36 <0.34 <0.32 NA <0.11 ---- _- - ---- ----- - _ trans-1,2-Dichloroethene NA NA <0.41 <0.33 <0.14 NA <0.097 - - - - -- - - --- - 1,2-Dichloropropane NA NA <0.35 <0.35 <0.16 NA <0.12 --- --- -_-- cis-1,3-Dichloropropene NA NA <0.30 <0.29 <0.19 NA <0.098 - ---"- - trans-l,3-Dichloropropene NA NA <0.35 <0.35 <0.13 NA <0.079 -- -- ---- - - -_, thylbenzene NA NA <0.43 <0.43 <0_14 NA <0.12 _--- - - exachlorobutadiene NA NA <0.65 <0.65 <0.26 NA"-