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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />GROUNDWATER <br />FOOTHILL SANITARY LANDFILL <br />MW -11 <br />Units: mgn unless noted <br />Sample Designation MW -1 MW -1 MW -1 MW -1 MW -1 MW -1 MW -1 MW -1 MW -1 MW -1 MW -1 MW -1 MW -1 MW -1 MW -1 MW -1 MW -1 <br />Sampling Date 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 8/1/02_ <br />Monitorina and Field Parameters <br />General Water Quality Parameters <br />Chloride 6.5 6.4 0.23 8.2 6.7 6.09 6.79 6.74 6.03 4.29 6.55 6.23 5.8 7 7.3 6.4 6.4 <br />2.8 <br />Total Dissolved Solids <br />202 <br />176 <br />162 <br />165 <br />182 <br />187 <br />180 <br />194 <br />186 <br />184 <br />183 <br />219 <br />180 <br />160 <br />170 <br />190 <br />170 <br />Sulfate <br />6.4 <br />6.5 <br />6.5 <br />5.9 <br />6.3 <br />7.43 <br />7.6 <br />7.55 <br />6.48 <br /><0.021 <br />7.02 <br />6.73 <br />6.7 <br />7 <br />7.6 <br />5.2 <br />5.9 <br />pH (std. units) (field) <br />8.22 <br />6.93 <br />8.37 <br />7.08 <br />7.77 <br />8.06 <br />7.37 <br />7.52 <br />8.5 <br />6.61 <br />7.41 <br />6.92 <br />8.09 <br />6.29 <br />6.91 <br />6.79 <br />7.02 <br />Electrical Conductivity (umhos/cm <br />237 <br />251 <br />243 <br />235 <br />236 <br />237 <br />237 <br />242 <br />240 <br />240 <br />264 <br />710 <br />220 <br />400 <br />100 <br />280 <br />270 <br />Turbidity (NTU) (field) <br />4 <br />2.9 <br />LOW <br />3.25 <br />1.43 <br />1.23 <br />1 <br />4.02 <br />0.49 <br />0.27 <br />2.51 <br />12.4 <br />10 <br />11.7 <br />6.7 <br />7.1 <br />3.4 <br />Temperature (°C) (field) <br />22.7 <br />20.8 <br />18 <br />20.8 <br />20.1 <br />21.3 <br />18.2 <br />23.3 <br />20.5 <br />19.8 <br />17.8 <br />20.0 <br />20.4 <br />19.2 <br />16.6 <br />18.6 <br />20.7 <br /><0.72 <0.72 <0.72 <0.04 <br /><0.83 <0.83 <0.83 <0.06 <br /><0.1 <br /><1.79 <1. <br /><0. <br />1,3-Dichloropropane <br /><0.20 <0.09 <0.09 <br />Chloromethane <0.14 <0.14 <br />Constituents of Concern Parameters <br />Chlorinated Herbicides <br />(EPA Method 8150A Modified <br />All Compounds NR NR NR NR NR ND 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 />NO = Not Detected <br />NR = Not Required <br />MW -1: Printed: 3/4/03 5 of 24 <br />