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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />FOOTHILL SANITARY LANDFILL <br />Units: mg/I, unless noted <br />Sample Designation <br />MW -1 <br />MW -1 <br />MW -I <br />MW -1 <br />MW -1 <br />MW -I <br />MW -I <br />MW -1 <br />MW -1 <br />MW -1 <br />MW -1 <br />MW -1 <br />MW -1 Page 3 of 22 <br />Sampling Date <br />7/9/1996 <br />10/2/1996 <br />1/16/1997 <br />4/10/1997 <br />7/10/1997 <br />10/3/1997 <br />3/11/1998 <br />4/30/1998 <br />7/7/1998 <br />10/9/1998 <br />1/15/1999 <br />4/1/1999 <br />7/7/1999 <br />Quarterly Monitoring and Field Parameters <br />Volatile Organic Compounds (ugA) <br />(EPA Method 8260) <br />Trichloroethene (TCE) <br /><0.89 <br /><0.89 <br /><0.89 <br /><0.89 <br /><0.89 <br /><0.89 <br /><0.89 <br /><0.89 <br />1,1-Dichloroethene <br /><0.72 <br /><0.72 <br /><032 <br /><0.72 <br /><0.72 <br /><0.72 <br /><032 <br /><0.72 <br />Chloroform <br /><0.83 <br /><0.83 <br /><0.83 <br /><0.83 <br /><0.83 <br /><0.83 <br /><0.83 <br /><0.83 <br />Chlorobenzene <br />2.6 <br />Chloride <br />6 <br />6 <br />4.7 <br />4.7 <br />4.7 <br />6.1 <br />8 <br />6.8 <br />6.5 <br />6.4 <br />0.23 <br />8.2 <br />6.7 <br />Nitrate -Nitrogen <br />2.3 <br />2.9 <br />2.1 <br />2.4 <br />2.3 <br />2.4 <br />3.4 <br />2.8 <br />12 <br />2.8 <br />2.3 <br />2.6 <br />2 <br />Total Dissolved Solids <br />250 <br />210 <br />225 <br />187 <br />194 <br />216 <br />196 <br />186 <br />202 <br />176 <br />162 <br />165 <br />182 <br />Sulfate <br />6 <br />7 <br />4.9 <br />5.1 <br />4.8 <br />6 <br />6.5 <br />6.6 <br />6.4 <br />6.5 <br />6.5 <br />5.9 <br />6.3 <br />pH (std. units) (field) <br />7.65 <br />7.25 <br />9.28 <br />7.65 <br />7.83 <br />7.93 <br />7.97 <br />8.03 <br />8.22 <br />6.93 <br />8.37 <br />7.08 <br />7.77 <br />Electrical Conductivity (umhos/cm) (field) <br />257 <br />245 <br />610 <br />153 <br />173 <br />278 <br />224 <br />245 <br />237 <br />251 <br />243 <br />235 <br />236 <br />Turbidity (NTU) (field) <br />51.9 <br />16.9 <br />2.27 <br />3.47 <br />2.69 <br />56.5 <br />1 <br />29.6 <br />4 <br />2.9 <br />LOW <br />3.25 <br />1.43 <br />Temperature (°C) (field) <br />22.3 <br />21.8 <br />15.2 <br />24.4 <br />21.5 <br />22 <br />19.5 <br />20.6 <br />22.7 <br />20.8 <br />18 <br />20.8 <br />20.1 <br />Constituents of Concern Parameters <br />Semivolatile Organic Compounds <br />(EPA Method 3520/8270) <br />All Compounds <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />Organochlorine Pesticides and Polychlorinated Biphenyl's <br />(EPA Method 3510/8080) <br />All Compounds <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />Chlorinated Herbicides <br />(EPA Method 8150A Modified) <br />All Compounds <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />" = Trace Concentration <br />[ 1) This analytical result appears to be anomalous and therefore was not used in statistical evaluation procedures. <br />ND = Not Detected <br />NR = Not Required <br />N:\XLS\0939\004080-list, Revision 1:3/31/2000 QA/QC <br />