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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> GROUNDWATER <br /> FOOTHILL SANITARY LANDFILL <br /> MW-3 <br /> Units:mg/l,unless noted <br /> Sample Designation MW-3 MW-3 MW-3 MW-3 <br /> Sampling Date 8/14/03 1/21/04 7/22/04 2/2/05 <br /> Constituents of Concern Parameters <br /> Chlorinated Herbicides <br /> (EPA Method 8150A Modified) <br /> All Compounds NR NR ND NR <br /> Metals <br /> Aluminum,Dissolved NR NR 0.036* NR <br /> Antimony Dissolved NR NR <0.000014 NR _ <br /> _Arsenic,Dissolved NR NR 0.0013 NR <br /> Barium,Dissolved NR NR 0.076* NR <br /> Beryllium Dissolved NR NR 0.0019* NR <br /> Boron,Dissolved NR NR NR NR <br /> Cadmium,Dissolved NR NR <0.000018 NR <br /> Chromium,Total Dissolved NR NR 0.0038* NR <br /> Chromium Hexavalent NR NR NR NR <br /> Cobalt,Dissolved NR NR <0.0025 NR <br /> Copper Dissolved NR NR 0.0013* NR <br /> Iron,Dissolved NR NR <0.0038 NR <br /> Lead,Dissolved NR NR 0.00012* NR <br /> Manganese,Dissolved NR NR <0.0003 NR <br /> MercuryDissolved NR NR <0.000032 NR _ <br /> Nickel,Dissolved NR NR 0.00057* NR <br /> Selenium,Dissolved NR NR 0.00041* NR <br /> Silver,Dissolved NR NR <0.01 NR <br /> Thallium,Dissolved NR NR <0.000016 NR <br /> Tin,Dissolved NR NR <0.033 NR <br /> Vanadium,Dissolved NR NR 0.019* NR <br /> Zinc,Dissolved NR NR <0.0005 NR <br /> Total Alkalinity 110 110 100 110 <br /> _Alkalinity,Bicarbonate 110 110 100 110 <br /> Alkalinity Carbonate <5.0 <5.0 <5.0 <2.2 <br /> Cyanide NR NR <0.017 NR <br /> Sulfide NR NR 0.026* NR <br /> Total Organic Carbon NR NR <0.56 NR <br /> '=Trace Concentration <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 /> MW-3;Printed:7/15/2005 16 of 28 <br />