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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> GROUNDWATER <br /> FOOTHILL SANITARY LANDFILL <br /> LW-1 <br /> Units:mg/l,unless noted -- <br /> Sample Designation LW-1 LW-1 LW-1 LWA LW-1 <br /> Sampling Date 10/4/93 1/5/94 7/5/9411/28/94 5/30/03 <br /> Constituents of Concern Parameters <br /> Chlorinated Herbicides <br /> (EPA Method 8150A Modified) <br /> All Compounds NR NR NR ND NR <br /> Metals <br /> Aluminum,Dissolved NR NR <0.05 trace NR <br /> Antimony,Dissolved NR NR <0.05 <0.02 NR <br /> Arsenic,Dissolved NR NR <0.005 trace NR <br /> Barium,Dissolved NR NR NR 0.11 NR <br /> Beryllium Dissolved NR NR NR <0.0005 NR <br /> Boron,Dissolved NR NR NR NR NR <br /> Cadmium,Dissolved NR NR <0.005 <0.002 NR <br /> Chromium,Total Dissolved NR NR <0.01 trace NR <br /> Chromium Hexavalent NR NR NR 0.027 NR <br /> Cobalt,Dissolved NR NR NR <0.003 NR <br /> Copper,Dissolved NR NR <0.01 trace NR <br /> Iron,Dissolved <0.02 <0.02 <0.05 0.027 NR <br /> Lead,Dissolved NR NR <0.002 <0.001 NR <br /> Manganese Dissolved NR NR <0.01 0.007 NR <br /> MercuryDissolved NR NR <0.0005 <0.0001 NR <br /> Nickel,Dissolved NR NR <0.04 <0.007 NR <br /> Selenium,Dissolved NR NR <0.005 <0.001 NR <br /> Silver,Dissolved NR NR <0.01 trace NR <br /> Thallium,Dissolved NR NR <0.005 <0.001 NR <br /> Tin,Dissolved NR NR NR <0.01 NR <br /> Vanadium,Dissolved NR NR NR 0.011 NR <br /> Zinc,Dissolved NR NR <0.01 0.012 NR <br /> Total Alkalini 100 100 100 104---100 <br /> Alkalinity,Bicarbonate 100 100 100 104 100 _ <br /> Alkalinity Carbonate <5 <5 <5 <2 <5.0 _ <br /> Cyanide NR NR NR <0.003 NR <br /> Sulfide <0.1 <0.1 <0.1 <2 NR _ __...__ - .___-__ <br /> Total Organic Carbon <0.5 <0.5 <0.5 <0.2 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 /> NO=Not Detected <br /> NM=Not Measured <br /> NR=Not Required - <br /> LW-1;Printed:7/8/03 24 of 24 <br />