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HISTORICAL SU*NDWATER OF ANALYTICAL RESULTS <br />FOOTHILL SANITARY LANDFILL <br />MW -2R <br />Units: mg/l, unless noted <br />ample Designation -2 MW -2R MW -2R -2R <br />Sampling Date 8/13/03 1/21/04 7/21/04 2/2/05 <br />Constituents of Concern Parameters <br />Chlorinated Herbicides <br />(EPA Method 8150A Modified <br />II Compounds NR NR ND NR <br />Metals(mQ/I) <br />Aluminum, Dissolved NR NR 0.043* NR <br />Chromium, Total Dissolved NR NR 0.0044 NR <br />Chromium Hexavalent NR NR NR NR <br />Cobalt, Dissolved <br />NR <br />NR <0.0025 <br />NR <br />Copper, Dissolved <br />NR <br />NR 0.0019* <br />NR <br />Iron, Dissolved <br />NR <br />NR <0.0038 <br />NR <br />Lead, Dissolved <br />NR <br />NR <0.000023 <br />NR <br />Manganese, Dissolved <br />NR <br />NR 0.00060* <br />NR <br />Mercury, Dissolved <br />NR <br />NR <0.000032 <br />NR <br />Nickel, Dissolved <br />NR <br />NR 0.00042 <br />NR <br />Selenium, Dissolved <br />NR <br />NR <0.00030 <br />NR <br />Silver, Dissolved <br />NR <br />NR <0.01 <br />NR <br />Thallium, Dissolved <br />NR <br />NR <0.000016 <br />NR <br />Tin, Dissolved <br />NR <br />NR <0.033 <br />NR <br />Vanadium, Dissolved <br />NR <br />NR 0.019* <br />NR <br />Zinc. Dissolved <br />NR <br />NR <0.0005 <br />NR <br />Total Organic Carbon NR NR 2.7 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 -2R; Printed: 08/11/2005 10 of 32 <br />