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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> LEACHATE <br /> FOOTHILL SANITARY LANDFILL <br /> Units:mg/l,unless noted <br /> Sample Designation L-1 L-1 L-1 L-1 <br /> Sampling Date 3/7/05 3/28/06 1/31/07 2/5/08 <br /> Constituents of Concern <br /> Total Organic Carbon 725 NT NT NT ---' <br /> Alkalinity,Bicarbonate 1700 1730 1900 890 <br /> Alkalinity,Carbonate <10 <8 NT <2 -- - <br /> Total Alkalinity 1700 1730 1600 730 <br /> Semivolatile Organic Compounds(ugAl <br /> All Other Compounds ND NT NT NT <br /> Organochlorine Pesticides and Polychlorinated Biohenvl's(PCBs) <br /> All Compounds ND NT NT NT -- - <br /> Chlorinated Herbicides NOD <br /> All Compounds NO NT NT NT - -- -- <br /> Metals <br /> Aluminum,Dissolved <0.01 NT NT NT --- -- -"-- --- <br /> Antimony,Dissolved <0.001 NT NT NT <br /> Arsenic,Dissolved 0.008 NT NT NT - - <br /> Barium,Dissolved 0?38 NT NT NT - -Beryllium,Dissolved <0.0002 NT NT NT - -- - <br /> Boron,Dissolved 1.2 NT NT NT - - -Cadmium,Dissolved <0.0002 NT NT NT <br /> Cir — - - <br /> omium,Total Dissolved <0.001 NT NT NT - <br /> - Chromium Hexavalent 0.02 NT NT NT <br /> Cobalt,Dissolved <0.0002 NT NT NT <br /> Copper,Dissolved 0.005 NT NT NT <br /> Iron,Dissolved 16.7 NT NT NT <br /> Lead,Dissolved 0.0011 NT NT NT <br /> Manganese,Dissolved <0.5 NT NT NT --- -- --"- "" <br /> Mercury,Dissolved <0.0001 NT NT NT <br /> Nickel,Dissolved <0.001 NT NT NT <br /> Selenium,Dissolved <0.002 NT NT NT <br /> r ver,Dissolved <0.001 NT NT NT <br /> Thallium,Dissolved <0.0002 NT NT NT <br /> Tin,Dissolved <0.001 NT NT NT _-"--" <br /> Vanadium,Dissolved 0.096 NT NT NT <br /> Zinc,Dissolved <0.01 NT NT NT - <br /> NR=Not Required <br /> NT=Not Tested <br /> NO=Not Detected <br /> °=Trace Concentration <br /> n:\consulting\data\shared\pro' ts\xls\mr\79\791289\FH-Hist.xls <br />