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HISTORICAL SUMMARY SULTS <br /> SURFACE WATER <br /> NORTH COUNTY SANITARY LANDFILL <br /> Units:mg/l,unless noted <br /> Sample Designation S4 S-4 <br /> Sampling Date 1/10/05 1/3/06 <br /> Monitorine and Field Parameters <br /> Genera-1 Water Quality Parameters <br /> Temperature(°C) 14.1 12.1 <br /> Chloride 94 31 <br /> Nitrate Nitrogen <0.23 0.6 <br /> Total Dissolved Solids 540 290 <br /> Sulfate 34 25 <br /> pH(std.units) 6.43 6.64 <br /> Electrical Conductivity(umhos/cm) 291 247 <br /> Turbidity KM 48.1 >200 <br /> Total Suspended Solids 8.0 39.0 <br /> Alkalinity as CaCO3,Total 160 86 <br /> Alkalinity,Bicarbonate 160 86 <br /> Alkalinity,Carbonate <5.0 <2.2 <br /> Cyanide <0.025 NR <br /> Sulfide <0.10 NR <br /> Total Organic Carbon 190 NR <br /> Hardness,Total NR NR <br /> Chemical Oxygen Demand 230 NR <br /> Dissolved Oxygen 7.4 0.68 <br /> Metals <br /> Calcium,Total 29 NR <br /> Magnesium,Total 16 NR <br /> Potassium,Total 90 NR <br /> Sodium,Total 26 NR <br /> Constituents 91 Concern Parameters <br /> Oil and Grease <5.0 NR <br /> Metals <br /> Aluminum,Total <0.20 NR <br /> Antimony,Total <0.20 NR <br /> Arsenic,Total <0.20 NR <br /> Barium,Total <0.20 NR <br /> Beryllium,Total <0.020 NR <br /> Boron,Total NR NR <br /> Cadmium,Total <0.020 NR <br /> Chromium,Total Dissolved <0.020 NR <br /> Chromium Hexavalent NR NR <br /> Cobalt,Total <0.080 NR <br /> Copper,Total <0.020 NR <br /> Iron,Total 1.7 NR <br /> Lead,Total <0.20 NR <br /> Manganese,Total 0.31 NR <br /> Mercury,Total <0.0002 NR <br /> Molybdenum,Total NR NR <br /> Nickel,Total 0.23 NR <br /> Selenium,Total <0.20 NR <br /> Silver,Total 0.088 NR <br /> Strontium,Total NR NR <br /> Thallium,Total 0.36 NR <br /> Tin,Total <0.10 NR <br /> Vanadium,Total <0.080 NR <br /> Zinc,Total <0.080 NR <br /> [1]PH meter was not functioning correctly <br /> (2) These data appear to be anomalous and are not used in the statistical evaluation. <br /> NR=Not Required,NT=Not Tested-dry <br /> n:\con ting\data\shared\projects\xls\gmr\79\791288\NC hist gw and surface 07-28-06 <br />