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TABLE 1 <br /> FOOTHILL SANITARY LANDFILL <br /> FOURTH QUARTER 2002 GROUNDWATER MONITORING RESULTS <br /> (Units mg/I unless noted) <br /> Isampling Designation MW-1 MW-2 I MW-3 I Concentration <br /> ampling Date 10/14/02 10/14/02 10/14/02 1 Limit <br /> Monitoring and Field Parameters <br /> Top of Well Casing Elevation 256.25 269.95 318.32 -- <br /> Depth to Groundwater 204.50 223.38 270.27 <br /> roundwater Elevation 51.75 46.57 48.05 <br /> eneral Water Quality Monitorina Parameters <br /> Temperature(°C)(field) 20.4 20.6 20.3 -- <br /> Electrical Conductivity(uS/cm)(field) 250 240 250 340 <br /> H (units)(field) 6.74 6.79 6.72 6.2-9.0 <br /> Turbidity(NTU)(field) 6.9 7.7 6.7 52 <br /> Total Dissolved Solids 360 170 210 265 <br /> Chloride 9.2 8.0 11 9.7 <br /> Sulfate 5.8 2.3 6.2 8.6 <br /> Nitrate-Nitrite as Nitrogen 3.2 3.4 3.2 3.4 <br /> Volatile Or anic Compounds /L <br /> ethyl-tent-butyl-ether 5.3 ND 1.4 detect <br /> 1,4-Dichlorobenzene ND ND 0.8* detect <br /> I Other Compounds ND ND ND detect <br /> Concentration Limit taken from WDRs <br /> R= Not Required <br /> D=Not Detected <br /> W-1 = pgradient(background)well <br /> =Trace concentration (estimated value) <br /> Foothill Sanitary Landfill Department of Public Works/Solid Waste <br /> 4'Quarter and Annual 2002 Groundwater Monitoring Report 8 County of San Joaquin <br />