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TABLE 1 <br /> FOOTHILL SANITARY LANDFILL <br /> THIRD QUARTER 1999 GROUNDWATER MONITORING RESULTS <br /> (Units mg/l unless noted) <br /> Sampling Designation MW-1* MW-2 MW-3 Groundwater <br /> Sampling Date 7/7/99 7/7/99 7/7/99 ConEent{ation <br /> Iml s <br /> Quarterly Monitoring and Field Parameters <br /> Top of Well Casing Elevation 256.25 269.95 318.32 -- <br /> ' Depth to Groundwater 203.23 222.25 268.97 =_ <br /> Groundwater Elevation 53.02 47.70 49.35 <br /> Temperature (°C) (field) 20.1 22.2 24.6 NE <br /> Electrical Conductivity(uS/cm)(field) 236 196 271 NE(1) <br /> pH (units) (field) 7.77 7.78 7.41 6.54-8.99 <br /> Turbidity(NTU) (field) 1.43 1.95 1.01 76.2 <br /> otal Dissolved Solids 182 172 213 258.7 <br /> Chloride 6.7 6.4 7.1 NE(1) <br /> Sulfate 6.3 5.9 1.9 N E(1) <br /> Nitrate-Nitrite as Nitrogen 2 3.4 2.9 NE(1) <br /> Volatile Organic Compounds(ug/L) detect <br /> 1,1-dichloroethene ND <br /> Benzene ND <br /> Trichloroethene ND <br /> Toluene ND <br /> Chlorobenzene 2.6 2.7 ND <br /> m/p-Xylene ND <br /> R=Not Required <br /> E=Not Established <br /> 1)False positive rate greater than 5% <br /> ' D=Not Detected <br /> =Upgradient(background)well <br /> t <br /> 8 <br />