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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> FOOTHILL SANITARY LANDFILL <br /> Page 1 of 4 <br /> Units:mg/l,unless noted <br /> Sample Designation S-1 S-1 S-1 S-1 S-1 S-1 S-1 S-1 S-1 S-1 S-1 S-1 S-1 S-1 S-2 <br /> Sampling Date 01/17/90 02/05/90 03/01/91 03/27/91 11/18/91 12/18/91 03/06/92 01/08/93 01/16/96 01/16/97 01/12/98 02/09/99 01/24/00 01/11/01 02/05/90 <br /> Quarterly Monitoring and Field Parameters <br /> Chloride 198 3.1 31.1 688 9.2 19.4 II 3 2 <1 0.15 <0.010 2.4 2.83 1.4 <br /> Nitrate Nitrogen 5.4 <0.05 NR NR NR NR 0.9 0.5 0.5 <0.1 0.034 0.028 <0.0043 <0.045 0.093 <br /> Total Dissolved Solids 928 103 345 2210 594 138 220 140 88 80 83 120 106 °154... <br /> Total Suspended Solids NR NR NR NR NR NR NR NR 63 21.5 78 24 14 44 NR <br /> Sulfate 135 3.1 39 267 5.5 5.2 9 <5 trace <1 1.3 <0.052 3.18 3.18 1.3 <br /> pH(units) NR NR NR NR NR NR 7.69 NT 7.17 7.7 NT 6.12 6.85 6.91 NR <br /> Electrical Conductivity(umhos/cm) NR 107 NR NR NR NR 227 NT 56 10 46 51.5 54.83 73.6 45.5 <br /> Turbidity(NTU)(field) NR NR NR NR NR NR NR NR 50.0 38.5 NT 194.3 80.2 NT NR <br /> Temperature(°C)(field) NR NR NR NR NR NR NR NR 13.8 10.6 NT 11.4 15.1 16.1 NR <br /> NR=Not Required <br /> NT=Not Tested <br /> N:\XLS\0939\00408\022196yy.XLS, Revision 2:4/4/01 QA/QC <br />