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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> FOOTHILL SANITARY LANDFILL <br /> Units:mg/l,unless noted Page tffdf 4 <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-2 Sam <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 02/05/90 Sam <br /> Ouarterly Monitoring and Field Parameters 0- <br /> Chloride 198 3.1 31.1 688 9.2 19.4 11 3 2 <1 0.15 <0.010 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 0.093 <br /> Total Dissolved Solids 928 103 345 2210 594 138 220 140 88 80 83 120 62 <br /> Total Suspended Solids NR NR NR NR NR NR NR NR 63 21.5 78 24 NR <br /> Sulfate 135 3.1 39 267 5.5 5.2 9 <5 trace <1 1.3 <0.052 1.3 <br /> pH(units) NR NR NR NR NR NR 7.69 NT 7.17 7.7 NT 6.12 NR <br /> Electrical Conductivity(umhos/cm) NR 107 NR NR NR NR 227 NT 56 10 46 51.5 45.5 <br /> Turbidity(NTU)(field) NR NR NR NR NR NR NR NR 50.0 38.5 NT 194.3 NR <br /> Temperature(°C)(field) NR NR NR NR NR NR NR NR 13.8 10.6 NT 11.4 NR <br /> NR=Not Required <br /> NR; <br /> NT=Not Tested NT <br /> HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> ® 939\( 2219fw, Re :6/2 .QA/ ® _ <br />