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G-2 HISTORICAL SUMMARY OF ANALYTICAL RESULTS,NORTH COUNTY SANITARY LANDFILL Sampling Date 12/1/94 1/3/95 4/3/95 7/7/95 10/2/95 1/2/96 4/5/96 7/10/96 Concentration Limits MCL General Water Quality Parameters mg/-1 Temperature(°C) 19.0 18.2 21.0 22.5 21.3 18.8 21.5 20.7 NE NE Chloride 7.4 8.1 6 6 8 7 7 7 41 250** Nitrate Nitrogen 1.5 1.3 1.4 1.5 1.3 - 1.2 1.3 1.3 4 10 Total Dissolved Solids 189 180 200 220 2.80 210 230 220 300 500** Sulfate 3.5 3.5 trace 3 5 4 trace 4 31 250** pH(std.units) 7.22 7.82 7.08 8.18 7.13 7.38 6.97 7.01 6.0-8.1 6.5-8.5 Electrical Conductivity(umhos/cm) 236 210 202 237 241 223 210 224 450 900 _Turbidity(NTU)field 1.7 1.0 0.20 NT 5 7.2 3 2.9 18 Total Organic Carbon 1.5 NT NT NT NT NT NT NT NE NE Alkalinity,Bicarbonate 88 NT NT NT NT NT NT NT 130 NE Alkalinity,Carbonate <2 NT NT NT NT NT NT NT NE NE Total Alkalinity 88 NT NT NT NT NT NT NT NE NE Cyanide _ <0.003 NT NT NT NT NT NT NT NE 0.15 Sulfide _ <2 NT NT NT NT NT NT NT NE NE underline=exceeds concentration limit Volatile Organic Compounds(ug/I) Bromoform ND ND ND ND ND <0.2 <0.2 <0.2 detect 1 ___Isopropylbenzene ND ND ND ND ND <0.3 <0.3 <0.3 detect _NE Naphthalene <1.6 <1.6 <1.6 <0.06 <0.060 <0.3 <0.3 <0.3 detect NE 1,1,2,2-tetrachloroethane ND ND ND ND ND <0.2 <0.2 <0.2 detect 1 1,1,2-trichloroethane ND ND ND ND ND <0.5 <0.5 <0.5 detect 5 Trichloroethene(TCE) ND ND ND ND ND <0.4 <0.4 <0.4 detect 5 ____Trichlorofluoromethane(Freon 11) ND ND ND ND ND <0.4 <0.4 <0.4 detect 150 Semivolatile Organic Compounds(ug/1) Bis(2-ethylhexyl)Phthalate_ 23 NT NT NT NT NT NT NT detect NE Metals mg/1 _Aluminum,Dissolved_ 0.256 NT NT NT NT NT NT NT I 1/0.2** Antimony,Dissolved _ <0.017 NT NT NT NT NT NT NT I 0.006 Arsenic,Dissolved trace NT NT NT NT NT NT NT I 0.01 Barium,Dissolved 0.041 NT NT NT NT NT NT NT I 1 Beryllium,Dissolved trace NT NT NT NT NT NT NT I 0.004 Boron, Dissolved NR NT NT NT NT NT NT NT I _ NE _Cadmium,Dissolved <0.002 NT NT NT NT NT NT NT I 0.005 Chromium,Total Dissolved 0.0007 NT NT NT NT NT NT NT I 0.05 Chromium Hexavalent <0.01 NT NT NT NT NT NT NT I NE Cobalt,Dissolved <0.003 NT NT NT NT NT NT NT I NE Copper,Dissolved <0.004 NT NT NT NT NT NT NT I 1/0.05** Iron,Dissolved 0.304 NT NT NT NT NT NT NT I 0.3/0.1** Lead, Dissolved trace NT NT NT NT NT NT NT _ I 0.015 Manganese,Dissolved 0.012 NT NT NT NT NT NT NT I 0.05/0.02** Mercury,Dissolved <0.0001 NT NT NT NT NT NT NT I 0.002 _Nickel,Dissolved <0.007 NT NT NT NT NT NT NT I 0.1 Selenium,Dissolved trace NT NT NT NT NT NT NT I 0.05 Silver,Dissolved <0.001 NT NT NT NT NT NT NT I 0.1 ND=not detected Thallium,Dissolved <0.001 NT NT NT NT NT NT NT I 0.002 NE=not established Tin,Dissolved <0.001 NT NT NT NT NT NT NT I NE * =secondary standard Vanadium,Dissolved 0.02 NT NT NT NT NT NT NT I NE NT=not tested Zinc,Dissolved 0.014 NT NT NT NT NT NT NT 1 5 1=insufficient data