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G-2 HISTORICAL SUMMARY OF ANALYTICAL RESULTS,NORTH COUNTY SANITARY LANDFILL <br /> Sampling Date 8/12/87 10/31/89 11/15/90 1/25/91 4/10/91 7/22/91 10/31/91 1/9/92 4/2/92 7/2/92 10/1/92 1/4/93 8/20/93 10/5/93 1/4/94 4/8/94 7/1/94 <br /> General Water Quality Parameters mg/-1 <br /> Temperature(°C) NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br /> Chloride 12 17 NR 7 6.9 7 12 18 12 7 7 7 7 6 13 5 7 <br /> - Nitrate Nitrogen _ 0.96 1.4 1.2 1.6 4.1 1 - 1.4 1.4 1.6 1.3 1.4 _ 1.4_ 1.4 1.4 1.3 1.1 1.8 1.3 <br /> Total Dissolved Solids 210 240 230 170 210 190 150 250 190 210 170 200 200 200 200 200 200 <br /> Sulfate 19[1] NR <8 <8 <8 <8.0 <8 <8 <8 <5 <5 <5 <5 <5 <8 <8 <8 <br /> pH(std.units) 6.98 7.60 7.34 7.41 7.32 7.01 6.82 7.37 6.89 6.50 6.81 6.54 7.20 6.73 6.88 7.49 7.92 <br /> _ Electrical Conductivity(umhos/cm) 250 290 216 207 226 267 213 251 221 258 _214 206 247 204 199 252 240 <br /> Turbidity(NTU)field NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br /> Total Organic Carbon 6.4[1] NT <0.5 0.9 <0.5 _<_0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Alkalinity,Bicarbonate NT NT 84 80 82 82 83 85 94 88 77 81 85 89 87 75 88 <br /> Alkalinity,Carbonate NT NT <1 <1 <1 <5 <5 <5 <5 <5 <5 <5 5 <5 <5 <5 <5 <br /> Total Alkalinity NT NT 84 80 82 82 83 85 94 88 77 81 85 89 87 75 88 <br /> Cyanide NT NT NT NT NT_ NT NT NT NT NT NT NT _ NT NT NT NT <br /> Sulfide -_ NT NT <0.1 0.2 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1- <0.1 <br /> [1]Data point appears anomalous. underline=exceeds concentration limit <br /> Volatile Organic Compounds(ug/1) <br /> Bromoform ND ND ND ND <0.5 1.1* ND ND ND ND ND ND ND ND ND ND ND <br /> Isopropylbenzene ND ND ND ND ND 0.18* ND ND ND ND ND ND ND ND ND ND ND <br /> Naphthalene <2 ND ND 0.297* ND 0.40* ND ND ND ND ND ND ND ND ND ND ND <br /> 1,1,2,2-tetrachloroethane ND ND ND ND ND 0.18* ND ND ND ND ND ND ND ND ND ND ND <br /> 1,1,2-trichloroethane ND ND ND ND 0.4* NT ND ND ND ND ND ND ND ND ND ND ND <br /> Trichloroethene(TCE) ND ND ND ND ND 0.20* ND ND ND ND ND ND ND ND ND ND 0.121* <br /> Trichlorofluoromethane ND ND ND ND ND 0.10* ND ND ND ND ND ND ND ND ND ND ND <br /> *=Trace Concentration <br /> Semivolatile Organic Compounds(uq/I) <br /> Bis(2-ethylhexyl)Phthalate <2 NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT NT <br /> Metals M9/-I <br /> Aluminum,Dissolved <0.5 0.14 <0.05 NT NT NT <0.05 NT NT NT 0.077 NT NT <0.05 NT NT NT <br /> Antimony,Dissolved <0.5 <0.05 <0.05 NT NT NT <0.05 NT NT NT <0.05 NT NT <0.05 NT NT NT <br /> __-- ---------------- <br /> Arsenic,Dissolved <0.005 <0.005 <0.005 NT NT NT <0.005 NT NT NT <0.005 NT NT <0.005 NT NT NT <br /> Barium,Dissolved 0.02 0.041 0.045 NT NT NT 0.045 NT NT NT 0.046 NT NT 0.045 NT NT NT <br /> Beryllium, Dissolved <0.01 <0.005 <0.005 NT NT NT <0.005 NT NT NT <0.005 NT NT NT NT NT <br /> Boron,Dissolved 0.03 <0.05 <0.05 NT NT NT <0.05 NT NT NT <0.05 NT NT NT NT NT <br /> Cadmium, Dissolved <0.05 <0.002 <0.003 NT NT NT <0.003 NT NT NT <0.003 NT NT <0.003 NT NT NT <br /> Chromium,Total Dissolved <0.05 0.007 <0.005 NT NT NT <0.005 NT NT NT <0.005 NT NT <0.005 NT NT NT <br /> Chromium Hexavalent NT NT 0.24 NT NT NT <0.01 NT NT NT NT NT NT <0.010 NT NT NT <br /> Cobalt, Dissolved <0.05 <0.01 <0.01 NT NT NT <0.01 NT NT NT <0.01 NT NT NT NT NT NT <br /> Copper,Dissolved <0.05 <0.01 <0.01 NT NT NT <0.01 NT NT NT <0.01 NT NT <0.01 NT _NT NT <br /> ------ <br /> Iron, Dissolved 0.12 0.08 <0.02 0.31 0.16 <0.05 <0.02 <0.05 <0.05 <0.05 <0.02 <0.05 <0.05 <0.02 0.123 <0.02 0.02 <br /> Lead, Dissolved <0.2 <0.002 <0.002 NT_ NT NT <0.002 NT NT NT <0.002 NT NT <0.002 NT NT NT <br /> Manganese,Dissolved <0.05 <0.005 0.005 NT NT NT <0.005 NT NT NT <0.005 NT NT <0.005 NT NT NT <br /> Mercury,Dissolved <0.0005 <0.0005 <0.0005 NT NT NT <0.0005 NT NT NT <0.0005 NT NT <0.0005 NT NT NT <br /> Nickel,Dissolved <0.05 <0.02 <0.02 NT NT NT <0.02 NT NT NT <0.02 NT NT <0.02 NT NT NT <br /> Selenium,Dissolved <0.005 <0.005 <0.005 NT NT NT <0.005 NT NT _ NT <0.005 NT NT <0.005 NT NT NT <br /> Silver,Dissolved <0.01 <0.01 <0.01 NT NT NT <0.01 NT NT NT <0.01 NT NT <0.01 NT NT NT <br /> Thallium,Dissolved <0.5 <0.005 <0.005 NT NT NT <0.005 NT NT NT <0.005 NT NT <0.005 NT NT NT <br /> Tin,Dissolved <0.1 <0.05 <0.05 NT NT NT <0.05 NT NT NT <0.05 NT NT NT NT NT NT <br /> Vanadium,Dissolved <0.1 0.02 0.02 NT NT NT 0.019 NT NT NT 0.018 NT NT NT NT NT NT <br /> Zinc,Dissolved 1.1 <0.01 0.01 NT NT NT <0.01 NT NT NT 0.014 NT NT <0.01 NT NT NT <br />