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HISTORICAL SUMMARY OF MONITORING RESULTSVADOSE ZONENORTH COUNTY SANITARY LANDFILLVZ-4Units: mg/l, unless notedSample DesignationSampling DateMonitoring and Field ParametersQuarterly Monitoring and Field ParametersTotal Dissolved SolidsChlorideSulfateNitrate NitrogenpH (std. units)Electrical Conductivity (umhos/cm)Alkalinity as CaCO3Bicarbonate Alkalinity as CaCO3Carbonate Alkalinity as CaCO3SulfidesCyanidesTotal Organic CarbonConstituents of ConcernVolatile Organic Compounds (ug/l)1,1-DichloroetheneCarbon Disulfide1,1-DichloroethaneTrichlorofluoromethane1,1,1-trichloroethaneTrichloroetheneTetrachloroetheneAcetoneMethylene ChlorideChloroformTrichloroethyleneBenzeneTolueneEthylbenzenem/p Xyleneo-XyleneChloroformCarbon Disulfide1,1-dichloroethenTetrachloroetheneMetalsAluminum, TotalAntimony, TotalArsenic, TotalBoronBarium, TotalBeryllium, TotalCadmium, TotalChromium, TotalChromium HexavalentCobalt, TotalCopper, TotalIron, TotalLead, TotalMagnesium, TotalManganese, TotalNickel TotalSilver, TotalSelenium, TotalVZ-4A/B VZ-4A/B VZ-4A/B VZ-4A/B10/27/98 3/2/00 1/10/01 4/12/01NA NA 726 762277 NA 33.4 34.5130 NA 47.7 52.11.30 NA 0.88 3.41NA 7.19 NA 7.40NA 1,209 NA 240NA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA <0.0018NA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NANA NA NA NA144 of 146