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i <br />HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE AIR <br />NORTH COUNTY SANITARY LANDFILL <br />SG -8 Shallow <br />Sample Type: Air <br />Sampling Date 11/14/03 2/12/04 5/7/04 7/22/04 11/9/04 2/10/05 9/30/05 <br />Monitoring and Field Parameters <br />Methane oncentration (percent) <br />Benzene <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br />Benzyl o e <br /><, <br /><. <br /><. <br /><, <br /><, <br /><, <br />romome ane <br /><0.5 <br /><0.5 <br /><03 <br /><03 <br /><0, <br /><0.5 <br /><0.5 <br />Carbon etra one <br /><, <br /><, <br /><, <br /><, <br /><, <br /><,5 <br />Chlorobenzene <br /><. <br /><, <br /><,5 <br /><, <br /><, <br /><, <br /><,5 <br />roe ane <br /><, <br /><,5 <br /><,5 <br /><. <br /><, <br /><, <br /><.5 <br />CN-000—rm <br /><, <br />,5 <br /><, <br /><, <br /><, <br /><, <br /><0.5 <br />Chloromethane <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.6 <br /><0.5 <br />Not equire <br />NT = Not Tested <br />* = Trace Concentration <br />{1) Parameter also detected in one or more quality control Wanks. <br />SG -8, Shal; Printed: 1/25/2006 14 of 17 <br />