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TABLE 4 - Continued <br /> Second Semester 2009 Leachate Module 1 <br /> Foothill Sanitary Landfill <br /> (Units mg/I unless noted) <br /> Sampling Designation L-1 <br /> Sampling Date 8/18/2009 <br /> Metals ug/L <br /> Lead 0.91 <br /> Manganese 6800 <br /> Nickel 48 <br /> Selenium 0.82* <br /> Silver ND <br /> Tin ND <br /> Thallium ND <br /> Vanadium 3.4* <br /> Zinc 20* <br /> ND = Not Detected <br /> * =Trace concentration (estimated value) <br /> Foothill Sanitary Landfill 21 Department of Public Works/Solid Waste <br /> 2nd Semester and Annual 2009 Groundwater Monitoring County of San Joaquin—January 31,2010 <br />