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Table 1 (Continued) <br /> Carbon <br /> Methane Oxygen Dioxide <br /> Sample Location Date (Percent) Percent (Percent) <br /> VP-4 (cont'd) 3/29/2007 3.9 11.9 9.2 <br /> 3/14/2007 10.6 1.6 22.8 <br /> 2/28/2007 7.2 0.1 22.5 <br /> 2/8/2007 7.6 0.0 23.0 <br /> 1/19/2007 6.0 0.3 22.0 <br /> 12/28/2006 7.6 0.2 24.6 <br /> 12/15/2006 5.5 0.6 27.1 <br /> 11/3012006 6.2 0.0 22.7 <br /> 11/17/2006 12.8 0.0 26.7 <br /> 11/1/2006 11.9 0.0 27.9 <br /> 10/19/2006 9.9 0.0 27.0 <br /> 9/29/2006 8.1 4.6 17.2 <br /> a Collected by San Joaquin County Environmental Health Department staff. <br /> ** The background methane concentration was measured to be 0.5% on September 29,2006. <br /> The methane concentration at this sample location was adjusted to be 0.5% less than the measured <br /> result. <br /> The background methane concentration was measured to be 0.1%on December 15,2006 and <br /> August 30,2007. <br /> NM-not measured <br /> Page 12 of 13 <br />