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TABLE 17 <br /> RESULTS FOR PID CONCENTRATIONS COLLECTED DURING THE REMEDIAL INVESTIGATION <br /> PG&E Former Tracy MGP Site <br /> Tracy, California <br /> c <br /> 0 <br /> r <br /> c <br /> Sample Sample Depth <br /> ID Location Matrix (feet bgs) Sample Date c <br /> U <br /> O <br /> a <br /> ppm <br /> Dl-1-6 D1 Soil 6 7/8/2008 13.5 <br /> Dl-1-8 D1 Soil 8 7/8/2008 0.4 <br /> D2-SG1-1 D2 Soil 1 7/10/2008 0.0 <br /> D3-1-1 D3 Soil 1 7/9/2008 501 <br /> D3-1-3 D3 Soil 3 7/9/2008 226 <br /> D3-1-5 D3 Soil 5 7/9/2008 188 <br /> D3-1-8 D3 Soil 8 7/9/2008 33.1 <br /> E2-1-1 E2 Soil 1 7/8/2008 1.1 <br /> E2-1-3 E2 Soil 3 7/8/2008 5.1 <br /> E2-1-5 E2 Soil 5 7/8/2008 0.5 <br /> E2-1-8 E2 Soil 8 7/8/2008 0.5 <br /> E2-2-1 D2 Soil 1 7/9/2008 1.8 <br /> E2-2-3 D2 Soil 3 7/9/2008 0.7 <br /> E2-2-5 D2 Soil 5 7/9/2008 1.5 <br /> E2-2-8 D2 Soil 8 7/9/2008 0.5 <br /> E3-1-1 E3 Soil 1 7/8/2008 1.4 <br /> E3-1-3 E3 Soil 3 7/8/2008 1.1 <br /> E3-1-5 E3 Soil 5 7/8/2008 0.9 <br /> E3-1-10 E3 Soil 10 7/8/2008 2.8 <br /> E3-1-15 E3 Soil 15 7/8/2008 226.0 <br /> E3-2-1 E3 Soil 1 4/8/2009 1.2 <br /> E3-2-3 E3 Soil 3 4/8/2009 1.0 <br /> E3-2-5 E3 Soil 5 4/8/2009 1.0 <br /> E3-2-8 E3 Soil 8 4/8/2009 1.5 <br /> E3-2-10 E3 Soil 10 4/8/2009 1.9 <br /> E3-2-15 E3 Soil 15 4/8/2009 -- <br /> PID = Photoionization Detector <br /> ppm = Parts per million <br /> -- = Concentration not obtained <br /> Note: PID was calibrated daily using 100 ppm Isobutylene calibration gas. PID was used only if concentration of cal- <br /> gas was within 5% of span value. <br /> Page 2 of 2 <br />