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Groundwater Monitoring <br /> Well Installation and <br /> ARCADIS Sampling Work Plan <br /> PG&E McDonald Island <br /> Compressor Station <br /> groundwater sample submitted for analysis with silica gel treatment(SGT).Without <br /> SGT, TPH-d was detected at a concentration of 260 pg/L. <br /> September 2011 to June 2012—Continued Groundwater Monitoring <br /> Three more groundwater monitoring events were completed at monitoring well MW-01 <br /> for groundwater evaluation purposes.The results from all four monitoring events were <br /> generally consistent with TPH-d concentrations exceeding the WQO when the samples <br /> were not analyzed with SGT and lower TPH-d concentrations when the samples were <br /> analyzed with SGT. <br /> Modonald Island Addtl MW Installation Work Plan D— 4 <br />