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r <br /> Introduction <br /> 1 <br /> This report is submitted to the Central Valley Regional <br /> Water Quality Control Board to document the results of the <br /> ' investigation of potential new sources of hydrocarbon contamina- <br /> tion at the Tesoro Refining, Marketing and supply Company in <br /> Stockton, California. The report describes the field investiga- <br /> tions undertaken by Tesoro to assess potential new sources of <br /> hydrocarbon contamination and the results of the monitoring <br /> program conducted at the site. It concludes with an evaluation <br /> of the data collected during the investigation. <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> - 1 - <br />