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Mr. Ed Ralston 2 - 20 October 2008 <br /> Former Union Oil Bulk Plant, Tra y <br /> 2. ConocoPhillips needs to analyze the floor and sidewall soil samples from the excavations <br /> prior to backfilling to ensure that all contaminated soil has been removed. Depth to <br /> groundwater is eight feet below ground surface, which is near the total depth proposed for <br /> the excavations. If ConocoPhillips encounters groundwater during excavation activities, it <br /> needs to pump out the water and dispose of it properly. In addition, if water re-enters the <br /> excavation, ConocoPhillips needs to collect a grab sample and submit it to the laboratory <br /> for analysis of petroleum hydrocarbons and include the results in the report of findings. <br /> 3. The report of findings needs to show the dimensions of the excavations and the soil <br /> sample locations. <br /> 4 ConocoPhillips needs to analyze the soil gas samples for the leak detection compound in <br /> addition to the petroleum compounds and include this information on the analytical data <br /> tables. <br /> In summary, by 13 March 2009, please submit a reportof findings for this work. If you have <br /> any questions, you may contact me by phone at (916) 464-4819 or by email at <br /> kshelton(a waterboards.ca.gov. <br /> '� v <br /> KRISTI SHELTON <br /> Water Resources Control Engineer <br /> Aboveground Tanks Cleanup Unit <br /> cc: Ms. Margaret Lagorio, San Joaquin County Environmental Health Department, Stockton <br /> Mr. Mark Bare, Stantec Consulting Corp., Rancho Cordova <br />