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Workplan for Supplemental Investigation <br /> 2005 Navy Drive, Stockton, CA <br /> January 2, 2013 <br /> Page 8 of 12 <br /> or 3.17 feet below sea level. A reading of -3.17 represents a lower elevation than - <br /> 2.93. Similarly, for December 2011, the groundwater level at MW-1 was -4.57 (4.57 <br /> feet below sea level) and the groundwater level at MW-3 was -5.61 (5.61 feet below <br /> sea level). Therefore, the measured groundwater gradient is indeed to the <br /> approximate south which is consistent with neighboring sites, not to the northwest as <br /> reported in the existing KR Environmental report. <br /> As the groundwater flow is to the south-southeast, taking samples upgradient of the <br /> recently destroyed monitoring wells would determine if the DCE is coming from an <br /> upgradient offsite source. <br /> Risk-Based Decisions, Inc. <br />