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Workplan for Supplemental Investigation <br /> 2005 Navy Drive, Stockton, CA <br /> January 2, 2013 <br /> Page 10 of 12 <br /> detected in them, these data will indicate an offsite upgradient source and <br /> demonstrate that the contamination did not originate from the property at 2005 Navy <br /> Drive. If CVOCs are found in the shallow soil gas samples and in the proposed grab <br /> groundwater samples, then the contamination is likely to have originated on the <br /> property. The additional grab groundwater locations, GG-10 through GG-16, will only <br /> be sampled if necessitated by the initial data from the nine grab groundwater <br /> samples and based on the soil gas results from the vadose zone. <br /> All fieldwork will be overseen by a California-registered Professional Geologist and <br /> will conform to all relevant environmental regulations and practices. <br /> Risk-Based Decisions, Inc. <br />