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Michael Oliphant - 3 - 22 March 2012 <br /> Chevron <br /> TRY Offsite-West, Tracy <br /> • Sufficient shallow soil samples have been collected and analyzed for use in a human health risk <br /> assessment expected to be completed in the future. <br /> • Based on my review of AMEC's Report and the project files, I have the following comments: <br /> • I concur with AMEC's review/discussion of analytical results and fuel fingerprint chromatograms <br /> which indicates that TPHd detections reported in "deeper" groundwater are dissimilar to crude oil. <br /> The anomalous TPH chromatogram signatures appear unrelated to crude oil from the historical <br /> pipelines, and are considered to represent residual organic material as previously discussed by <br /> AMEC and Chevron staff. <br /> • I concur that crude oil affected soil and groundwater attributable to the historical TAOC pipeline <br /> leaks has been adequately delineated, that additional characterization is not needed, and the Site <br /> is a candidate for closure consideration. <br /> • A human health risk assessment is recommended as the next step prior to considering a No <br /> Further Action Required determination. A final determination cannot be made until a human <br /> health risk assessment is conducted and an ecological receptor evaluation is submitted for <br /> consideration. <br /> • Applicable environmental screening levels that are protective of groundwater, human health and <br /> ecological receptors (if any) with respect to current and/or anticipated future use(s) of the Site <br /> need to be considered. <br />