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Mr. Maurice Benson • 18 February 2009 <br /> Defense Logistics Agency <br /> investigation indicate that these plumes do not pose a threat to downgradient, privately <br /> owned, potable supply wells." <br /> Another example of such statements is the second sentence of Section ES.3.1: <br /> "Preliminary results from the 2007/2008 CPT/HydroPunch investigation confirm that <br /> there is no evidence that the plumes are continuing to migrate toward privately owned <br /> potable wells even though contaminant plume capture is incomplete west of the depot <br /> boundary. <br /> Any plume that has migrated beyond the capture zone of the groundwater extraction and <br /> treatment systems at the Sharpe site poses a threat. While such a plume may not be an <br /> immanent threat, it is none-the-less, a threat. Rather than stating that plumes do not pose <br /> a threat, the Draft Report should explain that the work performed to date, and planned <br /> future work are underway to address the potential threats by completing necessary <br /> assessment work and implementing actions to guard against eventual impacts. <br /> 3. The Draft Report indicates that the plumes are being contained by the groundwater . <br /> extraction systems or by natural attenuation mechanisms. The role of natural attenuation <br /> has not been verified. Evidence of this should be collected and presented in documents in <br /> support of a Record of Decision Amendment. <br /> If you have any questions, please contact me at (916) 464-4675, or by email at <br /> jbrownell@waaterboards.ca.gov. <br /> K <br /> James R. Brownell, P.G. <br /> Associate Engineering Geologist <br /> cc: Mr. Phillip Ramsey, USEPA Region 9, San Francisco <br /> Mr. Peter MacNicholl, DTSC Region 1, Sacramento <br /> Mr. Had r, Knoll, San Joaquin County Health Department, Stockton <br /> Mr. Rich Howard, TechLaw, Inc., Sacramento <br /> Mr. Brian Renaghan, AFCEE, San Antonio, Texas <br /> Mr. Michael Thomas, URS, Sacramento <br /> Mr. John Anthony, Noblis, Greenwood Village, Colorado <br />