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• 1 <br /> Mr. Marshall Cloud <br /> April 18, 2006 <br /> Page 2 <br /> Comments <br /> 1.) Page 1, section 1.3, third bullet; States that a majority of the footprint of the NWC <br /> plume is within the DDJC-owned property, thus allowing unlimited access <br /> anytime of the year for that portion. Describe in the report how DDJC-Tracy will <br /> gain access to portions of the plume which resides beneath the private property <br /> adjacent to DDJC-Tracy if access is required for plume monitoring. <br /> 2.) Page 2, section 2.1.2, second sentence; States that DDJC-Tracy does not <br /> posses any data to support the hypothesis that biodegradation is contributing to <br /> the dieldrin loss in ground water at DDJC-Tracy. Until this degradation <br /> mechanism is supported with site specific data, the report should not mislead the <br /> reader into believing it is a readily occurring mechanism at DDJC-Tracy. Please <br /> clarify that biodegradation at DDJC-Tracy has not been confirmed by quantifiable <br /> scientific data. <br /> 3.) Page 4, section 3.1.3, last sentence; The statement that soil particulates in <br /> ground water samples from the 2005 CPT investigation may have contained <br /> sorbed dieldrin and biased higher concentrations of dieldrin in ground water <br /> sample results is rather subjective and unsubstantiated. Include in the report <br /> any technical reference material supporting the claim that soil particulates with <br /> sorbed dieldrin have the potential to elevate diedrin results in ground water <br /> samples. <br /> 4.) Page 4, section 2.2.3, last sentence; Please rephrase this sentence as it is <br /> initially unclear to the reader as to whether the Kos in brackets is referring to <br /> diedrin or trichloroethene. <br /> If you have any questions or comments on this letter, please feel free to contact me at <br /> (916) 255-3713 or e-mail at pmacnich(a)dtsc.ca.gov <br /> Sincerely, <br /> Peter MacNicholl <br /> Remedial Project Manager <br /> Federal Facilities Unit <br />