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Svc <br /> Science Applications International Corporation <br /> An Employee-Owned Company <br /> September 11,2003 <br /> Mr. M. Scott Mansholt <br /> Chevron Environmental Management Company <br /> 6001 Bolinger Canyon Road <br /> Room K2050 <br /> San Ramon,California 94583 <br /> Subject: Former Lyoth Loading Station <br /> Letter Response To Comments On The Health Risk Assessment, <br /> Office of Environmental Health Hazard Assessment(OEHHA), <br /> Department of Toxic Substances Control (DTSC) <br /> Dated April 18, 2002 <br /> Dear Mr.Mansholt, <br /> At the request of Chevron Environmental Management Company(ChevronTexaco), Science <br /> Applications International Corporation(SAIC)has prepared this letter response to OEHHA <br /> comments addressing the Health Risk Assessment(HRA) submitted by Geomatrix Consultants <br /> (Geomatrix)dated June 1999 and Addendum to HRA dated February 26, 2002. <br /> In a meeting dated January 16,2002, OEHHA addressed three issues of the HRA concerning 1) <br /> the adequacy of the characterization of the distribution of benzene, 2)the model used to estimate <br /> indoor exposure to volatile compounds,and 3)the alpha level used in calculating the confidence <br /> interval for polycyclic aromatic hydrocarbons(PAHs). Geomatrix addressed the OEHHA <br /> comments and prepared an addendum dated February 26, 2002. <br /> Based on the February 26, 2002, addendum,OEHHA prepared the April 18,2002 memorandum, <br /> "Response To Comments On The Health Risk Assessment, Former Lyoth Loading Station, Tracy, <br /> California." The memorandum indicated items discussed in the January 16, 2002 meeting had <br /> been addressed by Geomatrix in the February 2002 addendum. The OEHHA memorandum states <br /> that"the revisions reflecting these changes should be treated as an addendum to the risk <br /> assessment'. <br /> On behalf of ChevronTexaco, SAIC has documented the receipt and incorporation of the OEHHA <br /> comments into the February 2002 addendum to the HRA. Based on this, SAIC recommends <br /> ChevronTexaco request that OEHHA grant final approval of the June 1999 HRA and February <br /> 2002 Addendum for the subject site. If there are any questions pertaining to this request, do not <br /> hesitate to call me at(916)979-3741. <br /> Sincerely <br /> SCIENCEAPPLICATIONS INTERNATIONAL CORPPORATION <br /> 7. <br /> ToA.Del Frate <br /> Project Manager,R.G. <br /> 3800 Watt Avenue, Sacramento, California 95821 •(916)974-8800•(916)974-8830 <br /> Other SAIC Offices:Albuquerque,Colorado Springs,Dayton,Falls Church,Huntsville,Las Vegas,Los Attas,Los Angeles,McLean,Oak Ridge,Orlando,San Diego,Seattle,Tucson <br />