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b <br /> GEOMATRIX <br /> Mr. Robert Mihalovich <br /> Chevron Environmental Management Company <br /> May 9, 2002 <br /> Page 6 <br /> While the total risk is in excess of the benchmark target of 1x10-6. it falls,within the range <br /> Of Ix10-4 to 1x10-6 leaving the acceptability of the risk as a risk management decision. <br /> Limitations on the data, lack of vertical extent delineation and lack of data from the former <br /> gasoline station area to address the source of BTEX, create uncertainty.in the estimated <br /> risks. <br /> Comment noted. The vertical extent and gasoline station area issues were addressed under <br /> responses to Specific Comments 1 and 2. <br /> If you have questions or require further information,please contact either of the undersigned. <br /> Sincerely yours, <br /> GEOMATRIX CONSULTANTS, INC. <br /> Robert H. Cheung Gary R. Foote, R.G. <br /> Senior Toxicologist Senior Geologist <br /> RHC/GFR/pp <br /> I:\Doc_Safc\7000s\7243.001\Resp to DTSC Comm.doc <br /> Figure 1 Soil Boring Locations and Cross Section Location <br /> Figure 2 Cross Section A-A' <br /> Attachment A Table and Figure from Confirmation Sampling at Proposed Percolation/ <br /> Retention Ponds, prepared by Geomatrix Consultants, Inc. October 8, 2001. <br />