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Mr. Maurice Benson <br /> February 24, 2009 <br /> Page 3 <br /> 10. Figure 7-2, Tetrachloroethene (PCE) Comparison Map; Concentrations <br /> presented for the figure range from the ACL of 0.5 pg/L to 5 pg/L. A quick review <br /> of the time series maps does not present the higher PCE concentrations <br /> measured since only one color represents PCE levels above 5 pg/L. DTSC <br /> recommends that additional colors are used in the figure to present a more <br /> accurate depiction of PCE contaminant distributions found throughout DDJC- <br /> Sharpe. <br /> If you have any questions or concerns regarding this letter, please contact me at <br /> (916) 255-3713 or e-mail to pmacnich(abdtsc ca oov <br /> Sincerely, /,� <br /> �e /'�/d %4/5/ <br /> Peter MacNicholl, P.E. <br /> Hazardsous Substances Engineer <br /> Sacramento Office <br /> Brownsfields and Environmental Restoration Program <br /> cc: Mr. Mike Thomas <br /> URS Corporation <br /> Crown Corporate Center <br /> 2870 Gateway Oaks Drive, Suite 300 <br /> Sacramento, California 95833 <br /> Mr. Rich Howard <br /> TechLaw, Incorporated <br /> 921 11th Street, Suite 502 <br /> Sacramento, California 95814 <br /> Mr. Michael Work (SFD-8) <br /> U.S. Environmental Protection Agency <br /> Region IX <br /> 75 Hawthorne Street <br /> San Francisco, California 94195 <br />