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a <br /> Department of Toxic Substances Control <br /> Edwin F. Lawry, Director .'.' <br /> 10151 Croydon Way, Suite 3 <br /> Winston H. Hickoz Sacramento, California 95827-2106 <br /> Gray Davis <br /> Agency Secretary Governor <br /> California Environmental RECEIVED <br /> Protection Agency oh Mn EmimnMpMl MgmL Oo, <br /> April 27, 2000 MAYO 12000 <br /> K. L. H. <br /> Ms. Katie Hower <br /> Chevron Environmental Management Company <br /> 6001 Bollinger Canyon Road - <br /> San Ramon, California 94583 <br /> REVIEW OF "SOIL AND GROUNDWATER INVESTIGATION AND SCREENING <br /> HEALTH RISK ASSESSMENT OF THE OLD VALLEY PIPELINE RIGHT-OF-WAY" <br /> POMBO PROPERTY <br /> Dear Ms. Hower. <br /> The Department of Toxic Substances Control (DTSC) has completed its review of the <br /> subject report for the pipeline right-of-way, Pombo property, prepared by Geomatrix <br /> Consultants and submitted by Chevron. The former pipeline transported heavy <br /> petroleum (crude and fuel oil)from Bakersfield to Richmond, California, from the early <br /> 1900s to the 1950s. This report documents the hazardous substance characterization <br /> of soil and groundwater at the site. The purpose of the characterization was to gather <br /> data to assess the lateral and vertical extent of petroleum hydrocarbon-affected soil <br /> along the pipeline right-of-way, to evaluate groundwater quality, and to evaluate <br /> potential human health risks posed by residual petroleum hydrocarbons. The Site is <br /> proposed for a change of land use for unrestricted use. <br /> The subject report was reviewed by Mr. David L. Berry, Ph.D., DTSC Staff Toxicologist <br /> (see internal memorandum dated March 14, 2000). DTSC concurs that the analytical <br /> data supporting this investigation appear adequate in both quantity and quality. The <br /> residual levels of petroleum-related hydrocarbons in the soils at the site are below <br /> levels that would constitute an unacceptable risk to human health and the <br /> environment. As with any real property, if previously unidentified contamination is <br /> discovered at the Site, additional assessment, investigation, and/or remediation may <br /> be required. <br /> t�0 W1tn1@iloml£8¢y�lA�a�sr <br />