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` Department of Toxic Substances Control <br /> Edwin F.Lowry,Director ., . <br /> 400 P. Street,P.O.Box 806 <br /> Sacramento,California 95812-0806 <br /> Winston H.Hickox Gray Davis <br /> Secretary for Governor <br /> Environmental <br /> Protection MEMORANDUM <br /> TO: Mary Misemer <br /> Site Mitigation Branch <br /> 10151 Croydon Way <br /> Sacramento, California 95827-2106 <br /> FROM: David L. Berry, Ph.D.. aa) <br /> Staff Toxicologist <br /> Human and Ecological Risk Division (HERD) <br /> DATE: November 9, 1999 <br /> SUBJECT: <br /> PCA: 12020 Site: 101220 <br /> Background <br /> This report details the field activities and a"screening health risk assessment"for a property <br /> located in San Joaquin County, near the City of Tracy. Chevron's former Old Valley Pipeline was <br /> located in a right-of-way along the southern edge of the site adjacent to the Southern Pacific rail- <br /> road alignment. The former pipeline transported heavy petroleum products (crude and fuel oil) <br /> from Bakersfield to Richmond, California, from the early 1900s to the 1950s. The site is adjacent to <br /> another site where known petroleum hydrocarbon releases occurred. This investigation was de- <br /> signed to assess the lateral and vertical extent of petroleum hydrocarbon-affected soil along the <br /> historic right-of-way, to evaluate groundwater quality, and to evaluate human health risks posed by <br /> the residual petroleum hydrocarbons in the soil. <br /> Field activities included the advancement of 16 soil borings and the collection of soil and grab <br /> groundwater samples from selected borings. Environmental samples were analyzed for TPH gas, <br /> TPH diesel, TPH crude using USEPA Method 8015, BTEX using USEPA Method 8021 B, and <br /> PAHs using USEPA Method 8270 SIM. <br /> Document Reviewed <br /> We reviewed"Soil and Groundwater Investigation and Screening Health Risk Assessment <br /> of the Old Valley Pipeline Right-of-Way" Mansfield Property (APN 209-270-30), Tracy, California. <br /> This document, dated September 1999, was prepared by Geomatrix Consultants, 2101 Webster <br /> Street, 12"' Floor, Oakland, California 94612, contractors to Chevron Environmental Management <br /> Company. HERD received a work request to review this document on October 19, 1999. <br /> Scope of Review <br /> The Soil and Groundwater Investigation and Screen Health Risk Assessment of the Old <br /> Valley Pipeline Right-of-Way was reviewed for scientific content and sufficiency to'support a <br /> California Environmental Protection Agency <br /> G Printed on Recycled Paper <br />