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Department of Toxic Substances Control <br /> CILfO�� <br /> Edwin F. Lowry, Director <br /> Winston H. Hickox 1001 I Street, 25th Floor, P.O. Box 806 <br /> Secretary for Sacramento, California 95812-0806 Gray Davis <br /> Environental Governor <br /> m <br /> Protection <br /> MEMORANDUM ED. <br /> V WAW <br /> COMPAW <br /> TO: Jerry Lile 7 20co <br /> 02 <br /> Project Manager <br /> Northern California Site Mitigation Branch IOVICH <br /> 8800 Cal Center Drive, 2nd Floor <br /> Sacramento, CA 95826-3200 <br /> Q, GTS—Lf7 <br /> FROM: Karen W. DiBiasio, Ph.D. 61x . � k/' <br /> Staff Toxicologist <br /> Science, Pollution Prevention and Technology Program <br /> Human and Ecological Risk Division <br /> DATE: July 11, 2002 <br /> SUBJECT: POMBO PROPERTY <br /> PCA Code: 12045 Site Code: 101269 WP: 11 <br /> BACKGROUND <br /> The Human and Ecological Risk Division (HERD) was requested to provide continuing toxicology <br /> and risk assessment support for the screening-level health risk assessment for the Pombo property by <br /> the Site Mitigation Program at the Region 1 Sacramento Office. The property is located in San <br /> Joaquin County, near the City of Tracy, California. Chevron's Old Valley Pipeline(OVP) was <br /> located in the railroad right-of-way adjacent to the northern boundary of the property. The former <br /> OVP transported heavy petroleum (crude and fuel oil) from the early 1900's to the 1950's. A gas <br /> station was formerly located along the southern border of the property. Contaminants detected in <br /> soil and/or groundwater include polynuclear aromatic hydrocarbons (PAHs), and benzene, <br /> ethylbenzene, toluene, and xylenes (BTEX). <br /> Previously HERD reviewed the September 1999, "Soil and Groundwater Investigation and <br /> Screening Human Health Risk Evaluation, Pombo Property(San Joaquin County APN 232-170- <br /> 07), 1755 West 11 th Street, Tracy, California" prepared for Chevron by Geomatrix Consultants. <br /> HERD's comments by Dr. David Berry were provided in a March 14, 2000 memorandum. Most <br /> recently HERD reviewed the December 2000, "Report of Additional Soil and Groundwater <br /> Investigation, Pombo Property (San Joaquin County APN 232-170-07), 1755 West I I1 Street, <br /> Tracy, California" and the October 4, 2001 "Results of the Updated Human Health Screening j <br /> Risk Evaluation, Pombo Property (San Joaquin County APN 232-170-07), 1755 West 1 1`h Street, <br /> i <br /> I <br /> Califcrn: a Environmental Protection Agency <br /> 4� Printed on Recycled Paper <br />