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California Regional Water Quality Control Board <br /> Central Valley Region <br /> Robert Schneider,Chair ��. <br /> Winston H.Hickox Gray Davis <br /> Secretaryfor Sacramento Main Office Governor <br /> [5) <br /> Environmental Internet Address: http://www.swrcb.ca.gov/—rwgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 LLLL V L L - <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> NOV 1 2 2002 <br /> 08 November 2002 ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> Ms. Penny Fottrell <br /> Chevron Environmental Management Company <br /> 6001 Bollinger Canyon Road <br /> P. O. Box 6012 — - <br /> San Ramon, CA 94583-0712 <br /> NO FURTHER ACTION FOR THE FILIOS/MANSFIELD PROPERTY, CHEVRON <br /> ENVIRONMENTAL MANAGEMENT COMPANY, TRACY, SAN JOAQUIN COUNTY <br /> We have reviewed the 20 September 2001 Low-Risk Closure Request,Filios (former Mansfield) <br /> Property, Tracy, California submitted by Chevron Environmental Management Company(Chevron). <br /> The report provides documentation to support no further action(NFA) for the site in accordance with <br /> Central Valley Regional Water Quality Control Board (Board) staff's Appendix B of the Tri-Regional <br /> Board Staff Recommendations for Preliminary Investigation and Evaluation of Underground Tank Sites. <br /> The Filios Property is southeast of the intersection of Byron and Grant Line Roads in Tracy. Chevron's <br /> former Old Valley Pipeline (OVP) was within the Byron Road right-of-way adjacent to the southwest <br /> boundary of the site. The former OVP transported heavy petroleum (crude and fuel oil) from Bakersfield <br /> to Richmond from the early 1900s to the 1950s. Investigations between October 1998 and November <br /> 2000 showed the presence of petroleum hydrocarbons in soil and groundwater at the site. The extent of <br /> total petroleum hydrocarbons (TPH) in soil is limited and found between five and 8.5 feet below ground <br /> surface (bgs). Concentrations of TPH as crude oil in soil ranged from non-detectable levels to 20,000 <br /> mg/kg. Concentrations of benzene, toluene, ethylbenzene, and xylene (BTEX) ranged from non- <br /> detectable to 13 mg/kg. Concentrations of acenaphthene, anthracene,benzo(g,h,i)perylene, chrysene, <br /> fluorene, phenanthrene, fluoranthrene, and pyrene in soil ranged from non-detectable to 2.7 mg/kg. <br /> Chevron conducted a human health risk screening evaluation to assess the potential human health risks <br /> associated with residual chemicals detected in soil. This evaluation was conducted based on the <br /> methodology in the Human Health Screening Evaluation section of the Department of Toxic Substances <br /> Control's (DTSC) Preliminary Endangerment Assessment (PEA) Guidance Manual. The PEA evaluation <br /> consists of a compilation of methods, models, and assumptions commonly used by Cal EPA and U.S. <br /> EPA to quantify risk and hazard at a site. Staff at the DTSC's Human and Ecological Risk Division <br /> (HERD), reviewed Geomatrix's screening risk evaluation and independently calculated a cancer risk and <br /> hazard index for the constituents in soils at the site. HERD concurred in a 9 November 1999 memo that <br /> the analytical data are adequate in both quantity and quality, and that the residual levels of petroleum- <br /> California Environmental Protection Agency <br /> (a Recycled Paper <br />