COMPLIANCE INFO - Laserfiche WebLink

Home Browse Search

Californig pgional Water Quality Cor A Board Central Valley Region ; Karl E. Longley, ScD,P. E., Chair 1685 G Street,Fresno,Cahl'ornia 93706 Matthew Rodriquez (559)445-5116• FAX(559)445-5910 Edmund C.Brown Jr. Secretary for http://mk-A.waterboards.ca.gov/centralvallev Governor Environmental Protection FACT SHEET PROPOSED NO FURTHER ACTION REQUIRED, CATELLUS PROJECT, HISTORICAL CRUDE OIL PIPELINES, TRACY, SAN JOAQUIN COUNTY This Fact Sheet is to inform interested parties of the Central Valley Regional Water Quality Control Board's (Central Valley Water Board) consideration of No Further Action Required for the referenced Chevron Environmental Management Company (Chevron) Catellus project (Site) and to request comments on the proposed action. The Site location is noted on the enclosed Figure. The historical pipelines leaked and residual crude oil affected soil and groundwater are present beneath the historical Old Valley Pipeline (OVP) and the Tidewater Associated Oil Company (TAOC) pipelines (OVP and TAOC are Chevron predecessor companies). From the early 1900s to the late 1960s the pipelines transported crude oil from Kern County oil fields to San Francisco area refineries. The former OVP and TAOC pipelines were within the West Byron Road and/or the Union Pacific Railroad tracks right-of-way easements. During 2003, a release of non-hazardous crude oil was discovered from the historical OVP/TAOC pipelines. Between 2003 and 2008, borings were drilled and soil and groundwater samples were collected and submitted for analysis by a California certified analytical laboratory. Soil and groundwater has been affected by total petroleum hydrocarbons as crude oil (TPHc), low concentrations of certain polynuclear aromatic hydrocarbon (PAH) compounds, and benzene, toluene, ethylbenzene, and xylenes (BTEX). These analytes are commonly detected by laboratory analysis when testing for crude oil compounds in soil and/or groundwater. Subsequent fuel fingerprint evaluation by the laboratory determined that the petroleum hydrocarbons present are consistent with weathered San Joaquin Valley crude oil. In April 2009, Central Valley Water Board staff concurred that crude oil affected soil and groundwater had been delineated, and Chevron submitted a Human Health Screening Evaluation .(HHSE) dated October 2010. The HHSE report concluded that the residual crude oil detected in soil and groundwater is limited in extent, and the majority lies beneath/within the West Byron Road UPRR tracks easements. The HHSE report determined that the cancer risk for a hypothetical future onsite resident was 4E-06, which is within the range of risk management of 1 E-06 to 1 E-04. The HHSE findings indicated that the risk scenario considered is a conservative estimate and actual risks are believed to be much lower. Exposure to petroleum hydrocarbons in shallow soil should not result in an unacceptable health risk for a resident adult or child. The total potential non-cancer hazard from oral, dermal, and inhalation exposure to onsite soils of 0.003 is below the acceptable hazard index of 1. The most likely future onsite use will be for highway and/or utility corridor maintenance activities. California Environmental Protection Agency eel Recicled Paper