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EUMUNU G. BHUWN JH. '1� cuvennuH ntv;�j:a MATTIIEW FIUDRIOUEZ Water Boards LNVIRr)NM ENIAn 0RU1ti1TION Central Valley Regional Water Quality Control Board FACT SHEET PROPOSED NO FURTHER ACTION REQUIRED, US CAN —WELTY ROAD, HISTORICAL CRUDE OIL PIPELINES PROJECT, VERNALIS, 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) US Can -Welty Road project (Site) and to request comments on the proposed action. The Site location is noted on the Site Plan. From the early 1900's to the late 1960's, the Old Valley Pipelines (OVP) and the Tidewater Associated Oil Company (TAOC) pipelines conveyed heated San Joaquin Valley (SJV) crude oil from Kern County oil fields in the southern San Joaquin Valley, California, to refineries in the San Francisco Bay Area. Both sets of pipelines were removed from service by the early 1970's. Based on information provided by several Site investigations, the pipelines leaked and residual crude oil affected soil and groundwater has been determined present beneath the historical pipelines that passed through the Site primarily along and within/under the Union Pacific Railroad (UPRR) and California State Highway 33 right-of-way. The pipelines were in close proximity to each other and crossed through the Site southeast to northwest as shown on the enclosed Site Plan. Chevron completed soil and groundwater characterization activities at the Site and nearby vicinity beginning in about 1995 continuing through 2013. As part of the earlier investigations, 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 quantified as crude oil (TPHc). Subsequent fuel fingerprint evaluation by the laboratory determined that the petroleum hydrocarbons present are consistent with weathered SJV crude oil. Low concentrations of certain polynuclear aromatic hydrocarbon (PAH) compounds, and certain volatile organic compounds (VOCs) including toluene, ethylbenzene, and xylenes were reported at or slightly above laboratory method detection limits (MDLs) and/or applicable environmental screening levels. When present, these analytes are may be detected/reported by laboratory analysis when testing for crude oil compounds in soil and/or groundwater. In May 2012, Central Valley Water Board staff concurred that crude oil affected soil and groundwater had been delineated into the area as shown on the attached Site Plan, and Chevron submitted a Human Health and Ecological Screening Evaluation (HHESE) dated March 2012. The HHESE report concluded that the residual crude oil detected in soil and groundwater is limited in extent to the area shown on the Site Plan. The HHESE report determined that the constituents of potential concern (COPC) in soil were benzene, toluene, ethylbenzene, and xylenes (BTEX) and PAHs which were detected in the upper 3 meters (approximately 10 feet) below ground surface (bgs). The evaluation of COPCs within the upper 3 meters at the Site is consistent with approaches and methodology of guidance provided in the Preliminary Endangerment Assessment (PEA) Guidance Manual (California Environmental KAnL E. LONGLEY SCD, P.E.. CIIAIn I PAMCLA C. GrirnoN P.E., BGEE, CXCcuTlvt orrnorn 1605 C Street,Fresno,G'A 93706 1 www.waterboartls.ca.govicentralvallev CJ RECYCLED PAPER