SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

EC-.' NU G.BROWN JP. r _ ll� OOVEPNOR c n u R o R N n 81CREi'Ew ARI RODflIOUEZ WaterBoards GNVIHONMFNTI PROTFC.TION Central Valley Regional Water Quality Control Board TO: Dane S. Johnson = `�l Senior Engineering Geologist FROM: C. Dean Hubbard Engineering Geologist Professional Geologist No. 6357 DATE: 11 April 2013 SUBJECT: NO FURTHER ACTION REQUIRED REQUEST—TRACY BYRON ROAD PROJECT, TRACY, SAN JOAQUIN COUNTY, CA Chevron Environmental Management Company (Chevron) submitted for consideration a No Further Action Required Request(NFAR), Tracy Byron Road(Report) project in central Tracy. The Report, dated 1 December 2011 was prepared for Chevron by Science Applications International Corporation Energy, Environment & Infrastructure, LLC (SAIC). The Report was submitted to Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff. My review comments are presented below. The historical Old Valley Pipeline (OVP) and Tidewater Associated Oil Company (TAOC; Chevron predecessor companies) pipelines were used for transport of San Joaquin Valley crude oil from Kern County oil fields to refineries in the San Francisco Bay area. The pipelines were used beginning in the early 1900's and reportedly, in the early 1940's transported Bunker C fuel oil from the refineries to locomotive fueling terminals near Tracy; all use was terminated by the late 1960's to early 1970's. The TAOC pipelines were located on the north-northeast side of the Union Pacific Railroad (UPRR) tracks and the OVP lines were along the south-southwest side of the project, primarily within the UPRR and West Byron Road easements. These easements also include active refined petroleum products pipelines. Both sides of the easements are bounded by residential housing developments, some commercial properties and a City of Tracy public park. California Interstate Highway 205 (1-205) transects the northwest end of the project. In early 2003, the City of Tracy installed the Westside Channel Outfall System (WCOS), an approximately 7,000 feet long storm drain beneath West Byron Road. The Tracy Byron Road -WCOS project (Site) extended from Van Sosten Road at the west end to Corral Hollow Road on the east end. During the excavation activities, non-hazardous crude oil impacted soil and groundwater was encountered at the project. After completion of the WCOS, Chevron's consultants began investigating crude oil impacted soil and groundwater encountered during the storm drain excavations. It was determined that the crude oil was attributable to leaks from the historical OVP and/or TAOC pipelines located along the West Byron Road -WCOS project. Soil and groundwater investigations were conducted with regulatory oversight provided by Central Valley Water Board staff. Between 2003 and 2010, borings were drilled, soil and groundwater samples were collected and submitted for analysis by a California certified analytical laboratory. Analytical laboratory fuel fingerprint evaluation determined that the leaks from the historical pipelines are consistent with weathered San Joaquin Valley crude oil. Three separate areas of affected soil/groundwater have been defined. Areas 1, 2, and 3 are described at approximately 200 by 1,400 feet, 375 by 2,000 feet, and 200 by 650 feet, respectively at the northwest, central, and on the southeast ends of the project. r.....,. I : •n. :- S:.G. P.E.:....5.. Poo:,a C Cba 9Gct 14.1::1. .•I.I'. -,1� .4:'Y.•1.:I:.il?G• ..I -Jr _.Ir.511.