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California egional Water Quality Co_ of Board ' i Central Valley Region Linda S.Adams Arnold Secretaryfor Robert Schneider,Chair Schwarzenegger Environmental Fresno Branch Office Goivrnor Protection 1685 E Street,Fresno,California 93706 (559)445-5 1 16•Fax(559)445-5910 litip://www,waterboards.ca.gov/centraIva]ley TO: Shelton R. Gray FROM: C. Dean Hubbard Senior Engineering Geologist Engineer i Geologist DATE: 6 November 2006 SIGNATURE: SUBJECT: REVIEW OF SOIL AND GROUNDWATER INVESTIGATION, CATELLUS PROPERTY, TRACY, SAN JOAQUIN COUNTY I have reviewed the Soil and Groundwater Investigation report for the Catellus site located northwest of Tracy. The 28 September 2006 report was prepared for Chevron by their consultant, SAIC. The Catellus property is located along the former Old Valley Pipeline (OVP) right-of-way (ROW) adjacent to W. Byron Road, between W. Grant Line Road and Van Sosten Road, immediately northwest of Tracy. A reference Figure provided by SAIC is attached. Background The OVP, located west of W. Byron Road, and the former Tidewater Associated Oil Company (TAOC) pipeline located east of W. Byron Road, previously transported crude oil and/or Bunker C fuel oil between Kern County oil fields and refineries in the Richmond area until the 1960's. The former TAOC pipeline was located within the Union Pacific Railroad (UPRR) tracks ROW, also the east side of W. Byron Road. In addition to the TAOC line, two active refined product pipelines (Bay Area Products Line and the Kinder Morgan Line) are within the UPRR ROW. The former pipelines northwest of Tracy were reportedly abandoned by the 1970's. The Catellus property is undeveloped and it is located within the City of Tracy General Plan - 11sphere of influence" and is designated Urban Reserve 4. According to the General Plan, the immediate area adjoining W. Byron Road will be developed for industrial, commercial, and office uses near Interstate 205, and residential uses located further from the highway. In latter 2005, an excavation contractor encountered petroleum hydrocarbon-impacted soil during utility installation activities at the intersection of W. Grant Line and W. Byron Roads. Elevated total petroleum hydrocarbon (TPH) concentrations were reported in soil and groundwater. This area (referred to as the SBC Dig) was considered within the scope of the Catellus property characterization activities currently in progress. The Catellus investigation is part of Chevron's "forward" environmental assessment of properties located along the former OVP or TAOC lines and was not prompted by the findings of the SBC Dig site. The SBC Dig site is located at the southeast end of the Catellus project. Other than the SBC Dig, environmental assessments have not been conducted for the property, which extends approximately 4,000-feet northwest-southeast and addresses a strip of property up to 700-feet wide and encompasses the east and west sides of W. Byron Road. California Environmental Protection Agency �a Recycled Paper