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SOIL AND GROUNDWATER INVESTIGATION REPORT CATELLUS PROPERTY TRACY, SAN JOAQUIN COUNTY, CALIFORNIA 1. INTRODUCTION At the request of Chevron Environmental Management Company(CEMC), Science Applications International Corporation(SAIC)performed this investigation in Tracy,California on the"Catellus Property"site depicted on Figure 1. Because the site is adjacent to former Chevron facilities,CEMC wanted to assess the nature and extent of any affected soil and/or groundwater. Because the pipelines contained crude oil,the following are the constituents of concern: total petroleum hydrocarbons(TPH); benzene,toluene,ethylbenzene,and total xylenes(BTEX); and polynuclear aromatic hydrocarbons (PAHs). The purpose of this investigation is to evaluate the extent of soil and groundwater affected by the constituents of concern and,based on the investigation results,make recommendations regarding future assessment activities and any potential remedial options. SAIC performed this investigation in accordance with the Site Investigation Work Plan(work plan), which was approved on December 21,2005 by the California Regional Water Quality Control Board (RWQCB). It should be noted that,based on recommendations made by SAIC,the RWQCB agreed in a letter dated May 24,2005 that this investigation would exclude analysis for TPH quantified as gasoline (TPHg)and methyl tertiary butyl ether(MTBE). Further,this investigation generally conformed to the RWQCB-approved Technical Approach to Site Evaluation and Decision-Making, Historical Pipeline Portfolio, Central Valley Region(known as the Consistent Technical Approach [CTA]),dated February 2005. The CTA serves to guide decision making during soil and groundwater investigations. 2. BACKGROUND 2.1 LOCATION AND SITE DESCRIPTION The site is located on the northwestern outskirts of Tracy,California. As shown on Figure 1,the site extends along West Byron Road from West Grant Line Road to the northwest to Von Sosten Road to the southeast. Although the Catellus property is approximately 700 acres in size,the site is that part of the property immediately adjacent to Chevron pipelines. The site boundaries are indicated on Figure 1. 2.2 HISTORICAL AND EXISTING PIPELINES Of the four former and existing petroleum pipelines parallel to West Byron Road in the area,the former Standard Oil of California, Wait-Mendota-Richmond Pipeline,or Old Valley Pipeline(OVP),traverses the Catellus property immediately south and west of West Byron Road. The OVP was installed between 1902 and 1904 as a"hot line"(i.e.,the oil was heated to facilitate transmission)and carried San Joaquin Valley crude oil north from the Kern River Oil Fields(in and near Bakersfield)to Standard Oil Company's Richmond Refinery. The pipeline and associated pump stations operated from 1903 until the early to mid 1930s. Pump station equipment and the pipeline were removed south of Tracy and used for other pipeline construction projects in California, including a second parallel line along the OVP right of way(ROW). The pipelines were again used during the early 1940s to primarily transmit Bunker C fuel oil from the Richmond refinery to railroad hubs in Tracy. The pipelines northwest of Tracy may have also been used to transport crude oil to various markets within the Bay Area until the late 1960s. The pipelines northwest of Tracy were reportedly abandoned in 1970. Where the pipelines were not abandoned in place,they were removed and their trenches were likely backfilled with excavated native soil. The former Tidewater Associated Oil Company(TAOC)pipeline ROW traverses the Catellus property immediately north and east of West Byron Road in the Union Pacific Railroad(UPRR)ROW. The 1 From Science to Solutions-