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1W 2101 Webster Street 12th Floor Oakland, CA 94612 15103 663-4100 • FAX [51 O] 663-4141 GEOMATAIX April 3, 2002 Project 5011.001 Mr. Robert Mihalovich Chevron Environmental Management Company Post Office Box 6012 San Ramon, California 94583 Subject: Soil and Groundwater Sampling Work Plan Roberts Property (Former Vernalis Pump Station) 35500 Welty Road Vernalis, California Dear Mr. Mihalovich: Geomatrix Consultants, Inc. (Geomatrix)has prepared this Soil and Groundwater Sampling Work Plan on behalf of Chevron Environmental Management Company(ChevronTexaco) for the Roberts Property (Former Vernalis Pump Station) located in Vernalis, California(the site; Fig- ure 1). The Roberts property is located within the northern portion of the former Vernalis Pump Station. Previous investigations performed at the site indicate the presence of petroleum hydro- carbons in the subsurface at the site. The petroleum hydrocarbons present in the subsurface may be residual crude oil associated with ChevronTexaco's historical Old Valley Pipeline (OVP). This work plan was prepared based on a review of the existing site data with respect to the site assessment protocols outlined in ChevronTexaco's October 5, 2001 Draft Revised Constant Tech- nical Approach, Old Valley Pipeline Sites, Central Valley Region, California (2001 CTA) and current requirements/requests of the California Regional Water Quality Control Board, Central Valley Region (RWQCB). This work plan provides the scope of work for additional investigative activities, which includes advancing 5 soil borings, collecting one grab groundwater sample, and collecting groundwater samples from existing site wells. This work plan also provides a brief description of the site setting along with a summary of the existing data. SITE SETTING The triangular shaped, 5.73-acre site is located at 35500 Welty Road and is bounded by State Highway 33 and the Union Pacific Railroad right-of-way to the northeast (Figure 2). From 1902 to 1935, the site comprised the northern portion of the Vernalis crude oil pump station. The pump station was part of the OVP system, which transported San Joaquin Valley crude oil from oil fields in Bakersfield to the Chevron Refinery in Richmond, California. As shown on Figure 2, former pump station facilities (e.g.,pipeline, pump house, heater house, and boiler house), of which the pipeline and a portion of the former pump house are located on the site. The pipeline entered the pump station from the east and exited to the north across the central portion of the site. A Kinder Morgan Energy Partners, L.P., petroleum product pipeline that reportedly transports gasoline,jet fuel, and diesel is located adjacent to the northern property boundary within the Union Pacific right-of-way. Several farms are located to the west across Welty Road and east of State Highway 33 from the site. Light industrial properties and farms are located to the south of the site. Geomatrix Consultants, Inc. Engineers. Geologists. and Env!ronnnentsl Scientists