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Monitoring Well Destruction and Soil and Groundwater Investigation Report US Can—Welty Road September 24,2009 the subject of this report, the interpreted narrative WQO for each COPC is the lowest, most conservative published numerical value. Soil analytical results were compared to ESLs and U.S. Environmental Protection Agency(EPA) Regional Screening Levels (RSLs; EPA, 2008a), although these are not prescribed by the CTA. The lowest, most conservative screening levels were chosen for soil and groundwater, and are used in this document only to establish delineation of a COPC in soil or groundwater. 2. BACKGROUND 2.1 LOCATION AND SITE DESCRIPTION The site,which includes the area of investigation related to former HPP activities, is located southwest of the intersection of Highway 33 and S. Welty Road in Vernalis, San Joaquin County, California. It is situated at an approximate elevation of 105 feet above mean sea level and has relatively flat topography that slopes gently downward to the northeast. The site is in a rural area surrounded by agricultural, light-industrial, and residential properties. A Union Pacific Railroad (UPRR)track and right of way(ROW)parallels Highway 33 to the southwest. The site extends from E. Schaefer Road to the northwest, to approximately 500 feet south of the intersection of Highway 33 and S. Welty Road. At its widest point it extends approximately 70 feet northeast and 200 feet southwest of Highway 33. Crop Production Services Inc. (CPS; formerly Western Farm Services) is located at the northwest corner of the Highway 33 and Welty Road intersection. CPS has stored and distributed bulk liquid and dry fertilizers on its facility since 1969. A former Union Oil gas service station was located at the northeast corner of Highway 33 and Welty Road. Until April 2009, the site was occupied by Insulair, Inc. (Insulair), a paper products manufacturer. Prior to Insulair's tenancy, Hunter Container Corporation (Hunter Container; a container manufacturer), and US Can Company(US Can; a can manufacturer) operated on the property. Hunter Container still owns the property. The site and surrounding properties are shown on Figure 2. 2.2 HISTORICAL AND ACTIVE PIPELINES The former OVP and TAOC pipelines transported heated crude oil from Bakersfield to Richmond; the OVP from the early 1900s to the 1960s and the TAOC pipelines from the early 1900s until the 1970s. The former Vernalis Pump Station, an OVP crude-oil pumping station, is located southeast of the intersection of Highway 33 and S.Welty Road. The former OVP and TAOC pipelines were located parallel to, and south of, the UPRR ROW and Highway 33. Kinder Morgan Energy Partners, LP (KM) currently operates a pipeline within the UPRR ROW that runs parallel to the former OVP and TAOC pipelines. The KM pipeline reportedly transports gasoline,jet fuel, and diesel. 2.3 EXISTING AND PLANNED DEVELOPMENT The UPRR ROW, Highway 33, and S. Welty Road are used for transit. Insulair,which was leasing the Hunter Container/US Can property on the south side of Highway 33, discontinued operations in 2009; future development plans for this property are unknown. CPS is currently in operation. There are no other known redevelopment plans for the site or surrounding properties. 2 from Science to Solutions