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From Science to Solutions- HPP—BTR MP#204.1 US Can-Welty Road Reports DCN:C20-SAI-Welty-Road/US-Can-01-12043 July 26,2007 Mr. M. Scott Mansholt Chevron Environmental Management Company 6001 Bollinger Canyon Road P.O. Box 6012 San Ramon, California 94583-0712 Subject: Second Quarter 2007 Groundwater Monitoring and Sampling Report US Can—Welty Road 35275 Welty Road Vernalis, California Dear Mr. Mansholt: At the request of Chevron Environmental Management Company(CEMC), Science Applications International Corporation(SAIC)prepared this report for groundwater monitoring and sampling activities conducted at the US Can—Welty Road site(the site)in Vernalis, California(Figure 1). The groundwater monitoring and sampling program for the site was initiated at the request of the California Regional Water Quality Control Board—Central Valley Region(RWQCB)in a letter to CEMC dated December 4,2003. The purpose of the program is to characterize the extent of impacts to groundwater from the former Old Valley Pipeline (OVP) system. This report presents the results from the second quarter 2007 monitoring and sampling event. Currently, six groundwater monitoring wells are being used to evaluate hydrologic and water-quality conditions at the site. Pertinent site features and the locations of monitoring wells are shown on Figure 2. BACKGROUND SITE DESCRIPTION AND USE The site is located at 35275 Welty Road,Vernalis, San Joaquin County, California and is currently occupied by a paper insulation manufacturing company. The site was formerly owned by a container manufacturer,Hunter Container Company, and a can manufacturer,US Can Company. The site is located in a rural and light-industrial area and is bordered by Welty Road on the east,Highway 33 on the north, and agricultural fields south and west of the site. The site location is presented on Figure 1. From the early 1900s to the 1960s, Standard Oil(predecessor to Chevron)operated the former OVP, which transported heated heavy petroleum(crude oil)from Bakersfield to Richmond, California. The OVP was located along the northeastern side of the site and parallel to the existing Union Pacific Rail Road(UPRR)tracks and Highway 33. From the early 1900s until it was decommissioned in the 1970s, the former Tidewater Associated Oil Company(TAOC)pipeline was also present between the site and Highway 33. The TAOC pipeline was used to transport heated crude oil from the Central Valley to the San Francisco Bay Area. Currently,Kinder Morgan Energy Partners,L. P., operates a pipeline that transports gasoline,jet fuel,and diesel, and is located between the site and Highway 33. Western Farm Service(WFS)is located directly Science Applications International Corporation 3800 Watt Avenue I Suite#210/Sacramento,CA 95821 /tel: (916)974-8800/fax:(916)979-3735 1 saic.com