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From Science to Solutions- <br /> HPP-BTR MP 9204.4 <br /> Vernalis Pump Station <br /> DCN:C20-SAI-Vemalis-01-9955 <br /> July 11,2006 <br /> Mr. M. Scott Mansholt <br /> Chevron Environmental Management Company <br /> 6001 Bollinger Canyon Road <br /> P.O. Box 6012 <br /> San Ramon, California 94583-0712 <br /> Subject: Second Quarter 2006 Groundwater Monitoring and Sampling Report <br /> Vernalis Pump Station <br /> 35500 Welty Road <br /> Vernalis, California <br /> Dear Mr. Mansholt: <br /> At the request of Chevron Environmental Management Company(CEMC), Science Applications <br /> International Corporation(SAIC)has prepared this report for groundwater monitoring and <br /> sampling activities conducted at the Vernalis Pump Station site(the site),Vernalis, California <br /> (Figure 1). The groundwater monitoring and sampling program was initiated at the request of the <br /> Regional Water Quality Control Board—Central Valley Region(RWQCB). This report presents <br /> the results from the second quarter 2006 monitoring and sampling event. Currently, seven <br /> groundwater monitoring wells are being utilized to evaluate hydrologic and water-quality <br /> conditions at the site. Pertinent site features and the locations of monitoring wells are shown on <br /> Figure 2. <br /> BACKGROUND <br /> SITE DESCRIPTION AND USE <br /> The site is located at 35500 Welty Road,Vernalis, San Joaquin and Stanislaus counties, <br /> California(Figure 1). The site consists of two properties: the Bellini property(formerly known as <br /> the Roberts property) and the Arcos property. The Bellini property is located on the northern part <br /> of the site, and the Arcos property is located on the southern part of the site (Figure 2). The <br /> Bellini property is a triangular shaped, 5.73-acre vacant lot. The Arcos property is irregularly <br /> shaped and is currently used as a storage facility for equipment and materials. A residence and an <br /> office are also located on the Arcos property. The site is located in a rural and light-industrial <br /> area and is bordered by Welty Road on the west,Union Pacific Rail Road(UPRR)tracks and <br /> Highway 33 on the northwest, light-industrial facilities on the southeast, and agricultural areas on <br /> the south. Currently,Kinder Morgan Energy Partners,L. P. (KM)maintains a high-pressure <br /> petroleum product pipeline that reportedly transports gasoline,jet fuel, and diesel. The KM <br /> product pipeline is located along and outside of the northeastern site boundary within the UPRR <br /> right of way(ROW). According to an Environmental Site Assessment,the KM product pipeline <br /> was installed approximately 4 to 5 feet below ground surface(bgs)during 1985,was constructed <br /> Science Applications International Corporation <br /> 3800 Watt Avenue I Suite#210/Sacramento,CA 95821 /tel:(916)974-8800/fax:(916)979-3735 1 saic.com <br />