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1.0 Introduction This Work Plan for Monitoring Well Relocation(Work Plan) presents the proposed scope and schedule for relocating two groundwater monitoring wells (PS/WC-2S and PS/WC-2M) at the NuStar Terminals Operating Partnership L.P. (NuStar) Stockton Facility(the Facility) located in Stockton, California (Figure 1). This Work Plan has been prepared on behalf of NuStar for submittal to the California Regional Water Quality Control Board—Central Valley Region (Water Board). The activities described herein are proposed to allow construction of a new railroad spur running through the area of monitoring wells PS/WC-2S and PS/WC-2M. 2.0 Site Background The following sections include a brief site description and subsurface conditions at the Facility. 2.1 Site Location and Description The Facility is located at 2941 Navy Drive, within the leasehold of the Port of Stockton (the leasehold; Figure 2). Other operators within the leasehold have included ARCO/BP, Time Oil, Tesoro and Santa Fe Pacific Pipeline (SFPP). The leasehold consists of a triangular plot of land that contains several fuel distribution terminals and associated pipeline facilities. The leasehold is bounded to the north by West Washington Street, to the west by Navy Drive, and to the east by Stork Road. The northern part of the leasehold has been used for fuel distribution since the 1940s and was expanded during the 1950s and 1960s. NuStar is one of four active fuel distribution terminals located within the leasehold. The Facility is generally flat and consists of an office area; an operations area, including two truck loading racks and a warehouse; and four areas containing aboveground storage tanks (ASTs). The truck rack, office and operations areas are asphalt-paved; the AST areas are hard-packed soil covered with gravel. Several railroad spurs are located east of the main facility and construction of an additional spur is currently planned. The spurs connect to a main railroad line which runs parallel to Stork Road. A stormwater retention pond is also located in the vicinity of the railroad spurs(Figure 2). 2.2 Geology and Hydrogeology ■ Hydrogeologic conditions of the leasehold were originally presented in the Feasibility Study Report prepared " by SECOR for the Stockton Terminals Technical Committee (STTC; SECOR, 2002). A greater understanding of the subsurface hydrogeology has been obtained as a result of vertical groundwater investigations conducted in 2008 (Ash Creek Associates, Inc. [Ash Creek], 2009a) and 2009 (Ash Creek, 2009b). Work Plan for Monitoring Well Relocation Page 1 NuStar Stockton Terminal-Stockton,California May 10,1011 1014-10