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1.0 Introduction This document presents the Revised Cleanup Plan for the NuStar Terminals Operations Partnership L.P. (NuStar) Stockton Facility (the Facility) located at 2941 Navy Drive in Stockton, California (Figure 1). A Cleanup Plan (Ash Creek, 2006a) was submitted to the Central Valley Regional Water Quality Control Board (Water Board) on January 5, 2006. In response, the Water Board requested additional investigation of groundwater to better assess remedial options. The groundwater investigations were completed between 2006 and 2011. A conceptual site model was developed for the Facility and submitted to the Water Board as part of the Investigation Summary Report(Ash Creek 2012a) on January 6, 2012. In a letter dated March 19, 2012, the Water Board requested a revised cleanup plan incorporating the results of the additional investigation and using the conceptual site model to develop recommendations for addressing the dissolved petroleum hydrocarbons at the Facility. This Revised Cleanup Plan was prepared by Ash Creek Associates, a division of Apex Companies LLC (Ash Creek) in response to the Water Board's March 19, 2012 request. The plan was developed using the State Water Resources Control Board Low-Threat Underground Storage Tank(UST) Case Closure Policy(Low-Threat Policy)dated August 17, 2012. The Facility is within the Port of Stockton terminal leasehold ("the leasehold"). Other operators within the leasehold have included ARCO/BP, Time Oil, Tesoro, and Santa Fe Pacific Pipeline (SFPP). ARCO/BP, Time Oil, and Tesoro are a part of the Stockton Terminals Technical Committee (STTC) and are participating in joint groundwater monitoring, investigation, and remedial activities for the northern portion of the terminal leasehold. NuStar was a part of the STTC from its inception in 1992 until 2004, and participated in the terminal leasehold investigations, pilot studies for remedial actions, and groundwater monitoring. In February 2004, NuStar determined that, because the petroleum impacts associated with the NuStar Facility are limited to the southern portion of the leasehold, it would be more efficient to conduct groundwater monitoring and remedial actions outside of the STTC. 2.0 Site Background The following sections present background information for the Facility. 2.1 Site Location and Description The Facility is located at 2941 Navy Drive in Stockton, California, within the leasehold (Figure 2). The leasehold consists of a triangular plot of land that contains several fuel distribution terminals and associated pipeline facilities. Other operators within the leasehold have included ARCO/BP, Time Oil, Tesoro, Buckeye, and SFPP. 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. Revised Cleanup Plan Page 1 Jk NuStar Stockton Terminal-Stockton,California November 7,2012 1014-12