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Ranter Site History and Previous Investigations BP Stockton Terminal No. 40T June 17, 2009 STTC Summary The Stockton Terminals Technical Committee (STTC) is currently comprised of BP (a.k.a. Atlantic Richfield Company, a BP-Affiliated Company), Tesoro, and TOC Holdings Co. (formerly Time Oil). Former operators within the terminal lease area include Time Oil, Unocal, and Stockton Petroleum. Unocal ceased operations in 1992, Stockton Petroleum in 1992 or 1993, and Time Oil in 1996. ST Services is currently utilizing the former Time Oil Facility. Additionally, Kinder Morgan Energy Partners operates a terminal, pump station, and associated subsurface pipelines, which provide fuel to the adjacent terminals. In February 2004, ST Services withdrew from the STTC and areas of responsibility were re- designated by the remaining members of STTC (BP, Tesoro, and Time Oil Company) and ST Services. Separate monitoring and reporting programs (MRPs) were issued by the California Regional Water Quality Control Board (CRWQCB) to STTC and ST Services in place of MRP No. 5-01-819, which was implemented through the first quarter 2004. The CRWQCB MRP No. R5-2004-0823 was issued to STTC on May 6, 2004 and first implemented during the second quarter 2004. STTC retains the responsibility of addressing the dissolved plume beneath the northern terminal lease area, while ST Services is responsible for addressing the dissolved plume beneath the southern terminal lease area. Hydrostratigraphy and Monitoring Well Network Four progressively deeper hydrostratigraphic units have been identified at the site and are referred to as the "A" zone, "B" zone, "C" zone, and "D" zone, respectively. As required by MRP No. R5-2004-0823, the following wells are monitored and sampled during various quarters at the following facilities: • BP Terminal: A total of 34 wells are monitored; 15 of these wells were installed within the "A" zone, ten wells were installed within the "B" zone, eight wells were installed within the "C" zone, and one well was installed within the "D" zone. • Port of Stockton: A total of 25 wells are monitored; 11 of these wells were installed within the "A" zone, six wells were installed within the "B" zone, four wells were installed within the "C" zone, and four wells were installed in the "D" zone. • Tesoro Terminal: A total of 16 wells are monitored; 11 of these wells were installed within the "A" zone, one well was installed within the "B" zone, one well was installed within the"C" zone, and three wells were installed within the "D" zone. • Former Time Oil Terminal: A total of 12 wells are monitored; eight of these wells were installed within the "A" zone, two wells were installed within the "B" zone, one well was installed within the "C" zone, and one well was installed within the "D" zone. Remediation Two ozone sparge (OS) systems (termed East System and West System) operate at the Site. The East System, which is located east of the BP and Time Oil facilities, began operation on September 21, 2004. This system is comprised of a total of 26 "A" zone OS wells (OS-32 through OS-57) and 8 "B" zone OS wells (OS-9B through OS-16B) that are connected to a 5- pounds per day ozone generator, a compressor rated to deliver 15 standard cubic feet per minute (scfm) of ozone at 40 pounds per square inch (psi), pneumatically actuated ball valves, 0040T Site History and Previous Investigations.doc 1