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SECOR 1.0 SITE BACKGROUND The site is located at the Port of Stockton within an industrial area of Stockton, California. The terminal lease area contains fuel distribution terminals and associated pipeline facilities and is bounded by West Washington Street to the north, Navy Drive to the west, and Stork Road to the east (Figures 1A and 1B). Three terminals, British Petroleum (BP) (formerly ARCO), Tesoro, and ST Services are currently operating within the terminal lease area. Two former underground storage tank (UST) facilities,and the area termed as "Port of Stockton" are also located within the terminal lease area. 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 'n 1996. ST Services is currently utilizing the former Time Oil Facility. Additionally, Kinder Morgan Energy Partners (KMEP) operates a terminal and pump station and associated subsurface pipelines, which provide fuel to the adjacent terminals. The Stockton Terminals Technical Committee (STTC) currently comprises BP (a.k.a. Atlantic Richfield Company, a BP affiliated company), Tesoro, and Time Oil. In February 2004, ST Services withdrew from the STTC and areas of responsibility were redesignated by the remaining members of STTC (BP, Tesoro Petroleum Company Inc., 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. CRWQCB-CVR MRP No. R5-2004-0823 was issued on May 6, 2004 (Appendix A) and first implemented during the second quarter 2004. STTC retains the responsibility of addressing the dissolved plume beneath the northern portion of the site (Figure 1A), while ST Services is responsible for addressing the dissolved plume beneath the southern portion of the site (Figure 1A). Table 1 summarizes the wells sampled during the first quarter 2006 in accordance with MRP No. R5-2004-0823. Well construction details for the wells that are currently covered by the STTC MRP are provided in Appendix . Four progressively deeper hydrostratigr ghic units have been defined 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; fifteen of these wells are in the "A" zone, ten wells in the "B" zone, eight wells in the "C" zone, and one well in the "D" zone. • Port of Stockton: A total of 20 wells are monitored; eight of these wells are in the "A" zone, six wells in the "B" zone, three wells in the "C" zone, and three wells in the "D" zone. • Tesoro Terminal: A total of 15 wells are monitored; 11 of these wells are in the "A" zone, one well in the "B" zone, one well in the "C" zone, and two wells in the "D" zone. • • Time Oil Terminal: A total of 12 wells are monitored; eight of these wells are in the "A" zone, two wells in the "B" zone, one well in the "C" zone, and two wells in the "D" zone. STTC 1Q06 Final Report 1 May 1,2006 770T.43673.12.0002