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Stantec Work Plan for Amended Bioremediation Pilot Study BP Terminal 40T November 10, 2008 facilities, a steel distribution facility, a metal scrap yard, and vacant properties. The City of Stockton sewage treatment plant and ponds are located approximately 3,000 ft south and southwest of the site. Three terminals; BP (formerly ARCO), Tesoro Companies Inc. (Tesoro), and Valero (formerly 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 Company (Time), 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 (KMEP) operates a terminal and pump station and associated subsurface pipelines, which provide fuel to the adjacent terminals. The operators in the Port of Stockton Terminal participate in the Stockton Terminals Technical Committee (STTC). The STTC was formed in 1987 to cooperatively address the nature, extent, and remediation of the petroleum hydrocarbons found in the soil and groundwater at the terminal. The current STTC membership includes BP; Tesoro; and Time. The three fuel distribution terminal lease area is currently occupied by three active distribution terminals operated by: ARCO (now BP), Tesoro, and Valero; two recently closed distribution terminals (Time and Unocal), and a pipeline company (Kinder Morgan). In February 2004, Valero withdrew from the STTC and areas of responsibility were re-assigned by the remaining members of STTC. Separate monitoring and reporting programs (MRPs)were issued by the RWQCB to STTC and Valero in place of MRP No. 5-01-819, which was implemented through the first quarter 2004. CRWQCB MRP No. R5-2004-0823 was issued on May 6, 2004 and first implemented during the second quarter 2004. STTC retains the responsibility of addressing the dissolved plume beneath the northern portion of the site, while Valero is responsible for addressing the dissolved plume beneath the southern portion of the site. PREVIOUS INVESTIGATIONS Soil and groundwater investigations, at and in the area of the site, have been conducted by Woodward-Clyde Consultants, Levine and Fricke, Environmental Strategies Corporation, Kleinfelder, Hydro-Search, Inc., Harding Lawson Associates (HLA), Hart Crowser, EMCON, IT Corporation, Stantec, and URS for various site tenants beginning in 1984. Assessment activities conducted specifically on-site include HLA (1990 and 1991), IT Corporation (IT), and URS. Quarterly groundwater monitoring has been conducted since 1993 on selected monitoring wells at the site as part of the overall monitoring program performed for the STTC. Groundwater samples have been collected from groundwater monitoring well AR/MW-5A, located in the area of highest dissolved petroleum hydrocarbon concentration quarterly since 1993. Benzene concentrations in groundwater samples collected from AR/MW-5A during the quarterly monitoring program have ranged from 24,000 micrograms per liter (Ng/L) in September 1993 to 290 pg/L in May 2006. Benzene was detected at a concentration of 720 pg/L during the fourth quarter 2006 sampling event. 40T Work Plan for Amended Bioremediation Pilot Study.doc 2