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• S E C O R - ---- 1.0 INTRODUCTION On behalf of Chevron Environmental Management Company (CEMC) and ConocoPhillips Company (COP), SECOR International, Incorporated (SECOR), presents this work plan for performing additional deeper zone groundwater assessment at the former Tidewater bulk fuel facility, L&M Operable Unit (L&M OU; Site), located near the corner of North Lincoln and West Weber Avenue in Stockton, California (Figure 1). The purpose of the proposed additional groundwater assessment activities are to provide additional data points for further delineation the vertical and lateral extent of dissolved petroleum hydrocarbons and observed separate phase hydrocarbon (SPH) plumes at and near the L&M OU. 1.1 Site Description The "Site' is the L&M OU portion of a larger parcel of land that the City of Stockton refers to as Parcel 2A. During a December 2, 2002 meeting with the California Regional Water Quality Control Board (CRWQCB), Parcel 2A was divided into three Operable Units (OUs): the L&M OU; the Unocal OU; and the Morton OU. The L&M OU was established to direct investigations in the area south of West Weber, west of the midline of the former Harrison Street, east of North Edison, and north of former Main Street (Figures 1 and 2). This OU includes parts of the Delta View Apartments. Based on historical use of the L&M OU Site, CEMC and COP have been named as responsible parties. The Unocal OU was established to direct investigations from Weber Street south to the former Main Street and from the midline of the former Harrison Street east to Lincoln Street. The Morton OU was established to direct investigations from the middle of the former Main Street down to the southern boundary of Parcel 2A and from the midline of the former Harrison Street east to Lincoln Street. The City of Stockton owns the area known as Parcel 2A. Following various legal agreements, the City of Stockton Redevelopment Agency (RDA) is responsible for assessment and cleanup activities at the Unocal and Morton OUs. The Site is bounded by the Waterfront Towers Parking lot and the Stockton Deep Water Channel to the north, the Delta View Apartments to the west and south, and the Unocal OU and North Lincoln Street to the east. 1.2 Site and Vicinity Background Historical usage of the Stockton area has been primarily industrial and residential since the late 1800s. The Site and Site vicinity were primarily marshland until 1895, when the area was filled, apparently to create more usable land for industrial use. By 1917, a network of railroad tracks had been laid within the vicinity of the Site. At that time, portions of the Site and Site vicinity were used to store bulk petroleum fuel products (Treadwell & Rollo [f&R], Volume II Site Characterization Report, South Shore Parcels, Stockton, California, December 13, 1999). In 1917 Associated Oil Company occupied a portion of the L&M OU, Standard Oil Company occupied a smaller portion of the L&M OU, and Union Oil Company was situated to the east of the L&M OU. The Site was occupied by lumber storage yards, a windmill and tank factory, and warehouses for grain storage (Environmental Resolutions, Inc. [ERI], Off-Site Source Investigation, The Stockton Group Property, West Weber Avenue and North Lincoln Street, Stockton, California, May 17, 2000). Southeast of the Site was once occupied by an additional lumber company. Additional Deep Zone Assessment Work Plan.final.doc Tidewater Stockton March 14,2008 I 1