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2012 TIDEWATER STOCKTON WORK PLAN FOR SEPARATE PHASE HYDROCARBON REMOVAL AT THE WATERFRONT TOWERS PARKING LOT ____________________________________________________________________________ 1 1.0 Introduction Stantec Consulting Services Inc. (Stantec), on behalf of ConocoPhillips Company (COP) and Chevron Environmental Management Company (CEMC), has prepared this work plan to address separate phase hydrocarbons (SPH) removal at off-site to the former Tidewater bulk fuel facility, L&M Operable Unit (L&M OU; the “Site”), located near the corner of North Lincoln and West Weber Avenue in Stockton, California (Figure 1). The location of the proposed SPH removal activities are north of the L&M OU in the Waterfront Towers parking lot, which is managed by the Waterfront Office Towers Owners Association (WOTOA). 1.1 Site Description The L&M OU is a 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 UOU; and the Morton-Alco OU (MOU). 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 (Figure 1). This OU includes parts of the Delta View Apartments. Based on historical use of the L&M OU, CEMC and COP (collectively “L&M Group”) have been named as responsible parties. The UOU 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 MOU 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 (SRDA) has agreed to be responsible for assessment and cleanup activities at the UOU and MOU. The area of the Site where the proposed SPH removal remedial system is to be implemented is the area located north of the L&M OU and Weber Avenue, south of the Stockton Deep Water Channel, and west of the Waterfront Towers office buildings. A summary of previous investigations at the Site and site-vicinity is provided in Appendix A. 1.2 Site and Vicinity Background Historical usage of the Stockton area has been primarily industrial and residential since the late 1800s. Parcel 2A was 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 surrounding areas were used to store bulk petroleum fuel products (Treadwell & Rollo [T&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.