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! Stantec 2010 TIDEWATER STOCKTON WORK PLAN 1.0 Introduction Stantec Consulting Corporation (Stantec), on behalf of ConocoPhillips Company (COP) and Chevron Environmental Management Company (CEMC), has prepared this work plan for performing additional soil and groundwater assessment and pilot testing activities at off-site and adjacent properties to 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 and Figure 2). The locations of the proposed additional soil and groundwater assessment and pilot testing activities are north of the L&M OU in the Waterfront Towers Parking Lot(WFT) and east of the L&M OU at the Unocal Operable Unit(UOU). At the WFT area, additional data points will be advanced to further define vertical and lateral extent of shallow A-Zone and deeper B-Zone dissolved petroleum hydrocarbons and observed separate phase hydrocarbon (SPH) impacts north of the L&M OU. Data will be collected in-situ by installing one continuously cored, direct push boring (DP-22) and approximately eight Cone Penetrometer Testing (CPT) borings (DP-23 through DP-30) in and around the observed SPH (Figure 3). At the UOU area, two groundwater extraction wells (GWE-1 and GWE-2) will be installed in the existing groundwater collection trench installed by the City of Stockton Redevelopment Agency (RDA) during excavation activities that took place on the UOU in late 2008 and early 2009. These extraction wells will be used for aquifer testing using the remediation system that is currently operating on the L&M OU. The purpose of these wells will be to perform aquifer testing to determine information necessary to design appropriate extraction and treatment methods for groundwater collected in the UOU collection trench. The approximate locations of the proposed borings and wells are shown on Figure 3. 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 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 (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 (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 1.1