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amec,9 ' EXCAVATION WORK PLAN 990 Beechnut Avenue Tracy, California 1.0 INTRODUCTION On behalf of Chevron Environmental Management Company (Chevron), AMEC Geomatrix, ' Inc. (AMEC), has prepared this excavation work plan for the 990 Beechnut Avenue property located in Tracy, San Joaquin County, California (the Site, Figure 1). The Site is currently undeveloped and a fence is maintained around the property boundary to prevent trespassing. Results from characterization activities and a screening-level risk assessment(SLRA) indicate that chemicals in soil within a localized area of the Site exceed screening levels for commercial/industrial use. The objective of the proposed remediation is to address soil in this localized area so that the Site will be suitable for future commercial/industrial use. To achieve this objective, soil excavation and off-site disposal is recommended for addressing the ' localized area of impacted soil. The purpose of this work plan is to present the objectives, rationale, methods, procedures, and activities for the implementation of the planned remedial activities. The following sections provide a general description of the Site background, a discussion of 1 the geologic and hydrogeologic setting, a summary of Site investigation activities, the results of the SLRA, and a description of the proposed remediation and assessment activities, public participation activities, and schedule. ' 2.0 SITE BACKGROUND ' The Site is an approximately 3-acre vacant undeveloped property located in a predominantly mixed residential and commercial area in the City of Tracy, California (Figure 2). The Site is bounded by Beechnut Avenue to the north, Forest Hills Drive to the east, residential homes to the south, and greenbelts and residential housing to the west. An apartment complex, located on the southwest corner of the intersection of Forest Hills Drive and Beechnut Avenue, ' borders the northeast corner of the Site. The Former Tidewater Associated Oil Company (TAOC) Tracy Pump Station Property (800 Beechnut Avenue) is situated directly east of the Site across Forest Hills Drive. The residential subdivision located to the west of the Site ' (hereafter referred to as the Alden Park Property) includes single and multi-family residences, a city park (Alden Park), a greenbelt between Palm Circle and Sequoia Boulevard, and a separate greenbelt area immediately adjacent to the western and southwestern site boundary (Figure 2). The Site topography is relatively flat, with the exception of a "fill mound", a raised area in the central portion of the Site (Figure 3). Most of the Site lies at an elevation between ' AMEC Geomatrix, Inc. I:\Doc_safe\6000s\6628.001\3000 REPORTS\Excavation Work Plan-8.12.08\1 Text,cover and slips\Text.doc