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GEOMATRIX <br /> initiated a preliminary soil and groundwater investigation at the property in accordance with the <br /> CTA(Geomatrix, 2002b). ChevronTexaco submitted a work plan (Geomatrix, 2003b), which <br /> was subsequently approved by the RWQCB (2003b). <br /> 3.1 INVESTIGATION OBJECTIVES AND APPROACH <br /> ll In October 2003, Geomatrix conducted a preliminary soil and groundwater investigation at the <br /> _J <br /> Arcos property. The primary objective of the investigation was to identify areas of potential <br /> environmental concerns pertaining to the former pump station. The field investigation was <br /> developed based on results of previous and recent investigations conducted at the Bellini <br /> property. Sampling locations are shown on Figures 2 and 5. Specific objectives and approach <br /> of the preliminary investigation are summarized as follows: <br /> J • Idente;fy areas of potential environmental concerns pertaining to the former pump <br /> J station (Section 3.2). Historical aerial photographs and site plan were reviewed, <br /> and a geophysical survey was conducted to locate pertinent underground features <br /> l that may be associated with the OVP or other pump station operations. <br /> J • Evaluate current property conditions (Section 3.2.3). An aerial and land survey <br /> was performed. A site reconnaissance was conducted to record existing property <br /> conditions. <br /> • Assess areas of potential environmental concerns pertaining to the former pump <br /> _l station (Section 3.3.1). Borings were advanced to a depth of approximately 50 feet <br /> I bgs at locations of former pump station features based on the results of the <br /> geophysical investigation and a review of historical site map and aerial photographs. <br /> -I Selected soil samples were analyzed for petroleum hydrocarbon constituents as well <br /> as metals. <br /> • Assess groundwater quality (Section 3.3.2). Grab groundwater samples were <br /> collected from borings AS13-1, ASB-5 through AS13-8, and ASB-10 through <br /> ASB-12 to assess the presence of petroleum constituents in groundwater. <br /> ( • Assess water quality in the on-site water supply well (Section 3.3.3). Geomatrix <br /> collected a sample from the on-site water supply well to assess the water quality. <br /> The sample was analyzed for petroleum hydrocarbon constituents as well as some <br /> inorganics. <br /> 3.2 FOCUSED SITE ASSESSMENT <br /> A review of the historical site map and aerial photographs, the geophysical survey, and an <br /> evaluation of current property conditions are described in the following three sections. <br /> ; l <br /> 1:1PROJECI\500051501LOOM]1.03.d. 11 <br />