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I INTRODUCTION <br />A geophysical survey was conducted at the California Army National Guard facility in Stockton, <br />California on May 23-24, 2006. The purpose of the investigation was to map the vertical extent <br />of a former waste disposal area. Geophysical methods used during this investigation included <br />the 2D electrical resistivity imaging, seismic refraction and multi-channel analysis of surface <br />waves (MASW) techniques. Two electrical resistivity and three seismic refraction profiles were <br />collected across the disposal area as shown in Figure 1. MASW soundings were collected at <br />three locations within the limits of the disposal area; two MASW soundings were collected <br />outside the disposal area. <br />The site consisted of a dirt, gravel, and clayey soil lot bound by fences on all sides Surficial <br />features that affected the geophysical data included electrical utilities (between lightposts) and <br />some areas of partially-buried non-reinforced concrete pavement. <br />The following sections include a discussion of equipment and field procedures, data processing, <br />and results of the geophysical survey. Geophysical techniques used during this investigation, <br />their field procedures and data processing are discussed in Section 2 and 3. A summary <br />interpretation of the geophysical data is presented in Section 4. References are listed in Section <br />5 and our professional certification is presented in Section 6. <br />6243 Versar 1 July 6, 2006