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I <br /> SITE INVESTIGATION WORK PLAN <br /> 800 WEST CHURCH STREET <br /> STOCKTON, CALIFORNIA <br /> 1.0 INTRODUCTION <br /> This Site Investigation Work Plan (Work Plan) has been prepared by West Environmental <br /> Services & Technology, Inc. (WEST) to conduct soil and groundwater sampling at 800 West <br /> Church Street in Stockton, California ("the Site;" Figure 1-1). This Work Plan includes a <br /> description of the Site and outlines the tasks for collection of soil and groundwater samples. <br /> 1.1 BACKGROUND <br /> The Site is located at 800 West Church Street in Stockton, California, in area of mixed <br /> residential, commercial and industrial use. The Site is bounded by: Orange and Garfield Street to <br /> the west; McDougall Slough and Interstate 5 to the east; Burlington Northern and Santa Fe <br /> Railroad to the south; and West Church Street to the north (Figure.1-1). Site features include: a <br /> large single-story building complex; and smaller buildings west and south of the complex. <br /> Previous investigations at the Site include soil sampling in September and October 1986 during <br /> the removal of eight underground storage tanks (USTs) at the Site (AEMC, 1986), soil and <br /> groundwater sampling in August 2005 (AGE, 2005), and soil and groundwater sampling in <br /> December 2005 (MACTEC, 2006). In 2010, subslab gas samples collected beneath the building <br /> revealed methane up to 171,000 parts per million by volume (ppm,,). The investigations at the <br /> Site have revealed the presence of toluene in soil and groundwater near the former USTs (AGE, <br /> 2005) and methane in soil gas beneath the building. This Work Plan was prepared to <br /> characterize the Site soil and groundwater conditions. <br /> 1 <br /> 5111 <br />