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WORK PLAN FOR A SCREENING LEVEL <br /> PHASE II ENVIRONMENTAL ASSESSMENT <br /> PROPOSED FUEL CENTER AT 6425 PACIFIC AVENUE i <br /> STOCKTON, CALIFORNIA <br /> January 21, 2003 <br /> INTRODUCTION <br /> GeoTrans, Inc. (GeoTrans) will be conducting a pre-gas station screening level Phase II <br /> Environmental Assessment (Phase II EA) of a former service station located at 6425 <br /> Pacific Avenue in Stockton, California (the Property). The Property is located in the <br /> southeast corner of the Lincoln shopping center. <br /> SITE BACKGROUND <br /> The Property was formerly occupied by a service station which was closed and recently <br /> renovated.. The renovation activities are currently stopped.ed. The former service station <br /> had a release to the subsurface which was evidently cleaned up and obtained closure <br />` status in November 2001. However, residual levels of petroleum hydrocarbons were <br /> detected in groundwater during the final sampling event prior to closure. <br /> Underground piping from soil vapor extraction (SVE) wells and groundwater extraction <br /> (GWE) wells lead to the Property which houses a vapor/groundwater treatment system. <br /> The off-site SVE and GWE wells are part of an on-going remediation system for volatile <br /> organic compounds (VOCs) related to a release from dry cleaning operations located north <br /> of the Property. In addition, soil piles from previous excavation activities may still be <br /> present at the subject site. <br /> SCOPE OF WORK <br /> The pre-gas station screening level Phase ll EA scope of work will consist of drilling four <br /> soil borings to first encountered groundwater or 30 feet in depth, whichever is shallower, <br /> using a direct-push sampling rig (1.5 inch diameter). Depth to first groundwater is <br /> anticipated within 30 feet of ground surface. One boring will be drilled in the anticipated up- <br /> gradient portion of the gas station pad, two will be completed in the anticipated down- <br /> gradient portion of the pad, and one will be completed in the expected location of the <br /> underground storage tanks. However, based on site conditions (i.e., utilities, etc.)the soil <br /> l <br /> GeoTrans, <br />