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ENVIRONMENTAL INVESTIGATION REPORT <br /> UNOCAL SERVICE STATION NO. 5886 <br /> 2701 WEST MARCH LANE <br /> ' STOCKTON, CALIFORNIA <br /> DELTA PROJECT NO. D095-066 <br /> 1.0 INTRODUCTION <br /> ' Delta Environmental Consultants, Inc (Delta), has been authorized by Unocal Corporation (Unocal) to <br /> perform environmental assessment activities at Unocal Service Station No 5886, located at 2701 West <br /> ' March Lane, Stockton, California(Figure 1, Site Location Map) The activities performed included the <br /> collection of soil samples following the removal of the station dispensers, associated product lines, and <br /> ' the station's canopy footings, the advancement of 21 Geoprobe points, the collection of soil and ground <br /> water samples, the sampling, profiling and disposal of soil generated from the site, the sampling of soil <br /> ' in the area of the new canopy footings, and the removal of three 12,000 gallon underground storage tanks <br /> (USTs), including soil and ground water sampling and the disposal of ballast water used in the <br /> 12,000 gallon and the 15,000 gallon replacement USTs The field work previously described was <br /> proposed in Delta's Work Plan for Corrective Action, dated August 18, 1995, Addendum to Work Plan <br /> for Corrective Action, dated August 23, 1995, and Work Plan for Underground Storage Tank Removal, <br /> dated October 16, 1995 <br /> ' 2 0 PROJECT BACKGROUND <br /> ' The site is located immediately west of Interstate 5 on the northwest corner of March Lane and the March <br /> Lane off ramp in Stockton, California The Calaveras River is located approximately 2,500 feet south <br /> ' of the site and Fourteen Mile Slough is located approximately one mile north of the site as shown in <br /> Figure 1, Site Location Map The site is at an elevation of approximately two feet above mean sea level <br /> The land was originally purchased by Unocal in 1967, at which time the site was barren land In 1982, <br /> Unocal constructed the service station and installed three-12,000 gallon USTs The tanks held unleaded <br /> plus gasoline, high performance gasoline, and diesel fuel The fuel was distributed from <br /> eight (8) dispensers The location of the former USTs and the dispenser islands are presented in <br /> ' Figure 2, Former Facility Layout <br /> RPT160 S1S <br /> 1 r <br />