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i • ACT-P-97-1006 Ranch Market - Phase II page 3 1 1( R D I This report presents the results of our recent soil investigation at the Ranch Market at 23569 Santa Fe Road in Riverbank, California The work described herein was conducted in accordance with our work plan dated November 1997 Work consisted of the dialling and sampling of one boring to confirm the vertical extent of soil and groundwater contamination at the subject site 2 SITE LUSIORY The site is located at the southeastern intersection of Santa Fe Road and Henry Road in • Riverbank, California(Figure 1). For surface improvements, there is a one single story brick building The remainder of the site is covered with asphalt Previously, the site was operated as commercial gasoline refueling station Currently the site is being used as a min, market (Figure 2). On May 20, 1991, Semco removed three underground storage tanks, two one thousand gallon tanks and on five hundred gallon tank These tanks were located in the front ofthe budding The analytical results from the laboratory indicated the presence of petroleum hydrocarbon in the soil at the bottom of the tanks The surface of the area where the tanks were located is covered with concrete four to six inches thick 3 RECENT Fl(ELD CTIVITIES On January 23, 1998, one soil boring (B 1) was drilled by Pierson drilling The boring was drilled with an eight inch hollow stern auger to a depth of approximately 30 feet, as shown in Figure 3. The borehole was drilled to the capillary fringe and undisturbed soil samples were collected at five foot intervals(except at the 15 feet depth, where soil samples were not recovered because hard rock was encountered) Then a groundwater sample was collected from below the capillary fringe. The soil and water samples were sent to the Sherwood Laboratory in Hilmar, California for testing