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Stantec <br /> Site History and Previous Investigations <br /> Former ARCO Service Station No. 595 <br /> May 18, 2009 <br /> Mechanical, Inc. of San Leandro, California. Soil samples were collected from the UST, <br /> dispenser island, and piping excavations for analysis. Hydrocarbon staining and a gasoline odor <br /> were noticed in the southwest corner of the UST excavation in the vicinity of soil sample PB-3. <br /> Additional over-excavation was performed in this location. Nine composite samples were also <br /> collected from the approximately 57 cubic yards of over-excavated materials. Soil samples from <br /> the tank excavation (PB-3), line samples (LS-1 and LS-2, dispensers (DI-1 and DI-4), and <br /> stockpiled soil from the vicinity of PB-3 had detections of gasoline range organics (GRO), <br /> ranging up to 2,200 mg/kg. Toluene, ethylbenzene, and xylenes were also detected in the <br /> same samples. TBA was detected in sample DI-3 at a concentration of 0.039 mg/kg. The <br /> removed USTs and product piping were transported to Norcal Waste System's Pacheco Pass <br /> Landfill in Gilroy, California. Excavated soils were disposed of at Forward Landfill in Manteca, <br /> California. <br /> 595 Site History and Previous Investigations.doc 3 <br />