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1 i • <br /> 1 <br /> �I <br /> ' excavation. One sample was collected from the native soil at a <br /> depth of approximately 1 to 2 feet below each end of the UST or the <br /> ' equivalent of approximately 11 feet below the existing ground <br /> surface; and two soil samples were collected from the central <br /> portion of the UST excavation at a depth of approximately 11 feet <br /> ' bgs . One grab groundwater sample was also collected from the <br /> groundwater that was encountered at the bottom of the UST <br /> excavation Additionally, two 3011 samples were collected beneath <br /> the tank piping at a depth of approximately 3 feet bgs and two <br /> composite samples were collected from the stockpiled material . <br /> ' Soil samples collected beneath the UST and stockpiled material <br /> -indicated low to non-detectable concentrations of total petroleum <br /> hydrocarbons (TPH) as gasoline (TPHg) , benzene, toluene, <br /> ' ethylbenzene, and xylenes (BTEX) , oxygenates, and lead, and non- <br /> detectable to elevated concentrations of TPH as diesel (TPHd) . The <br /> grab groundwater sample collected from the UST excavation contained <br /> 1 non-detectable concentrations of TPHg, BTEX, oxygenates, and lead, <br /> and an elevated concentration of TPHd The soil samples collected <br /> beneath the tank piping contained non-detectable concentrations of <br /> TPHg, TPHd, BTEX, oxygenates, and lead. The approximately 687 tons <br /> of stockpiled petroleum-affected material containing the elevated <br /> concentrations of TPHd were disposed at Forward Landfill (Forward) <br /> of Manteca, California. <br /> 4 . 0 PRELIMINARY SITE INVESTIGATION <br /> ' Prior to drilling activities, the boring locations were marked and <br /> cleared of underground utilities Underground Services Alert and <br /> 1 Cruz Brothers of Milpitas were contacted to assist in utility <br /> clearance activities The drilling activities were conducted at <br /> the Site by Woodward Drilling Company, Inc of Rio Vista, <br /> 1 California on March 8 , 2005 and observed and documented by ICES . <br /> 1 4 1 Sox1 and Groundwater Sampling <br /> Soil samples were collected from three borings (SB-1, SB-3, and <br /> SB-4 ) Boring SB-1 was located within the former UST pit, boring <br /> SB-3 was located approximately 15 west of boring SB-1, and boring <br /> SB-4 was located approximately 15 east of boring SB-1, <br /> ' respectively. The approximate boring locations are shown in Figure <br /> 2 <br /> 2 <br /> 1 <br />