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■ <br /> Pombo Ranch Facility April 24,2005 <br /> Remedial Excavation&Source Removal <br /> 1 <br /> five feet from 15 feet below grade surface to 30 feet below grade surface. Water was <br /> ' measured at 12 feet in depth. All four samples were reported as non-detected for the <br /> compounds analyzed. A hydropunch apparatus was then used to obtain a water sample <br /> from below the 30-foot soil sample. It was driven to 35 feet and opened to 33 feet for a <br /> ' two foot screened interval. Traces of gasoline and gasoline constituents were present in <br /> the laboratory sample. No MTBE was detected. <br /> Boring B-10 was drilled in the suspected down gradient direction from boring B-3. It <br /> was located approximately 40 feet north of the former gasoline tank. Soil samples were <br /> collected at 10 and 15 feet in depth. Water was measured at 12 feet below grade surface. <br /> ' Both soil samples were reported as non-detected for the compounds analyzed. The <br /> Geoprobeo hydropunch was driven to 20 feet in depth and opened to 17 feet. Slightly <br /> higher concentration of gasoline and gasoline constituents were present in the laboratory <br /> ' water sample. No MTBE was detected. <br /> Boring B-11 was drilled to the east of B-3 and the former underground fuel tank. Soil <br />' samples were collected from 10, 15, and 21 feet below grade surface. The ten-foot <br /> sample had obvious petroleum staining and odor. Laboratory analysis confirmed <br /> concentrations of gasoline and BTEX in the ten-foot soil sample. MTBE was not <br /> detected. The 15 and 21 foot samples were found non-detect for all compounds analyzed. <br /> Groundwater was measured and 9 feet in depth and sampled at 23 to 25 feet below grade <br /> surface. Low levels of gasoline and BTEX were present in the groundwater with no <br /> MTBE detected. <br /> Boring B-12 was located about 40 east of boring B-11 because of the apparent <br />' contamination in B-1 1. Laboratory soil samples were collected at 10 and 15 feet in depth <br /> with no apparent contamination observed. Both soil samples were reported as non- <br /> detected for the petroleum compounds analyzed. Groundwater was measured at 11 feet <br />' in depth and sampled at 16 to 20 below grade surface. Low levels of gasoline and BTEX <br /> were present in the groundwater with no MTBE detected. <br /> Geo robe®-Laborato Soil Sam le Results (July6, 1999 <br /> Sample I.D. TEPH Gas Benzene Toluene E-Benzene Xylenes MTBE <br /> B-9-15' ND ND ND ND ND ND ND <br />' B-9-20' ND ND ND ND ND ND ND <br /> B-9-25' ND ND ND ND ND ND ND <br /> B-9-30' ND ND ND ND ND ND ND <br /> B-10-10' ND ND ND ND ND ND ND <br /> B-10-15' ND ND ND ND ND ND ND <br /> B-11-10' ND 160 200 740 3800 1200 ND <br /> B-11-15' ND ND ND ND ND ND ND <br /> B-11-21' ND..:-. ND ND. - . . ND ND ND ND <br /> B-12-10' ND ND ND ND ND ND ND <br /> B-12-15' ND ND ND ND ND ND ND <br /> *confirmed by method 8260 ND=Non Detect <br /> Gasoline&Diesel Reported as mg/Kg BTEX&MTBE Reported as jig/Kg <br /> 3 <br /> 1 <br />