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Pombo Property <br /> Subsurface Investigation Report <br /> Page: 3 <br /> . vertical limit of the so' <br /> fil contamination. Laboratory soil samples were collected every <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 non-detect for the compounds <br /> analyzed. A hydropunch apparatus was then used to obtain a water sample from below <br /> the 30-foot soil sample. It was driven to 35 feet and opened to 33 feet for a two foot <br /> screened interval. Traces of gasoline and gasoline constituents were present in the <br /> 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 non-detect for the compounds analyzed. The Geoprobe", <br /> hydropunch was driven to 20 feet in depth and opened to 17 feet. Slightly higher <br /> concentration of gasoline and gasoline constituents were present in the laboratory water <br /> sample. No MTBE was detected. <br /> Boring B-1 i 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-11. Laboratory soil samples were collected at 10 and 15 feet in depth <br /> with no apparent contamination observed. Both soil samples were non-detect for the <br /> petroleum compounds analyzed. Groundwater was measured at 11 feet in depth and <br /> sampled at 16 to 20 below grade surface. Low levels of gasoline and BTEX were present <br /> in the groundwater with no MTBE detected. <br /> Geo probe`-Lab orator Sam le Results (Jul 6, 1999 <br /> Sample I.D. TEPH Gas Benzene Toluene E-Benzene Xylenes MTBE <br /> 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 /> -10-10 D ND ND ND ND <br /> B-10-15' ND ND ND ND ND ND ND <br /> ' -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' M ND ND ND ND ND <br />' B-12-15' ND ND ND ND ND ND ND <br /> *conlinned by utcthod 8260 ND=Non Dclect <br /> �� Gasoline&r.Diesel 1Zeponed as nig/Kg 11TEX&MTBE' Repotted asµg/Kg <br />