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�. <br /> • 'Pombo Property <br /> Excavation and Monitoring Well Installation <br /> below grade surface. Both soil sample were non-detect for the compounds <br /> analyzed. The Geoprobe® hydropunch was driven to 20 feet in depth and opened <br /> to 17 feet. Slightly higher concentration of gasoline and gasoline constituents <br /> were present in the laboratory water sample. No MTBE was detected. <br /> Boring B-11 was drilled to the east of B-2 and the former underground fuel tank. <br /> Soil samples were collected from 10, 15, and 21 feet below grade surface. The <br /> ten-foot s ample h ad o bvious p etroleum s taining and o dor. Laboratory analysis <br /> confirmed concentrations of gasoline and BTEX in the ten-foot soil sample. <br /> MTBE was not detected. The 15 and 21- oot samples were found non-detect for <br /> all compounds analyzed. Groundwater was measured and 9 feet in depth and <br /> sampled at 23 to 25 feet below grade surfce. Low levels of gasoline and BTEX <br /> were present in the groundwater with no TBE detected. <br /> Boring B-12 was located about 40 east f boring B-11 because of the apparent <br /> contamination in B-11. Laboratory soil s ples were collected at 10 and 15 feet <br /> in depth with no apparent contamination observed. Both soil samples were non- <br /> detect for the petroleum compounds analyzed. Groundwater was measured at 11 <br /> feet in depth and sampled at 16 to 20 below grade surface. Low levels of gasoline <br /> and BTEX were present in the groundwater with no MTBE detected. <br /> Gev robe®-Laborator fS_o`il Sa le Results (Jul 6, 1499) <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 /> (IB F1 1-91 TEND -51-661— 0200 240 J03800 W JU12000i 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 pg/Kg <br /> Geo r be"D-Labo atory Water S m le Results (July 6, 1999 <br /> Sample I.D. TEPH Gas I Benzene Toluene E-Benzene Xylenes MTBE <br /> B-9-33'H,0 ND 0.2 1.2 2.8 ND 4.8 *ND <br /> B-10-17'H20 ND 6.5 33 49 170 470 *ND <br /> B-11-23'H20 ND 0,8 6.2 5.1 41 19 *ND <br /> B-12-16'H20 ND 0.7 2.1 4.4 22 5.5 *ND <br /> *confirmed by method 8260 ND=Non Detect <br /> Gasoline&Diesel Reported as mg/L BTEX&MTBE Reported asµg11, <br /> On July 20, 1999 three groundwater-monitoring wells were installed at the <br /> perimeter of the site (located north of -10, east of B-12 and southwest, up <br /> gradient, of the former underground fuel t nk). Soil samples were collected at 10 <br /> 4 <br />