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L <br /> ' Pombo Ranch Facility August 17,2004 <br /> Subsurface Investigation Report& <br /> Second Quarter Groundwater Monitoring <br /> 1 <br /> • Geo robe'-Lab oratory Water Sample Results (July 6, 1999 <br /> ' Sample I.D. TEPH Gas Benzene Toluene E-Benzene Xylenes MTBE <br /> B-9-33'H20 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 /> 13-12-WH20 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 asµg/L <br /> On July 20, 1999 three groundwater-monitoring wells were installed at the <br /> perimeter of the site (located north of B-10, east of 113-12 and southwest, up <br /> ' gradient, of the former underground fuel tank). Soil samples were collected at 10 <br /> feet in depth from each boring during drilling. Laboratory analysis of the three soil <br /> samples were reported as non-detected for gasoline, BTEX, and MTBE. <br /> ' The three wells were monitored depth to water measured and d water samples <br /> collected for laboratory analysis on July 23, 1999. The analytical Iaboratory <br /> ' reported non-detectable concentrations of gasoline, BTEX, and MTBE. <br /> ' Laborato Soil Sample Results J ly 20, 1999 <br /> Sample I.D. TEPH Gas I Benzene Toluene E-Benzene Xylenes MTBE <br /> MW-1-10' NA ND ND ND ND ND ND <br /> MW-2-10' NA ND ND ND ND ND ND <br /> 10 MW-3-10' NA ND ND ND ND ND ND <br /> ND=Non Detect NA=Not Analyzed <br /> Gasoline&Diesel Reported as mg/Kg BTEX&MTBE Reported as pg/Kg <br /> 1 <br /> Lab ratory Well Water Sample Results (July 23, 1999 <br /> ' <br /> Sample I.D. TEPH Gas Benzene Toluene E-Benzene Xylenes MTBE <br /> MW-1 NA ND ND ND ND ND ND <br /> MW-2 NA ND ND ND ND ND ND <br /> ' MW-3 NA ND ND ND ND ND ND <br /> ND=Non Detect NA=Not Analyzed Gasoline&Diesel Reported as mg/L BTEX&MTBE <br /> Reported asµg/L <br /> ' 2.0 SCOPE OF WORK <br /> ' On May 5, 2004 M.J. Kloberdanz & Associates drilled 4 soil borings to various depths to <br /> determine both the lateral and vertical extent of soil & groundwater contamination. <br /> Boring EB-4 was originally intended as a deep well location but strong apparent <br /> contamination was noted at 10 feet in depth at the groundwater interface so only a soil <br /> sample was collected and the boring abandoned. <br />' MW-4 was drilled about 10 linear feet further away from the gasoline source but still <br /> showed signs of high concentrations in the soil. Laboratory analysis of the 10 foot deep <br /> t4 <br />