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1 <br /> Report of Investigation <br /> Former Underground Storage Tanks <br /> 3145 South El Dorado Street Stockton California <br /> Sierra-Pacific Project No 96-624 01 <br /> B-2 at concentrations of 10,100 and 15,000 ppm, respectively TOG was not detected in the sample <br />' from B-1 or the sample from B-4 <br />' Table 1. Soil Sample Results <br />' Sample Total <br /> Number Benzene Toluene Ethylbenzene Xylenes MTBE TPH-g TOG <br />' B-1-15 ' ND ND ND ND ND ND(1 0) ND(50) <br /> B-2-15 23 ND ND 03 13 ND 427(50) 10,100 (50) <br />' B-2-30 4 ND 005 007 029 ND 43 (10) 15,000 (50) <br /> B-3-101 ND 05 12 66 ND 855(50) NA <br /> B-3-204 006 023 009 062 0 061ND1 54 (10) NA <br /> B-3-30 4 006 021 017 076 0 09/ND5 126(10) NA <br /> B-4-101 ND ND ND ND ND ND(1 0) NA <br /> B-4-20 ' ND ND ND ND ND ND(1 0) ND(50) <br />' B-4-30 t ND ND ND ND ND ND (1 0) NA 11 <br /> Notes <br /> I Detection limits for analyses on this sample were 0 005 ppm, except where noted in parentheses <br /> 2 B-2 was later converted to ground water monitoring well MW-2 <br /> 3 Detection limits for analyses on this sample were 0 3 ppm, except where noted in parentheses <br /> 4 Detection limits for analyses on this sample were 0 05 ppm, except where noted in parentheses <br /> 5 The first result shown (before the slash) is by EPA method 8020, having a detection limit of 0 05 <br />' ppm The second result is by EPA method 8260, having a laboratory detection limit of 0 005 ppm. <br /> ND =Not detected at or above the indicated laboratory detection limits NA=Not Analyzed <br /> 4 4_Ground Water Sample Analysis Results <br />' Grab samples from open soil borings B-3 and B-4 were collected on November 13, 1996, as described <br /> above A sample was also collected from the ground-water monitoring well constructed in B-2 (MW-2), <br /> after well development and purging in accordance with the Tri Regional Board Staff Recommendations <br /> for Preliminary Investigation and Evaluation of Underground Tank Sites, dated 10 August, 1990, <br />' Sierra-Pacific Groundwater Consultants, Inc 10 <br />