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T <br /> DISCUSSION OF LABORATORY RESULTS <br /> Following are tables summarizing test results from both of the <br /> two groups run. The first series from Excavation # 1 , sampled <br /> 1/31/1989, is given in Table A. The second group, from Excava- <br /> tion N 2, sam,iled 7/10/30, is given in Table B. <br /> TABLE A <br /> Sample No. BTEX (mg/kg) TEPH (mg/kg) <br /> Tank I N N.D. .025 N.D. 10 <br /> Tank 1 S N.D. .025 N.D. 10 <br /> # 3 N.D. .025 87 <br /> TABLE B <br /> B N.D. .025 N.D. 10 <br /> E N.D. . 025 490 <br /> N Benzene .84 N.D. 10 <br /> S N.D. .025 N.D. 10 <br /> IV N.D. .025 N.D. 10 <br /> Ali samples from the first excavation showed no contamination at <br /> detectable limits, except for Sample no. 3 in the 2 feet deep <br /> `.3 trench at the edge of the railroad track (Figs. 3 & 9). <br /> No contamination was found in either test at the bottom of the <br /> tank excavation, This indicates that the tank had not leaked <br /> prior to removal . If the tank had leaked, it should have been <br /> revealed in the excavation bottom tests. Also, if product had <br /> leaked and penetrated to the water table, it would have been <br /> brought to the bottom of the excavation by the water which en- <br /> tered the excavation at night . The negative tests at tank bottom <br /> also show that all of the spill that occurred at tank removal <br /> was cleaned uo. <br /> Samples locations for the tests shown on Table B are shown on <br /> Figures 4 and 9 and in Appendix A-10. <br /> The four sidwalls of Excavation no. 2 were sampled about 5 or 6 <br /> feet from the surface. Tf < slight benzine measurement of .84 mg/ <br /> kg at Sample N was taken very near Sample no. 3 from the first <br /> series of tests; that is, at the NE side of the railroad track. <br /> The bottom sample of this excavation also showed no contamin- <br /> ation (Sample C) . A TEPH reading of 490 mg/kg was found at loca- <br /> tion E, also near the railroad tracks. <br /> Please note that the buildings and railroad tracks do not line <br /> up in either a north-south or east-west direction. <br />