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'.� � � : Y �45 �.v � .P �" ?l t;��2"'9112Pa•41 roh id'JY �` A�iiiEdlG�'3i�II. tWL.�mm r '4 r DISCUSS ION 01= LABORATCRY RESULTS Following are tables summarizing test results from both of the two groups run. The first series from Excavation R 1 , sampled 1 /31 /1989, is liven in Table A. The second group, from Excava- tion # 7. , sampled 7/10/30, is given in Table B. TABLE A Sample No. BTEX (mg/kg) TEPH (mg/kg) Tank 1 N N.D. . 025 N.D. 10 lank 1 S N.D. .025 N.D. 10 # 3 N.D. .07.5 87 TABLE B B N.D. .025 N.D. 10 E N.D. .025 490 N Benzene . 84 N.D. 10 S N.D. .025 N.D. 10 W N.D. .025 N.D. I0 All samples from the first excavation showed no contamination at detectable limits, except for Sample no. 3 in the 2 feet deep trench at the edge of the railroad track (Figs . 3 & 9). No contamination was found in either test at the bottom of the tank excavation. This indicates that the tank had not leaked prior to removal . If the tank had leaked, it should have been revealed in the excavation bottom tests. Also, if product had leaked and penetrated to the water table, it would have been brought to the bottom of the excavation by the water which en- tered the excavation at night . The negative tests at tank bottom also show that all of the spill that occurred at tank removal was cleaned up. Samples locations for the tests shown on Table B are shown on Figures 4 and 9 and in Appendix A-10. The four sidwalis of Excavation no. 2 were sampled about 5 or 6 feet from the surface. The slight benzine measurement of . 84 mg/ kg at Sample N was taken very near Sample no. 3 from the first series of tests; that is, at the NE side of the railroad trach. The bottom samDle of this excavation also showed no conta in- ation (Sample C) . A TEPH reading of 490 mg/kg was found at Ic._a- tion E, also near the railroad tracks . Ple. - � note that the buildings and railroad tracks do not line up in either a north-south or east-west direction. `.� ------------- 6