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r� <br /> RESULTS OF SAMPLE ANALYSIS <br /> The top two samples taken in the backfill portion of the excavation were below the detection levels <br /> on all elements of the analysis(BHI @ 5'and BHI @ 10'). The next five soil samples indicated very <br /> low amounts of the BTEX compounds(BHI @ 15', BH1 @ 20', BHI @ 25', BHI @ 30' and BHI <br /> @ 35'). Al of the four remaining samples were below the detection levels. The stockpile composite <br /> sample was non-detect for all elements tested. <br /> CONCLUSIONS i <br /> All of the soil samples were analyzed as non-detect or very low in the BTEX components of gasoline. <br /> The chemical analysis indicated that this gasoline spill is very old. Under normal biotic and abiotic <br /> reactions the Xylene fractions are one of the slowest to reach full biodegradation. With the source <br /> of the contamination removed, the remaining BTEX fractions on this site will continue biodegradation <br /> without any movement through the soil. <br /> The very low concentrations of the BTEX components in the soil under the tank excavation present <br /> no risk to the water table below this site. The water table is protected by a minium of fifteen feet of <br /> low permeability soil. The chance that the water table would raise into the contaminated portion <br /> under the removed tank excavation is very remote. <br /> Please address any questions, corrections, or additions to Ery Rifenburg, Foothill Engineering, phone <br /> 2091368-9381 <br /> Respectfully submitted, <br /> FooEngi ng � ,�RFE��r`p�F� <br /> No. 197,62 <br /> Ery R.i enburg E P. <br /> CML <br /> cc: Dr. Delph OPCAttW�'� <br /> I <br /> h <br /> i <br />