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S.!.., <br /> ' - 18 Noveinlier 2002 <br /> AGE-NC Project No: 98-0504 <br /> _t page-3'o_f 5, : <br /> 1.. <br /> 1 <br /> 1.6 EQUIPMENT DECONTAMINATION <br /> All probing 'rods used were cleaned-prior to advancement in each probe boring location. The <br /> sampling equipment was washed in an'Alconox solution_ and- rinsed with-water, prior to each <br /> sampling•run to avoid'cross-contamination. <br /> 2.6: BOREHOLE ABANDONMENT. <br /> At'the conclusion of soil boring activities, the borings were permanently sealed to prevent vertical <br /> migration of contaminants. Under EHD oversight,,the,borehole was_ backfilled with cement slurry <br /> ' from the total depth to surface grade. ' <br /> 3.4. FINDINGS <br /> Soil.descriptions and ground water elevation and flow direction were determined from field data. <br /> Petroleum Hydrocarbon impacts to soil and ground water was inferred from laboratory analysis of . <br /> . the soil and'ground water samples. <br /> 3.1. SOIL DESCRIPTIONS <br /> The soil encountered in all three borings at discrete depths between 10 and 40 feet bsg consisted of <br /> gray and tan brown,moist to wet silt. Ground water was encountered at approximately 40 to'45 feet <br /> bsg. Soil boring logs are included in Appendix A. ; <br /> -3.2. . ANALYTICAL RESULTS OF SOIL SAMPLES <br /> ' _ TPH-g and BTEX compounds were not detected in the soil samples analyzed.MTBE was detected <br /> by EPA method 8260B in three soil samples: soitsample B3 at 30 feet bsg(B3-30)at a concentration ; <br /> of 0.016µg/kg,and soil samples B4-20 and B4-30 at concentrations of 0.008 µg/kg and 0.006µglkg; <br /> 'respectively. <br /> No other target analytes were detected in the samples analyzed. Soil sample analytical results-are <br /> summarized in Table 1.The laboratory report(CTEL Lab ID 0208007),quality assurance and quality . <br /> ' control (QA/QC) and chain-of-custody are.included in-Appendix B. <br /> 1 <br /> 1i Advanced GeoEnvironmental,Inc- , <br />