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29 March 2002 <br /> AGE-NC Project No. 99-0637: ; <br /> Page 5 of 6 <br /> 3:3. ANALYTICAL RESULTS OF SOIL SAMPLES: <br /> A total of.7 soil sampleswere analyzed for TPH=g,TPH-d,BTEX,MTBE and seven fuel additives. <br /> MTBE was detected by EPA Method 8260 in the soil sample.collected from MW5 at 20 feet.at a ; <br /> concentration of 0.51 mg/kg.No other analytes were.detected at or above-laboratory reporting.limits i <br /> in the soil ' samples analyzed. The ,approximate .extent of impacted soil is depicted on <br /> Figures 4, 5.arid 6. <br /> r' Analytical results of soil samplesare summarized on.Table 2.The laboratory reports(MAI Lab I.D. <br /> No 89157 through.89162 and 89928), quality assurance and quality control (QA/QC) report and <br /> chain-of-custody forms are included.in Appendix E. <br /> 3.4. ANALYTICAL RESULTS OF GROUNDWATER SAMPLES <br /> f TPH-g was detected in the ground water sample collected from MW5 at a concentration of 110 µg/1. <br /> MTBE was detected'by EPA-Method 8020 in the ground water samples collected from MW 1,.MW2, <br /> MW4, MW5 and MW6 at concentrations-as-high as 3,900 -µg/l (MW4) and confirmed .by EPA <br /> -at concentrations as high,as 4 200 1.-No other analytes were <br /> . Method 8260 In the.same samples. c .µg/ yt - <br /> detected at or,above laboratory reporting limits in theground water samples. <br /> The analytical results of ground water samples are summarized on Table-3..The laboratory reports <br /> (MAI Lab I.D.No 89.494 through 89500),QA/QC reportand chain-of-custody form are included in . <br /> Appendix F. <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the data.collected from-the site,AGE concludes: -' <br /> • Ground water flow at the site on 31 January 2002-was inferred to be generally toward the. <br /> northeast at a gradient.of 0.002 feet/feet. S <br /> • Generally, light brown to tan, dry to saturated,poorly-graded sand was encountered from <br /> t surface grade to 'approximately 10 feet:bsg and at-20 feet bsg. Gray to brown, damp to = <br /> . saturated,sandy silt and silty clay was encountered at 15 feet bsg,25 feet bsg and 30 feet bsg. <br /> MTBE was detected'by EPA Method 8260 in the soil sample collected from MW5 at 20 feet <br /> at a�'concentration of 0.51 mg/kg. No other analytes'were detected at'or.above laboratory <br /> l - _ <br /> reporting.limits in the soil samples analyzed.The lateral and vertical extent of impacted soil <br /> Advanced.GeoEnvironmental,Inc. <br />