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10 May 2000 <br /> AGE-NC Project No. 98-0460 <br /> Page 3 of 4 <br /> 479 ppm (10 feet bsg). Organic vapor was detected in two of the six samples collected from probing <br /> B2 at a concentration of 1 ppb. Organic vapor was not detected in samples collected from boring B3. <br /> 3.2. ANALYTICAL RESULTS OF SAMPLES <br /> TPH-g, TPH-d and TPH-mo were detected in soil collected at 10 feet bsg (sample B1-10) at <br /> concentrations of 1,800 parts per million (ppm, reported as mg/kg), 3,800 ppm and 2,300 ppm, <br /> respectively. Ethylbenzene and xylenes were detected in sample BI-10 at concentrations of 1.0 ppm <br /> and 3.2 ppm, respectively. Other petroleum hydrocarbon compounds were not detected in soil <br /> samples collected at the site,including the sample collected five feet below sample B1-10 (B1-15). <br /> Fuel oxygenates were not detected in the six soil samples analyzed from the site. <br /> Analytical results of soil samples are summarized on Table 1. The laboratory report(AAL Order No. <br /> A00041219) and chain-of-custody forms are included in Appendix B. <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> 4. <br /> Based upon data collected from the site, AGE concludes the following: <br /> `� • Petroleum hydrocarbons were detected in the sample collected from a depth of 10 feet in <br /> probing B I. Hydrocarbons were not detected in the remaining samples analyzed from the <br /> site. <br /> • The vertical extent of hydrocarbon-impacted soil appears to be limited to less than 15 feet <br /> below the former dispenser location. The lateral extent of impacted soil toward the west and <br /> east is limited by probings P2 and P3. <br /> • Primarily fine-grained soils were encountered at the site to the total depth explored. The <br /> ... lower permeability of these soils would retard the migrations of contaminants in soil from <br /> reaching ground water. <br /> The area over and around the former dispenser Iocation is paved with concrete and asphalt, <br /> limiting infiltration of ground water. <br /> 5.0. RECOMMENDATIONS <br /> Due to the limited lateral and vertical extent of impacted soil beneath the former dispenser location, <br /> `� the depth to ground water and the fine-grained nature of the soil beneath the site, AGE recommends <br /> no further action be required for the former UST and dispenser locations. <br /> Adratrred CeuEriN-irvrnnental,Inc. <br />