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20 July 1998 • AGE-NC Project No 95.0137 Page 5 of 8 32 LABORATORY RESULTS OF SOIL SAMPLES TPH-g was detected in three of the eleven soil samples analyzed, and was encountered in borings ' B 19 and B21 BTE&X was detected in six sample TPH-g was detected at the highest concentration of TPH-g was detected in a sample collected from the former UST area(VW-1)at a depth of 20 feet bsg Soil samples collected and analyzed from the western portion of the former UST area from depths to twenty feet had detected TPH-d at concentrations of 1,400 parts per million ppm(reported in milligrams per kilogram) Soil samples collected from the Jimco Truck Stop at depths of twenty ' feet bsg also were impacted with TPH-d at concentrations of 490 ppm Benzene was only detected in the soil sample collected from a depth of ten feet bsg in the former ' UST area, soil sample B19-20 Other BTE&X compounds were detected in the soil samples at concentration as great as 8 6 ppm, xylene (B 19-20) ' No Oxygenated compounds were detected in the soil samples analyzed Volatile organic compounds (VOCs) were detected in soil samples collected at various , . concentrations Noteworthy was the detection of the compound napthalene at a concentration of 2,600 parts per billion ppb(reported in micrograms per kilogram), at a depth of twenty feet bsg in the western portion of the former UST area(1319-20) The highest concentration of VOCs detected ' in the soil samples was 1,3,5-tnmethylbenzene at a concentration of 12,000 ppb ' Analytical results of soil samples are summarized in Table i -Analytical Results of Soil Samples- Analyzed by EPA methods 8015 and 8020 and in Table 2 - Analytical Results of Soil Samples - Analyzed by EPA methods 8260/8260m ' The laboratory report (MAI Laboratory ID 89246 through 89256), QA/QC reports and chain-of- custody hain-ofcustody are in Appendix D 3 3 GROUND WATER GRADIENT AND FLOW DIRECTION Depth to ground water at the site ranged from 14 05 to 15 39 feet below surfacegra (bsg)de s The data indicates an average increase of the relative ground water elevation at the site of 4 3 feet in the ' ground water momtonng wells since January 1997 The relative ground water elevation ranged from 83 51 to 84 61 feet The range of measured depth to ground water,between May 1994 and May 1998 are 14 05 to 2105 feet bsg, with the shallowest ground water recorded during this quarter The ' ground water gradient calculated from May 1998 for the site was steeper on the monitored portion of the Jimco Truck Stop,directed north to northwest The ground water gradient was shallow on the ' RFS site, when compared to the Jimco portion of the site, directed towards the northwest Advanced GcoEnvironmcntal,Inc