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i <br /> i13 July 1998 <br /> AGE-NC Project No 96-0254 <br /> iPage 5 of 7 <br /> iANALYTICAL RESULTS <br /> TPH-g was detected in three of the seven soil samples analyzed TPH-g was detected at <br /> i concentrations as high as 980 parts per million(ppm,reported as milligrams per kilogram) at a depth <br /> of 5 feet bsg in boring B 14, which is located directly north of the former UST area TPH-g was not <br /> detected in soil from depths greater than 5 feet bsg and less than 20 feet bsg A soil sample collected <br /> ifrom a depth of 20 feet bsg in boring B 14 contained I 7 ppm TPH-g <br /> Benzene was detected in soil samples collected from depths equal to or less than 10 feet bsg at <br /> iconcentrations ranging from 0 008 (benzene, 1314-10')to 18 ppm (benzene, B14-5') Other BTE&X <br /> compounds were also detected at 5 feet bsg in borings B14 at concentrations as high as 89 ppm <br /> iTPH-d was only detected in B14 at a depth of 5 feet bsg at a concentration of 300 ppm <br /> No petroleum hydrocarbons or BTE&X compounds were detected in the soil samples collected from <br /> borings BIO, BI 1, B 12 or B13 <br /> i Laboratory results of soil samples analyzed for petroleum hydrocarbons are summarized in Table <br /> I -Analytical Results of Soil Samples The laboratory reports (MAI Laboratory ID 85855 to 85861), <br /> QA/QC reports and chains-of-custody are Included in Appendix D <br /> i <br /> 33 GROUND WATER ELEVATION AND GRADIENT <br /> The round water elevation in each well was calculated e <br /> g s a culated by subtracting the depth to ground water <br />' from the surveyed casing elevations (Table 4) <br /> Ground water gradient 27 February 1997 was calculated to be an average of 0 01 foot/foot directed <br /> i toward the northwest on the site, shifting toward the north-northeast northward of the site The <br /> contoured ground water elevation data from the site is illustrated in Figure 3 <br /> 3 4 HYDROCARBON-IMPACTED GROUND WATER <br /> TPH-g was detected ground water samples collected from both screened intervals of well MW-1, <br /> installed directly down gradient from the former UST area TPH-g was detected in well MW-IA and <br /> MW-113 at concentrations of 5,000 and 4,300 parts per billion (ppb, reported as micrograms per <br /> liter), respectively TPH-d was detected only m well MW-IAand MW-1B at concentrations of 1,400 <br /> ppb and 1,200 ppb <br /> Advanced GeoEnâ–șiron mental Inc <br />