ARCHIVED REPORTS_XR0008977 - Laserfiche WebLink

Home Browse Search

' 22 February 1999 AGE-NC Project No 96-0263 ' Page 5 of 8 ' The ground water flow direction was calculated using ground water elevation data The ground water at the site is flowing to the north-northeast under an average gradient of 0 0047 Figure 6 illustrates the contoured ground water elevations as measured on 02 December 1999 For the January 2000 sampling event, depths to ground water ranged from 7 00 feet to 7 96 feet below the tops of the well casings Ground water elevations at the site ranged from 29 14 feet in ' MW8 to 29 59 in MW 1 The groundwater at the site is inferred to be flowing to the north-northwest under an average gradient of 0 0055 Figure 7 Illustrates the contoured ground water elevations as measured on 13 January 2000 I 3 3 HYDROCARBON-IMPACTED SOIL A total of 21 soil samples were analyzed for TPH-g, BTEX and MTBE and the suite of five fuel additives by EPA Method 8260 Modified ' TPH- was detected in soil samples analyzed from borings MW2, MW4, MW5, and MW6 at g p Y g concentrations as high as 150 milligrams per kilogram(mg/kg) The BTEX compounds were detected at concentrations as high as 0 82 mg/kg, 1 7 mg/kg,4 8 mg/kg and 14 mg/kg, respectively Petroleum hydrocarbons were not detected in soil borings MW 1 and MW3 IMTBE was detected in samples collected from monitoring wells MW2, MW4, MW5, MW6 and MW8 at concentrations as high as 3 0 mg/kg (MW2-5)by EPA Method 8020 MTBE was detected by EPA Method 8260 Modified at concentrations as high as 3,000 micrograms per kilogram (,ug/kg) in the same samples No other oxygenates were detected in the soil sample analysis Analytical results of soil samples are summarized on Table 2 The laboratory reports (MAI Sample ID Nos I 25443-25460 and 26607-26609),quality assurance and quality control(QA/QC)report and chain-of- custody hain-ofcustody forms are included in Appendix E 3 4 HYDROCARBON-IMPACTED GROUND WATER ' After the installation and development of the eight ground water wells on the site, each ground water monitoring wells were sampled Each sample was analyzed for TPH-g, TPH-d and BTEX, with analysis for MTBE and each sample was analyzed for the suite of five fuel additives IThe analytical results from the December sampling event are as follows TPH-g was detected in the water samples collected from monitoring wells MW2, and MW-4 through • MW-8 at concentrations up to 44,000 micrograms per liter (ug/1) The highest concentration of IAdvanced GeoEnvironmenta1,Inc I