ARCHIVED REPORTS_XR0010250 - Laserfiche WebLink

Home Browse Search

20 November 2002 AGE-NC Project No 01-0827 Page 4 of 5 I33 MASS CALCULATIONS Based on the hydrocarbon concentration of TPH-d/TPH-mo in previous soil boring Sam les and th_ av can=ntrations of TPH- PH-mo in soil from the excavation, an estimated 82 kilograms I of diesel and 176 kilograms of motor oil were removed om the site unng the soil excavation roce ures The mass an vo ume d in Appendix D I 4.0. SUMMARY AND CONCLUSIONS Based on the data collected from the site, AGE finds I 0 Approximately 82 kilograms, or 25 gallons, of diesel and 176 kilograms, or 55 gallons, of motor oil were removed from the site, however, low concentrations of TPH-mo were still detected in soil samples collected from the base and south and west walls of the excavation The maximum TPH-mo concentrations remaining in soil were detected on the south wall of ' the excavation at a maximum concentration of 510 mg/kg • BTEX compounds were detected in samples collected from the south wall of the soil I• excavation at low concentrations, the maximum concentration was 1 0 mg/kg toluene collected from the soil sample at 25 feet bsg I e Ground water was present within the excavation at a depth of 25 feet bsg after a duration of 48 hours No water samples were collected during this investigation, however, laboratory analysis of grab ground water samples collected from soil bonngs P1 through P5 (see IFigure 2)during the preliminary site investigation of 08 and 15 July 2002 did not detect any analytes of concern . I • To date, AGE's ground water monitoring results at the Fire Station No 2 north UST area inferred that the ground water flow direction have been consistently northeast or east 5.0. RECOMMENDATIONS Based on the findings of the remediation activities recounted in this report, AGE recommends no further site assessment of the fuel oil release I 1 Advanced GeoEnvaonmental,Inc I