ARCHIVED REPORTS_XR0008291 - Laserfiche WebLink

Home Browse Search

i i03 October 2003 • AGE-NC Project No 97-0290 iPage 6 of 6 ! 0 The highest concentrations of dissolved petroleum hydrocarbons were detected in samples collected from wells MW-2 and MW-4,petroleum hydrocarbons were not detected in wells MW-5 to MW-8 flus quarter • Concentrations of TPH-g and benzene in well MW-4 have exhibited declining trends over the past two years, yet the same concentrations have increased in the sample from well MW-2 as depicted in Appendix E • The overall influent hydrocarbon vapor concentrations increased during the second quarter During second and third quarters 2003, an estimated 1550 lbs gasoline (TPH-g) were removed from the subsurface of the site • Continued operation of the 1AS with SVE should result in a reduction of the hydrocarbon impact to soil and ground water 5.0. RECOMMENDATIONS Based on the findings of the environmental activities recounted in this report, AGE recommends • Due to the elevated dissolved concentrations in well MW-2 and the continual significant vapor concentrations, continued monthly operation and monitoring of the IAS and SVE operation 0 Continued quarterly ground water monitoring,the next monitoring event should be scheduled for December 2003 6.0. LIMITATIONS Our professional services were performed using that degree of care and skill ordinarily exercised by environmental consultants practicing in this or similar localities The findings were based upon analytical results provided by an independent laboratory Evaluation of the subsurface conditions at the site for the purpose of this investigation was made from review of a limited number of available data points (soil vapor and ground water samples) and subsurface conditions may vary away from these data points No other warranty, expressed or implied, is made as to the professional interpretations, opinions and recommendations contained in this report • Advanced GeoEnvironmental,Inc