Laserfiche WebLink
01 October 2004 <br /> AGE-NC Project No 99-0657 <br /> Page 4 of 4 <br /> s <br /> • Concentrations of dissolved TPH-g, BTEX and fuel additives have decreased this quarter <br /> in MW-1, MW-2, MW-3 and MW-5, while concentrations of TPH-g and MTBE have <br /> increased in wells MW-4 and MW-6 Concentrations of BTEX have decreased this quarter <br /> in wells MW-4 and MW-6 The coincidence of these trends may likely indicate an active <br /> migration of the dissolved phase hydrocarbon plume or the localized desorption of additional <br /> hydrocarbons at the former UST area <br /> i0 The lateral extent of ground water has been defined to the north, east and southeast of the <br /> UST area The lateral extent of impacted soil in the vadose zone has been defined <br /> • The vertical extent of petroleum hydrocarbon-impacted ground water is defined off-site in <br /> the area of soil boring CPT-1 However, the vertical extent is undefined in the area of and <br /> down-gradient from the former UST area (CPT-2 and CPT-3) <br /> 5.0. RECOMMENDATIONS <br /> Based on the findings of this investigation, AGE recommends <br /> lie Continuation of the quarterly ground water monitoring program, as required by the EHD <br /> • Implementation of the AGE-prepared Monitoring Well Installation Work Plan,dated 28 July <br /> I2004,and approved by EHD letter dated 08 September 2004 If necessary access agreements <br /> cannot be obtained 1n a timely manor for the off-site monitoring wells, the scope of work <br />' should be performed in two phases (on- and off-site) AGE believes the vertical definition <br /> of soil ground water contamination on-site is integral to the assessment and the eventual <br /> remediation of the site <br /> I6 0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordmanly exercised by <br />' environmental consultants practicing in this or similar localities The findings were based upon <br /> analytical results provided by an independent laboratory Evaluation of the geologic/hydrogeologic <br /> conditions at the site for the purpose of this investigation was made from a limited number of <br /> I available data points(ie groundwater samples)and subsurface conditions may vary away from these <br /> data points No other warranty, expressed or implied, is made as to the professional interpretations, <br /> opinions and recommendations contained in this report <br /> I <br /> IAdvanced GcoEnvironmental,ane <br />