Laserfiche WebLink
i3 <br />' 27 February 2004 ' <br /> • AGE-NC Project No 99-0624 <br />' Page 4of4 <br /> source upgradient of well MW-2 A trend analysis of MTBE is depicted in Appendix D The <br />' MTBE concentrations were above the Primary MCL of 13 µg/1 in drinking water <br /> • MTBE was not detected this quarter in well MW-7, this 1s the second time in four sampling <br /> events that MTBE was not detected above laboratory reporting limits The vertical extent of <br />' MTBE-impacted ground water is generally defined, below MCL concentrations <br /> • The lateral extent of MTBE-impacted ground water has not been defined to the north, east <br />' and south of the UST area An Iso-concentration map depicting the approximate distribution <br /> of dissolved MTBE is presented 1n Figure 4 <br />' • The elevated concentrations of petroleum hydrocarbons detected in samples collected from <br /> well MW-2 indicate that this well is within or near the dissolved petroleum hydrocarbon <br /> "core area" of the on-site plume <br />' 5.0. RECOMMENDATIONS <br /> Based on the findings of this investigation, AGE recommends <br />'. Continuation of the quarterly ground water monitoring program The next monitoring event <br /> should be performed in May 2004 <br />' • Installation of the proposed off-site ground water monitoring well, that could not be <br /> completed during the July 2003 drilling activities, to assess the lateral extent of <br /> MTBE-impacted ground water <br />' • Performance of a receptor survey to locate potential receptors within 2,000 feet of the site <br /> • Preparation of a feasibility studies report to evaluate soil and ground water remediation <br />' alternatives at the site <br />' 6.0 LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily 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/hydrogeologfc <br />' conditions at the site for the purpose of this investigation was made from a limited number of <br /> available data points (ie soil and ground water samples) and subsurface conditions may vary away <br /> from these data points No other warranty, expressed or implied, is made as to the professional <br />' interpretations, opinions and recommendations contained in this report <br />' Advanced GeoEnvironmental,Inc <br /> 1 ' <br />