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19 January 2005 <br /> . AGE-NC Project No 00-0769 <br />' Page 7 of 7 <br /> a gradient of 0 001 ft/ft The HU-4 potentiometric surface consists of a northeast-plunging <br />' ridge, ground water flows generally toward the northeast and northwest at approximately <br /> 0 03 ft/ft to 0 007 ft/ft (Figures 3 through 6) <br />' The most highly impacted ground water appears to be located near the former USTs <br /> Laterally, analytes of concern were detected at or above laboratory reporting limits in all <br /> wells except multi-level wells MW-8 and MW-9 and single-level well MW-2A, vertically, <br />' hydrocarbon-impacted ground water was detected in each of the screened intervals of multi- <br /> level wells MW-4 through MW-7 , <br />' The lateral and vertical extents of petroleum hydrocarbon-impacted ground water have not <br /> ' been defined The vertical extent of the fuel additive 1,2-DCA is not defined, however, the <br /> lateral extent of 1,2-DCA appears to be defined except to the southeast <br />' s BTEX compounds and 1,2-DCA are present in on-site monitoring wells at concentrations <br /> that exceed the DHS's Maximum Contaminant Levels (MCLs) for these contaminants in <br />' drinking water <br /> 5.0. RECOMMENDATIONS <br /> Based on this and previous site investigations, AGE recommends <br /> 1 <br /> • Continued quarterly monitoring of the well network <br /> • Conduct additional contaminant assessment east of the current monitoring well network, <br /> utilizing grab ground water sampling for potential monitoring well placement <br /> 1 <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 hydrogeologic conditions <br /> at the site for the purpose of this investigation was made from a limited number of available data <br /> points(i e ground water samples)and subsurface conditions may vary away from these data points <br /> No other warranty,expressed or implied;is made as to the professional interpretations,opinions,and <br /> recommendations contained in this report <br /> 1 , <br /> Advanced GeoEnvironmental,ine <br />