Laserfiche WebLink
23.Apri11999 <br /> AGE-NC Project No. 98-0440 <br />' Page 4 of 5 <br /> could greatly modify.'ground water flow direction. <br /> Ground water elevation at the site increased an average 1.94 feet between the October 1998 <br /> and the January 1999 ground water monitoring events. <br /> 'TP -g was detected in a water sample collected(from well MW-2 at a concentration of,2,700 <br /> micrograms per liter(,ug/l); however the laboratory reported unmodified or weakly modified ' <br /> gasoline in this sample was significant: <br /> TPH-d was detected 'in ground water samples collected from MW-1. and MW-2 at <br />' concentrations as high as 1;500 ug/1; ,however the laboratory reported that the diesel <br /> chromatograms for the samples_did not have typical diesel characteristics. . <br /> • 1 . - <br /> MTBE was not detected above laboratory reporting limits from any of the analyzed samples <br />' utilizing EPA Methods 8020 and 8.260; none of the analyzed fuel oxygenates were detected <br /> at,concentrations above laboratory reporting limits-from the analyzed samples. <br />' BTEX compoundswe're detected-in-ground water samples collected from wells MW-2 and <br /> MW-3 at concentrations ranging as high as 340 yg/l (benzene, MW-2). <br /> I• From October. 1998 to January 1999,. a decrease in dissolved petroleum hydrocarbon <br /> concentrations was observed in viwell MW-2 (Table 2): <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 plume (Figure 4). <br /> 5.0 RECOMMENDATIONS <br /> 'Based-upon the results of this investigation, AGE recommends: <br /> • Continued quarterly ground water monitoring. The next quarterly monitoring and.samplingr <br /> is scheduled for April 1999: " <br /> Preparation of a Work Plan Addendum to assess dissolved,petroleum hydrocarbons northeast <br /> .of MW-2. <br /> 6.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by r <br /> environmental consultants practicing in this or similar localities..The findings were based upon.. <br /> Advanced GeoEnvironmental,Inc. - <br />