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1 <br /> 21 December 2002 <br /> AGE-NC Project No 99-0559 <br />' Page 7 of 8 <br />' • Free product continues to be present in well MW-2 and was detected for the first time in well <br /> MW-3, located at the south end of the UST area <br /> • The highest concentrations of petroleum hydrocarbons detected at the site were present in <br />' the ground water samples collected from wells screened in HUI and HU2 at the UST area <br /> and well MW-8 off-site to the east In addition, a high concentration of petroleum <br /> hydrocarbons was detected from a water sample collected from well MW-7D, screened In <br />' HU5L <br /> • In general,the concentrations of TPH-g and BTEX compounds increased significantly from <br />' the previous quarter, TPH-g and BTEX compounds were detected for the first time in well <br /> MW-8E <br />' • With the exception of wells MW-I through MW-3, and MW-5C and MW-5D, MTBE <br /> increased noticeably from the previously quarter <br /> • TAME was detected for the first time in wells MW-4 and MW-5A, 1,2-DCA was detected <br />' for the first time in well MW-4 <br /> • BTEX compounds,MTBE and 1,2-DCA are present at the site at concentration levels above <br /> the DHS's Maximum Contaminant Levels for drinking water <br />' <br /> The lateral and vertical extent of impacted ground m un water has not been defined at the site <br /> I <br /> 5.0. RECOMMENDATIONS <br />' Based on the findings and conclusions in this report, AGE recommends the following <br />' Continue quarterly ground water monitoring, the next quarterly monitoring event Is <br /> scheduled for December 2002 <br />' Installation of additional monitoring wells to define the lateral and vertical extent of <br /> petroleum hydrocarbons-impacted ground water and to verify the source of the apparently <br /> high concentrations of petroleum hydrocarbons detected this quarter in multi-level well <br />' MW-8 <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 mainly <br /> upon analytical results provided by an independent laboratory Evaluations of the hydrogeologic <br />' conditions at the site for the purpose of this investigation are made from a limited number of <br /> available data points (e g ground water samples), and subsurface conditions may vary away from <br />' Advanced GeoEnvironmental,Inc <br />