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J t r + r I 1 s 22 July 2002 uA AGE-NC Project No 97-0312 ' Page 5 of 5 u conditions near the top of the saturated zone where fuel hydrocarbons would be expected to ' have the greatest Impact • During the June 2002 monitoring event TPH-g,TPH-d,and various BTEX constituents were ' detected in the water samples collected from monitoring wells UST-1 and UST-5 Low concentrations of TPH-d, benzene, toluene and xylenes were detected in the water sample from UST-2 • During the June 2002 monitoring event 1,2-DCA was detected in samples UST-5 and UST-6 at concentrations well above the DHS Maximum Contaminant Level(MCL)of 0 5 µg11 PCE ' was detected in sample UST-1,but at concentrations below the MCL of 5 µg11 , • During the June 2002 monitoring event, 1,1-DCA, 1,2-DCE and PCE were detected in, samples collected from the small domestic well at concentrations of 0 59 µg11,0 64 µg/1 and ' 9 3 µg11, respectively The concentrations of PCE and 1,2-DCA detected in the small domestic well sample were above the MCL of 5 µg11 and 0 5 µg/1 ' During May 2002,PCE was detected at a concentration of 11 µg11 in the small domestic well sample, the concentration was above the MCL of 5 µg/l • With exception of the analytes detected in samples collected from the small domestic well, the reported concentrations and lateral extent of analytes of concern have remained relatively stable during the past two years of monitoring = 1 l 5.0. RECOMMENDATIONS 1 Based on the results of the quarterly ground water monitoring event, AGE recommeds continued ' monitoring of the on-site monitoring and domestic wells The next monitoring event should be scheduled for September 2002 6.0. LIMITATIONS , Ourprofessional services were performed using that degree of care and skill ordinarily exercised by environmental consultants practicing in this or similar localities The findings were based mainly" upon analytical results provided by an independent laboratory Evaluation of the hydrogeologic ' conditions at the site for the'purpose of this Investigation was made from a limited number of available data points (I c monitoring wells and domestic well samples) and subsurface conditions may vary away from these data points No other warranty, expressed or implied, is made as to the professional interpretations, opinions and recommendations contained in this report 1 _ Advanced GeoEnvironmentai,Iric