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Groundwater Conditions <br /> Groundwater occurred in wells at a depth of about 7.3 to 7.8 feet below the surface (see <br /> Table 1). A groundwater contour map was prepared; the historic groundwater flow <br /> direction is north northwesterly(see Figure 1). Water levels in the wells declined since the <br /> previous measurements and the calculated flow gradient this quarter is 0.001. <br /> Chemical Analysis <br /> One groundwater samples were analyzed at STUChromalab,Inc., a State certified analytical <br /> laboratory from the monitoring and domestic wells. The sample was tested for the <br /> following; Total Petroleum Hydrocarbons as Gasoline (TPHG) and Diesel (TPHD), <br /> Benzene (B), Toluene (T), Ethylbenzene (E) and Xylene (X), Methyl-tert-butyl-ether <br /> (MTBE) and fuel oxygenates, 1,2 Dichloroethane and Ethylene Dibromide using EPA <br /> Methods 3510/8015, 8020, 8240 and 8260. The analyses were run on a "normal" <br /> turnaround(five-to ten working days). The results are presented in Figure 2 and Table 2 <br /> and historic data in Tables 3 and 4 below. <br /> Table 2. Groundwater Monitoring Well Chemical Data,June 2004 <br /> Sample TPHD TPHG Ben Tot Ethyl Xyl TBA MTBE DIPE ETBE TAME 12 EDB <br /> DCA <br /> �. ug/1 ug/l ug/l ug/1 ug/l ug/l ug/l ug/l ug/1 ug/1 u9/1 ug/l ug/l <br /> Mw-1 NS NS NS NS NS NS NS NS NS NS NS NS NS <br /> MW-2 NS NS NS NS NS NS NS NS NS NS NS NS NS <br /> MW-3 510# ND ND ND ND ND ND ND ND ND ND ND ND <br /> Equipment ND ND ND ND ND ND ND ND ND ND ND ND ND <br /> Blank <br /> Lab Blank ND ND ND ND ND ND ND I ND ND ND ND I ND ND <br /> ND—None detected. NS—Not sampled. See laboratory reports. #-Laboratory reports the diesel results do not match the diesel <br /> standard. <br /> Discussion <br /> TPHD contaminants were observed at MW-3 at 510 micrograms per liter(ug/1) during this <br /> sampling event. This is an increase from the previous sampling. Highly degraded TPHD <br /> has been observed at MW-3 previously and the laboratory reports that this result did not <br /> match the laboratory standard for Diesel. The increased TPHD.. may be due to drainage <br /> from the former tank pit in the area around the well given thee-water level decline.- <br /> Page <br /> eclinePage 2 of 4 <br />