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Page 4 <br /> Mr Michael Infurna Jr,Senior REHS <br /> August 21,2000 <br />' samples collected from these wells by GZA in July 1999 did not contain <br /> detectable concentrations of TPHg or BTEX compounds However, TPHg and <br /> BTEX compounds were detected m samples collected on June 29, 2000 from <br />' MW-1 and MW-3 TPHg was measured in MW-1 and MW-3 groundwater <br /> samples at 1,300 ug/1 and 1,600 ug/l, respectively Benzene was measured in <br /> MW-1 and MW-3 groundwater samples at 150 ug/l and 170 ug/l,respectively <br /> Three oxygenate compounds were also measured during this recent monitoring <br /> event The groundwater sample collected from well MW-2 contained TBA, <br /> MTBE, and DIPE at concentrations of 110 ug/l, 9 2 ug/l, and 8 4 ug/l, <br /> respectively Oxygenate compounds were not detected in the samples collected <br />' from wells MW-1 and MW-3 Oxygenate compounds were not detected during <br /> the preliminary subsurface investigation performed by Philip on April 16, 1998 <br />' Conclusions <br /> Based on current monitoring data, groundwater was measured in the monitoring <br /> wells at a depth of about 23 feet below the ground surface Groundwater was <br /> evaluated to flow southeasterly at an approximate gradient of 175 x 10"3 feet per <br /> foot <br /> 1 <br /> Current groundwater monitoring results indicate that relatively high <br /> concentrations of TPHg and BTEX compounds were detected in the MW-2 <br /> groundwater sample The extent of this impact can not delineated at this time <br /> TPHg and BTEX compounds were also detected in the most recent samples <br /> collected from MW-1 and MW-3 Petroleum hydrocarbons had not been detected <br /> in the initial set of samples that were collected from these wells in July 1999 <br />' IPE were TBA, MTBE, and D e detected in the most recent sample collected from _ <br />' well MW-2 Previous samples collected near this location did not contain <br /> oxygenate compounds <br /> It is unclear whether the petroleum hydrocarbons detected in MW-1 and MW-3 <br /> samples, and the oxygenates detected in the MW-2 sample are anomalous Philip <br /> will continue to monitor conditions at this site to assess subsurface conditions <br /> The next scheduled monitoring event is planned for September 2000 <br /> 1 <br />