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May - 13, 2004 2 06PM �! 0• Anderson & Assoc . *MO No- 5095 P. 4 <br /> law <br /> TgW QUARTER,2003 <br /> GROUNDWATER MONITORING REPORT <br /> JAMAR OIL DISTRIBUTION <br /> NOVEMBER 2003 <br /> Total xylenes were detected in the samples from all of the wells except MW-5, MW-6A, MW-611, <br /> MW-7A and MW-713 at concentrations ranging from 28.6µg/1 in MW-3 to 19,200µg/l in EW-1. <br /> MTBE was detected in the samples from all of the wells except MW-3, MW-6A and MW-7A at <br /> concentrations ranging from 11 µg/1 in MW-5 to 180,000µgll in MW-1. Tertiary butyl alcohol <br /> (TBA)was detected in the sample collected from MW-1 at 3,600µgA. DIPE, ETBE, and TAME <br /> were ND in all samples taken this quarter. 1,2 DCA was detected in samples from MW-I, MW-2 <br /> MW-4,MW-613 and EW-1 at concentrations ranging from 11 µg/1 in MW-2 to 2,900µg/1 in <br /> MW-1. <br /> The pH measurements taken this quarter during monitoring well purging were all lower than <br /> would be expected. This appears to be due to instrument malfunction. The pH meter will be <br /> checked and recalibrated prior to the next monitoring event. Water temperature stabilized <br /> 'during purging with maximum variation between the 2°'and 34 well volume extraction of 0.1°C. <br /> Groundwater analytical data are summarized in Table 2 and shown on Figure 5. Copies of the <br /> =.laboratory reports with COC documentation are included in Appendix C. <br /> Discussion <br /> The level of hydrocarbon constituents in the offsite wells remained relatively low except for <br /> MTBE in MW-613, which was reported at 2,600µgll MTBE. In both sets of cluster wells, <br /> concentrations dropped in the deeper wells for all constituents,except MTBE in MW-613, <br /> which was essentially unchanged and TPH-G in MW-6A, which increased. As in the last <br /> quarter,the deeper wells(B), showed higher concentrations than the shallower wells(A), <br /> however the differences were smaller this quarter. Monitoring well MW-1 showed the highest <br /> results of any of the wells. EW-1 and MW-1 appear to represent the heart of the impacted <br /> groundwater plume. The other onsite wells showed similar results to those found the last three <br /> quarters, which are less than historical levels. <br /> SCHEDULE <br /> The next quarterly monitoring event is scheduled for December 2003. The Fourth Quarter 2003 <br /> �; Monitoring Report will be submitted by January 31, 2003. <br /> 6 <br />