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1 <br /> ' THIRD QUARTER,2001 <br /> . Q � <br /> ' GROUNDWATER MONITORING REPORT <br /> JAMAR OIL DISTRIEUTION <br /> SEPTEMBER 2001 <br /> t The direction of groundwater flow has been calculated to be trending to the south-southeast with <br /> a hydraulic gradient of approximately 0 001-feet/feet across the site as shown on Figure 5 <br /> Calculated groundwater elevations are summarized in Table 1, and shown on Figure 5 <br /> Groundwater Analytical Results <br /> ' TPH G, benzene and MTBE were detected in samples taken from all wells this quarter at <br /> concentrations ranging from 280,000 micrograms per liter (µg11), 31,000µg11, and 160,000 µg11, <br /> ' respectively in MW-1,to 130µg/l, 5 9µg11 and 49 12g/1,respectively in MW-5 TPH D was only <br /> detected in the sample from MW-1 at 82µg/1 Toluene was detected in samples from MW-1, <br /> MW-4 and MW-5 at concentrations of 12,000µg/1, 190 µg11 and 3 4µg/1, respectively <br /> tEthylbenzene was detected in samples from MW-1 and MW-3 at concentrations of 900µg11 and <br /> 520µg/l, respectively Total xylenes were detected in samples from MW-1, MW-3,MW-4, and <br /> MW-5 at concentrations of 5,900 ug/l, 1,800µg11, 580µg11, and 3 8 µg11, respectively. Tertiary <br /> butyl alcohol(TBA) was detected in samples four MW-2 and MW-5 at concentrations of 200 4g11 <br /> and 160 µgli, respectively DIPE, ETBE, TAME,EDB and 1,2 DCA were non-detect in all <br /> samples taken this quarter <br /> Groundwater analytical data are summarized m Table 2 and shown on Figure 4 Copies of the <br /> laboratory reports with COC documentation are nicluded in Appendix B <br /> ' CONCLUSIONS <br /> Generally, the petroleum hydrocarbon concentrations and MTBE have remained relatively <br /> ' consistent over the last two years The highest concentrations are found in the wells in the direct <br /> vicinity of the underground storage tank excavation, MW-1 and MW-2, and in the most down <br /> gradient well MW-4 The extent of impacted groundwater remains undefined at the site <br /> GHH will continue to monitor the site on a quarterly basis with the next quarterly sampling event <br /> scheduled for October 2001 At that time,the nearest domestic groundwater well will also be <br /> located and sampled The Fourth Quarter Monitoring Report will be submitted by January 15, <br /> 2002 <br /> 1 <br /> ' 6 <br />