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<br /> 20 December 2001
<br /> AGE-NC Project No' 96-0235
<br /> Page 3 of 5 n
<br /> MW-12B and MW-13B comprising the deeper water data set Ground water was within the screened
<br />' intervals of wells MW-5, MW-6A, MW-7, MW-8A, MW-10, MW-11A, MW-12A, MW-13A and
<br /> EW-1,, comprising the shallow water data set Ground water was_approximately 11 85 feet andW
<br />' 10 63 feet above the screened interval In MW-3 and EW-2, respectively M -3 and EW-2 are
<br /> screened between the shallow and deep groundwater Figure 3 illustrates the groundwater elevations
<br /> based on the two data sets Ground water flow direction near the former UST cluster was inferred
<br /> to be toward the east-southeast using data from wells screened within the upper and lower intervals
<br />' Ground water flow direction near the former UST No 3 excavation was Inferred to be flowing
<br /> radially toward the west-southwest using data from wells screened within the upper interval and
<br />' toward the south-southwest using data from wells screened within the lower interval The inferred
<br /> ground water gradient in the shallow zone was 0 003 ft/ft near the former UST cluster and 0 014 ft/ft
<br /> near the former UST No 3 location The inferred ground water gradient m the deep zone was 0 002
<br />' ft/ft near the former UST cluster and 0 013 ft/ft near the former UST No 3
<br />' 3 2 ANALYTICAL RESULTS OF WATER SAMPLES
<br />'. TPH-g was detected in the samples collected from MW-1, MW-2, MW-10, MW-11B, MW-12B,
<br /> MW-13B, EW-1 and EW-2 at concentrations as high as 65,000 micrograms per liter (µg/1) in the `
<br /> sample collected from EW-1 TPH-d was detected in samples collected from MW-1, MW-2,MW-9,
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<br /> MW10, MW-11B, EW=1 and EW-2 at concentrations as high as 20,000 gg/l (MW-10) Various
<br /> BTEX compounds were detected in samples from 8 of the 20 wells at concentrations as high as
<br /> 2,300 gg/lbenzene(MW-1),9,500µg/ltoluene(EW-1'),2,600 Rg/lethylbenzene(EW-1)and 11,000
<br /> 1 pg/l xylenes-(EW-1)
<br /> MTBE was detected in the water samples collected. from MW-9, MW-10, MW-11 B, MW-12B,
<br />' MW-13A, MW-13B and EW-1 at concentrations ranging from 26 µg/l to 340 gg/l Water samples
<br /> analyzed from MW-1, MW-2; MW-5, MW-6A, MW-6B, MW-7, MW-11B, MW-12B and EW-2
<br /> contained detectable concentrations of 1,2-DCA ranging from 1 3 µg11 to 55 µg/1 EDB was not
<br /> detected in any of the samples collected from the 20 on site wells Analytical results of water
<br /> L samples collected during the third quarter of 2001 are summarized on Table 2 and 3, analytical
<br /> results from previous monitoring events°are summarized on Tables 4 and 5 Figures 4 and 5 illustrate'
<br /> the ground water contamination plumes in upper and lower giound water intervals The laboratory
<br /> report (MAI Lab IDs 76359 through 76378), chain--of-custody forms and the laboratory QA/QC ,
<br /> report are included in Appendix B
<br /> 1 4.0. SUMMARY AND CONCLUSIONS
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<br /> Based on the data collected from the former UST No 3 area, AGE finds
<br /> � Advanced C,eoEnvixonmental,Inc
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