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<br /> 10 April 2001
<br /> i AGE-NC Project No 96-0235 r
<br />' Page 3 of 5
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<br /> I screened intervals in monitoring wells MW-1, MW-2, MW-6B, MW-8B, MW-9, MW-11B,
<br /> MW-12B and MW 13B comprising the deepenwater data set Groundwater was within the shallow
<br /> screened intervals for wells MW-5,,MW-6A,MW-7, MW-8A, MW-10;MW,11A, MW-12A, MW- _
<br />' 13A and EW-1, comprjsing the shallow water data set Ground water was approximately 13 69 feet '
<br /> and 12 50 feet above the'screened interval in MW-3 and EW-2,.respectively MW-3 and EW-2 are
<br /> screened between the shallow'and deep ground water Figure 3 illustrates the ground water elevations
<br />'y based on the two data sets Ground water flow direction near the former UST cluster was inferred
<br /> to be toward the east-northeast using data from wells screened within the upper Interval and toward r
<br /> the southeast using data from wells screened within the lower'mterval Groundwater flow direction
<br />' near the former UST No 3 excavation was inferred to be toward the northeast using data from wells
<br /> screened within the upper interval and toward the east using data from wells screened within the
<br /> lower,interval `
<br /> 3 2 ANALYTICAL RESULTS OF WATER SAMPLES
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<br /> TPH-g was detected in the-samples collected from MW-1, MW-2, MW-10, MW-11B, EW-1 and
<br />'. EW-2 at concentrations as high as 39,000 micrograms per liter(µg/1) TPH-d was detected in MW-1,
<br /> MW-2, MW-10, MW-11B, MW-12A, MW-13A, MW-13B and EW-1 at concentrations as high as
<br /> 60,000 gg/1 BTEX compounds were detected in samples from 6 of the 20 wells at concentrations
<br />' as high as 970 gg/l (benzene), 7,000 gg/1 (toluene),'1,300 gg/1 (ethyl benzene) and 5,300 gg/1
<br /> (xylenes)
<br /> MTBE was detected in the water samples icollected from MW-9, MW-1'0, MW-11B, MW-12B,
<br />' MW-13A, MW-13B and EW-1 at concentrations ranging from 5 5 gg/1 to 300 gg/l TBA was
<br /> detected in water samples from MW-2, MW-6B and MW-11 B at concentrations ranging`from ,
<br /> 12 gg/l to 20 gg/l EDB was detected in the water sample analyzed from`EW-1 at a concentratioA
<br /> of 6 5 ggh `Water samples analyzed from 4W-2, MW-11B and EW-1 contained detectable
<br /> concentrations of 1,2 - DCA ranging from 11 gg/1 to 30 gg/1 Analytical results of water samples
<br /> collected during the first quarter of 2001 are summarized on Table 2 and 3,'analytical results'from
<br /> previous monitoring events are summarized on`Tables 4 and 5 Figures 4 and 5 Illustrate the ground
<br /> water contamination plumes in upper and lower groundwater intervals' The laboratory report(MAI T ._
<br />' r Lab IDs 62688 through-62706), chain-of-custody forms and the laboratory QA/QC report are
<br /> Included in Appendix B 1 '
<br /> 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 GeoEnvironmental,Inc
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