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t2.2 Quarterly Monitoring Results
<br />A summary of the analytical results of the samples collected during the quarter is displayed in
<br />Table 1 while the complete analytical reports are presented in Appendix B To provide a review
<br />of trends in the analytical data, Table 2 presents a chronological record of the sampling results
<br />' of all previous sampling events at the site All sample numbers correspond to the well from
<br />which they were taken except for two quality assurance samples Sample MW -10 is a duplicate
<br />of primary sample MW -2 and sample MW -11 is a field decontamination procedure check sample
<br />' collected after sampling monitor well MW -2 Both of the quality assurance samples were
<br />analyzed only for TPH-G compounds as BTEX compounds have not recently been found onsite
<br />TABLE 1
<br />Analytical Results Summary
<br />Fourth Quarter 1993
<br />Well
<br />TPH-G
<br />(gg/L)
<br />Benzene
<br />(jug/L)
<br />TolueneEthylbenzene
<br />(jig/L)
<br />4
<br />(AgIL)
<br />Xylene
<br />(AgIL)
<br />MW -1
<br />ND,
<br />ND, u
<br />ND,,
<br />ND,,
<br />ND, 0
<br />MW -2
<br />ND,
<br />ND, o
<br />ND,,
<br />ND, o
<br />ND, o
<br />MW -3
<br />ND,
<br />ND,,
<br />ND, 0
<br />ND, a
<br />ND,,
<br />MW -4
<br />ND,
<br />ND, 0
<br />ND, 0
<br />ND, o
<br />ND,,
<br />MW -5
<br />ND,
<br />ND,,
<br />ND,,
<br />ND, o
<br />ND,,
<br />MW -6
<br />ND,,
<br />ND,,
<br />ND, o
<br />ND, 0
<br />ND, 0
<br />MW -10
<br />ND,
<br />NA
<br />NA
<br />NA
<br />NA
<br />MW -11
<br />NDS
<br />NA
<br />NA
<br />NA
<br />NA
<br />ND = Non-detectable at the level of detection noted
<br />NA = Not analyzed
<br />As shown on Table 1, there were no hydrocarbon compounds found in the groundwater at the
<br />site during this quarter This current finding is consistent with the historical data as no BTEX
<br />compounds have been found onsite since June of 1993 (and then only in well MW -2) For TPH-
<br />G, this is the first sampling event where no concentrations were found in any wells In the past,
<br />TPH-G has been found consistently in well MW -2 and sporadically in MW -3
<br />Regarding the QA samples, repeatability of non-detectable results was found between the field
<br />duplicate (MW -10) and the primary well sample (MW -2) The decontamination check sample
<br />(MW -11), collected after sampling MW -2, showed no detectable compounds present in field
<br />equipment after completion of a standard field decontamination procedure
<br />SiM%RF'MAREC4QTR WP 4 03M2194
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