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2.2 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-11 is a field <br /> decontamination procedure check sample collected after sampling monitor well MW-3 and <br />' sample MW-10 is a duplicate of primary sample MW-3 Both of the quality assurance samples <br /> were analyzed only for TPH-G compounds <br />' TABLE 1 <br /> Analytical Results Summary <br /> Third Quarter 1993 <br /> Well TPH-G Benzene Toluene Ethylbenzene Xylene Total Lead Fecal Coliform <br />' (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) (mg/L) (MPN/100 ml) <br /> MW-1 ND50 ND,0 ND,. ND,0 ND,. 0 067 C 2 <br /> MW-2 77 ND,,, ND,0 ND,0 ND,0 0 14 - <2 <br />' MW-3 NDS, ND,0 ND,0 ND,0 ND,, 0 073 C2 <br /> MW-4 ND50 ND,0 ND,0 ND,, ND,, 00053 2 <br /> MW-5 ND30 ND,0 ND,0 ND,, ND,, 0 012 C 2 <br /> MW-6 ND50 ND,0 ND,0 ND,0 ND,0 00082 C 2 <br /> MW-10 ND50 NA NA NA NA NA NA <br /> MW-11 ND50 NA NA NA NA NA NA <br /> ND = Non-detectable at the level of detection noted NA = Not analyzed <br /> 1 ' <br /> As shown on Table 1, the only hydrocarbon compounds found in the groundwater at the site <br />' during this quarter were TPH-G at 77 µglL in MW-2 This finding indicates that the trend <br /> toward improving groundwater quality is continuing at the site In particular, benzene, the only <br /> BTEX compound that has been historically found in significant concentrations at the site, is now <br /> non-detectable in all wells <br />' Regarding the results of the additional analyses scheduled only for the third quarter monitoring <br /> event, total lead was detected only at very low levels which are consistent with background <br /> levels in groundwater While unrelated to the underground storage tank project, fecal coliform <br />' at minimal detection levels was found in MW-4 <br /> Regarding the QA samples, good repeatability of the laboratory analysis was found between the <br /> field duplicate (MW-10) and the primary well sample (MW-3) as TPH-G concentrations were <br /> not detected in either sample The decontamination check sample (MW-11), collected after <br /> sampling MW-3, showed no detectable compounds present in field equipment after completion <br /> of a standard field decontamination procedure <br /> SCKIRPCSL4REG3QTR WP 4 0111214 <br /> 1 <br />