Hydro G Final report - Kildare.ie

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Hydro-G FINAL REPORT drain (monitoring point 24) was also sampled and showed temperature of 8.34°C and electric EC of 651µS/cm suggesting water originating from surface runoff. With respect to total dissolved solids (TDS), these were found generally high at all terraces ~700- 1000 ppm and its distribution at different locations is similar to that of electric conductivities. pH Level All the sampling locations showed alkaline conditions ranging from 7.15 to 9.48 pH on the 10th of December 2007 and from 7.29 to 8.74 on the 16th of January 2008. In the Spa Well (monitoring point 9) the pH was recorded at 7.15 and 7.99 and was relatively low in comparison to other locations. Subsequently, lower pHs were also found in places linked to the underground discharge from the Spa Well (monitoring points 8 and 11), where they were measured at 7.27-7.75. The Royal Canal (monitoring point 10) sample showed pH of 8.25 and the ‘irony spring’ (monitoring point 7) 7.29. In the ‘filtering ponds’ (monitoring points 12-17) pH tended to exceed 8 on both occasions. Similar pH was found at the entrance to the Roman Bath (point 5) where it was measured at 8.52 and 8.32 respectively. Higher pH in places associated with cold springs supports the hypothesis that this water originates from the shallow system which is in contact with the alkaline bedrock. At lower terraces, the pH was generally higher, above 8. Chloride Results of the hydrochemical analysis show very high chloride levels in the majority of samples, which explains relatively high EC and TDS values measured in situ. The highest chloride levels (~350 mg/l Cl) were recorded at the Spa Well (monitoring point 9) and the discharge from the Spa Well (monitoring point 8). The high chloride level in the Spa Well was expected, following the literature review. Chloride concentrations decrease in a northerly direction. Samples from the bottom of the fourth terrace have Cl concentrations of ~ 260 mg/l Cl. This suggest that water collected at down gradient locations from the Spa Well represent mixing conditions of water coming from the Spa Well and from other sources (rainfall, surface runoff) that have lower chloride concentrations. Relatively low concentration of chloride was found in a sample taken from the Intel drain (monitoring point 24) and was found at 65.94 mg/l. This suggests that water gathered in the ditch collects the rainfall runoff rather than groundwater that could contribute to wetlands on the site. The high chloride concentrations within the study site, abnormal for Irish conditions, are associated with water coming from deeper, warmer rocks, where chloride dissolves from certain stratographies. Sodium and Potassium Sodium concentrations on the Leixlip Spa site range from 158-203 mg/l Na and followed similar pattern to that presented by chloride, i.e. the highest concentration was found in the Spa Well (monitoring point 9) and these decrease along the south-north gradient. The Intel drain had lowest sodium concentration (35 mg/l Na) which suggests that water in the Intel drain does not come from the Leixlip Spa site. Potassium concentrations were relatively stable across the Leixlip Spa site (7-10 mg/l K). Significantly lower concentration of potassium was found in the Intel drain (monitoring point 24, 2.8mg/l K). Calcium and Magnesium Calcium and magnesium concentrations were generally similar across the whole Leixlip Spa site. The magnesium concentration was significantly lower in the Intel drain (monitoring point 24) with comparison to other sampling points. Project No.: 07_136 -29- Leixlip Spa
Hydro-G FINAL REPORT Iron Iron concentrations varied throughout the site. An exceptionally high level of 20740 µg/l Fe was recorded in the wetland area (centre of the Lower Pond, monitoring point 16). Historical data (Meagher, 1976; Matthews, 2007) suggest high iron concentrations in the Spa Well water. Other elevated iron concentrations were found in the discharge from the Spa Well (monitoring point 8 - 830µg/l Fe), above the Upper Pond (monitoring point 11 - 1450 µg/l Fe) and the bedrock face (monitoring point 3 -270µg/l Fe). The iron concentration in the Spa Well was found to be 150µg/l. Big differences in iron concentrations across the site are not well understood at this stage of the investigation. Project No.: 07_136 -30- Leixlip Spa
Page 1 and 2: HYDROLOGICAL REPORT FOR LEIXLIP SPA
Page 3 and 4: Hydro-G FINAL REPORT PROJECT TEAM D
Page 5 and 6: Hydro-G FINAL REPORT the Intel boun
Page 7 and 8: Hydro-G FINAL REPORT LIST OF FIGURE
Page 9 and 10: Hydro-G FINAL REPORT The issues to
Page 11 and 12: Hydro-G FINAL REPORT 2. Desk Study
Page 13 and 14: Hydro-G FINAL REPORT Hydrochemistry
Page 15 and 16: Hydro-G FINAL REPORT 1983 2008 Phot
Page 17 and 18: Hydro-G FINAL REPORT The general fl
Page 19 and 20: Hydro-G FINAL REPORT concentrations
Page 21 and 22: Hydro-G FINAL REPORT There are two
Page 23 and 24: Hydro-G FINAL REPORT suggests that
Page 25 and 26: Hydro-G FINAL REPORT FIGURES Projec
Page 27 and 28: Hydro-G FINAL REPORT 5 km Site Loca
Page 29 and 30: Hydro-G FINAL REPORT Figure 4 Site
Page 31 and 32: Hydro-G FINAL REPORT Appendix A Lei
Page 33 and 34: Hydro-G FINAL REPORT • Deteriorat
Page 35: Hydro-G FINAL REPORT Temperature, E
Page 39 and 40: Hydro-G FINAL REPORT Table 4 Result
Page 41 and 42: Hydro-G FINAL REPORT Project No.: 0
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Hydro G Final report - Kildare.ie

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