Hydro G Final report - Kildare.ie

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Hydro-G FINAL REPORT Appendix B Leixlip Spa - Hydrochemical Analysis Source: Hydro-G, 2007/2008 and Complete Laboratory Solutions, Ros Muc, Co. Galway Project No.: 07_136 -27- Leixlip Spa
Hydro-G FINAL REPORT Temperature, Electric Conductivity and Total Dissolved Solids It is evident that water temperatures decrease from the south to north direction, as does the electric conductivity. The highest temperatures and ECs were recorded in the Spa Well (monitoring point 9, T=13.5-15°C, EC = 1900-2000 µS/cm) and in the outflow from the underground drain (monitoring point 8). In the small ‘irony spring’ (monitoring point 7) both water temperature and EC were recorded at much lower levels (T = 8-10 °C, EC=~750 µS/cm), which were comparable with the Royal Canal conditions (monitoring point 10; T=5.9°C and EC= 617µS/cm; 10/12/2007) and as such suggest leakage from the canal. In the next, further down gradient, location in vicinity of the ‘filtering ponds’ temperatures and ECs varied spatially across relatively small distances and were highest in central points in both ponds and lower at more outer locations. It was also noted that both the temperature and EC were higher in the Upper Pond than in the Lower and that EC measured in the Lower Pond on the second occasion were significantly lower than the first time in December. The depth of water in these ponds was investigated to reveal that both ponds are relatively shallow with 0.45m depth in the Upper Pond and 0.25m in the Lower Pond. Field investigations suggest that these ponds are underlain directly with bedrock. Lower temperature and EC in localised places suggest multiple sources of water at these locations, i.e cold springs which mix with warmer water coming from the Spa Well. These cold springs are likely to originate in the shallow system which is expected to be cooler and less mineralised in comparison to water discharging from the deeper system at the Spa Well. Abundance of calcite precipitated in this area and specifically around the Lower Pond (monitoring point 18) suggests that groundwater discharges at this location. Integration of field data suggests that while the Upper Pond is fed by the Spa Well, the Lower Pond also has inputs from the shallow groundwater system. Monitoring results down gradient of the ‘filtering ponds’ show temperatures at approximate level of 8-9 °C and EC at around 1750-1850 µS/cm (lower than in the Spa Well by ~5 °C and ~200 µS/cm). Water flow on the second terrace is by flow along the ground surface. This prevented monitoring of physio-chemical parameters. There is an abundance of ad hoc streams wherever topography allows. Large depositions of calcite were noted where water drops from the first terrace into the second terrace. Increased flow velocities and more dispersed nature of flow increases the release of the CO2 from the water, which facilitates higher calcite precipitation rates in this location. At the third terrace, there was an abundance of water flow and sources. It is likely that not all discharge points were identified. Water was noted to enter from both overland flow and also from various sources directly in the ground and bedrock face. Discharge from the bedrock face at the eastern side of the terrace (monitoring point 3) had relatively low temperatures (7-8 °C) and high EC values at ~ 1600µS/cm. Some deposition of iron was also noted in the opening in the bedrock, suggesting high iron content in water. Two other small outflows from the base of the bedrock were also noted; one in a shallow pool of water where distinct pieces of tufa are present (‘tufa pond’, monitoring point 22) and the second 1m above this pool (too shallow to measure physio-chemistry). Physio-chemical characteristics of the ‘tufa pond’ were: T at 6.3 - 8.3°C and EC at ~1480 µS/cm. There were two sampling points on the fourth terrace; one on the west side (monitoring point 1) and one at the east side (monitoring point 2). On the east side, water forms a stream of 0.15m width and 0.05m depth and the flow is relatively fast. Deposits of tufa are present in the bed of the stream. Measured temperatures were 5.5 - 6.8°C on the west side and 6.6 - 6.9°C on the east side. Electric conductivity averaged 1550 µS/cm. The drain on the Intel site at the western boundary of the Leixlip Spa site contains water at its northern end only, which finishes at the approximate elevation of the Roman Bath. Water in this Project No.: 07_136 -28- 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: Hydro-G FINAL REPORT • Deteriorat
Page 37 and 38: Hydro-G FINAL REPORT Iron Iron conc
Page 39 and 40: Hydro-G FINAL REPORT Table 4 Result
Page 41 and 42: Hydro-G FINAL REPORT Project No.: 0
Page 47: Hydro-G FINAL REPORT Project No.: 0

Hydro G Final report - Kildare.ie

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