Hydro G Final report - Kildare.ie

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Hydro-G FINAL REPORT Moorkens explained recent problems with Vertigo angustior habitat in the lowest terrace i.e. at the Rye River floodplain. The increasing density of grasses over the past years suggests that the site undergoes a drying trend. It has also been noted that the ground level increased due to accumulation of organic matter. The entire Leixlip Spa site was surveyed for springs and seepages and physio-chemical characteristics were measured. In total, 23 locations were surveyed. Water samples were collected from 10 no. locations. However, problems with the ionic balances obtained negated use of the initial laboratory results. During the third site visit, undertaken on the 16 th of January 2008, the in situ physio-chemical survey of springs and seepages was repeated to compare with December’s results and 8 no. water samples taken from selected locations. These were delivered to an accredited laboratory for hydrochemical analysis. Flow measurements were conducted to assess flow patterns within the site. 1.2.3. Reporting A preliminary report was provided in December 2007 (Appendix A). This report presents the integrated assessment of the site’s hydrology, hydrochemistry and the emerging conceptual hydrological model for the Leixlip Spa site. Project No.: 07_136 -3- Leixlip Spa
Hydro-G FINAL REPORT 2. Desk Study 2.1. Environmental Settings The Leixlip Spa site is located on the Leixlip-Maynooth local road R148, approximately 2km west of the Leixlip town centre. The R148 constitutes the site’s southern boundary and an access to the site is also provided from this road. The site is adjacent to the Intel Ireland factory, which is to the west, and the eastern boundary runs along the Royal Canal. To the north, the site is bounded by the river Rye Water. The site location map is presented in Figure 1. 2.1.1. Geological Settings The bedrock geology underlying the site is discussed in the GSI publication “Geology of Kildare - Wicklow, (McConnel et al., 1994). The 1:100,000 scale bedrock geology map for the area (Sheet 16) indicates that the subject site is underlain entirely by rocks of Calp Limestone Formation (CD), which was formed during Chadian age and belongs to Lower Carboniferous system (refer to Figure 2). During the Carboniferous period, the eastern part of Ireland underwent uplift and erosion after which there was a period of subsidence in the area. Throughout this time, the sea invaded the land allowing marine sediments to accumulate across most of the Sheet 16 map, including Leixlip. The Calp Limestone is a muddy limestone and was deposited in thick sequences in turns with muds in deep sea basins with a limited fauna. It consists of dark grey, fine grained, graded limestone with interbedded black, poorly fossiliferous shales. In later periods, subsequent erosions reworked the upper end of the Calp and overlying younger limestone deposits allowing for localized karstification (in places where the rock was temporarily exposed) and/or for deposition of granite boulders within the Calp. There are number of faults in this area. These are predominantly in an east-west direction. One of these faults runs in close proximity to the site, along it’s southern boundary, Figure 2. With respect to overlying strata, the majority of this area is covered by till of sea origin and derived from limestone and overlain with Grey Brown Podzolics and Gleys (Gardiner, 1980). The GSI (GSI, 2007) reports these deposits to be less than 3m deep west of Lucan village and the groundwater vulnerability rating, which classifies this area as ‘high’ vulnerability, suggests depths to bedrock of approximately 3 - 5m. 2.2. Hydrogeology 2.2.1. Aquifer Characteristics According to the GSI Groundwater Body description (GSI, 2007), the Leixlip Spa Site is underlain by the Dublin Groundwater Body, which generally is low permeability and the majority of groundwater flow occurs along faults where permeability is increased by dolomitisation of the rock. The majority of flow occurs close to the surface and in isolated fractures at depths of up to 50m below ground level (bgl). Relatively low permeabilities deem this bedrock to be of limited development potential and therefore the Geological Survey of Ireland classified it as Locally Important aquifer, with moderate potential in local zones only. Groundwater yield potential is therefore highly dependent on Project No.: 07_136 -4- Leixlip Spa
Page 1 and 2: HYDROLOGICAL REPORT FOR LEIXLIP SPA
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Hydro G Final report - Kildare.ie

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