Geology and hydrogeology ... …
Report No. SRL/FP/004.1 (10/05/2006)
LEACHING FROM EXISTING DISPOSAL AREAS Evidence of leaching from lakes H/I
This will not be discussed at length because it has been discussed elsewhere by R Eeles4. He has examined borehole samples over a period of time and deduced that toxins leaching from Lakes H/I can be the only explanation of high readings of heavy metals and other dangerous substances at these boreholes.
My evidence is far simpler. My wife and I walked along the path which skirts the northeast flank of Lake M recently. When we turned to the south and skirted the Eastern end of Orchard Pool (Lake M) we came to cross a small stream (Bruney Water). It was strikingly noticeable that the stream exhibited various signs of pollution. There were characteristic growths of anaerobic species on the surface of the water. This was in winter, and should be contrasted with anaerobic growths (blue-green algae), which appear on lakes and ponds in summer, when oxygenation of water is low. It occurs particularly in the presence of run-off from fertilisers in fields. But the region near Lake M has not received fertiliser for decades.
The stream also exhibited brown stains, characteristic of iron pollution. In addition there were oily films on the surface, possibly of biological origin. My wife, a biochemist and plant specialist, who has spent part of her career working at the Department of Plant Sciences in Oxford, immediately identified the signs of pollution in Bruney Water the south of lake M (also lying to the south of lakes H/I) and was convinced that a serious problem existed. She recognised the strong possibility that it was linked to the bunded lakes H/I. She drew this conclusion before she became aware of the work on borehole logging and contamination by Dr Eeles. A further observation of ecological damage to this stream has been identified by Dr D Guyoncourt18. He has observed the tell-tale signs of iron in the water in this stream not only to the south of Lakes H/I and M, but also further along the same stream as it flows towards Barton Fields. His observation is that the staining only appeared during the last few years, roughly since Lakes H/I started to be filled. Dr Eeles refers to this staining, in his report4, as being due to anoxic decay of peat due to waterlogging resulting from bunding. The iron could be iron sulfides, which are toxic. The situation would be exacerbated in the presence of any sulphate leaching out of H/I.
The inescapable conclusion is that the sealing of Lakes H/I provided by the bund of Kimmeridge Clay is ineffective. It would be wrong to allow the construction of a newly bunded lake until the leaching from Lakes H/I is properly understood.
What has been done by RWE npower in relation to leaching from Lakes H/I?
Appendix 7 of the Environmental Statement contains the Flood Risk Assessment report written for Lakes E and F. RWE npower did not even bother to rewrite it for their present application to fill Lake E only. This Appendix discusses flow of groundwater and borehole
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© SAVE RADLEY LAKES 2006