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Geology and hydrogeology ... …

Report No. SRL/FP/004.1 (10/05/2006)

Of course neither is satisfactory and it would probably be best to store the PFA in a manner that does not result in the containing barrier being persistently exposed to polluted w a t e r . A b o v e - g r o u n d s t o r a g e o f t h e P F A w o u l d s e e m t o o f f e r t h i s a d v a n t a g e , p r o v i d e d t h e base of the mound is protected from wicking of water from the ground beneath. 2 3

ON THE SCIENTIFIC VALIDITY OF NPOWER’S FLOOD RISK ASSESSMENT Review of Appendix 7A: Flood Risk Assessment

This section lists a series of quotations, full or partial, from the Appendix 7 of the ES. Comments on these statements are typically brief and sometimes with irony, because this Appendix of the RWE npower ES is written so unprofessionally that it is not worth the paper it is printed on. There is not time, nor should there be a need, to develop rigorous arguments against the many fatuous statements made by RWE npower. If ironic remarks are made by me, and not easily understood by the reader, please refer to the detailed reference, given by page number, wherein the weakness of the logic used by Npower and Jacobs will become immediately apparent. Particularly important points, wrongly used by npower to support their case, are emboldened.

Page 2-3

“The invert of this overflow pipe at Lake E is understood to be approximately 52.2mAODN”.

Understood by whom and with what authority? Do they know the invert height or not?

On Kimmeridge Clay

“The thickness of this formation is considered to be approximately 30m”.

Why? I show it to be a few metres thick at most in North Abingdon, just two kilometres from Lake E. It must suit npower’s purpose to present this fiction, as discussed by me earlier in this report.

On the Corallian formation:

“the thickness at Radley is not known but elsewhere can be up to 100m.”

What has that got to do with it? Radley is not elsewhere. In other elsewheres the Corallian does not even appear. But in north Abingdon it is known to be only a few metres thick. There must be many other measurements better than an allusion to great thickness, probably unrelated to Radley. For example Npower is referred to the drillers of the extensive number of licensed boreholes that are tabulated in Appendix 7 of the RWE npower Environmental Statement.

23 Riggs R, Crowley B J B and Kemp I C, PFA from Didcot Power Station A Summary of Alternative Options for its Disposal, Save

Radley Lakes Report SRL/PFA/001.1( March 2006).

Page 15 of 23

© SAVE RADLEY LAKES 2006

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