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Quarterly Journal of Engineering Geology and Hydrogeology
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Quarterly Journal of Engineering Geology and Hydrogeology; 1989; v. 22; issue.2; p. 139-144;
DOI: 10.1144/GSL.QJEG.1989.022.02.05
© 1989 Geological Society of London

Article

The examination of encrustations in an unlined borehole using the sidewall sampling technique

P. Howsam1,, F. C. Brassington2 & P. A. Lucey2

1 Department of Agricultural Water Management, Silsoe Campus, Cranfield Institute of Technology, , Bedford MK45 4DT, UK.
2 North West Water, Planning Department, , PO Box 12, New Town House, Buttermarket Street, Warrington WA1 2QG, UK.

In borehole rehabilitation, engineers usually have limited access to information about the borehole condition and the processes involved. This paper describes the use of the sidewall sampling technique to gain information about some manganese encrustations which are considered to be adversely affecting the yield of a large-diameter, unlined, Triassic sandstone borehole in NW England. Trials with the technique proved successful and suggest that it is worth considering in any rehabilitation feasibility or implementation projects in which similar conditions prevail.