TENDER VALUE: £60K
CONTRACT: SEATHWAITE TARN IMPOUNDMENT RESERVOIR
CLIENT: UNITED UTILITIES
The site was situated in a remote location on high ground, with The Old Man of Coniston summit situated just 1500m to the east. A meandering steep access track linked the nearest road to the reservoir location. With respect to access, only 4WD vehicles (e.g. Landrover, Ford Ranger etc.) were suitable throughout the works.
The investigations encompassed the advancement of ten rotary drillholes in an extremely remote location within the Lake District Park, Cumbria. Eight rotary drillholes (in two arrays of four holes) were drilled at various inclinations (between 30o and 70o) into the face of the dam impoundment structure (concrete) in order to install vibrating wire piezometer (VWP) instruments. The remaining two drillholes were positioned downstream from the dam and were instrumented with traditional casagrande type piezometers.
Twelve heavy duty VWP were installed (in two arrays of six) within the dam concrete and immediate sub-
Particular constraints included no mobile or fixed telephone services -
EXPERTISE FOCUS: Specialist installations on a dam site