At the substation, there are two long precast concrete trenches: one 19 meters metres long with a span of 765 mm, the other 25 meters metres long with a span of 1250 mm. The trenches are set flush into the ground, with an edging created using upright concrete slabs. The trenches required a covering solution that could be easily manually removed for maintenance and monitoring while performing at D400 load rating (40 ton). tonne). The Substation specified a FRP GRP composite solution to meet the required specifications. Covers also needed to provide a safe walking surface for operators, whatever the weather conditions.

Stanton Bonna, the precast trench manufacturer partnered with Fibrelite to create a series of custom FRP GRP trench covers to fit onto their precast concrete trenches.