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摘要

An apparatus for waterproofing an outdoor fluid containment area utilizing a flexible plastic sheet (12) for providing a water barrier: provides a means for readily detecting the presence of holes in the plastic material. The sheet (12) includes a plastic layer (24) which is rendered electrically conductive by embedding conductive particles within it. The integrity of the sheet may then be monitored by establishing an electric field across the sheet and monitoring for sparks between the conductive plastic layer and a probe (32). Reliable and economical testing is possible, even in situations where electrical leak testing was not previously feasible.