How should you store debris metal until it is collected?

Short answer: Stack it in one place away from buildings, power lines, drains and children, sorted by type with sharp edges covered or folded in, keep hazardous or suspect items such as possible asbestos, gas bottles and fuel containers well apart and clearly marked, and keep access clear for the collection vehicle, because a tidy, safe pile is quicker to collect and less likely to cause injuries while it waits.