Dousing of a hot spot has been undertaken from relatively shallow installations,
approximately 5m in depth, installed at close centres above the suspected core of the hot spot. Liquid is then fed into the shallow installations to saturate the waste. The success of this technique depends on the depth of the hot spot and the pathways taken by the liquid as it passes through the waste mass. This technique can be considered for relatively shallow hot spots. For deeper hot spots, the closer the liquid injection point is to the core of the hot spot, the greater the chance of success, as discussed in the case study below. Other injection points such as in-waste horizontal gas collection pipes have been successfully used to extinguish known hot spots, or, at least, bring them under control.