I’ve been been involved in preliminary discussions about the feasibility of redeveloping a former sewage works for residential housing. The site is approximately 7.7 ha in area and is currently open space. Investigations have revealed that a layer of sewage sludge approximately 2-3 metres thick is present across the majority of the site which is generating significant amounts of gas. I'm aware that similar sites have been remediated by stabilising the sludge with lime cement, in order render it geotechnicaly suitable and to reduce gassing potential. I would be interested to know if anyone has experience of reclaiming such a site, whether stabilisation is feasible, and what ball park treatment costs would be.
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