It might be relevant to find out which type of asbestos is buried there, not all are as dangerous as blue asbestos. It seems a tradition for the WTBTS to build on toxic dumps. Very fitting I think.
BTW,
Chelmsford in the county of Essex (the land of the east Saxons) came to prominence as a Roman town called Caesaromagus. (Ceaser's market)
The word 'temple' in English place-names often refers to the presence of a Roman temple, the remains of which being found on the site. And this is the case here, where an octagonal Romano-Celtic temple once stood in late Roman times.