These documents may be easier to read here – http://www.sheilaoliver.org/contamination.html

The document above is from 20th September 1974 and states the site had been intensively tipped for the previous 20 years, so going back to the 1950s. During this time there was no control over what was dumped.

This document below is refusal of planning permission – J89 – “The land is tipped and unsuitable for building.”