Building Partnership's Rackeath eco-community website has a chapter in the first part of the Concept Statement which is headed Baseline Conditions. Paragraphs 4.49 to 4.53 cover the issues of ground contamination and unexploded ordnance but whilst admitting the possibility of the existence of both the general tone suggests that neither would be a problem.
However, an account by a USAF officer tells of a bombing mission to Royan in France where jellied-gasoline (napalm) was dropped (the first time in Europe by B24s). He goes on to say that the napalm containers had no ballistic characteristics whatsoever. They were made of heavy cardboard, and at altitude some of the detonators popped out like loose corks. These bombs were stored at Rackheath.
After the American 467th Bombardment Group left Rackheath 231 Maintenance Unit of the 42 Group Royal Air Force arrived at the site and from July 1945 this group was responsible for the storage and maintenance of explosives. Several thousand tons of bombs ranging from 250lbs to 4,000lb were stacked on both sides of the main runway and armouers would spend time de-rusting and then greasing the bombs to enable them to withstand further storage along the runway. When the high explosive bombs reached a certain age they were usually shipped out by rail from a track spur at Salhouse Station.
In the late sixties the Maintenance Unit finally left Rackheath.
The eco-community website says that there is no anecdotal evidence of unexploded ordnance and yet a number of local people have found unexploded shells on the site and the fact that napalm containers were stored there suggests that further investigation is vital.