However, opponents of the cull insist it is "biologically impossible" for goats to multiply at such a high rate.
It prompted the Food Standards Agency to urge anyone consuming food grown in nearby allotments to wash and peel the items first.In a statement, Wyre Council said: "Everyone in the country is exposed to very low levels of PFOA due to their diet.
"Based on current information, local residents who regularly eat large amounts of vegetables and fruits grown in allotments and gardens could be increasing their exposure."These samples confirm PFOA is present at a level which indicates that more detailed testing is now required."It added that because the investigation was complex it was likely to be "a fairly length process".
Wyre Council said ICI, and subsequent site owner AGC Chemicals, were permitted to use PFOA from the 1950s to 2012.The substance was used in everyday items like non-stick pans and waterproof clothing.
Some were sitting outside, taking in the warm night air. Others were reading by torchlight.
Rough sleeping is on the rise across England but the"The installation of the viewing platform formed part of these accessibility improvements," Mr Jackson said.
He added that the structure was "intended to help everyone to experience this wonderful protected landscape".The Hole of Horcum is part of the Levisham Beck valley, in the Tabular Hills of the North York Moors National Park.
The hole was created as a result of spring-sapping - where water wells up from the hillside and gradually undermines the slopes.This process leads to erosion and means the hole still widens and deepens to this day.