Borehole made at 50 Westferry Road in 2007.
Shows made ground covering 1.50 metres clay and silt.
Below this is 2.40 metres of brown peat.

This indicates that in a drier warmer period 6,000 to 3,000 years before present the area was forested. after this time the weather became cooler and wetter and the area was probably under water and being covered by silt. (Late Holocene rise in sea level)

More recently (2009) boreholes have been made in Mudchute Park and showed high levels of arsenic and lead were present.