Another Brick Pit Hole at Hemel Hempstead?

The sink hole in High Street Green, Hemel Hempstead, 2017

Oatridge Gardens, 2014

Two years ago I gave a posted "Forgotten" St Albans Brick Pit Rediscovered, followed a year later by What lies under Bernards Heath - and posted the slides of my talk "Brick Pits and other old holes" on the main web site. 

The notes for the talk also included brief details of another hole that appeared in Oatridge Gardens, Hemel Hempstead,  in 2014. which was also due to building on the site of a former brick pit which had been infilled - almost certainly with local town rubbish. See Hemel Hempstead sinkhole ‘may have been caused by building homes on former clay pit’ and Sinkhole latest: Landlord defends decision to build Hemel Hempstead homes on former clay pit. The later reference included the following

A life-long Hemel Hempstead householder has fuelled speculation that the sinkhole near his home may have been caused by building on former clay pits and chalk mines. Noel Swinford, 78, said they lined Wood Lane End between its junction with Briery Way, where he now lives, and Maylands Avenue. He said he used to play in them as a child. He said: “There must have been 50 or 60 of them holes along that road and them houses should never have been built there. “There were also big mines underneath there, where they mined the chalk. “I have lived here all my life, for 79 years nearly, and used to play in that area when I was a kid. I remember seeing trucks of chalk being taken out of the mines – that would have been in the late 1940s. “It was not an operational brickworks then – it was just used for taking out chalk.”

Another hole, 14 metres deep, appeared in nearby High Street Green in May this year and current estimated suggest that the road may be closed for about 5 months - Sinkhole in Hemel Hempstead may leave road shut for another two month. The new hole is in the road north of the Saracen's Head on the 1897 OS map, while Oatridge Gardens is in the area of the brickworks shown to the east of the Saracens Head. The depth of the hole suggest that, like some of the other collapses, the problem could be due to a very deep well or a shaft into a chalk mine.

See also The Leverstock Green Brickfields

What lies underneath Bernards Heath, St Albans

The area of the Fontmell Close as it was in about 1900

I gave my talk "Brick Pits and other old holes" to the St Albans & District Local History Network Annual Conference yesterday, discribing the reasons people had duh holes in Bernards Heath  and the talk is now online at "HOLES"

Some of the slides have details supplementary notes and I had planned to add more today - but have picked up a cold which has gone to my chest (I have asthma) so I decided that plenty of fresh air was better for me than spending hours at the computer. I hope to add the missing notes over the next week or so.

IMPORTANT UPDATE

Following a note from Roger I have looked at my records of William Bennett, who made bricks on the site now occupied by Fontmell Close. William also had brickworks at Harpenden and Hemel Hempstead - and there appears to have been a chalk mine on site at Harpenden and a deep well on site at Hemel Hempstead. As he had lime kilns on Bernards Heath je almost certainly had a similar chalk mine and/or deep well. Failure of the capping of a shaft into a significant chalk mine could easily explain the rather large hole in the road. I have added details to the relevant page of the online text of the talk.