G7 GEOTECH LIMITED

We're #hiring a new Ground Investigation Specialist Opportunity in Preston, England. Apply today or share this post with your network.

Hawkshead, Lake District, Ground Investigations in the Snow Big thank you to Boreworx Ltd for dynamic sampling and probing yesterday and today despite difficult conditions in the Lake District.

We were on site in Walsall recently and this photo shows Devensian Till ( Glacial Till ) derived from the Pennine Lower Coal Measures hence the fine gravel of coal in the sample. Also, following on from the photo of a couple of weeks ago taken of a trial pit in the Devensian Till on the West Lancashire Plain ( derived at least partially from the Triassic ) both these geographically disparate Tills seem to have sandstone gravel fully weathered to sand as inclusions / pockets. What do all you geologists think of this? Are these pockets of deposited sand or is it fully weathered gravel? #lovegeology

We recently undertook soakage testing by shallow excavation in Longtown, near Carlisle where the BGS mapping indicates Solway Esk River Terrace Deposits. The ground surface for this Terrace Deposit is generally described as up to 3.5m above the flood plain, but we seemed to be higher than that, possibly 7m or more. Directly below the topsoil, we found slightly gravelly, clayey silty fine to coarse sand to 1.00m depth overlying slightly silty sand and gravel. With the ground level being so far above the floodplain, the River Esk has cut down significantly here, so this may explain why there may not have been any typical upper zone of dominantly cohesive soils within the Terrace. This is good news for infiltration drainage as there appears to be highly permeable soils at shallow depth. #lovegeology

This is a trial pit we undertook to check for desiccated clay soils and enable an assessment for foundation design for a house on the West Lancashire Plain. This is high strength and very high strength Devensian Till - Diamicton and interesting the large pocket of coarse green sand. A water lain channel doesn't seem plausible, so may be a large boulder, weathered to sand ( there were fragments of green sandstone lithorelicts within it ). #lovegeology; #diggingholes

This is a site we helped Soil Consultants Ltd with a couple of weeks ago. Boreworx Ltd undertook the drilling on this wide level area, which initially had been identified for development with shallow low cost foundations. We found a variable wedge of Made Ground upfill of up to about 1.80m thickness underlain by natural weathered Northampton Sand, which included some loose and very loose zones. Alternative foundations options are now being considered.