Superficial deposits are absent although mounds of Pleistocene till are recorded both N and S of the cutting. 4.0 Defects of Concern: At GU-028-P0000 is a crest parallel open drain ditch that has recently been excavated and an attempt made at cutting through the upper crest to drain water from the field down the face of the cutting. The landowner should be made aware of the inadvisability of discharging surface water onto the face of the cutting, particularly as this is immediately above an old slip on the lower face. The historic slips on the face should be visually monitored for evidence of remobilisation. Should this occur it is possible that the slips could cause local obstructions in the canal although it is unlikely that a total blockage would occur 5.0 Geotechnical Assessment / Stability: The and middle cutting is formed in benched sandstone and is likely to remain stable in the long term. However the geology of the cutting is such that groundwater will penetrate through the upper sandstone rock mass and along minor joints before meeting the upper surface of the underlying impermeable marl. Water will then discharge through the cutting face. It is unlikely that this could be prevented without significant drainage works. It is therefore likely that in the medium to long term minor slips will affect the face 6.0 100m Length Sub-Asset Grades Summary Table Condition C 4m high CoF 1 Rough pasture Serv. 1. – – with local face issues GU-027-P0600 Condition D 5m high CoF 1 Arable Serv. 1. – – with minor slips GU-027-P0700 Condition C 6m high CoF 1 Arable Serv. 1. – – with drain and minor slips GU-027-P0800 Condition D 12m high CoF 1 Arable Serv. 1. – – with spoil mound and badger setts Condition C Vertical CoF 1 Arable Serv. 1. – – sandstone and stable slopes GU-028-P0000 Condition D Major CoF 1 Arable Serv. 1. – – historic face slip GU-028-P0100 Condition D 2 No. CoF 1 Arable Serv. 1. – – historic face slips 7.0 Recommendations Discuss with landowner recent excavation of crest ditch and possible discharge of drainage onto cutting slope. Monitor lower slope for evidence of remobilisation or new slips. If detected geotechnical advice should be sought
Superficial deposits are absent although mounds of Pleistocene till are recorded both N and S of the cutting. 4.0 Defects of Concern: At GU-028-P0000 is a crest parallel open drain ditch that has recently been excavated and an attempt made at cutting through the upper crest to drain water from the field down the face of the cutting. The landowner should be made aware of the inadvisability of discharging surface water onto the face of the cutting, particularly as this is immediately above an old slip on the lower face. The historic slips on the face should be visually monitored for evidence of remobilisation. Should this occur it is possible that the slips could cause local obstructions in the canal although it is unlikely that a total blockage would occur 5.0 Geotechnical Assessment / Stability: The and middle cutting is formed in benched sandstone and is likely to remain stable in the long term. However the geology of the cutting is such that groundwater will penetrate through the upper sandstone rock mass and along minor joints before meeting the upper surface of the underlying impermeable marl. Water will then discharge through the cutting face. It is unlikely that this could be prevented without significant drainage works. It is therefore likely that in the medium to long term minor slips will affect the face 6.0 100m Length Sub-Asset Grades Summary Table Condition C – 4m high with local face issues CoF 1 – Rough pasture Serv. 1. GU-027-P0600 Condition D – 5m high with minor slips CoF 1 – Arable Serv. 1. GU-027-P0700 Condition C – 6m high with drain and minor slips CoF 1 – Arable Serv. 1. GU-027-P0800 Condition D – 12m high with spoil mound and badger setts CoF 1 – Arable Serv. 1. Condition C – Vertical sandstone and stable slopes CoF 1 – Arable Serv. 1. GU-028-P0000 Condition D – Major historic face slip CoF 1 – Arable Serv. 1. GU-028-P0100 Condition D – 2 No. historic face slips CoF 1 – Arable Serv. 1. 7.0 Recommendations Discuss with landowner recent excavation of crest ditch and possible discharge of drainage onto cutting slope. Monitor lower slope for evidence of remobilisation or new slips. If detected geotechnical advice should be sought
2011%20Principal%20Inspection.docx