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So they are covering soil with clay?
No. Natural soils (only) generated form the portal excavation, will be used to remodel the
golf course.https://planning.hillingdon.gov.uk/OcellaWeb/showDocuments?reference=10737/APP/2020/3359&module=pl has more
The planning consent requires a soil management plan which might have even more detail but I can't find that. Might not have been submitted yet.
The former Ruislip (municipal) golf course has its own conveyor system from the tunnel boring machine portal just to the west of West Ruislip station.
The excavated spoil is being dumped on former grazing land. The new level will be 4-5m higher.