Robin,
I’ve designed and constructed 4 golf courses in Switzerland where International Gas Pipe Lines were present.
The most intimate contact was with the Transgas that transports North Sea Gas from the Netherlands as far as Itlay, transversing Switzerland through Tunnels and up and down valleys. On my particular course, G.C. Source du Rhône in Obergesteln, Valais the Transgas were upgrading from a 60 cm diameter pipe to 120cm diameter pipe.
Our experience negotiating with Transgas was very positive, as they were extremely flexible and interested in getting their permits and accesses as swiftly as possible, to avoid delays. As a result compromises and deals were struck quite quickly, mainly monetary!!!
The gas pipes usually were buried to to a depth (top of pipe) of 4.00m under the normal terrain.
We weren’t allowed more than 2.00m overburden over the gas pipe
Heavy machinery (Lorries) had to bridge the pipe trace with timber mattresses
Our irrigation lines could cross their gas pipe lines, but was not allowed to come closer then 2.00m to their gas pipe.
In the end our golf course, which was constructed simultaneously with the Transgas Project, had 4 Greens and 2 Tees placed directly over the Gas Pipe Line, as it was the ideal place for the golf layout, and the Transgas had no objection.
We managed some useful synergy sharing some construction machines, and utilizing their excavation material.
If you have any specific questions just IM me.
John