While re-seeding some small areas in fairways where the turf is weak we often times (not always) encounter rock just below the surface. Here are pictures from the 1st fairway:
Our staff will take a pic and try and remove the top 3-4 inches of the rock and replace with soil. During drought and heat the rock heats up and the plants are unable to survive. By giving us a little bit more rootzone to work with we hope the turf will be more successful.