In levelling my garden, I have shifted one load of soil from the main area, to the back - which, having previously been a slope, is now encased by four walls. The reason for encasing it in the four walls, was to allow us to level the main area, and dump any leftover soil there to bring it up slightly higher - although not level with the main garden, we can now level this out and make it a useable space. We are installing and compacting sub base + granite dust on the main area for artificial grass this week, but was wondering if it was worth using any leftover to compact the back area too? Or does the soil at the back need time to settle first? If we can compact the back, how soon after laying the sub base do we have to decide what we are doing with it (e.g. simply laying with gravel or decking or something else etc). Thanks in advance!