Are they spraying on a damproofing or applying a 60mil waterproofing membrane onto the concrete ? If so is the new coating bonding to the original coating ? Torch on non granular membrane meaning a base sheet as an option. Protecto wrap peel and stick has worked very effectively for me on some situations. Another option might be to "shingle wrap " some delta drain mat, then some birds eye gravel on top of the drain mat. This will protect the membrane during the back fill. Extra insurance so you can sleep at night. Chasing leaks is no fun.............fingers crossed that they get it for you.