backfill

I am running a new sewer line in my front yard. I've trenched 60' and now need to add some bedding material for the 4" pipe. Locally I can get sand, gravel, decomposed granite, pea gravel, and road base. Any reason to use one over the other? The existing soil is 4-5 inches of top soil...

Hi , I had a section of sewer line replaced in the front yard, directly beside the house foundation. The depth is about 10 feet. I'm responsible for backfilling the hole, and I'm trying to determine the type of material to use. I've read recommendations for sand, gravel or soil, and I'm not sure...

I cut my basement slab (4 inch slab) open and roughed in a new bathroom (toilet, lav, and shower) and also basement bar. I tied into the existing PVC under slab for all work. I filled under all of the new lines with pea gravel up to the springline of the pipe and then backfilled from there with...

Additional plumbing (all cast iron) was installed in above grade concrete slab. The trench is about 5" deep and 12"x14" (see pic). The slab itself is about 8" thick reinforced concrete. Can I just re-pour concrete over it or should we backfill the space around the pipes with something first...