I have a 4" PVC septic pipe leaving my house on the cinder block wall about 4 feet below my house. There was a crack inside of the part where it leaves the house and I need to replace it (from settling/35 years old). I am going to do the digging and replacing of the soil myself, but was wondering what was recommended for backfilling? Right now the dirt is a sandy/clay like substance with random bricks and rocks in it. I was wondering if it is okay to use the same dirt to backfill or if I should use pea gravel (or something else) around the PVC pipe whenever I backfill the soil. This will be an area about 5 feet long and 5 feet wide. The pipe will go into the house (so backfilling around pipe and next to my house).
Thank you in advance for your help!