Dear Tech Abby:  Do I have to use a crushed stone backfill for my PVC sewer pipe installation?  --That 70’s EngineerDear That 70’s Engineer:  Good question… the

After WWII and the Korean War there was an explosion of residential and commercial building along with sanitary sewer across our country.  With all the new building construction, there was a desire to find a more reliable sanitary sewer product than Vitrified Clay Pipe and Reinforced Concrete Pipe.  

Every sewer has them… every few hundred feet… you can’t avoid it if you are in the sewer industry... Got a guess?... That’s it… MANHOLES. Ahh yes, the beautiful