Sewer & Water Resources

McLaughlin Group has a great website with plenty of resources & videos:

Interesting article on the black seal coating applied to water main ductile iron pipe:

https://www.mcwaneductile.com/blog/what-is-the-purpose-of-the-seal-coat-on-ductile-iron-pipe/#:~:text=Historically%2C%20cast-iron%20pipes%20and,pipe%20in%20its%20buried%20environments