Shortening my cleanout by about 3 feet

[Steven Wojcio]

Hey everyone! First time posting here. Apologies if this is a dumb question. I've attached two pictures of what I'm pretty sure is my sewer cleanout in my backyard. I'm planning on putting up a retaining wall that will put the cleanout on the second tier of my yard. My plan is to just shorten the cleanout by about 3 feet, but I want to make sure that would be ok. I've dug 4 feet down so far and I haven't hit a horizontal pipe. The questions/concerns I have:
- Is there a depth requirement on the horizontal pipe that this connects with?
- Will the horizontal pipe that this connects with be ok with me building a 4 ft retaining wall above it?
- Is there a height requirement on cleanouts?

I live in Mill Creek, Washington State (Snohomish County) in case anyone knows code for my area.

Thanks!!

 

[Terry]

I don't believe there is a height requirement on cleanouts. Sometimes that are just mapped out and buried. It's real nice when you have access to them though.

Bothell, WA

 

[Sponsor]

 

[Steven Wojcio]

Thanks for the response Terry - Looks like you're in the same town as me. I spoke with my usual plumber and he seemed ok with my plan too. Here goes nothing!