Hello, I'm installing a urinal, and I need to tie into the main line. Work is being done in Los Angeles CA. Question? is cast iron mandatory below grade? or can I use ABS for the tie-in? I plan to tie-in a sweep tee under grade, add a clean-out, again using a sweep tee just above finished floor in a newly constructed wall, tie-in a 2" waste drain for the urinal just above the clean-out sweep and continue with a 2" vent straight up through the celling/roof. Any suggestions and or clarifications would be greatly appreciated. Thank you.