Massachusetts has one of the strictest codes in the country, if you have a question please ask. I am a code official in Massachusetts and would be available for a code interpretation.
Out of the trap in the 16 the pipe goes horizontal to the sanitary tee. The vertical distance from that horizontal trap arm to the top of the U in trap at 18 must be between 4 and 2 inches. Your "trap seal" looks way too deep.
Also your trap arm must be below the bottom of the sink. I recognize that this might just be a drawing anomaly, but I thought I would point that out.
My preference for a cleanout would be on the vent for the washer. That way you can snake past the santee on the trap arm.
The laundry sink could also get on in that location, though the washer would be enough.
Okay, that Cleanout would then be placed on vertical vent pipe (3) above sanitary tee (4) but below sanitary tee (2), correct?
This is awkward, but...
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