Federal OSHA 29 CFR 1926.51 applies to private job sites in PA.
From 20 to 199 workers: 1 seat + 1 urinal per 40 workers.
Big sites also need a service plan, not only a count.
A 60-gallon tank holds about 200 uses, one week for 10 workers.
Same-day delivery in Lancaster County by 12 pm. Weekly service included.