2023 Ballot Questions for residents of Allegheny County. This Five-Year Network Assessment is a requirement of 40 CFR Part 58.10.D and it serves to describe the. Note: Allegheny County excludes Liberty-Clairton area emissions. How many times do we have to sample? Conduct the 8 basic tests at your stream location approximately every 3 weeks. Stream crossings scheduled for replacement in the East Branch Tionesta Creek drainage. This resulted in a 19 percent response rate.