Jimdean
Bob is right on, the first test is after flushing, and the flushing is actually intended to remove the initial high chlorine levels used to disinfect the pipe. The second sample is a check for what exists in the background of the pipe. Flushing again defeats the purpose, as your...
You're probably aware of OSHA and NEC requirements, but if this is you're first pump station you may want to review them. Working clearances are important as noted in the previous responses, as well as the ability to take something apart and put it back together. Isolation valves so units may...