Valve Leakage

When we last left the upstream valve, it had been reinstalled and leaked only a very little until we "exercised" it (open and close). Then the leakage jumped to 20 gallons per minute (GPM). Over a few days the leakage dropped to 10 GPM.
A plan was devised to:
1. Increase the down force closing the valve.
2. Close the valve without flow going through it by first closing the downstream valve.
3. Exercise the valve several cycles, full open to fully closed.
Yesterday, Friday July 22, the above three steps were taken after we first remeasured the leakage, still at 10 GPM. After we were done the flow was still at 10 GPM.
However, as before, the flow decreased as the valve seated due to the head pressure on it.
Today the leakage is at 5 GPM!
With the approval of Council, we plan on putting this Phase of the Dam Remediation Project to bed by advising the DEP of the current leakage, which we feel they will accept.