Hey there- I am looking to get some opinions/advice on an issue I have encountered with my DWV pipe where it meets slab in my garage. Backstory- I tore out some drywall in my garage a week or two ago after finding a small puddle of water that wouldn't go away and some mold on the drywall. I found a few issues after getting the drywall down. There was small consistent leak in the corner that after inspection appears to be some corroded copper tubing, then there was a more significant leak(which I think caused the actual puddle) that only occurs when the hot water in the master bath sink is run-nothing else so far replicates the amount of water that comes down other than hot water in that particular sink, and then there is this seepage at the base of the 3" DWV pipe. This last one is the most concerning to me because on the other two, while I still need to pinpoint the exact location of these leaks, I have at least been able to contain or isolate them so they are no longer causing any damage. However, with the DWV leak, I have not been able to determine if there is anything particular that causes the dampness or not. I do know though that if left unattended or checked, it seems the area would always have some dampness to it. I also know that both the master shower and guest bathtub drain down this pipe however just running them does not seem to cause a build up in moisture or anything...at least not instantaneously. Is this just a case where I need to seal the base where the pipe actually goes into the slab from normal ground moisture? Or is it an indication of a more significant issue? I do live in the Pacific Northwest so it is pretty rainy here especially this time of year. I have only been the house a little over a year so I am not super familiar with the inner working of the house yet. I have not seen any increase in my water bill and the water pressure appears to be good (70 psi based on hose bib gauge). I tried location a clean out to see about pressure testing that way but have not had any luck. Also I know that the house used to be on a septic however has been converted over to the sewer system. Any thoughts out there? I would really like to avoid calling a plumber if possible as I feel pretty confident I can fix the other two issues when I locate their source. Sorry for the long winded message, I just figured more information was better than less. I appreciate any thoughts and if there is any other information I can provided that will help let me know.