So, I'm starting on a section of a property that will be dealing with installing 200 feet or so of paver side walk. On section of the walk and a short retaining wall is near an old brick built septic tank.. It has a brick dome on top, and I'm not exactly sure how deep or wide it is. I'm slowly pulling that out of the HO. He just keeps telling me "it's over there". I'll pinpoint it if I can and post pics. The husband has been at odds with his wife on which sections will be done. One section of sidewalk will go over the pipe leading to the septic tank also. And that pipe is an old clay tile sectional pipe. When I go break out the old sidewalk, will a jack-hammer attachment on a dingo (or similar) be enough vibration to crack anything. Also, when I go to compact the base for walkway, and short wall, will a plate compactor be large enough to cause any issues with breaking the pipe. Thanks. Nick W.