Our main water supply was replaced a little over a year ago. The old lead supply line was abandoned and cut-off in the basement. It looks like the cut was made above the lead pipe where copper pipe picked up. See photo here: https://www.dropbox.com/s/k863xma831iw1kz/Abandoned-lead-pipe.jpeg?dl=0
Every now and then, when we have an unusually heavy rain, water will find its way in through the pipe. What's the best way to "cap" the pipe so we can avoid this in the future?