Retrofitting a drainage system behind a stone retaining wall....

We have a 4 foot tall retaining wall constructed of stone. When it was put in, probably 50-75 years ago, the builder did not put in a drainage system. Later on down the line, someone tried to resurface it with a concrete-like product (looks like a half-hearted job though -- much is no longer there).
I'd like to get a drainage system in behind this wall but I don't want to dig down behind it if I can avoid it. I can't say as I can think of any other way to do it, but before I subject myself to THAT fun I thought I'd see if anyone else has any brilliant ideas.
Thanks......
James
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If you have clearance you may be able to bang a 6" pvc pipe thru the ground in back of the wall. This is how they put pipes under the road if they don't have a big budget for equipment. Then pull out the pipe and replace it with a perforated 4" PVC in a sock (keeps dirt out). Whether you can do this depends on your soil and clearance but it might be worth a try.

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To give more detail, the first pipe has no plug in the end so you pull out the soil with it and hope the ground doesn't collapse. The second pipe has a plugged end of course.

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There are people who job it is is to bore holes in soil.... check the yellow pages.

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