I just received a phone call from a new customer that had a 15' section of a 10' high retaining wall collapse. He says the wall is about 20-30 yrs. old and was existing when he bought the property. He is going to send me some pics this evening. I install 98% water features and 2% land/hardscaping. I have built one kind of large wall before with clips and goetextile. Rather enjoyed it, cause we usually build retaining walls/areas with 1-2 ton boulders, instead of using the exact sized block. Anyways, my questions are, is a section of wall able to be replaced or do I have to tear out a certain amount? Also I mentioned the use of clips/pins, gravel and geo textile to the homeowner. I told him straight up "I" won't stack it back together without the use of clips, geotextile and gravel or it will fail again. For all I know is it might've had these components, won't know til Friday @ 9:00. Did these exist 20-30- yrs ago? He has a patio on top of the area that's being retained, along with alot of plumbing in ground. He says the plumbing is 10'-15' away from the wall thou (thank goodness).Some heads up would be nice.