Dave put in a retaining wall and French drain in a home I purchased last year. Before purchasing the home I spoke to Dave and he assured me the work he did would take care of any water issues. After my patio and yard flooded the first time, I sent Dave pictures and called him and he promised he'd make it right. I never heard from him again. My neighbor called him on my behalf and again a promise of coming to fix it, and again nothing. I have since spent $3,000 fixing his work and learned that he put the drain below the wall when it should have been above, he used a 4 inch pipe when he should have used a 6 inch, and he didn't put enough slope in the drain so the water doesn't flow down quick enough, but sits in the pipe. Not to mention all the water that pours through and over the wall. Dave does NOT know enough about proper drainage issues to be dealing with them. Don't waste your money. read more