I have some pretty substantial outdoor drainage and concrete issues to resolve around my home. Everything is on a hill (adding a bit of urgency to the equation after that poor guy slid down onto Terwilliger Blvd. a couple years ago). - Steep driveway with erosion and hollow spots underneath. - Slab under an add-on room drifting away from the main foundation. Having heard horror stories about half-*ssed jobs, abandoned projects and threats of property liens from cement providers, I'm more than a little hesitant to just start dialing random numbers from the yellow pages or internet. I'm hoping to get a handful of estimates to compare, but it seems everyone is hunting, specialized/commercial only, unavailable make an estimate after work, or unable to operate a telephone. Very frustrating. Anyone here know of a reliable, honest Portland area outfit with verifiable references? Thought of trying Angies list because a competent job would certainly be worth whatever the subscription costs. But I've never spoken to ANYONE who's used the service. Open to ideas, thanks in advance.