Anyone know a good drainage specialist?

[Ron S.]

I recently purchased a 2-flat in Lincoln Square.  The basement is currently unfinished.  There's no dripping/leaking going on, but there is definitely moisture on some parts of the walls.  The parging has cracked off and there's some efflorescence that's eaten away half an inch or more of brick in an area about 10 feet wide.

We plan on finishing the basement, so I'd like to address the moisture issues first and verify everything is good before we do any work down there.  With the rains this past week, I was able to identify where there was standing water for an hour or so after the storm passed, so I suspect the grading of the sidewalk running along the house is the main source of the problem.

Does anyone have a recommendation for someone that can address our drainage/moisture issues, and ideally also do whatever treating is necessary on the interior?