We hired Parkhill in early spring 2008 - work finally started, after many unreturned phone calls. By spring 2009 it was apparent that the walls were leaning and proper drainage was not installed. The driveway paving was also inferior. We made many calls, sent many email, contacted BBB. Finally in Nov 09 they returned, without notice, removed the cap and 1 layer of stone on 1 wall only- this did not resove the problem at all. We are now seeing green mold at the base of the walls. We have had zero quality or customer service from this company.