I had a deck built in 2006. The deck is over a walkout basement. Every winter the deck heaves in certain areas about 6" causing the upper patio door to pinch shut. The deck posts are on 12" diameter sono tubes and 4 1/2' deep (which according to the city I live in is below frost depth). Also, I had a patio and outdoor kitchen installed that also heaved 3+" causing damage to my siding on the house, pinched the basement patio door shut and now that spring is here, has not leveled out with the spring thaw. I have had 2 patios installed (1 concrete which was removed last year in favor of a paver patio). The new patio was set on about 18" of washed stone with a drain tile system to daylight with crushed limestone and the pavers on top. The kitchen area has pulled away from its retaining wall it was built against and the granite countertop has cracked in half. The kitchen was built on the original concrate patio so it only has about 4" of crushed road gravel underneath the slab. I am in desperate need of some advice on how to resolve this. There had been some water issues the past few years with city water junction boxes leaking. Could I have water from the city under my house causing this? What can I do? Any responses would be very appreciated. If you have any further questions, please ask!