About two years ago I moved to a county were there are mostly septic systems....no city sewer connections. I've meet with two people last season that wanted me to place a patio right over there septic tank lid. They are located about 2 feet below grade (from what I'm told). So, what are my options for 'extending' the lid to the septic tank to meet with the grade of the pavers. Is there someone I can contract out to do this work? Also, how do I go about compacting around the tank...after all its just a cement structure. FYI, when we had our septic inspection done at our house they tapped the d-box with the shovel of the TLB and it literally fell into pieces. So, does anyone come across this issue a lot...no so much the d-box but the tank itself?