my contractor started digging yesterday and at about 7' he hit sand and dig down to about 15' and it was still sand. the bottom of the hole was filling with water. i think he is oging to dig down a bit into the sand and then pack clay back on top of it. can someone give me some insite on wether this sand is good or bad and also the relavance of the water filling up the hole. contractor says not to worry but im worried.