How far from underground gas or drain lines

In my eagerness to plant anything, anywhere, I have planted a couple of Chinese Che in the front yard.  They are grafted onto Osage Orange and are still small (under 4  foot).   One is planted maybe 10 feet from an underground gas line (Not thinking here) the other maybe 20 feet from the gas line.  Should I transplant these Che?  
How far from any drain or other underground pipes should these be?  Are these deep roots or shallow? This area has maybe 3 to 4 feet of soil before red clay and then another 2 foot before chert type clay.

Thanks

Personally I wouldn't worry about them being that far from the lines.  They won't be damaged if the lines need to be dug up for repair.  In other words, no biggie.