IN THE PROCESS OF EXCAVATING A POND...THAT IS BELOW A KEYSTONE WALL I HAVE COME TO A PROBLEM AREA. TRY TO VISUALIZE THIS...A 4 FOOT WALL...THAT I BELIEVE WAS INSTALLED IMPROPERLY...THEN IN FRONT OF IT 3 FEET THE HOLE FOR THE POND ABOUT 3 FEET DEEP..I KNOW ITS EXTRA DEEP..BUT THATS WHAT WAS SPEC'D. ANYWAY WHEN DIGGING FOR THE POND WE HIT DRAINAGE STONE IN FRONT OF THE WALL..I AM CONCERNED ABOUT UNDERMINING THE WALL...HERE IS MY PLAN...BUILD ANOTHER WALL INSIDE THE POND AREA...USING A PINABLE WALL SYSTEM AND SECURING THE BASE COURSE TO THE GROUND WITH 3 FOOT PIECES OF REBAR...MY THINKING IS THAT BETWEEN THE REBAR AND THE PRESSURE OF THE CLOSE TO 3500 GALLONS OF WATER THAT WILL PUSH ON THE WALL I SHOULD BE OK...LET ME KNOW WHAT YOU ALL THINK...