Diane, have you gained ten feet of beach or is it just that there is erosion to the south that makes the gain look larger? I have been thinking for a while about a similar project but was advised to put rocks in the same fashion, but just at water level, between high and low water marks and then cover it with sand (this is apparantly within DOE requirments without needing a permit). It then builds up sand where needed without causing erosion to the South, caused by the induced eddy currents. I was also going to get one of the compacting machines to run over the new sand to hopefully give the beach a headstart if any conditions such as the last few days crop up.