When a nor'easter comes in off the water, North Reading gets the heavy kind of snow — wet, dense, the sort that loads a shovel and bends the arborvitae flat. J.R. and Sons Construction works those storms, plowing driveways and lots, clearing walks, and treating the ice that follows a midday thaw. Fifteen miles from the coast the rain line can sit right over town for hours before it makes up its mind. That means going out more than once and pushing the banks back before the next round fills them in again. The reward arrives at daylight, when a wide-open drive says the storm has already been dealt with.