Is this the pattern?http://www.bernat.com/pattern.php?PID=5495
Looks like over three stitches.
Ripple pattern is series of increases and decreases to make peaks and troughs. You already have the increase
with 3dc,ch3,3 dc in ch 3 space, so you would make the decrease or cluster, over the dc,top of cluster,dc from the previous row. At least that what it looks like to me.