  ****Unknown Source-- There are three submerged piles located in Richmond Marina Bay.  They are labeled at "Subm piles ED".
Charted location of the three subm piles:
1) 37/54/39.67-122/21/04.10
2) 37/54/38.60-122/20/58.95
3) 37/54/37.92-122/20/49.48