David Dade, 6, sprays water onto the ‘Watershed Diorama’ on Saturday at the Santa Monica Pier Aquarium, as part of the Earth Day-Ocean Pollution Workshop. The diorama, which was custom made for Heal the Bay by Andrew C.Aguilar, is designed for pollution education and to illustrate stormwater runoff. Dade gives it a spritz under the watchful eyes of Vicki Wawerchak, the aquarium’s director, and Heal the Bay volunteer David Lloyd.