The past three Sundays, Reverend Billy and his Church of Stop Shopping have protested along with environmentalists at the planned site of a gas pipeline at Gansevoort Peninsula near the Meatpacking District. Last Sunday, in a tragic “mermaid passion play,” Billy’s wife, Savitri D, Monica Hunken and Lopie L., canoed from the W. 26th St. boat launch to Gansevoort. Hunken carried Savitri D to a bulldozer and placed her in its scoop, which, like D, was covered with pink-dot stickers — the activists’ symbol for the radioactive radon they say the hydrofracked gas will be laced with. Billy also noted with alarm that the pipeline site is near the Jane St. children’s water playground. The pipeline construction is slated to start imminently.