The Croton Water Control Commission approved a wetlands activity permit for an accessory dwelling unit at 129 Scenic Drive West at its May 18 meeting, adding a condition that a rain garden be installed before construction begins. The permit was sought on behalf of property owners Vincente and Christine Fernandez for a project in the RA-40 residential district, referred to the commission by the Planning Board under Chapter 227 of the Village Code. The project also involves a minor site plan extension and building envelope modification — items that remain before the Planning Board. Martin Mastromonaco of Ralph Mastromonaco Consulting Engineers explained that runoff from the added impervious surface would pass through a rain garden before reaching the wetland below. He said the rain garden would moderate higher flows and improve water quality. He described a planted detention basin roughly a foot deep, with piping to carry runoff into a shallow depression and vegetation suited to the extra moisture. Chair Stuart Greenbaum said he had visited the property and described a lawn sloping toward the wetland beyond a stockade fence. Greenbaum asked who would live in the accessory unit and the purpose of the request. Mastromonaco said he had expected the architect to attend and could address only the engineering questions. Another participant noted that the questions would be addressed when the application went to the Planning Board. Discussion turned to timing. A participant recommended requiring the rain garden to be built before construction of the addition so it could manage runoff during the building process. The commission agreed and made it a condition of the permit. The project extends approximately two feet into the subdivision's building envelope, but commissioners noted that falls under the Planning Board's jurisdiction, not theirs. Greenbaum said the proposal did not appear to pose a significant encroachment issue for the wetlands. The commission voted to grant the permit. The motion passed with no dissent. The application now returns to the Planning Board for review of the building envelope modification, site plan, and ADU approval.