The Stop Pacheco Dam Coalition, which filed a lawsuit against Santa Clara Valley Water District’s (Valley Water) Pacheco Dam project in June, has been joined by the Sierra Club and the Amah Mutsun Tribal Band. The lawsuit challenges Valley Water’s reliance on exemptions from the California Environmental Quality Act (CEQA) for the extensive geotechnical and other investigations to plan and engineer the proposed 140,000-acre foot reservoir project atop remote Pacheco Pass in southern Santa Clara County.