2007 – Concerned about wildlife habitat in the Alameda Creek watershed in Alameda County, California, the Center partnered with local watershed group the Alameda Creek Alliance to interact with two already-approved quarry projects in the Sunol area to improve conditions for imperiled species and preserve habitat. The Center had provided legal and biological expertise during two years of negotiations over the quarry projects.

May 21, 2009 – The Center and the Alameda Creek Alliance announced an historic, cooperative conservation agreement with mining company Oliver de Silva for the Apperson Ridge Quarry and the Sunol Valley Quarry. The agreement will reduce the quarries' potential biological impacts and add significant restoration elements to their plans.

Sunol Valley photo by Jeff Miller, Center for Biological Diversity