_______________ [date] Mr. Theodore Schade Air Pollution Control Officer Great Basin Unified Air Pollution Control District 157 Short Street Bishop, CA 93514 Tschade@gbuapcd.org Mr. Steven L. Nelson Field Manager, U.S. Dept. of the Interior Bureau of Land Management Bishop Field Office 351 Pacu Lane, Suite 100 Bishop, CA 93514 SNelson@blm.gov Dear Mr. Schade and Mr. Nelson: I am writing in support of the Mammoth Community Water District’s efforts to protect our community’s groundwater. Given the scarcity of water resources in the area and the severity of California’s drought, it is critical that a plan be put in place to ensure that the proposed Casa Diablo IV geothermal development project does not negatively impact our water supply. I share the Water District’s concerns regarding the project. Local and federal elected officials, community organizations, and several experts have raised numerous concerns regarding the adequacy of your agencies’ review of the negative impacts posed by the geothermal project to the environment and the Mammoth Lakes community. These same entities and persons have called for the development and implementation of a comprehensive plan to monitor the project’s impacts to groundwater resources and guard against the project’s negative impacts. The Water District has proposed such a plan, yet the project proponent, Ormat Technologies, Inc., has resisted working with the Water District to put this plan in place. The plan closely matches what experts at the U.S. Geological Survey have recommended. Your agencies have stated their commitment to protecting this region’s groundwater resources. It is time to honor that commitment by facilitating the development of a fair and reasonable mitigation and monitoring plan that will ensure the long-term viability of the community’s water supply. Without your leadership and involvement, it is unlikely that Ormat will seriously consider the Water District’s proposed monitoring and mitigation plan — which is the only adequate plan that has been proposed to date. I urge your agencies, as well as Ormat and other involved parties, to come to the table and work to safeguard Mammoth Lakes’ water supply. I urge you to follow through on the assurances you have provided to the public that you will work hard to ensure that Ormat’s proposed project will not detrimentally affect our community. The Water District’s proposed monitoring and mitigation plan is reasonable and fair. At a time when our community’s reliance on groundwater is at an all-time high, it is imperative that the agencies tasked with approving the geothermal project ensure that, moving forward, there is a plan in place to address and guard against the numerous concerns raised by the Water District regarding the project. Sincerely, ________________ [Name] ________________ [Address] ________________ [Address] ________________ [phone/e-mail] Cc: Patrick Hayes, Mammoth Community Water District phayes@mcwd.dst.ca.us 200/L081314kcg