ART staff is presently assisting the Inyo County Planning Department in evaluating issues related to groundwater supply, demand, and quality for a proposed expansion, by an additional 32 units, to an existing housing development. As part of the groundwater supply evaluation, ART staff is engaged in conducting aquifer tests, evaluating aquifer data, and performing groundwater modeling to evaluate the cumulative future impacts to the groundwater supply due to additional pumping. The evaluation focuses on whether 1) the hydrogeologic analyses performed to date and conclusions regarding sustainability of the local groundwater supplies are valid; 2) identification of appropriate additional testing and analyses, if any, that may be necessary to address groundwater supply concerns; and, 3) groundwater monitoring program to detect potential future impacts to existing and future wells in the existing development.