PG&E Mokelumne River Water Quality/Water Temperature

Project Description

The S2S team has been responsible for implementing the water quality monitoring study program for the Mokelumne River Hydroelectric Project, FERC Project No. 137 since 2008. The water quality monitoring study is required by Condition No. 11 of the FERC Project license issued on October 11, 2001 (FERC 2001). The focus of the monitoring study is to document temporal and spatial variations of water quality in Project-affected streams under operating guidelines mandated by the FERC license.

Water quality data have been collected annually since 2000. S2S collects water quality samples utilizing a trace-metal clean technique, U.S. Environmental Protection Agency 1669, “Clean Hands-Dirty Hands” method to ensure results that are accurate and applicable to the regulatory requirements of the RWQCB California Toxics Rule. The water quality monitoring results collected each year supplement existing data and are used by the regulatory agencies to evaluate water quality relative to climatic conditions, changes in streamflow regime, and reservoir operations. The water quality monitoring data are used in conjunction with the results of other resource investigations (e.g., water temperature; riparian zones; geomorphology; and fish, macroinvertebrate, and amphibian habitat) to determine the overall effect of project flow regimes on environmental resources. Data from these monitoring programs guide the regulatory agencies in setting appropriate flow regimes as specified under the continuous adaptive management program of the SA and FERC license.

Project Details

Client: PG&E
Methods: Water Quality Testing and Water Temperature
Location: Mokelumne River, Sierra Nevada Mountains