PCWA proposes the addition of pneumatic crest gates and micro-hydro units to be installed as part of a larger project called Duncan Creek Diversion Improvement Project, which is part of the Middle Fork American River Hydroelectric Project. The pneumatic crest gates will be installed within the notch on the spillway immediately adjacent to the south abutment of the dam and will allow for course sediment and debris to pass downstream. The addition of micro-hydro units would involve the installation of two 1,000-Watt, 48-volt direct current units, which would provide power to charge the battery bank for operation of the diversion facility. The micro-hydro units will be installed along the 12-inch instream flow pipe and housed within a vault constructed integral to the intake facility.
The pneumatic crest gates and micro-hydro units will be installed within the construction footprint analyzed in the Environmental Impact Statement for Hydropower License, Middle Fork American River Hydroelectric Project—FERC Project No. 2079-069, California (2013 FEIS) and the Final CEQA Supplement to the FERC Final Environmental Impact Statement (CEQA Supplement) for the MFP. In addition, installation of the pneumatic crest gates and micro-hydro units do not result in any new impacts not previously analyzed, or in the need for additional avoidance, protection, or mitigation measures.