Fenton Water Diversion Removal and Stream Crossing Project (Lake or Streambed Alteration Agreement No. 1600-2018-0638-R1)

Fenton Water Diversion Removal and Stream Crossing Project (Lake or Streambed Alteration Agreement No. 1600-2018-0638-R1)

The project consists of two encroachment(s): One encroachment is for the removal of an unpermitted water diversion infrastructure from an unnamed tributary to Feliz Creek. Water was diverted to fill a nearby off-stream reservoir. Work for removal of the water diversion infrastructure will include excavation of rock and sediment away from a 12" PVC pipe to allow access to the pipe, removal of the diversion by cutting the 12" PVC pipe flush with the stream bank and placing a PVC cap on the end to prevent water from entering the pipe. Any rock and sediment moved aside during deconstruction activities will be replaced and recontoured to mimic natural stream channel morphology. The other proposed encroachment is to upgrade a failing and undersized culvert. Work for this encroachment will include excavation, removal of the failing culvert, replacement with a new properly sized culvert. backfilling and compaction of fill, and rock armoring as necessary to minimize erosion. The Notification also discloses an off-stream reservoir and well. Following project completion, the reservoir will no longer receive water via the pre-existing PVC pipe described above. During a site inspection on 1/15/2019, it was discovered that a fissure in the dam/berm wall of the reservoir was allowing water from the reservoir to spill into the unnamed tributary to Feliz Creek. Future improvements to the dam at this site would require engineering to minimize the risk of a catastrophic stream bank failure. This could be addressed through an amendment to this Agreement or a future Notification. Additionally, a landslide on the bank of the unnamed tributary to Feliz Creek was discovered on the project parcel. Future work to address this issue would require "engineering and an LSA Notification. The well disclosed in this Notification is used for irrigation and domestic use with an estimated yield of 40 gallons per minute. CDFW did not evaluate hydraulic connection of the well to surface water, nor was a hydrogeologic evaluation prepared by a licensed geologist provided for CDFW review.

Mendocino