Lake Skinner Outlet Tower Shutdown Dewatering, (Streambed Alteration Agreement # EPIMS-RIV- 16967-R6)

Summary

SCH Number
2021040125
Public Agency
Metropolitan Water District of Southern California
Document Title
Lake Skinner Outlet Tower Shutdown Dewatering, (Streambed Alteration Agreement # EPIMS-RIV- 16967-R6)
Document Type
NOE - Notice of Exemption
Received
Posted
4/6/2021

Document Description
The Project is a dewatering event and shutdown of the Lake Skinner Outlet Tower. Dewatering is to allow staff to conduct maintenance. This event will begin April 4, 2021 continuing through April 10, 2021, or modified dates with CDFW approval. Project activities in the stream areas include the placement of erosion control measures and the release of water into jurisdictional areas from one discharge locations within Tucalota Creek. Dewatering methods include releasing water via an existing outlet pipe; diverting raw water through a filtration system, dissipation socks, or dewatering hoses; and discharging the water to stream areas.Between the defined dates, 3.1 acre feet (AF) of raw water will be released into the Lake Skinner concrete spillway, located near the southern end of the Lake Skinner Dam, and temporarily held in a grouted riprap basin at the base of the spillway. The water will be released from the basin to Tucalota Creek through an existing drain valve at a rate of 75-100 gallons per minute, equal to about 0.17-0.22 cubic feet per second (cfs). The release will be regulated at the release valve to maximize percolation into Tucalota Creek. While one dewatering discharge is planned for this location, Metropolitan may be required to dewater the Lake Skinner Outlet Tower up to five additional times at up to 5 cfs to make the necessary repairs, if deemed necessary following the post-repair inspection.

Contact Information
John Dempsey
Department of Fish and Wildlife
Responsible Agency
3602 Inland Empire Blvd. Suite C-220
Ontario, CA 91764

Phone : (909) 549-8245
John.Dempsey@wildlife.ca.gov

Location

Counties
Riverside
Regions
Southern California
Other Location Info
The Lake Skinner Outlet Tower Shutdown Dewatering project (Project) is located at the base of the Lake Skinner Dam in Riverside County, California. The Project is located within Townships 7S, Range 2W, Section 3 on the U. S. Geological Survey Bachelor Mountain 7.5 minute series quadrangle topographic map, Riverside County.

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Type – Class 1; California Code of Regulations, title 14, section (15301) Type-- Class 4; California Code of Regulations
Reasons for Exemption
This Project is limited to the repair and maintenance of an existing structures and will result in minor alterations to the land which do not involve removal of healthy, mature, scenic trees.
County Clerk
Riverside

Attachments

Notice of Exemption
EPIMS-RIV-16967-R6_NOE   PDF 182 K

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