The Upper Feeder and Lower Feeder Shutdown Project (Project) is located at various locations in Riverside County, California. Dewatering discharge locations are

Summary

SCH Number
2021030469
Public Agency
California Department of Fish and Wildlife, Inland Deserts Region 6 (CDFW)
Document Title
The Upper Feeder and Lower Feeder Shutdown Project (Project) is located at various locations in Riverside County, California. Dewatering discharge locations are
Document Type
NOE - Notice of Exemption
Received
Posted
3/22/2021

Document Description
The California Department of Fish and Wildlife has executed Lake and Streambed Alteration Agreement number EPIMS-RIV-15797-R6, pursuant to Section 1602 of the Fish and Game Code to the Metropolitan Water District of Southern California. The Project is limited to the stream impacts associated with the one-time dewatering and shutdown of the Upper and Lower Feeder pipelines. Dewatering will begin March 1, 2021 and continue through March 2, 2021. The Project will allow staff to perform inspections and maintenance of the pipeline. Dewatering will occur at the four locations listed above and involves releasing untreated water from either a pipeline blow-off (Lower Feeder 80+40) or a pump well outlet structure (Upper Feeder 40+00, Lower Feeder 155+55, Lower Feeder 593+02) into ephemeral tributaries of the Santa Ana River and the Temescal wash. At blow-off structures, the water will be discharged via gravity through an existing permanent corrugated pipe to the discharge point in a stream channel and any remaining water left in the pipe will be manually pumped out and released. The velocity of the water being released into the channel will be manually controlled at the blow-off structure. At the pump well stations, water will be pumped through a six-inch diameter hose and discharged into a nearby ephemeral wash. Dissipation socks will be used to dissipate flows at two dewatering locations and existing riprap, rock and concrete at the dewatering locations will help dissipate water velocity and decrease erosion potential. Dewatering activities typically involve a 1-2 crew members and staging utility truck equipped with a generator adjacent to a dewatering structure.

Contact Information
Alyssa Marquez
Department of Fish and Wildlife
Lead/Public Agency
3602 Inland Empire Blvd. Suite C-220
Ontario, CA 91764

Phone : (760) 567-0332
Alyssa.Marquez@wildlife.ca.gov

Location

Counties
Riverside
Regions
Southern California
Other Location Info
The Upper Feeder and Lower Feeder Shutdown Project (Project) is located at various locations in Riverside County, California. Dewatering discharge locations are located along the Upper Feeder Pipeline at the following locations, Upper Feeder 40+00: Latitude: 33.85882, Longitude: -117.451589; Lower Feeder 80+40: Latitude: 33.84232, Longitude: -117.473787; Lower Feeder 155+55: Latitude: 33.83464, Longitude: -117.496314; Lower Feeder 593+02: Latitude: 33.86751, Longitude: -117.624035

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 (pipelines) 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-15797-R6_NOE   PDF 183 K

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