UC Davis Hypolimnetic Oxygenation System Pilot Program (Lake Alteration Agreement EPIMS Notification No. LAK-64924-R2)
Summary
SCH Number
2026060657
Public Agency
California Department of Fish and Wildlife, North Central Region 2
(CDFW)
Document Title
UC Davis Hypolimnetic Oxygenation System Pilot Program (Lake Alteration Agreement EPIMS Notification No. LAK-64924-R2)
Document Type
NOE - Notice of Exemption
Received
Posted
6/15/2026
Document Description
The California Department of Fish and Wildlife (CDFW) has executed
Lake Alteration Agreement EPIMS Notification Number LAK-64924-R2, pursuant to Section
1602 of the Fish and Game Code to the project Applicant, University of California Davis.
A temporary hypolimnetic oxygenation system (HOS) pipeline will be installed to deliver
compressed oxygen gas from the Clearlake Oaks County Water District property adjacent to
Clear Lake, along the District’s pier paralleling the water treatment plant’s intake pipes, and
into the lake. The intent of the HOS is to improve water quality conditions (increased
dissolved oxygen) for native fish. The in-lake components include two pipelines of 20,000
linear feet reaching from the pier around the west end of Rattlesnake Island and into the
deepest part of Oaks Arm where the oxygen diffusion takes place. The pipe will be
assembled in sections and floated from the beach into the lake until the entire pipeline is
assembled and ready to float by boat into position in the lake. The in-lake pipeline will then be
sunk to the bottom using concrete anchors. The concrete anchors for the in-lake pipeline will
rest on the top of the lakebed, with the diffuser line suspended approximately 1 to 3 feet
above the lakebed during operation. There will be no shoreline nor lakebed excavation or
construction.
Contact Information
Name
Alexander Tremblay
Agency Name
University of California Davis
Job Title
NA
Contact Types
Parties Undertaking Project
Phone
Email
Name
Will Kanz
Agency Name
California Department of Fish and Wildlife
Job Title
Environmental Scientist
Contact Types
Lead/Public Agency
Phone
Location
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Type – Class (4 and 6); California Code of Regulations, title 14, sections (15304, 15306)
Reasons for Exemption
The project includes the installation and removal of
temporary floating, in-water oxygenation pipes and the temporary placement of concrete
anchors to hold the pipes beneath the water surface to distribute oxygen gas; these actions
comprise minor alterations to land and information collection with no associated significant
environmental disturbance.
County Clerk
Lake
Attachments
Notice of Exemption
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