Mono Basin Temporary Urgency Change Petition June-July 2024
Summary
SCH Number
2024031104
Public Agency
Los Angeles Department of Water and Power
Document Title
Mono Basin Temporary Urgency Change Petition June-July 2024
Document Type
NOE - Notice of Exemption
Received
Posted
3/28/2024
Document Description
A Temporary Urgency Change Petition is requested to change operations in the Mono Basin from June 17, 2024 through July 3, 2024 (17 days). LADWP Operations will deviate from the flow requirements of Amended Licenses 10191 and 10192, due to an operational limitation on flows which can be released safely. Specifically, malfunction of the Grant Lake outlet valve is leading to cavitation in an unsafe manner above 175 cubic feet per second (cfs), which cannot be remediated prior to the requested change date. Cavitation, the rapid collapse of a bubble or void, pits metal and causes heavy vibration leading to substantial wear and tear on valves and pipes which can lead to equipment failure over an extended period of time. Therefore, safe release of flows under 175 cfs is being requested. The total volume of flow over the snowmelt period will not be modified with this request. The Mono Basin Stream Monitoring Team determined that this Petition for Change, if approved, will not result an impact on fish, wildlife or instream uses.
Contact Information
Name
Marshall Styers
Agency Name
Los Angeles Department of Water and Power
Job Title
Environmental Specialist
Contact Types
Lead/Public Agency / Project Applicant / Parties Undertaking Project
Phone
Location
Coordinates
Cities
Unincorporated Area
Counties
Mono
Regions
Countywide
Cross Streets
Grant Lake Rd and CA HWY 158
Zip
93529
State Highways
CA HWY 158, US HWY 395
Waterways
Grand Lake, Rush Creek
Township
T01S
Range
R26E
Section
15
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Section 15301, Class 1
Reasons for Exemption
In accordance with the California Environmental Quality Act, this project is Categorically Exempt from CEQA review pursuant to Section 15301 (Existing Facilities). Section 15301, Class 1 consists of the operation repair, maintenance, permitting, leasing, licensing, or minor alteration of existing public or private structures, facilities, mechanical equipment, or topographical features, involving negligible or no expansion of the existing or former use. The proposal for Mono Basin Temporary Operation Petition; therefore, no further CEQA review is required.
County Clerk
Mono
Attachments
Notice of Exemption
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