Badlands Tunnel Surge Tank


SCH Number
Public Agency
Metropolitan Water District of Southern California
Document Title
Badlands Tunnel Surge Tank
Document Type
NOE - Notice of Exemption
Document Description
Due to a new pumping operation, surge pressures at the connection of the Badlands Tunnel and pipeline portion of the Inland Feeder may occur in the pipeline during events such as pump station failures. To mitigate this potential, a new surge control facility is needed. The location of the surge control facility will be at the site of the existing tunnel access structure at Inland Feeder Station 1509+00) by Gilman Springs Road. The surge control facility will consist of a new one-way open top surge tank that is connected to the 144-inch Inland Feeder via a new 96-inch lateral pipeline and an isolation valve vault. This connection will occur within Metropolitan’s fee parcel site just south of the existing tunnel access structure. A buried isolation valve vault structure will be constructed on the 96-inch lateral between the surge tank and the Inland Feeder connection. This isolation valve structure will contain one 84-inch butterfly valve and a 30-inch diameter bypass line. The above-ground surge tank will be approximately 80 feet tall and 30 feet in diameter and will be covered with steel grating, which is open to the atmosphere. The surge tank will be accessible via a spiral staircase from the ground level to the top. Other site improvements include lighting, instrumentation and security measures. Construction access will occur within existing Metropolitan patrol roads.

Contact Information

Sean Carlson
Agency Name
The Metropolitan Water District of Southern California
Job Title
Team Manager
Contact Types
Lead/Public Agency


Moreno Valley
Southern California
Cross Streets
near the intersection of Gillman Springs Rd and Eucalyptus St

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
§15301, Class 1;§15303, Class 3;§15304, Class 4;
Reasons for Exemption
The proposed project consists of the operation, repair, maintenance, permitting, leasing, licensing, or minor alteration of existing public or private structures, facilities, mechanical equipment, or topographic features, involving negligible or no expansion of use beyond that existing at the time of the lead agency's determination.The proposed project consists of construction and location of limited numbers of new, small facilities or structures; installation of small new equipment and facilities in small structures; and the conversion of existing small structures from one use to another where only minor modifications are made in the exterior of the structure. The proposed project consists of public or private alterations in the condition of land, water, and/or vegetation, which do not involve removal of healthy, mature, scenic trees.

Exempt Status
Statutory Exemption
Type, Section or Code
Reasons for Exemption
The installation of new pipeline or maintenance, repair, restoration, removal, or demolition of an existing pipeline as set forth in Section 21080.21 of the Public Resources Code, as long as the project does not exceed one mile in length.
County Clerk


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