Joint Intercepting Sewer Rehabilitation Phase 1 Project, Palo Alto Regional Water Quality Control Plant
Summary
SCH Number
2023080148
Public Agency
City of Palo Alto
Document Title
Joint Intercepting Sewer Rehabilitation Phase 1 Project, Palo Alto Regional Water Quality Control Plant
Document Type
NOE - Notice of Exemption
Received
Posted
8/7/2023
Document Description
The Palo Alto Regional Water Quality Control Plant owns and maintains a 72-inch diameter underground trunk sewer constructed in 1972 and known as the Joint Intercepting Sewer (JIS), which conveys raw sewage from Mountain View, Los Altos, Los Altos Hills, and a portion of Palo Alto to the plant for treatment. Phase 1 of the Joint Intercepting Sewer Rehabilitation Project (this project) will rehabilitate the downstream portion (2,363 out of the 9,000 linear feet) of the sewer pipeline between Manhole No.4 (located on a gravel road adjacent to Byxbee Park) and the plant’s influent structure named JB-0. The proposed pipe rehabilitation will be of cast-in-place pipe (CIPP) method, which inserts a resin-impregnated cured-in-place liner into the existing sewer pipe though existing manholes. The liner is then filled with water that is heated to cure the resin and harden the liner in place. Temporary bypass pumping of sewage around the section of the sewer pipe being rehabilitated will be required to facilitate cleaning and inspection of the pipe as well as installation of the CIPP liner. The project will also include non-structural rehabilitation (concrete repair and corrosion protective coating application) of two manholes (MH-03 and MH-02) and a sewer junction box (JB-1).
Rehabilitating the sewer pipeline is necessary to support the Regional Water Quality Control Plant’s operation and to restore the sewer pipe’s service life.
Contact Information
Name
Siew Ching Chin
Agency Name
City of Palo Alto
Job Title
Project Engineer
Contact Types
Lead/Public Agency
Phone
Location
Counties
Santa Clara
Regions
Northern California
Cross Streets
2501 Embarcadero Way, Palo Alto, CA 94303
Zip
94303
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Class 1; California Code of Regulations, title 14, section 15301 Existing Facilities
Reasons for Exemption
The project is determined to be categorically exempt under CEQA Guidelines section 15301, subsections (b), existing facilities, as it involves the repair and maintenance of an existing publicly-owned utility used to provide sewerage treatment services. Most of the proposed pipeline rehabilitation work will occur below ground and will not impact the ground surface. Two elements of the work will occur above ground along the existing gravel access road: (1) establishment of access points to install the CIPP liner and to rehabilitate existing manholes; and (2) a temporary bypass pumping system that will include portable engine driven pumps and temporary above grade pipelines. Construction work is planned to occur during the dry season from mid-April 2024 through September 2024. At the conclusion of construction, all temporary facilities will be removed, and the project site will be restored to pre-project conditions.
County Clerk
Santa Clara
Attachments
Notice of Exemption
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