Magnolia Force Main Relocation Project (Streambed Alteration Agreement No. 1600-2017-0512-R3)
Summary
SCH Number
2019110201
Public Agency
California Department of Fish and Wildlife, Bay Delta Region 3
(CDFW)
Document Title
Magnolia Force Main Relocation Project (Streambed Alteration Agreement No. 1600-2017-0512-R3)
Document Type
NOE - Notice of Exemption
Received
Posted
11/8/2019
Document Description
The project is limited to decommissioning two cast iron pipes conveying raw sewage across Dry Creek and replacing them with two new pipes. The length of the abandoned pipe is approximately 820 feet long and the two replacement pipes will be approximately 798 feet long dual force mains. The new pipes will be made of fusible thermoplastic in a steel casing. The steel casing will be installed by a micro-tunneling method in order to allow for pipe installation under Dry Creek without directly entering the riparian zone. This method will use a small, remotely operated tunnel- boring machine to bore through material and control the excavated material entrance into the machine. The remotely controlled micro- tunneling boring machine (MTBE) will use a slurry circuit to remove excavation spoil as the pipe jacking operation takes place. The micro-tunneling procedure will be conducted by an operator from a control cabin on surface at the jacking shaft. The steel casing pipe will have three fusible PVC or HOPE force mains for redundancy within the city.
Contact Information
Name
Mia Bianchi
Agency Name
Department of FIsh and Wildlife Bay Delta Region
Contact Types
Lead/Public Agency
Phone
Location
Coordinates
Cities
Healdsburg
Counties
Sonoma
Cross Streets
1024 Magnolia Drive
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
15302, 15304 - Class 2 & 4
Reasons for Exemption
This project involves the replacement of two cast iron pipes underneath Dry Creek. The new pipes are approximately the same size and carry the same function as the pipes that will be abandoned. Trenching will be restored to natural grade after pipes are installed.
Attachments
Notice of Exemption
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