Magnolia Force Main Relocation Project (Streambed Alteration Agreement No. 1600-2017-0512-R3)

Summary

SCH Number
2018058089
Lead Agency
Fish & Wildlife 3 (Napa) (California Department of Fish and Wildlife, Region 3)
Document Title
Magnolia Force Main Relocation Project (Streambed Alteration Agreement No. 1600-2017-0512-R3)
Document Type
NOE - Notice of Exemption
Received

Document Description
CDFE has executed Streambed Alteration Agreement No. 1600-2017-0512-R3, pursuant to section 1602 of the fish and game code to city of Healdsburg. 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 approx 820 ft long and the 2 replacement pipes will be approx 798 ft 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 w/o 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 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 HDPE force mains for redundancy within the city.

Contact Information
Mia Bianchi
California Department of Fish and Wildlife, Region 3
7329 Silverado Trail
Napa, CA 94558

707 944-5506

Location

Counties
Sonoma

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
15302
Reasons for Exemption
This project involves the replacement of two cast iron pipes underneath Dry Creek. The new pipes are approx the same size and carry the same function as the pipes that will be abandoned.
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