R-708 Gas Line 021G Replacement Project (Lake or Streambed Alteration Agreement No. EPIMSSON-34951-R3)

4 Documents in Project


SCH Number
Lead Agency
California State Lands Commission (SLC)
Document Title
R-708 Gas Line 021G Replacement Project (Lake or Streambed Alteration Agreement No. EPIMSSON-34951-R3)
Document Type
NOD - Notice of Determination
Document Description
The project is limited to the removal and replacement of two existing gas transmission pipelines that cross the Petaluma River. The existing dual 12-inch diameter pipelines will be removed from beneath the Petaluma River. To remove the existing pipelines, approximately 16 linear feet from each bank of the river will be excavated to expose the pipelines. Once exposed from the banks, a barge-mounted dredging operation located in the Petaluma River will excavate approximately 8 feet in depth of the native material within the riverbed from on top of the pipeline. Dredge material will be loaded onto a barge and then stored in uplands until it can be hauled to an approved disposal site. After dredging, each pipe will be dislodged from the soil using slings attached to a barge-mounted crane and then pulled out at the south side of the river. Following pipe removal, crews will backfill each bank excavation site using clean native material and original contours would be reestablished. Pipeline removal will cause temporary impacts to the riparian and salt marsh habitat along the riverbanks of approximately 130 square feet, and temporary impacts to the open channel habitat in the Petaluma River of approximately 4,000 square feet. In addition to removing the existing pipelines, a new gas transmission pipeline will be installed. The new pipeline will cross under the Petaluma River just upstream of the existing pipes. It will entail installing approximately 492 feet of 16-inch diameter steel pipe with open trench in an upland portion of the site and approximately 1,360 feet of the steel pipe utilizing horizontal directional drilling (HDD) under the Petaluma River at a depth of 61 feet The HDD will require excavation of a bell hole on either side of the river, located in the upland portion of the site. Pipeline installation activities will not result in temporary or permanent impacts to stream and riparian habitat.

Contact Information

James Hansen
Agency Name
Job Title
Environmental Scientist
Contact Types
Responsible Agency


Northern California, San Francisco Bay Area
Other Location Info
The project is located at the Petaluma River, in the County of Sonoma, State of California; Latitude 38.221267°, Longitude -122.596617°; northern access located at 1400 Cader Lane, Petaluma, CA 94954, southern access located at the southern terminus of Landing Way, Petaluma, CA, 94954; Assessor’s Parcel Number 017-170-001.

Notice of Determination

Approving Agency
Approving Agency Role
Responsible Agency
Approved On
County Clerk
Final Environmental Document Available at
2825 Cordelia Road, Suite 100 Fairfield, CA 94534


(1) The project will have a significant impact on the environment
(2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
(2c) An other document type was prepared for this project pursuant to the provisions of CEQA
(3) Mitigated measures were made a condition of the approval of the project
(4) A mitigation reporting or monitoring plan was adopted for this project
(5) A Statement of Overriding Considerations was adopted for this project
(6) Findings were made pursuant to the provisions of CEQA


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