Solano Wind Project Road Erosion Repair

Summary

SCH Number
2017058393
Lead Agency
Sacramento Municipal Utility District
Document Title
Solano Wind Project Road Erosion Repair
Document Type
NOE - Notice of Exemption
Received

Document Description
The Sacramento Municipal Utility District (SMUD) is proposing to repair two access roads that were eroded during heavy rain storms in January 2017. The western erosion repair is along the main access road between wind turbine towers V90-64 and V90-17, and the eastern erosion repair is southeast of Toland Lane in unincorporated Solano County, California. The western project site work will involve removal of the existing rip-rap and cobbles for the placement of a four 18-inch diameter corrugated metal pipe culverts, each 25 feet in length, in the high flow areas to collect and transport water under the road. Approximately 90 square feet of geotextile fabric will be placed under the rip rap. The culvert pipes will be surrounded and topped with 25 cubic yards of rip rap and gravel fill at a minimum of two feet above the top of the culvert pipes. The road surface will be restored with gravel and minor grading over approximately 1,000 square feet will promote drainage off of the road surface. The eastern auxiliary road's 72-inch corrugated metal culvert and surrounding soil was washed out during a major storm event. The culvert washout area will be replaced with two new 60-inch diameter corrugated metal pipe culverts, each 30 feet in length. Some of the soil that was washed out from around the culvert was deposited approximately 40 feet down stream and approximately 100 cubic yards of that material will be re-used at the culvert repair location. Engineered fill including the washed out material, 15 cubic yards of culvert bedding, and 75 cubic yards of embankment/roadway fill will be constructed around the new culverts, compacted to a minimum 95 percent relative compaction. Approximately 120 cubic yards of rip rap will be placed on the new slopes to minimize future erosion of the slopes during high flow events. The washed out road surface will be replaced with approximately 8 inches of aggregate base (5 cubic yards). Approximately 60 linear feet of barbed-wire fence will be replaced. Both unnamed drainages at the western and eastern locations are dry and no water is expected to be present during construction. The existing footprint of the road crossings will be maintained and will not be allowed to be expanded as a result of the repair. Erosion control and slope stabilization best management practices will be implemented and all necessary permits will be obtained prior to starting construction. Construction is expected to start in August 2017 or soon thereafter and is expected to take approximately 20 days.

Contact Information
Ammon Rice
Sacramento Municipal Utility District
6201 S Street, Mailstop H201 P.O. Box 15830
Sacramento, CA 95817

(916) 732-7466

Location

Cities
Rio Vista
Counties
Solano
Other Location Info
Located at SMUD's Solana Wind Phase 3, 1785 Toland Lane, Rio Vista, Califronia 94571

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
S: 21080(b)(9), 21084, 15301(c)
Reasons for Exemption
Under CEQA Guidelines S: 15062, a lead agency must identify the rationale for making the determination that a project is exempt under CEQA. SMUD has determined that the Solano Wind Project Road Erosion Repair is exempt under CEQA Guidelines S: 15301(c), Existing Facilities, which reads, "Class 1 consists of the operation, repair, maintenance, permitting, leasing, licensing, or minor alteration of existing public or private structures, facilities, mechanical equipment, or topographical features, involving negligible or no expansion of use beyond that existing at the time of the lead agency's determination...", The Solano Wind Project Road Erosion Repair involves the repair of two existing access roads that were eroded during heavy rain storms in January 2017. The existing footprint of the road crossings will be maintained and will not be allowed to be expanded as a result of this repair and therefore is considered exempt in accordance with CEQA Guidelines S: 1530(c).
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