Russian River County Sanitation District Geotechnical Investigation


SCH Number
Public Agency
Sonoma County Water Agency
Document Title
Russian River County Sanitation District Geotechnical Investigation
Document Type
NOE - Notice of Exemption
Document Description
The proposed project is a detailed geotechnical investigation to characterize the soil and geology underlying the Russian River for a potential future sanitation infrastructure replacement project. Activities consist of drilling a six inch-diameter bore hole approximately 100 feet deep on two sites on either side of the river to obtain core samples. Due to the existing steep bank contour on one of the sites, a temporary pad would be constructed by clearing vegetation along the streambank, and grading to create an approximately 20 x 80 foot flat area for the drill rig. Material excavated would be temporarily stockpiled off-site and used to return the site to pre-construction contours after drilling is complete. A total of 416 cubic yards of material is anticipated to be excavated. Ten riparian trees with a diameter of greater than five inches are anticipated to be removed, along with several shrub thickets and small trees. Bioremediation and bank stabilization techniques would be used to stabilize the graded streambank and the site would be revegetated following construction.

Contact Information

Patrick Lei
Agency Name
Sonoma County Water Agency
Job Title
Environmental Specialist II
Contact Types
Lead/Public Agency / Project Applicant / Parties Undertaking Project


Unincorporated Area
Northern California, Unincorporated
Cross Streets
Summer Bridge and Vacation Beach Roads
State Highways
Hwy 116
Other Location Info
The Proposed Project is located at the Summer Bridge/Vacation Beach Rd. crossing on the Russian River, approximately 1.25 miles SSW of Guerneville, CA (Figure 1), in unincorporated Sonoma County.
Other Information
Driving directions from the intersection of River Road and Armstrong Road in Guerneville, CA. Travel west along River Road for approx. 1.9 miles. Turn left onto Summer Bridge Road and continue for approx. 850 to the Project Area.

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Class 6; 15306 Information Collection
Reasons for Exemption
This project consists of basic data collection and resource evaluation activities that would not result in a serious or major disturbance to an environmental resource. The activities are for information gathering purposes for a study leading to an action that a public agency has not yet approved, adopted, or funded. Upon completion of drilling, the site would be restored to preconstruction conditions and revegetated, therefore no serious or major disturbance to an environmental resource is anticipated.
County Clerk


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