Geotechnical Investigation for Soledad Canyon Relief Trunk Sewer Section4 Proposed Future Project

Summary

SCH Number
2021010334
Public Agency
Los Angeles County Sanitation District
Document Title
Geotechnical Investigation for Soledad Canyon Relief Trunk Sewer Section4 Proposed Future Project
Document Type
NOE - Notice of Exemption
Received
Posted
1/27/2021

Document Description
The proposed project activities involve maneuvering a geotechnical drilling rig from the Santa Clara River trail (which runs along the northern edge of the Santa Clara River) down an existing ramp into the riverbed. Soil samples will be collected via geotechnical boring (sonic drilling) to a depth of approximately 40 feet at three locations in the Santa Clara River (Exhibits 1 and 2). Boring activities would occur for up to two days per test hole location, for a total duration of six days. Collection of soil samples is necessary to inform the design and construction methods of a future project that will consist of the installation of a 27-inch subterranean sewer line that will cross under the Santa Clara River. Upon completion of geotechnical boring activities, holes will be filled with cement bentonite grout. All soils cuttings that are extracted during geotechnical boring will be placed in 55-gallon drums and removed from the site. A biological monitor would be present during all drilling activities and would identify access routes and drilling locations to avoid potentially sensitive habitat areas.

Contact Information
Marvin Holmes
Los Angeles County Sanitation District
Lead/Public Agency
1955 Workman Mill Road
Whittier, CA 90601

Phone : (626) 417-1293
mholmes@lacsd.org

Santa Clarita Valley Sanitation District
Project Applicant

Location

Cities
Santa Clarita
Counties
Los Angeles
Cross Streets
White's Canyon Road and Sloedad Canyon Road

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
15304 and 15306
Reasons for Exemption
This project has been determined to be categorically exempt from the California Environmental Quality Act (CEQA) pursuant to the State CEQA Guidelines (Public Resources Code §21080(b)(9); Administrative Code, Title 14, Division 6, Chapter 3, Article 19, Sections 15304 and 15306). SCVSD proposes to drill three exploratory drills to collect soil samples over six days in the Santa Clara River. A biological monitor would be present during all drilling activities and would identify a route to the drilling locations to avoid potentially sensitive habitat areas. The Project would not involve any expansion or other alteration in the Santa Clara River.

Attachments

Notice of Exemption
Exhibits 1 and 2 OCR   PDF 758 K SCTS-4__NOE_to_State_Clearinghouse OCR   PDF 120 K

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