Cemex Sheet Pile Wall Extension
Summary
SCH Number
2019090395
Public Agency
Placer County
Document Title
Cemex Sheet Pile Wall Extension
Document Type
NOE - Notice of Exemption
Received
Posted
9/13/2019
Document Description
The project will construct a 125-lineal foot extension to an existing 310-lineal foot sheet pile wall that is designed to prevent the active river channel from breaching the levee that separates the channel from the 75-acre mine pond.
Contact Information
Name
Alex Fisch
Agency Name
Placer County
Contact Types
Lead/Public Agency
Phone
Name
Agency Name
Yasha Saber
Contact Types
Project Applicant
Location
Counties
Placer
Other Location Info
The project is located within a levee haul road located within the active mine site. The levee haul road separates the active channel of the Bear River from a 75-acre mine pond located 75 feet to the west of the river channel at its closest location.
Notice of Exemption
Exempt Status
Emergency Project
Type, Section or Code
Sec. 21080(b)(4); 15269(b)(c)
Reasons for Exemption
The project is exempt from the requirements of CEQA because construction of the sheet pile wall extension is necessary to prevent an emergency. The geologic unit that comprises the area that separates the mine pond from the active river channel consists of unconsolidated sands and gravels. Significant rain season erosion of the geologic unit (e.g. where the levee haul road is located) has occurred over the last several rain seasons, threatening to breach the levee during high river flow events. Breach would result in pit capture of the river and downstream flooding resulting from the discharge of the mine pond, a 75-acre lake, to the river.
Attachments
Notice of Exemption
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