Emergency Interim Remedial Measures for Sand Dam Embankment and Spillway

2 Documents in Project


SCH Number
Public Agency
California Department of Parks and Recreation
Document Title
Emergency Interim Remedial Measures for Sand Dam Embankment and Spillway
Document Type
NOE - Notice of Exemption
Document Description
California State Parks and Newmont USA Limited propose to install interim remedial measures to ensure the safety and reliability of the historic Sand Dam embankment and spillway at Empire Mine State Historic Park. The proposed interim remedial measures will be installed just upstream of the spillway inlet and at the base of the spillway chute (plunge pool) to provide risk reduction to the San Dam performance. This project is compatible with the environment setting and follows Rehabilitation. Work will: At the Spillway Inlet - Install approximately six gabion baskets to supplement the existing trash rack at the culvert inlet. The gabion baskets will be constructed and spaced apart to allow free-flow of storm water between the gabions to the culvert and spillway. At the Plunge Pool - Rock riprap will be placed at the base of the existing spillway chute to armor the exposed native subgrade soil and protect against additional scouring. Rock riprap will be used for erosion protection; no manufactured materials will be used that could degrade water quality

Contact Information

Joel Bonilla
Agency Name
California State Parks
Job Title
Environmental Coordinator
Contact Types
Lead/Public Agency


Grass Valley
Cross Streets
East Empire Street and Empire Ct
Other Location Info
The project is located within Empire Mine State Historic Park
Other Information
Work will occur upstream and downstream of the Sand Dam embankment.

Notice of Exemption

Exempt Status
Emergency Project
Type, Section or Code
Sec. 21080(b)(4); 15269(b)(c)
Reasons for Exemption
The Project entails emergency repairs to publicly or privately owned service facilities necessary to maintain service essential to the public health and safety. Emergency repairs include those that require a reasonable amount of planning to address an anticipated emergency.


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