Document Title D E I R Perris Dam Remediation Program
Type Mitigated Negative Declarations
SCH# 2007061004
County Name Riverside ( South CA Region )
Lead Agency Water Resources, Department of
Abstract
NOTE: Extended review to end on April 12, 2010. The proposed Perris Dam Remediation Program includes 3 separate components: (1) Perris Dam Remediation, (2) Outlet Tower Replacement, and (3) Emergency Outlet Extenstion. Dwr proposes to implement the Perris Dam Remediation Program to remediate Perris Dam, replace the outlet tower, and construct an outlet conveyance to connect with the Perris Valley Storm Drain. The project is being proposed to address seismic safety concerns and to bring the facilities up to current safety standards. Perris Dam and Reservoir, a multi-purpose facilitiy known collectively as Lake Perris, is located within the Lake Perris State Recreation Area (SRA) in Riverside County. DWR proposes to seismically upgrade the dam by improving the foundation material with cemen-deep-soil-mixing (CDSM) methods, excavating the toe of the dam to remove the liquerfiable berm foundation material, replacing the berm foundation material with re-compacted engineered fill, and then constructing a stability berm on top of the replaced berm foundation. This remediation strategy would allow Lake Perris to return to its previous maximum operating pool elevation of 1588 ft amsl after construction.


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Source Document 22.06 MB
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