Rio Vista Valve No. 2 Modifications Project (Lake or Streambed Alteration Agreement No. 1600-2018-0087-R5

Summary

SCH Number
2018038453
Lead Agency
Fish & Wildlife 5 (San Diego) (California Department of Fish and Wildlife, Region 5)
Document Title
Rio Vista Valve No. 2 Modifications Project (Lake or Streambed Alteration Agreement No. 1600-2018-0087-R5
Document Type
NOE - Notice of Exemption
Received

Document Description
The project is limited to stream impacts to the Santa Clara River associated with the dewatering of SC Water's 84-inch treated water transmission pipeline to replace a 72-inch butterfly valve and make general site improvements that including replacing the security fencing with masonry block fencing. Two different discharge activities are required: 1) initial draining discharge of the 84-inch treated water pipeline and 2) discharge due to leakage passing through the valves. The initial draining discharge of 1.879 million gallons (MG) to dewater the pipeline will occur continuously over a two-day period, which would result in a discharge rate of 670 gallons per minute or 1.47 cubic feet per second. The discharge due to leakage passing through the valves is estimated to be 122.839 MG of potable water into Los Angeles County of public Works catch basins via a high-density polyethylene (HDPE) pipe maximum rate of 3,000 gpm (6.7 cfs) intermittently for up to 3 weeks.

Contact Information
Erinn Wilson
California Department of Fish and Wildlife, Region 5
South Coast Region 3883 Ruffin Road
San Diego, CA 92123

(562) 342-7172

Location

Cities
Santa Clarita
Counties
Los Angeles
Cross Streets
22201 & 22960 Newhall Ranch Rd and 26401 Bouquet Canyon Rd

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
S: 15301
Reasons for Exemption
The operation, repair, maintenance, permitting, leasing, licensing, or minor alteration of existing public or private structures, facilities, mechanical equipment, or topographic features, involving negligible or no expansion of use beyond that existing at the time of the lead agency's determination.
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