Allen McColloch Pipeline Shutdown Project (Lake or Streambed Alteration Agreement No. 1600-2018-0058-R5)


SCH Number
Lead Agency
Fish & Wildlife 5 (San Diego) (California Department of Fish and Wildlife, Region 5)
Document Title
Allen McColloch Pipeline Shutdown Project (Lake or Streambed Alteration Agreement No. 1600-2018-0058-R5)
Document Type
NOE - Notice of Exemption

Document Description
The California Department of Fish and Wildlife (CDFW) has executed Lake and Streambed Alteration Agreement number 1600-2018-0058-R5, pursuant to section 1602 of the Fish and Game Code to the Metropolitan Water District of Southern California (MWD). The project is limited to stream impacts associated with the dewatering and shutdown of the Allen McColloch Pipeline to replace four broken valves within existing structures, and inspect the pre-stressed concrete cylinder pipe (PCCP). Replacement of the four broken valves will occur outside of stream areas. Dewatering of the pipeline is required during dry conditions to conduct the repairs and to inspect the interior of the pipes. Project activities in the stream areas include the placement of erosion control measures, and dewatering from 40 discharge locations. This will occur within various streams including Hicks Canyon Wash, Borrego Canyon Wash, Serrano Creek, Aliso Creek, and into various unnamed streams within Rattlesnake Canyon Wash, Orchard Hills, and Small grove, San Diego Creek and Santiago Creek. Dewatering methods include diverting treated water from the pipeline through a filtration system or dewatering hoses, and discharging the treated water to the stream areas.

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

Phone : (562) 342-2140


Irvine Mission Viejo
Allen McColloch Pipeline
Other Information
Lake Forest; U.S. Geological Survey 7.5 Minute Tustin and Lake Forest Quadrangles.

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Class 1 - S: 15301
Reasons for Exemption
Consists of the operation, repair, maintenance, permitting, leasing, licensing, or minor alteration of existing public or private structures, facilities, mechanical equipment, or topographical features, involving negligible or no expansion of use beyond that existing at the time of the lead agency's determination
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