Lower Stone Canyon Microfiltration Plant Recommissioning Project


SCH Number
Public Agency
Los Angeles Department of Water and Power
Document Title
Lower Stone Canyon Microfiltration Plant Recommissioning Project
Document Type
NOE - Notice of Exemption
Document Description
The purpose of this project is to conduct the necessary equipment and process upgrades to recommission the Lower Stone Canyon Microfiltration Plant (MFP). The Lower Stone MFP is intended to operate as an unmanned facility. The plant was most recently operated in 2013. Originally, the plant was designed to operate at 6.5 million gallons per day (mgd) and 10 cubic feet per second (cfs). The Lower Stone MFP will be used as a stand-by source to be utilized only in the event of elevated reservoir levels. Department of Drinking Water (DDW) has also indicated that it may allow a temporary chlorine-chloramine interface zone during emergency operation of the microfiltration plant when reservoir elevations need to be controlled. The operational upgrade is a replace in-kind of the existing filter membrane. The Lower Stone MFP consists of equipment related to Zinc Orthophosphate, Sodium Hypochlorite, Sodium Hydroxide, Sodium Bisulfite, and Citric Acid. These systems fall under the Clean in Place categorization. The existing Ammonia treatment system will not be utilized at this time. Relevant Work will include: Installing ammonia injection tubing into filtrate manifold, repairing and maintaining the Air Compressor Systems, recovery of membrane modules, and demolition of existing skid mounted filter modules. Project Construction is expected to begin in March of 2021. LADWP has made a commitment to the Department of DDW to have the Lower Stone Canyon MFP operational by the end of 2021.

Contact Information

Christopher Lopez
Agency Name
Los Angeles Department of Water and Power
Contact Types
Lead/Public Agency


Los Angeles
Los Angeles
Other Location Info
15000 Mulholland Dr, Los Angeles, CA 91316

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
15301-Class 1
Reasons for Exemption
In accordance with CEQA, it has been determined that the recommissioning of the Lower Stone Canyon MFP – with no change to existing use or intent, is exempt pursuant to the Categorical Exemption described in CEQA Guidelines Section 15301, Class 1, Existing Facilities. Class 1 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 existing or former use. The key consideration is whether the project involves negligible or no expansion of use.
County Clerk
Los Angeles


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