F. E. Weymouth Water Treatment Plant Filter Rehabilitation - Preliminary Design


SCH Number
Lead Agency
Metropolitan Water District of Southern California
Document Title
F. E. Weymouth Water Treatment Plant Filter Rehabilitation - Preliminary Design
Document Type
NOE - Notice of Exemption

Document Description
The filters at the Weymouth Plant range in age from 40 to 60 years old. The filters were designed to meet much less stringent performance and water quality standards than exist today. The filters have been retrofitted with dual media to enhance performance. The Metropolitan Water District of Southern California is proposing to remove and replace the media in four filters. This work would create a unique opportunity to test alternate media types and filter appurtenances within the shallow configuration of the Weymouth filter cells. Metropolitan, therefore, intends to rebuild four filters with new media and different configurations of design enhancements, so that the performance of these four filters can be monitored and evaluated during a full-scale demonstration study. During the test period, Metropolitan will assess performance with respect to water quality and the impacts of physical constraints within the existing filter cells, in order to identify the optimal configuration for rehabilitation of the remaining 44 filters. Filter modifications may include alternate types and layers of filter media, a new underdrain system, an air-scour system, and new washwater throughs. Initial efforts will include preliminary design of improvements for all four filters, inspection of the media and underdrains within one filter, and replacement of the filter media in that filter following inspection.

Contact Information
William Fong
Metropolitan Water District of Southern California
P.O. Box 54153
Los Angeles, CA 90054

Phone : (213) 217-6899


La Verne
Los Angeles

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Section 15306
Reasons for Exemption
The proposed project consists of basic data collection and resource evaluation activities, which do not result in a serious or major disturbance to an environmental resource. This may be strictly for information gathering purposes, or as part of a study leading to an action, which a public agency has not yet approved, adopted, or funded.

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at state.clearinghouse@opr.ca.gov or via phone at (916) 445-0613.

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