Joint Regional Water Supply System Chlorine Booster Station and Loop Pipeline System Improvements


SCH Number
Public Agency
South Coast Water District
Document Title
Joint Regional Water Supply System Chlorine Booster Station and Loop Pipeline System Improvements
Document Type
NOE - Notice of Exemption
Document Description
The Joint Transmission Main (JTM) is a water pipeline that was constructed in 1961 to convey potable water from a Metropolitan Water District (MWD) connection in Irvine, California to cities in southern Orange County, ending in northern San Diego County at the San Onofre State Park San Onofre Bluffs Campground. Collectively, these facilities comprise the Joint Regional Water Supply System (JRWSS), a section of which is contract operated by South Coast Water District (“District”). Closure of the San Onofre Nuclear Generating Station (SONGS) has led to a significant reduction in water supplied by the JRWSS pipeline. The lower flow has resulted in a longer residency time and inconsistent chloramine residual at the downstream end of the JWRSS. The District plans to install a chlorine booster station, re-circulating pump, and a loop pipeline (collectively, the “Project”) to maintain chloramine residual that meets State standards. A new 3-inch recirculating loop pipeline of approximately 5,460-feet in length would be installed within the existing and additional JRWSS 20-foot easement in Unnamed Loop Road and Old Pacific Highway.

Contact Information

Marc Serna
Agency Name
South Coast Water District
Job Title
Assistant General Manager
Contact Types
Lead/Public Agency / Project Applicant / Parties Undertaking Project


San Diego
Southern California
Cross Streets
Unnamed Loop Road and Old Pacific Highway (San Onofre)

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Section 15302 (Class 2) (c);Section 15304 (Class 4)
Reasons for Exemption
The project is exempt from environmental review with the following findings: (a) CEQA Guidelines list classes of projects that have been determined to not have a significant effect on the environment and are therefore exempt from the provisions of CEQA. • Section 15302 (Class 2) (c) categorically exempt replacement or reconstruction of existing utility systems and/or facilities involving negligible or no expansion of capacity. The proposed recirculating pipeline will not change the capacity or operation of the existing JRWSS pipeline in any way. • Section 15304 (Class 4) categorically exempt minor alterations to land. The proposed project consists of only minor alterations to land. The surface of the roadway and work areas will be restored when work is completed. (b) The project pipeline alignment is within the paved surface of roads without natural or native vegetation that does not provide habitat for any sensitive species. No sensitive habitat or special status species would be adversely affected by the project. (c) Review by District staff indicates there are no unusual circumstances associated with the project or the pipeline alignment that would require further environmental review.
County Clerk


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