View File - Development Services - City of Oxnard

WATER RESOURCES TECHNICAL REPORT• Pumping-trough Pipeline. The pumping-trough pipeline (PTP) (1986) conveys divertedriver water to agricultural pampers on the Oxnard Plain to offset pumping of wells inthis area.• Pleasant Valley Pipeline. The Pleasant Valley Pipeline (1958) supplies surface waterfrom the UWCD diversion to agricultural users in Pleasant Valley to offset pumping ofwells in this area. The Pleasant Valley pipeline terminates at Pleasant Valley Reservoir,owned by the Pleasant Valley County Water District.2.4.4 Treated Wastewater EffluentMost wastewater effluent in the Santa Clara-Calleguas Hydrologic Unit is treated anddischarged directly to the Pacific Ocean, the Santa Clara River, Calleguas Creek, andConejo Creek. Some wastewater effluent is also discharged to percolation ponds for directinfiltration and reused for irrigation. Municipal treatment plants contributing to rechargeof the regional surface water and groundwater system include the following:• City of Fillmore• City of Santa Paula• Saticoy Sanitation District• City of Moorpark (Ventura County No. 19)• City of Thousand Oaks• Camarillo Sanitation District• CamrosaReuse of treated wastewater effluent is beginning to be implemented in Ventura County.One current project, known as the Conejo Creek Diversion Project, is being implemented byCalleguas Municipal Water District (CMWD), which involves the delivery of tertiary treatedwastewater from the City of Thousand Oaks and water from the Conejo Creek to irrigationwater users in the service areas of Camrosa Water District and Pleasant Valley CountyWater District. This water would otherwise flow to the ocean and be a lost resource. Thisproject has been in operation since 2002 and is further described in Section 3.0.As further described in Section 3.0, the City of Oxnard currently discharges effluent from itswastewater treatment plant (treated to secondary standards) directly to a permitted deepocean outfall. This discharge currently does not contribute to the benefit of the waterresources of the region. Reclaiming this lost resource is the foundation to the GREATProgram that would allow wastewater to be treated to higher standards (tertiary andadvanced treatment) for reuse, primarily for agricultural irrigation and groundwaterrecharge on the southern Oxnard Plain, where overdraft conditions and the effects of thatoverdraft are most severe.2.4.5 Mugu Lagoon and Ormond Beach WetlandsMugu Lagoon and South Ormond Beach is one of the few remaining pieces of a once vastwetland. Mugu Lagoon is the most extensive wetland in the Region and supports a richdiversity of fish and wildlife that once inhabited much of Southern California’s coastalareas. Historical maps of Ormond Beach indicate that in 1855 it was an extensive system ofestuarine wetlands that extended over an area from Mugu Lagoon on the south to north ofPoint Hueneme on the north end. Since that time, the wetlands complex has declineddrastically due to the damming of upstream creeks, diversion of surface waters foragricultural and industrial development, and infrastructure controls placed on the tidal flowW112003002SCO LW1458.DOC/ 033390002 12