View File - Development Services - City of Oxnard

WATER RESOURCES TECHNICAL REPORTseparate project to provide the source of imported surface water and additionalgroundwater, respectively, for blending. The blending capacity will be 25,000 gallons perminute (36 million gallons per day) with a maximum of approximately 8,000 gallons perminute (11.5 million gallons per day) coming from onsite wells. The facility will haveoperational flexibility and will be able to blend local Oxnard or UWCD water with importedCMWD water.Blending Station No. 4 (Del Norte Blending Station)Blending Station No. 4 is located near the UWCD El Rio Spreading Grounds on RoseAvenue and serves as the primary backup to Blending Station No. 3. Blending Station No. 4currently has two sources of water: (1) groundwater from UWCD and (2) surface water fromCMWD. Groundwater delivered from UWCD is through a 20-inch steel pipe with anestimated delivery capacity of approximately 5,800 gpm or 8.5 mgd. Surface water fromCMWD is delivered through the 36-inch Del Norte Conduit with an estimated deliverycapacity of approximately 19,000 gpm or 27.4 mgd. Blending Station No. 4 has a rateddesign capacity of 24.5 mgd.Recent Groundwater ProductionThe recent potable water demand of the City has steadily risen as the City has grown. Therecent annual water production of the City over the past several years is summarized below.Recent City Groundwater ProductionCMWDYear Deliveries, AFYUWCDDeliveries, AFYOxnardWells, AFYTotalProduction, AFY1996 a 23,195 32 0 23,2271997 14,077 10,478 0 24,5551998 b 12,198 7,861 0 20,1101999 14,251 10,198 0 24,4492000 14,890 8,633 1,926 25,4492001 14,108 6,113 6,434 26,655Notes:a Surplus water and in-lieu rates were available in 1996.b The City acknowledges that there may have been a discrepancy in the metering of water during this year.The City reinitiated production from its own wells in 2000. As the most inexpensive sourceof water, the use of City well water has enabled the City to meet increasing consumerdemands without significantly increasing its own costs.The historical reduced reliance of the City on groundwater has had some unfortunateconsequences. As described in Section 2.0, FCGMA was created in 1982 to address ongoingoverdraft and seawater intrusion into the Oxnard Plain Basin. The purpose of the FCGMA isto manage the groundwater supply of the region by protecting the quantity and quality oflocal groundwater resources and by balancing the supply and demand for groundwaterresources.To eliminate groundwater overdraft and bring extractions within safe yield by 2010, theFCGMA adopted Ordinance No. 5. This ordinance established historical allocations for eachpumped in the Oxnard Plain Basin and a schedule of pumping allocation reductions. TheW112003002SCO LW1458.DOC/ 033390002 35