View File - Development Services - City of Oxnard

WATER RESOURCES TECHNICAL REPORTdelivered to both the Pleasant Valley pipeline and PTP for farmers to use in lieu of pumpingtheir wells.3.1.4 City of OxnardThe City of Oxnard, with approximately 182,000 residents, is the largest city in the OxnardPlain and Ventura County and the 20th largest in the state. The City owns and operates itsown municipal water supply system. The City has three sources of water available to supplyto its customers. These include (1) imported surface water from CMWD, (2) groundwaterfrom UWCD, and (3) local groundwater from the City wells. The City blends the higherquality imported water (~300 mg/L TDS) with groundwater (~1,100 mg/L TDS) on a oneto-onebasis to provide a balance between quality and cost. Blending occurs at four blendingstations equipped to blend surface water from CMWD and groundwater produced fromCity wells or purchased from UWCD. The only exception to this policy is water delivered toProcter and Gamble. Procter and Gamble receives unblended surface water directly from adedicated turnout to its facility. Procter and Gamble pays a higher rate for this water.Blending of the water is accomplished at the four blending stations of the City. Each of thestations is equipped to blend surface water from CMWD and groundwater from UWCD.Blending Station No. 1, located at the City Water Yard, is also equipped to blendgroundwater extracted from its four wells in lieu of, or in combination with, UWCDgroundwater. Blending Station No. 3 will be equipped with similar capabilities once itsthree wells and an iron and manganese removal facility have been completed. BlendingStation Nos. 2 and 4 rely solely on UWCD groundwater for blending.Figure 3-2 shows the location of the major water service facilities of the City. A descriptionof the existing sources of water supply and transmission facilities of the City is providedin its Water System Master Plan (City of Oxnard, 2003). A brief description of these facilitiesis given below. Table 3-1 provides water quality data from the City 2000 ConsumerConfidence Report for groundwater delivered by UWCD and the City. Table 3-2 provides asummary of water quality data for each of the three sources and a weighted average for ablend of those sources of the City.Blending Station No. 1 (Third Street Blending Station)Blending Station No. 1 is located at the City Water Yard in the central portion of the City. Ithas a rated design capacity of 50 million gallons per day (mgd) and serves as the primarysupplier of water to the southern half of the distribution system of the City. Blending StationNo. 1 has three sources of water: (1) well water, (2) groundwater from UWCD, and(3) surface water from CMWD. There are four wells, each with an approximate capacity of3,000 gpm for a total of 12,000 gpm or 17.3 mgd. Two of these wells are completed in theUAS, and two are completed in the LAS system as follows:Water Supply Wells at Blending Station No. 1Well Screened Aquifer System Capacity (gpm) Well TypeWell No. 20 Lower 3,000 ExtractionWell No. 21 Lower 3,000 ExtractionWell No. 22 Upper 3,000 ExtractionWell No. 23 Upper 3,000 ExtractionW112003002SCO LW1458.DOC/ 033390002 33