View File - Development Services - City of Oxnard

WATER RESOURCES TECHNICAL REPORTto meet this objective. These scenarios are similar in development to the Phase 1 scenariosand are described below.Scenarios 2a and 2b. Scenarios 2a and 2b consist of the following:• Groundwater Recharge. 19,286 AFY of recycled water are delivered for agriculturalirrigation to growers along the OVMWD Ocean View pipeline that pumps groundwaterfor irrigation and to growers who use water from the PTP and OVMWD systems. It isassumed that this recycled water is distributed equally to wells used by those growersbased on the historical pumpage of those wells. This includes the 5 LAS wells on thePTP system and the 11 LAS wells on the PVCWD system. It is also assumed that thiswater is distributed equally over a 9-month growing season resulting in those wells notpumping that quantity of water over this time. The location of the wells used foragricultural irrigation by growers along the OVMWD Ocean View pipeline and wells bygrowers who use irrigation water from the PTP and OVMWD systems are shown inFigures 3-7, 3-5, and 3-6, respectively. This reduction is applied to the following numberof wells: 19 wells in the OVMWD area, 54 PTP user wells, and 76 PVCWD user wells.The wells for growers along the Ocean View pipeline and users of the PTP system arecompleted in both the UAS and LAS, while the wells for users of the PVCWD system arecompleted mostly in the LAS.• Groundwater Recovery. 19,286 AFY of water recharged to groundwater by deliveringthe recycled water in lieu of pumping for agricultural irrigation are recovered byextracting this amount of groundwater from wells at the City Water Yard (Nos. 20, 21,22, and 23; plus three new UAS wells) and from wells at the UWCD El Rio wellfield. It isassumed that this groundwater is pumped on a continuous, year-round basis to helpmeet the potable demands of the City. Similar to the Phase 1 scenarios, for Scenario 2a, itis assumed that 20 percent of this water is recovered at the UWCD El Rio wellfield; and80 percent of this water is recovered at the City Water Yard. For Scenario 2b, it isassumed that the percentages are reversed, so that 80 percent of this water is nowrecovered at the UWCD El Rio wellfield; and 20 percent is recovered at the City WaterYard. The pumpage is apportioned as follows for both Scenarios 2a and 2b:−−At the City Water Yard, the two LAS wells are increased to a maximum of 500 AFYeach, while the remainder of the increase at the water yard is apportioned equallybetween the two existing UAS wells and the three new UAS wells.The additional pumping is apportioned to each of the UAS El Rio wellfield wellsaccording to historic pumping in each of those wells. These added extractions areapplied to the nine El Rio wells noted earlier under the description for the Base Case.Groundwater is extracted as follows under these assumptions.W112003002SCO LW1458.DOC/ 033390002 77