esm223_14_Reading_Oxnard_GREAT_Project_Decision-Support

esm223_14_Reading_Oxnard_GREAT_Project_Decision-Support -...

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Unformatted text preview: Advanced Water Purification Facility Groundwater Recovery Enhancement and Treatment Program Draft Technical Memorandum No. 1 Decision Science Model and Selection of Treatment Process June 2005 Prepared for City of Oxnard 251 South Hayes Avenue Oxnard, California 93030 Prepared by 325 East Hill Crest Drive, Suite 125 Thousand Oaks, CA 91360 $ASQOXNARD DSM TM_FINAL_JUNE2005_REV5 II T E C H N I C A L M E M O R A N D U M Advanced Water Purification Facility TM No. 1: Decision Science Model and Selection of Treatment Process PREPARED FOR: City of Oxnard PREPARED BY: CH2M HILL DATE: June 21, 2005 Executive Summary The City of Oxnard (City) has joined together with other local water agencies to develop a long-range regional water supply program to address water quality and supply concerns. The Groundwater Recovery Enhancement and Treatment (GREAT) Program is a water resources project that combines wastewater recycling, groundwater injection, and groundwater desalination to more efficiently use existing local water resources. The objectives of the GREAT Program are: (1) increased water supply reliability, (2) reduced water supply costs, (3) water supply dependability in accommodating existing needs and meeting planned growth and associated water demand, and (4) enhanced local water supply stewardship through recycling and reusing a substantial portion of the regions wastewater. As part of the GREAT program, the City plans to construct an advanced water purification facility (AWPF). Following treatment at the AWPF of the secondary effluent from the Citys water pollution control facility (WPCF), the purified water will be used for irrigation and/or groundwater recharge. The Phase 1 AWPF will have a feedwater (i.e., secondary effluent) treatment capacity of 6.5 million gallons per day (mgd) and a resulting product water capacity of 5 mgd. These capacities assume that a membrane system\will be utilized at the AWPF. The Phase 2 AWPF will have a build-out feedwater treatment capacity of 32.5 mgd and a resulting product water capacity of 25 mgd. The secondary effluent will be treated to groundwater recharge standards in order to produce the highest quality of water for any reuse application (i.e., irrigation or groundwater recharge). Recent trends favor the use of multiple barriers in advanced water purification facilities including dual membrane systems and advanced oxidation process that could be implemented at the AWPF. To select the optimum treatment alternative for the Citys program, a nine-step decision science modeling technique (DSMT) was employed. Using the DSMT, evaluation criteria were identified by a stakeholder group and a proven methodology was used to incorporate the stakeholder input and select the final treatment process to be pilot tested and implemented at the AWPF. T E C H N I C A L M E M O R A N D U M $ASQOXNARD DSM TM_FINAL_JUNE2005_REV5 III Eighteen treatment alternatives were identified for evaluation using the DSMT. At the Initial Eighteen treatment alternatives were identified for evaluation using the DSMT....
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esm223_14_Reading_Oxnard_GREAT_Project_Decision-Support -...

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