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<br />MWSI Project <br />Phase II Conjunctive Use Summary Report - DRAFT <br /> <br />August 22, 1995 <br /> <br />Peaking reservoirs could be located anywhere between the surface water system delivery <br />point and the conjunctive use demands. The best location, however, is likely to be near to the <br />conjunctive use well field and the conjunctive use demands. <br /> <br />Colleclion and Dislribulion Pipelines <br />Additional components of the conjunctive use system would include collection pipelines, <br />distribution pipelines and water treatment plants, <br /> <br />The well field system would include a network of collection system piping. The <br />collection system piping would bring groundwater supplies to a central location or locations for <br />storage in the local peaking reservoir, payback delivery to the surface water system, or for use <br />within the conjunctive use demand area, The collection system piping would also deliver surface <br />water in excess of current demands to the well field for recharge, <br /> <br />The distribution system is the network of water supply mains that would deliver <br />conjunctive use demands either from groundwater or surface water sourcrs depending on the <br />current supply source, Hence, the distribution piping must be able to receive and deliver flows <br />from both sources and from the local peaking reservoir. <br /> <br />Waler Trealment <br /> <br />There are a number of options for treatment under a conjunctive use plan, In the event of <br />raw water deli veries from both surface and groundwater systems, an efficient plan would be to <br />construct one local treatment plant near the area of the conjunctive use demands, A second <br />option would be a separate treatment plant for groundwater which would be directly connected to <br />the well field and would treat the portion of groundwater which would be fed directly to the <br />distribution system, The treatment plant at the reservoir would then treat only those flows which <br />become "surface waters," <br /> <br />This plan offers advantages in that treatment of surface water supplies is much more <br />extensive and costly than the treatment of groundwater supplies and hence there would be <br />operation and maintenance benefits with separate systems. <br /> <br />One potential issue that would should be studied further is the mixing of groundwater and <br />surface water supplies to determine and potential problems with water chemistry. This applies to <br />both treated and raw water supplies. <br /> <br />Surface Waler/Groundwaler lnlerlies <br />The last major component of the conjunctive use system would be the water-system <br />Interties to allow for delivery of surface flows to the groundwater system and for groundwater <br />flows to the surface water system, Available locations for these interties can be critical to <br />controlling pipeline costs associated with a conjunctive use plan, <br /> <br />35 <br />