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DRAFT 8 -17 -07 <br />VII. FUTURE WATER PLANT SIZE (BLENDING) <br />Many water treatment plants are designed and constructed to treat the projected peak day <br />demands and depending upon process design selection, the plants may be constructed in <br />phases to meet growing community water needs. However, during recent years, several <br />metro communities are using a blending process to decrease the required water treatment <br />plant capacity and reduce construction costs. Blending is accomplished on peak days by <br />sending 75 -80 percent of the well water supply through the treatment plant and using a <br />bypass line to allow 20 -25 percent of the well water supply to go directly to the finished <br />water reservoir. Blending allows the community to supply their peak water demands with a <br />smaller water treatment plant. <br />Water treatment plants which remove iron and manganese from ground water well supply <br />systems are ideal candidates for blending. This is because the raw water supplied to the <br />treatment plant from wells normally does not cause health related issues in the finished <br />water. This process method would allow the City to supply peak day finished water that is <br />still low in iron and manganese, and to fully remove the iron and manganese from the <br />finished water during non -peak water demand periods. <br />Assuming that the City of Lino Lakes plans to follow the DNR and Metropolitan Council <br />policies regarding water conservation, the average daily water demand is expected to be <br />approximately 4 MG and the ultimate peak day water demand will be approximately 10.4 <br />MG. <br />Based upon the estimated population projections for the City of Lino Lakes, the average <br />day, maximum day, and projected yearly water demands are listed in Table 4. <br />Water Treatment Plant Study 10 13843.000 <br />