Agenda - 01-16-2002 - 8d - Laserfiche WebLink

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y Chance Order3, Automatic Flashing Valves—One ofthe challenges o£the Ragvs Read project since its inception is the requirement that the project's water mains be size!large enough to provide fire protection flows and pressures throughout the neighborhood and accommodating the projected demand of future development in adjacent areas(such as the Greene Tract),while shnultancously providing high quality drinking water to a relmively few existing customers. This requirement poses something of corundum in that potable water is treated with disist'ectant chemicals musatly chlorine or a chlorine command)that dissipate from the treated water within a short period of house(generally a week or less), Accordingly,for water to remain parodic(by law,retaining a measurable chlorine residual),it must be regularly replenished(or'YUtned over')in the water mains. This replenishment is accomplished etches when the water is wnsaaed by local users or whea the utility routinely probes water from aparhon of the systain that would experience inauf5cient water turnover otherwise, Tbere is Ihftle question that the limited number of potential totaling water cuttamars w the Rogers Road couramunity said the speed.or lack thereof,at which they will consent to the system will mandate that the system be flushel regularly. OWASA proposes to mcomphshthe nashingpmee s byinstalling automated flushbrg valve apparatus at thummeatione in the Rogers Road system. At each location, a battery powered fines and flush valve system will operate to open a flashing valve a predetermined times said for predetermined ivtervzls that have been calculated to stairs that the water available to consumers iscrumnsporpolydisinfaimid. The final cast for the pardlese and installation of these valves and associated apartment but not yet been construed_ However, the total cost has been estimated by OWASA staff to fall in the$20,000 to$25,000 range These have been several questions as ro the efficacy of the automated Rush valve installation as opposed to some son communist flushing process that would continue until demand generated flow is sufficient to provide the necessary mmoverofwater. While there is little question that such a process could be implemented for this parocular subsystem of OWASA's water distribution network,it would be a time ming suit staff intensive operation for OWASA. OWASA will alreadybe called upon m bear the costs of the water that is lost through the flushing premium,regardless ofwhether that operation is antassead or manual. The question of the extent of those coati has been vary recently posW to OWASA staff,but the answeris not yet available. ff l may provide additional infrmmtico at this time,please advise. I