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ObservtoryTP and South <br />Riviiiii TP Improvements <br />RIVANNA WATER & SEWER AUTHORITY <br />(RWSA) I CHARLOTTESVILLE, VA <br />Miles served as Project Manager for the Preliminary <br />Engineering Report and Chris now serves as the Project <br />Manager for the design project for improving two separate <br />surface water treatment plants under one construction <br />contract. <br />The capacity of the 5 mgd Observatory WTP is to be <br />expanded to 10 mgd and include a new pretreatment <br />chemical storage and feed building, renovation of the <br />sedimentation basins considering lamella plate settlers, <br />reconstruction of the 1953 filters and expansion of the <br />intermediate pumping system, and the addition of 4.0 MGD <br />of granular activated carbon (GAC) contactors and chlorine <br />contact (CT) tank. <br />The 12 mgd South Rivanna WTP improvements will <br />include the addition of two new 3 mgd filter cells, a new <br />administration building, and miscellaneous treatment <br />process and electrical power and SCADA improvements. <br />The estimate cost of this combined improvements project is <br />$35M. <br />REFERENCE DaveTungate <br />Water Manager — RWSA <br />434.977.2970 x 155 <br />SEH TEAM <br />Chris Larson I Project Manager <br />Kevin Young I Project Engineer <br />John Thom I Water Operations Specialist <br />Reverse Osmosis Softening Pilot Study <br />CITY OF LAKEFIELD, MN <br />SEH teamed with a reverse osmosis (RO) equipment <br />manufacturer to conduct a 146 day pilot study to evaluate <br />RO as a centralized water softening process. Centralized <br />softening is being implemented in order to remove Point of <br />Entry (POE) ion exchange water softeners that introduce <br />chloride to the water during regeneration cycles. The <br />primary driver for the project is a chloride limit in the <br />wastewater treatment facility's NPDES/SDS permit. SEH <br />completed the design for the RO system and pretreatment <br />improvements to the existing WTP and the project is <br />currently entering the bidding phase. Mass balance <br />calculations show that a 99.8% reduction in chloride <br />concentration will be achieved after ion exchange water <br />softeners are removed within the City. <br />REFERENCE Kelly Rasche <br />Clerk <br />507.662.5457 <br />SEH TEAM <br />John Thom I Water Operations Specialist <br />Nick Brula I Mechanical Engineer <br />Kevin Young I Project Engineer <br />Chad Westbrook I Electrical Engineer <br />SHORT ELLIOTT HENDRICKSON INC. 22 <br />