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rai <br /> SEH <br /> Building a Better World MEMORANDUM <br /> for All of Us" <br /> TO: Ali Elhassan, PE, PhD, MCES <br /> Emily Steinweg, MCES <br /> FROM: Christopher Larson, SEH <br /> DATE: September 17, 2020 <br /> RE: Potential Next Steps Study Examples <br /> NW Metro Regional Water Supply System Study <br /> A preliminary draft of the Northwest Metro Area Regional Water Supply System Study(Northwest Metro Study) <br /> was issued in March 2020. The report evaluated various water supply options for the Cities of Ramsey, Rogers, <br /> Dayton, and Corcoran; primarily looking at combining the Cities into a single water system and providing them <br /> with treated surface water or lime softened groundwater. The costs of connecting all four cities to a central water <br /> treatment plant is significant. The purpose of this memo is a preliminary evaluation of options that would reduce <br /> the initial capital costs. A way to reduce costs would be to reduce the trunk watermain necessary by not <br /> connecting all four cities and picking cities that are in close proximity to each other. The following sections <br /> identify two potential reduced scale options. <br /> Option 1 —Connect Ramsey, Rogers, and Dayton—Phase 1 <br /> For Option 1, it is assumed that the water treatment plant that is going to be constructed in Ramsey is converted <br /> to a surface water treatment plant. The 2040 maximum day demands for the three cities is estimated to be 18.5 <br /> MGD. <br /> Phase 1 of Option 1 would include a 20 MGD surface WTP in Ramsey, a river crossing, and approximately 4.5 <br /> miles of 36"trunk watermain. This scenario is depicted on Figure 1 (attached). The concept level costs for <br /> Option 1 are included on the following table. <br /> Item Quantity Units Unit Cost Total Cost <br /> 20 MGD Surface WTP 1 Lump Sum $601000,000 $601000,000 <br /> River Intake 1 Lump Sum $25000,000 $2,0005000 <br /> 36" Raw Wate rma i n 223000 Feet $500 $11,0005 000 <br /> River Crossing 27000 Feet $45 000 $8,000,000 <br /> Easements/ Land 10 Acres $100 000 $1 000 000 <br /> Acquisitions ' <br /> Environmental 6 Miles $507000 $3007000 <br /> Subtotal $8293005000 <br /> Contingency (30%) $24,700,000 <br /> Eng/Admin/Legal (20%) $16,500,000 <br /> Total $123,500,000 <br /> Engineers I Architects I Planners I Scientists <br /> Short Elliott Hendrickson Inc.,3535 Vadnais Center Drive,St.Paul,MN 55110-3507 <br /> SEH is 100%employee-owned I sehinc.com 1 651.490.2000 1 800.325.2055 1 888.908.8166 fax <br />