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Parkville Water District Agenda Item 23c September 15-17, 2015 Board Meeting(Updated September 18, 2015) Page 4 of 8 Alternative 3 - Divert Stream into Lake: This alternative consists of routing the stream flow into the reservoir, which would cause the water going into the treatment plant to contain high levels of sediment, turbidity and runoff from abandoned mines, making water treatment difficult or impossible at times. Also, diverting the stream into the reservoir would result in a large amount of sediment collecting in the reservoir, necessitating frequent and expensive cleaning. Alternative 4 - Divert Stream into Lake Overflow: This alternative consists of diverting the stream away from the reservoir directly to the lake overflow. Preliminary review of this option showed that a large of amount of wetlands would be impacted, resulting in a complicated and difficult permitting process, requiring Federal approval. The impacted wetlands would likely need to be replaced by building new wetlands at a different location. The minor benefit of utilizing the existing reservoir spillway structure did not appear to justify the time and expense associated with the permitting process. Each alternative was evaluated with respect to cost, resistance to erosion, reliability, constructability, and vulnerability to exposure to sunlight, fire, and flooding. The District and its engineers decided Alternative 2 provides the best combination of cost, constructability, and long-term reliability. TABLE 2: ESTIMATED PROJECT COST Task Cost Preliminary Design and Engineering (funded by District) $43,265 Final Design and Engineering $31,130 Construction $445,975 Construction Management $13,060 Total $533,430 TABLE 3: PROJECT FUNDING SUMMARY Percent of total Funding project costs CWCB Loan 34% $180,000 CWCB Water Supply Reserve Grant - Basin Account 9% $50,000 CWCB Water Supply Reserve Grant - Statewide Account 47% $250,000 District Cash Match 10% $53,430 Total 100% $533,430 CWCB Grant funds will be disbursed at a cumulative maximum 56% of the total of all invoices submitted for reimbursement. Permitting: A wetlands survey was conducted for the selected alternative, and no permitting issues are anticipated. Schedule: The Preliminary Design for the project is nearing completion, which includes design, engineering, and environmental and cultural assessments. Final Design and Engineering will see design drawings finalized, and construction is anticipated to be completed by January of 2017.