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Design services approved for next phases of Spearfish sewer trunkline project

November 15, 2017

SPEARFISH — More sanitary sewer trunkline is set to get upsized in Spearfish.

The city council Nov. 6 approved a proposal from HDR Engineering, not to exceed $60,150, for surveying, design services, and bidding services for phases 3 and 4 of the Old Town Sewer Trunkline Extension Project, which will upsize a sewer trunkline from Federal and State streets to Dakota and Dahl streets, replace a transite water main under State Street from Hudson to Dakota streets, and resurface Dahl Road from Dakota Street to Colorado Boulevard.

According to the agenda item summary, the existing sewer trunkline in the area is identified within the city’s 2017 sewer master plan update to be upsized by 2020 for the segment from Federal to Dakota streets and by 2023 for the remainder. The transite water main on State Street from Hudson to Dakota streets is identified within the city’s 2011 Municipal Water System Study to be replaced due to age and obsolete pipe material. Dahl Road would be resurfaced due to it being one of the lowest rated roadways within Spearfish.

“With our retooling of our capital plan (due to the Jackson Boulevard reconstruction project getting pushed back to 2019-20), this is one of the projects that we looked at that we thought we could possibly get to bid earlier enough next year to get good prices on,” City Engineer Kyle Mathis said during the meeting. He explained that phases 1 and 2 of the Old Town Sewer Trunkline Extension Project were completed this year, with good pricing. About $24,000 remains in the contract balance, which would be utilized for the project, and Mathis said that the intent is to get the designs for phase 3 done by January to get the project out to bid, after which, designs for phase 4 would be started.

Funding for the design fees come from the following funds: Sewer, $30,150; water, $20,000; and second penny, $10,000.

HDR’s proposal describes that the project would extend the city’s 21-inch sanitary sewer trunkline to expand capacity and reduce flows through the adjacent sewer collection lines. Improvements include replacement of water and sanitary sewer infrastructure, relocating and constructing approximately 3,400 feet of sanitary sewer trunkline, as well as drainage/storm sewer improvements, asphalt resurfacing, curb and gutter, sidewalk, fillet, and valley gutter removal/repairs, as necessary.

Phase 3 would include the sewer trunkline realignment/replacement and patching/resurfacing as needed from Federal Street to the east end of Dakota Street to tie into the existing 10-inch line; water line replacement from Hudson to Dakota streets; regrading the east side of the Dakota and State streets intersection; and patching and resurfacing as needed, with the bid opening expected in February, with construction in spring/summer 2018.

Phase 4 would include the sewer trunkline realignment/replacement from Dakota Street to Colorado Boulevard along Dahl Road, with patching and resurfacing as needed. The tentative construction timeline for phase 4 would be in 2021. Bidding services for phase 4 construction are not included in the proposal.

The estimated cost of construction is $1.5 million for phases 3 and 4.

The first phase of the project, awarded to Rapid Construction, LLC, in February, created a parallel trunk line system in the area of town, with the purpose of providing more capacity; the current trunk line in the area has a diameter between 10-12 inches, and the new trunk line is 21 inches in diameter.

The first phase, budgeted for $567,500, started on the east alley of Michigan Street off Main Street, down Seventh Street past Jackson Boulevard to Illinois Street, Eighth Street, and Hudson Street, tying into the existing trunk line in the alley near Mountain View Elementary School, and had an Aug. 4 completion date. The current trunk line continues to convey, with the new extension significantly reducing the amount of flow that goes through the existing line to reduce the risk of backups in that area, city staff explained during the first phase of the project.

In July, the council approved the final over/under change order 1 for the first phase of the project for a decrease of $2,007.81, bringing the final total project cost to $460.035.38 and set July 17 as the date the two-year warranty began.

The council in June awarded phase 2 of the project to Rapid Construction for $187,003.82, after the company agreed to honor the prices established during the first phase of the project. Budgeted for $354,000, phase 2 consisted of realigning and extending the trunk line the remaining 986 lineal feet from the East Eighth Street alley and Hudson Street to State and Federal streets, as well as some regrading and patching/resurfacing as needed. In August, the council approved the final under/over change order 1, an increase of $18,301.28, for phase 2, bringing total cost of the project to $205,305.10 and setting Aug. 21 as the date the two-year warranty began.

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