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05-10-21-R
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05-10-21-R
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Name: Todd A. Blomstrom <br />Date: October 8, 2020 <br />Page: 6 <br /> <br /> <br /> <br />Table 6 – Summary of Options <br /> Advantages Disadvantages <br />Option 1 <br />(Rehab <br />Station) <br />• Reuses existing infrastructure which <br />is still in good shape, including <br />structures and force main <br />• Minimizes or eliminates flooding in <br />upstream gravity manholes <br />• Maintains existing station’s capacity <br />• Cost-effective <br />• Requires bypass throughout construction <br />• Doesn’t address basic structure elevation <br />issues causing current wastewater backup <br />Option 2 <br />(Replace <br />Station) <br />• Brand new lift station <br />• Potential to improve site layout <br />• Reuses force main <br />• Eliminates flooding in upstream <br />gravity manholes <br />• Substantial excavations, site disruption <br />• Requires either significant alterations to lift <br />station site or bypass throughout <br />construction <br />• May require additional easement <br />• Most expensive option <br />Option 3 <br />(Grinder <br />Station) <br />• Brand new grinder station <br />• Potential to improve site layout <br />• Station sized more appropriately for <br />flows received (reduced power use) <br /> <br />• Requires either some alterations to site <br />layout or bypass throughout construction <br />• Requires new force main to be constructed <br />• Station capacity would be reduced <br />compared to existing <br /> <br /> <br />Option 1 is the least expensive option and with manipulation of the on/off levels is able to <br />minimize flooding in the upstream manholes. This option also utilizes the existing <br />infrastructure that is in good shape and will make the station more consistent with other lift <br />stations in the City.
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