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HomeMy WebLinkAbout2021-3092BOLTON& MENK 7533 Sunwood Drive NW Suite 206 Ramsey, MN 55303-5i 19 Ph: [763) 433'2851 Fax: [763] t+27-0833 Botton-Menk.com Real People. Real Solutions. April l5.2OZl Kevin Hansen, P.E. Director of Public Works / City Engineer Public Works Department 637 38th Avenue NE Columbia Heights, MN 55421 RE: Proposal fbr Engineering Services - Regional Sanitary Sewer Assessment - Sewer District M 108 Dear Mr. Hansen We appreciate the opportunity to present this proposal for the regional sanitary sewer capacity analysis. This sewer district is ultimately served by MCES interceptor and meter M I08. During heavy rains. sewer backups have been reported that are likely due to excess inflow and infiltration (UI) and limited downstream capacity. The City anticipates potential changes to land use identified in the 2040 Comprehensive Plan in this sewer district that many exacerbate the capacity issues. The following scope of services will provide the City with a comprehensive assessment of the trunk sewer service Sewer District 3. PROJECT TEAM Our proposed team will consist of personnel familiar with sanitary sewer analyses and will be augmented with personnel familiar with the City of Columbia Heights. o Principal-In-Charge - Kevin Kielb, P.E. - Coordination o Project Manager - Tim Olson, P.E. - Project Analysis, Concepts and Memorandum . QA/QC - Todd Hubmer, P.E. - Group Discussions, Guidance and Reviews o Design Engineer - Dallas Jones, P.E. - Modelling and Detail Analysis SCOPE Our analysis will leverage the recently completed study of the S-inch sanitary sewer line located in Jackson Street. This assessment also included an assumed cumulative sewer service to the 10" sewer main in 43'd Avenue. Our analysis will include the following tasks: o Move the in place sanitary sewer gage in the 8" line to a location along the trunk further downstream. The sewer gage in the 10" line will remain in place. The City has a few other gages that could be deployed. We will rent an additional two meters for use in the analysis. The attached Sanitary Sewer Gage Location exhibit identifies the preferred meter locations. We assume only two additional meters will be required, but the assessment could be expanded to collect more data. We anticipate up to three months of monitoring may be required. The fee described below is for installation of three meters - two rented meters and moving one Bolton & Menk meter, while a fourth meter will remain in-place. Botton & Menk is an equal opportunity emp[oyer Contract # 2021-3092 Kevin Hansen. P.E. April 15.2021 Page 2 of 2 o Expand regional sanitary sewer model by using estimated flows based on City zoning maps and existing land uses. This will include dry weather flows and wet weather flows. We will use peaking factors as the initial method of estimating wet weather flows. Based on conversations with the City, inflow is a concern. We will use conservative peaking factors in the analysis, and augment with meter readings as they become available. o Utilize meter data collection to calibrate the hydraulic model. This will include an assessment of diurnal curves based on typical land uses and sewer-shed areas, adjusted flows based on gage data, and assessment of gaged flows versus modeled f'lows. o Determine adequate pipe size to accommodate future sewer flows. o Prepare a memorandum discussing our findings. Based on the results of the analysis, the City may decide to develop options for increasing capacity in the sewer district. Options could include flow diversion(s). overflow storage, parallel service mains, pipe bursting, or lift stations. Bolton & Menk is available to assist with further analysis, if required. SCHEDULE AND FEES We will begin the analysis immediately upon receiving the notice to proceed from the City. We anticipate 4 weeks to complete the analysis. The analysis will be updated with wet weather flows if rainfall events occur after the initial memorandum is prepared. Our proposed fees for the project are as follows: Personnel Hours Total ProjectManager 2 $ 390.00 Task Manager 12 $ I,884.00 QA/QCReviews 4 $ 960.00 Design Engineer 100 $12,400.00 Flow Monitoring (3 Months)r $13.000.00 Total Proposed Fees $28,634.00 lOne of the meters installed with the previous analysis will remain in-place and one will be relocated. Two additional meters will be installed. Based on our understanding of anticipated efforts, our proposed Not-To-Exceed fees for the work are $28,634.00. If there are any questions, please call me at (651 ) 968-7760. Sincerely, Bolton & Menk,Inc. -!r,,,^f'4rl'- Kevin P. Kielb, P.E. Principal Engineer ACCEPTED BY: .J<rsI +*"bs City fraanagJ Date: tl'lt- 2t Tim Olson, P.E. Project Manager I Botton & Menk is an equal opportunity emptoyer Y 2-