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-