HomeMy WebLinkAboutDSD-2021-166 - Old Mill Sanitary Pumping Station - Consultant Contract IncreaseREPORT TO:Community & InfrastructureServicesCommittee
DATE OF MEETING:October 4, 2021
SUBMITTED BY:Gross,Hans,Director of Engineering Services,519-741-2200ext.
7410
PREPARED BY:Spere,Chris,Manager, Construction Engineering,519-741-2200ext.
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WARD(S) INVOLVED:Ward4
DATE OF REPORT:August 25, 2021
REPORT NO.:DSD-2021-166
SUBJECT:Old Mill Sanitary Pumping Station–ConsultantContractIncrease
RECOMMENDATION:
That the contractfor MTE Consultants Inc. for engineering services related to the Old
Mill Sanitary Pumping Station(OMSPS) be increased by $282,700, funded by the
development chargereserve fund.
REPORT HIGHLIGHTS:
The purpose of this report is to increase the budget for a project that has had
additional elements added to the consultant scopeofwork
The financial implications are limited to an additional transfer from the development
chargesreservefund, which is completely funded by growth.
This report supports the delivery of core services.
BACKGROUND:
Old Mill Sanitary Pumping Station (OMSPS) is located in the southpart of the city, on Old
Mill Road adjacent to Willow Lake Park. The project is required to replace the existing
sanitary pumping station with a new facility in order to accommodate the development of
different parcels of developer-owned land.The OMSPSproject was identified as a fully
growth-related piece of infrastructure through previous development charges studies.
Approved tenders for the provision of supplying engineering services in relation to the
completion of an Environmental Assessment, design, tendering, approval and contract
administration/construction inspection for the OMSPSwas publicly tendered by the City and
was awarded to MTEConsultants Inc.at an upset limit of $690,915.23.
REPORT:
MTE Consultant’s scope of work for this project included the completion of a Schedule B
Environmental Assessment, detailed design of anew/upgradedsanitary pumping station,
tendering of the construction of the new station including the demolition of the old station,
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and construction services (Contract Administration and Construction inspection). MTE
began the detailed design for the replacement station in 2017 with anticipated construction
beginning in 2019. Construction began in 2021 and is expected to be completed in 2022.
The original consultant terms of referenceincluded preparation of a single construction
tender. Through the design and subsequent geotechnical investigation,the soil conditions
werefound to require complex excavation including shoringto facilitate construction of new
station.MTE was requested to prepare and complete a prequalification tender for the
shoring portion of the construction.This work was not included in the original terms of
reference.
MTE’s fees were based on an anticipated 240 construction working days. The construction
of this new station iscomplex due to the depth of the excavation, the need for shoring,
extensive dewatering, overall sequencing of the construction of the new station, connection
of linear infrastructure and the demolition of the existing station. Due to this complexity, the
project was tendered to include 360 construction working days.
Dewatering of the high ground water table was anticipated and included in the tender.
However, high dissolved iron content of the ground water caused issues with the quality of
the dewatering discharge and necessitated additional testing and hydrogeological work be
carried out by MTE during construction.
The Environmental Assessment identified the old pumping station location as a potential
lookout. A record of site condition is required and it is cost effective to complete this work
through one consultant versus retaining a separate consultant to do the work in parallel.
It is staff’s recommendation that the additional costs for the OMSPSbe funded by the
development chargereserve fund. The reasons for the additional costsinclude:
MTE was asked to complete a prequalification tender for the shoring contractor. This
was not included in the original terms of reference
MTE was asked to complete a Record of Site Condition for the existing pumping
station site. This was not included in the original terms of reference
The consultant terms of reference asked the consultants to provide pricing for
construction services based on 240 working days of construction. Thisproject was
ultimately tenderedwith a duration of 360 construction days.Construction was initially
planned for 2019 and was delayed.
Issues with the quality exceedances of ground water discharge resulted in the need
for additional water testing and efforts related to the hydro-geological portion of
MTE’s scope of work
STRATEGIC PLAN ALIGNMENT:
This report supports the delivery of core services.
FINANCIAL IMPLICATIONS:
The recommendation would result in a $282,700transfer from the Development Charges
reservefundto the Old Mill Sanitary Pumping Station(OMSPS) capital account.Prior to
considering this transfer, the DC reserve fund is projected to end 2021 with a positive
balance of over $3M.
COMMUNITY ENGAGEMENT:
INFORM –This report has been posted to the City’s website with the agenda in advance
of the council / committee meeting.
PREVIOUS REPORTS/AUTHORITIES:
FCS-17-090–E17-048 Consultant Services –Old Mill Sanitary Sewer Pumping
Station
APPROVEDBY: Justin Readman, General Manager of Development Servies