Maliview Wastewater System Infrastructure Upgrade
The Capital Regional District (CRD) is in the process of upgrading the Maliview wastewater system on Salt Spring Island to comply with provincial requirements, federal wastewater regulations and the Fisheries Act.
The project received grant funding in 2022 and detailed design work is now underway. Before construction can begin, rate payers will need to approve a borrowing bylaw to secure funds for the share of funds they remain responsible for. To learn more, please read:
Background
The Maliview Wastewater Treatment Plant (WWTP) is a 60 m3/day Rotating Biological Contactor (RBC) secondary treatment plant that discharges treated effluent into the marine receiving environment of Trincomali Channel.
The Maliview WWTP has been experiencing challenges in consistently meeting regulatory requirements.
Environment and Climate Change Canada (ECCC) officers inspected the Maliview WWTP on August 22, 2019, and collected effluent samples for toxicity testing. The samples failed both LT50 and LC50 Rainbow Trout lethality analyses. The samples also contained approximately 1.5 times greater ammonia concentration than the acutely lethal concentration to rainbow trout.
The CRD was issued federal warnings from the Environment and Climate Change Canada Enforcement Branch on September 19, 2019, which stipulated fines and punishments for noncompliance.
On October 11, 2019, the CRD outlined a three-phase corrective action plan to enhance the facility and bring it into regulatory compliance. The CRD has implemented the first two phases of the action plan and is now in Phase 3.
Phase 1
The CRD met with the Original Equipment Manufacturer (OEM) of the existing RBC who provided the following recommendations which have been implemented.
- Increased the frequency of waste sludge hauling to reduce solids retention time, which in turn improved the organic removal efficiency of the RBC.
- Increased the fats, oils and grease (FOG) removal frequency which improved the organic removal efficiency of the RBC.
- Removed some biomass from the first stage of the RBC which promoted a healthy re-growth of biofilm on the RBC contactor discs.
- Remedied the short circuiting of the return activated sludge from the primary clarifier to the secondary clarifier.
- Reassessed plant performance and efficiency once all actions were completed.
These actions improved the effluent quality from the WWTP. However, there are still periodic exceedances of the effluent quality criteria due to high influent loading of Total Suspended Solids (TSS) and Biological Oxygen Demand (OD) to the facility.
Phase 2
The CRD retained Associated Engineering (B.C.) Ltd. (AE) to assess the WWTP upgrade engineering design basis, treatment technology options analysis, and conceptual design. This work was completed in 2020. The secondary treatment technology selected is Moving Bed Biofilm Reactor (MBBR) which is being advanced to further costing and design stages. AE’s scope of services included:
- Review of the existing Asset Management Plan and past engineering studies.
- Review and/or collect influent flow and quality data to develop a design basis to inform future stages of design.
- Review site constraints and characteristics to inform future stages of design.
- Develop and recommend a conceptual design for wither augmenting the existing WWWTP or upgrading to a new technology.
The CRD also completed a public outreach campaign with an intent to educate the wastewater system users about the negative impacts of FOG on the sewer system. This campaign included mailouts to every home in the service area and was completed in early 2020.
In 2021, the CRD engaged with residents located within the Maliview sewer service area ("ratepayers"). A virtual open house provided an overview of the upgrades and borrowing options for the treatment facility.
You may view the following materials at any time:
Phase 3
The current and final phase of the action plan is to complete the design and construction of the upgrade of the Maliview WWTP.
This phase includes several stages the CRD must follow, such as equipment procurement, detailed design, final consultation with the Ministry of Environment and finally construction and commissioning.
The successful major equipment supplier has been selected and detailed design work is underway. Next, an updated Class A construction estimate will inform creation of a borrowing bylaw. Any unexpected delays due to labour, supply chain issues or work to secure electoral assent to borrow funds may impact the construction start date.
Funding
The CRD has secured $1,989,000 in joint federal-provincial funding through the Investing in Canada Infrastructure Program – Rural and Northern Communities Program. This funding will enable completion of upgrades while significantly reducing costs to be covered by local ratepayers.
The Local Government Act requires the CRD to obtain elector approval to authorize the borrowing of funds for the Maliview WWTP. There are various methods to obtain elector approval for the project including a referendum, an Alternative Approval Process (AAP) or a petition. For smaller service areas, such as the Maliview system, a petition is often the preferred method as it is the most economical. A petition may only be signed by property owners and is limited to one vote per property, as opposed to other elector approval processes that are open to all residents. It should be noted that if elector approval is not obtained, the Ministry of Environment and Climate Change Strategy has the power to issue fines and order the project to proceed regardless of the outcome.
The cost of obtaining elector approval will be paid for by the Maliview sewer service area.