Storm Facility Retrofit
Dewatering-Erosion Control-Sediment Binding
Storm Pond 53, Waterloo, Ontario, Canada
The municipal client was searching for an innovative method to safely dewater and transport sediment sludge from a stormwater management facility SMWF (storm pond). One of the proper objectives was to remove many years of accumulated sediment from the storm pond (approx. 3,000 m3) to reinstate the original design capacity and functional effectiveness.
The City of Waterloo required an integrated design & solution team and engaged both Greenland Engineering and Clearflow Group to develop the optimum solution.
Prior to this project, the city of Waterloo Council directed staff to proceed with undertaking a Stormwater Management Program and Funding Review Study collaboratively with the city of Kitchener, Ontario, Canada.
A review of the storm water program at that time showed the city of Waterloo was struggling to meet provincial and federal regulations and guidelines for storm water management and operations and maintenance. A concurrent assessment of all city-owned Storm Water Management Facilities (SWMFs) was also undertaken to determine both the current conditions of the facilities and if the facilities were continuing to meet their specified water quality and quantity control measures.
Under the assessment, the existing Pond #53 was discovered to have accumulated more than 3,000 cubic-meters of sediment since installation. The high sediment accumulation rate could be partially attributed to upstream development areas and because sediment had not been removed since assumption by the municipality. As a result, there were detrimental impacts on stream health.
During construction, it was discovered that the majority of the SWM Block base was founded on up to 5 meters of organic peat material.
Retrofit enhancements at Pond #53 were proposed by Greenland Consulting Engineers to improve sediment removal efficiency and achieve other benefits. The major benefit was the enhancement of sedimentation efficiency in the sediment forebay, resulting in improved water quality in habitat areas within the facility. Improved water quality is also attributed to the Greenland SWMF retrofit design. Pond #53 has been fully constructed and is operating.
The storm pond was dewatered and treated for safe release using Clearflow’s Patented Water Lynx™ flocculation treatment system. The Water Lynx™ Reactors were strategically located to treat the sediment laden water (high TSS – Total Suspended Solids) to accelerate colloidal sedimentation. The flow then passively traveled over Clearflow’s Lynx Treated Soil Stabilization Fabric for final water polishing, capturing and removing the TSS for fish safe water release to the environment. This innovative process significantly highlighted the effectiveness and benefits using Water Lynx™ and Lynx Ultrabind™ for SWMF retrofits/cleanouts.
Stormwater Treatment Project
TSS & Phosphorus Reduction
Town of Innisfil Subdivision, Ontario, Canada
The municipal client was searching for an innovative Total Suspended Solids (TSS) Mitigation Strategy on a newly constructed subdivision. The objective was to increase water quality in the stormwater facility before discharging to a downstream lake.
Provided an environmentally safe, effective, and efficient treatment methodology for TSS reduction to maintain water quality for downstream aquatic life.
Clearfow's Patented Clearflow Gel Block Flocculant was installed in situ within existing stormwater pipes. The passive flocculation treatment system was strategically located upstream of the existing water management ponds. During normal low to medium flows, sediment laden water (high TSS) flowing by the gel block flocculant system, accelerated the process of colloidal sedimentation.
Mining Projects History
TSS/NTU Reduction Regulatory Compliance
An existing coal mining operation required assistance in maintaining regulatory compliance for Total Suspended Solids (TSS). The site surface water is collected and treated before it’s released to a fish bearing receiving stream. Clearflow was tasked with providing an environmentally safe, effective and efficient treatment for TSS reduction while ensuring regulatory limits were met.
Clearflow’s Patented Clearflow Flocculant Gel Blocks were placed in situ providing a passive flocculation treatment upstream of the existing water management ponds. During normal low to medium flows, sediment laden water (high TSS) flowing over a duplex block design, accelerated the process of colloidal sedimentation. During the occurrence of peak flow events, a Clearflow liquid flocculant dosing station was added to match the required treatment.
The project not only hit regulatory compliance, was cost effective and environmentally safe, but also reduced the overall carbon footprint of the mine.
This mine has limited access to potable water and has safety requirement needs to maintain a certain level of water stored on-site for fire suppression. Clearflow was engaged to assist in looking for alternatives for recycling of on-site water which could be used instead of potable water for the fire suppression.
A suitable water source was found and the samples were tested determine the optimum Water Lynx product and process to use for removing the solids. Clearflow’s Patented PR5 System and WL 360 and WL494 Clearflow Blocks would be the best and most cost effective method for treatment.
With Clearflow’s solution in place the mine was able to:
- Treat up to 250 gallons (0.94 cubic meters) per minute
- Eliminate the use of potable water for fire suppression
- Recycle almost 90% of the water from the equipment wash bays
- Ensure that they no longer have opportunity to run out of potable water to maintain fire suppressant storage
- Save thousands of dollars in hauling water in the event of low supply
- No longer need to shut off secondary areas of the plant from potable water to ensure supply for fire suppression water
Erosion Control Projects History
Stantec Big Lake Project
The project was installed in an extreme environment with temperatures reaching -25 below. Soil Lynx in combination with Jute matting stabilized soil, seed, and fertilizer for enhanced growth characteristics come spring. What we found to be extremely exciting is that even during spring run off the Soil Lynx was able to hold its own and maintain its integral relationship with the soil. This was project was highlighted in a publication in April 2011, called RECPs Hold Fast of the Erosion C
Highway 897 ditches were heavily eroded; left untreated, this can cause major problems. Alberta Transportation contacted Clearflow for a solution. No outside seed was to be used, so Clearflow tested Soil Lynx tackification properties with soil and Lynx Treated Soil Stabilization Fabric while vegetation growth occurred “naturally.” Returning to the site in June of the following year revealed the establishment of local grasses within the reclaimed area. Soil Lynx was a success.
On Highway 400 an overpass was being constructed. With spring rain and runoff starting to become an issue, Clearflow was called in to protect a nearby stream. Lynx Treated Soil Stabilization Fabric and Soil Lynx were used to enhance existing BMPs. Within 24 hours a large rain event occurred and Soil Lynx was put to the test. The results were amazing. The next day the project manager decided to add Soil Lynx to the areas previously untreated.
Lac la Biche
Drilling Water Reuse
Highway 40 Northwestern Alberta, Canada
Provide an environmentally safe, effective, and efficient treatment for TSS reduction to ensure regulatory limits are met. Treatment must be mobile, have a small footprint, require little to no energy input and be operated by unskilled staff.
Clearflow’s Gel Flocculant blocks and Treated Fabric were installed in two 350 BBL weir tanks. Drilling water was pumped to the system, contacted the Gel Flocculant thus causing rapid settling of TSS in the primary tank. Clarified water was moved to the secondary (polishing) tank where ultrafine materials were filtered through the treated natural fabric.
Seeding Job History
Commonwealth Stadium called on Clearflow to fix their vegetation and soil erosion. As the soil was eroding so was the grass and seed. Clearflow used Soil Lynx and Lynx Treated Soil Stabilization Fabric to hold the seed in place and assist in growth. Commonwealth Stadium now has a wonderful lawn with no erosion.
Brooks was dealing with an extreme slope and high soil erosion. Clearflow used Soil Lynx as a tackification agent for fast growth and revegetation.