Cambridge East IUS Study

Regional Municipality of Waterloo
Joanne Ing, M.A.Sc., P.Eng, Senior Project Manager Regional Municipality of Waterloo Phone: 519-575-4602
Long Term High Capacity Aquifer Test

Lotowater provided well testing services for the successful drilling contractor on this competitively bid job completed as part of the Region of Waterloo’s Integrated Urban System (IUS) Groundwater Supply Optimisation and Expansion Project. The work undertaken involved the drilling of three new test wells along Townline Road in Cambridge and the subsequent completion of a constant rate aquifer test for a period of 27 days.

Upon completion of drilling, Lotowater carried out alignment and plumbness testing of each well to confirm their suitability for pump installation and operation. Lotowater also conducted flow profiles of each well while the step tests were completed to quantify the water producing zones at each location. This data was critical in the hydrogeologic assessment of the bed rock aquifer and proved extremely valuable in the characterization of the aquifer.

The existing electrical supplies at each location were insufficient to power the pumps planned for the well capacity and aquifer testing and, therefore, it was necessary to provide on-site electrical generators for the duration of the well testing portion of the project. The generators required service every 10 days of constant operation so, in order to avoid disruptions to the pumping test, an additional generator was brought to each site to power the pumps during these events. In addition, since the work as carried out in or adjacent to residential areas, the generators were acoustically isolated and temporary sound barriers were installed to minimize impacts to people living in the area.

Although the project specifications required the contractor to have the capability of pumping each well at rates up to 70 L/s, the previously conducted step tests indicated that the maximum sustainable pumping rates were lower. Concerns over the possibility of pump discharge waters interfering with the test resulted in one of the discharge points being changed to a location more than 750 m from the test well. Despite these changes, Lotowater’s large inventory enabled us to assemble test pumps that were capable of efficiently meeting the production requirements for each well.

Temporary culverts and elevated sidewalk ramps were constructed across roadways and sidewalks to allow safe unrestricted access to public rights of way during the 27 day test. Protective fencing was installed around each work area to prevent unauthorized access and to protect the public from injury.

Lotowater’s experience, equipment and large inventory of well testing pumps, hoses, meters, etc. allowed us to quickly adapt to changing conditions as requirements were modified throughout the project. Lotowater was able to complete the project safely, on budget and on schedule with minimal disruption to the general public.