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Case Study

XTO Kaybob Plant Surface Water Management Plan

XTO Kaybob Plant Surface Water Management Plan

Advisian completed a SWMP to serve the drainage of the XTO site and to satisfy the regulatory approvals. The wet pond was design at the preferred client location with features that accommodated high groundwater levels observed in the region.

The Situation

In 2014, XTO engaged WorleyParsons Advisian to prepare a Surface Water Management Plan (SWMP) for the Kaybob Sour Gas Plant located near Fox Creek, Alberta, Canada. The completed design followed the approval in accordance with the Environmental Protection and Enhancement Act and all municipal and provincial requirements. The main feature of the SWMP is a wet pond located towards the southeastern limit of the plant area, designed to contain the active runoff volume of the 1:25 year 24 hour storm event, and to safely pass the runoff volume from a 1:100 year storm event. One the main challenges encountered at the site included high groundwater levels which required a deferent design approach and proposed dewatering solutions.

Our Solution

Our water resources team completed stormwater modelling to simulate the site pre and post development conditions. The modeling results were used to design the site SWMP, comprised of a network of ditches, culverts, berms and a wet pond for containment and treatment of runoff. The pond was designed with permanent water body to enhance settlement of pollutants and with sufficient capacity to contain the 1:25 year 24 hr storm event. Also as part of the pond design a freeboard was included to safely pass the 1:100 year storm event and an emergency spillway to convey larger storm events. Some of other design features included the installation of a liner to prevent infiltration through the bottom of the pond an underdrain system to prevent uplifts during maintenance when emptying the pond (due to existing high groundwater levels). As part of the pond design an inlet and outlet structures were designed to control levels in the pond, and for complete isolation of collected runoff volumes to allow for monitoring prior to release to the natural environment.

Value Delivered

A SWMP was completed to serve the drainage of the XTO site and to satisfy the regulatory approvals. The wet pond was design at the preferred client location with features that accommodated the high groundwater levels observed in the region. In addition, a detailed dewatering plan was prepared to aid the construction phase of the project. Grading and earthworks were also completed, to maximize the use of the site and provided sufficient area for future expansion of the plant.

Water Management Plan Map 2

Plan view of the Proposed Surface Water Management Plan for XTO Kabob Plant