Powering through extremes: Fuel containment in Moose Creek Geomembrane selection The handling of geomembranes in arctic conditions requires special consideration: * Transport * Unfolding * Field seaming * Vehicle and personnel traffic * In-place damage * Rapid crack propagation (crystalline and semi-crystalline geomembranes) In the case of the Moose Creek instalFIGURES 8-9 Tank construction. Photos courtesy of Latitude 63 lation, project scheduling called for most of the geomembrane to be deployed and completed in colder conditions. Plus, no granular cover was desirable, and foot traffic was expected during facility operation. For these reasons, relative to the above failure modes, Enterprise Engineering Inc. specified the 8130 XR-5 ULT as the secondary containment geomembrane containment barrier. The product is designed to be used in ultralow temperature (ULT) installations and service because of its cold weather 16 Geosynthetics | June July 2023 Geomembrane installation in containment area The selected geomembrane was 8130 XR-5 ULT. Because the deployed geomembrane is flexible, it was made into large sheets in a second manufacturing step to reduce field handling and seams. This saves cost and time by minimizing field seaming and the resulting need for extensive construction quality assurance (CQA). Minimizing field seams also increases reliability. Anchoring of the fuel-resistant geomembrane was flexibility and workability coupled with other properties needed in a secondary containment application: * High puncture strength * Long-term resistance to jet fuel * Low permeability to jet fuel * Negligible thermal expansioncontraction * Seam strength equal to sheet material strength