Solicitation for Service: Annual Maintenance of Xtek XR H 225 Computed Tomography X-ray System: Contractor to cover the cost of maintenance per attached Statement of Work. Service Contract Labor Stand... Solicitation for Service: Annual Maintenance of Xtek XR H 225 Computed Tomography X-ray System: Contractor to cover the cost of maintenance per attached Statement of Work. Service Contract Labor Standards Wage Determination No. 2015-4143 Latest Revision applies and is incorporated by reference. This is a sole source procurement with Hadland Technologies Inc. all responsible offerors will be evaluated.