Layoff Preferences: Applicants who possess an Interagency Placement Screening Form (Yellow Form) or a Preferential Hiring Form (Blue Form) as issued under the Department of Human Resources Management (DHRM) Policy 1.30 Layoff (Commonwealth of VA employees only) MUST attach these forms when submitting their state application and/or résumé. Working knowledge of the installation, repair, maintenance practices, equipment and materials used in skilled trades that may include one or more of the following: carpentry, masonry, plumbing, electrical, painting, Heating, ventilation and Air-conditioning (HVAC), and grounds keeping or other trade areas.