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are on the QPL or the APL . Immediately remove or cover any devices that do not apply to existing conditions . All temporary traffic control devices must meet the requirements of National Cooperative Highway Research Program Report 350 (NCHRP 350) or the Manual for Assessing Safety Hardware 2009 (MASH) and current FHWA directives . Manufacturers seeking evaluation must furnish certified test reports showing that their product meets all test requirements set forth by NCHRP 350 or the MASH . Manufacturers seeking evaluation of Category I devices for inclusion on the QPL shall include the manufacturer ' s self- certification letter. Manufacturer ' s seeking evaluation of Category II and Category III devices for inclusion on the QPL shall include the FHWA WZ numbered acceptance letter with attachments and vendor drawings of the device in sufficient detail to enable the Engineer to distinguish between this and similar devices . For devices requiring field assembly or special site preparation, vendor drawings shall include all field assembly details and technical information necessary for proper application and installation and must be signed and sealed by a Professional Engineer registered in the State of Florida. Manufacturers seeking evaluation of Category IV devices for inclusion on the QPL or APL must comply with the requirements of Section 990 and include detailed vendor drawings of the device along with technical information necessary for proper application, field assembly and installation . Ensure that the QPL or APL number is permanently marked on the device at a readily visible location . Sheeting used on devices is exempt from this marking requirement. Notify the Engineer of any scheduled operation which will affect traffic patterns or safety sufficiently in advance of commencing such operation to permit his review of the plan for the proposed installation of temporary traffic control devices . Ensure an employee is assigned the responsibility of maintaining the position and condition of all temporary traffic control devices throughout the duration of the Contract. Keep the Engineer advised at all times of the identification and means of contacting this employee on a 24-hour basis . Keep temporary traffic control devices in the correct position, properly directed, clearly visible and clean, at all times . Ensure that all traffic control devices meet acceptable standards as outlined in American Traffic Safety Services Association (ATSSA ' s) "Quality Guidelines for Temporary Traffic Control Devices and Features " . Immediately repair, replace or clean damaged, defaced or dirty devices . 102 -9 .2 Work Zone Signs : Provide signs in accordance with the plans and Design Standards . Meet the requirements of 700 -2 . 5 and 990- 8 . . Use only approved systems , which I ncludes sign support posts or stands and attachment hardware (nuts , bolts , clamps , brackets , braces , etc . ) , meeting the vendor requirements specified on the QPL Drawings . Attach the sign to the sign support using hardware meeting the manufacturer ' s recommendations and as specified in the Design Standards . Provide Federal Highway Administration ' s (FHWA) accepted sign substrate for use with accepted sign stands on the National Highway System (NHS) under the provisions of the National Cooperative Highway Research Program (NCHRP) Report 350 "Recommended Procedures for the Safety Performance Evaluation of Highway Features . " 102-9 .3 Business Signs : Provide and place signs in accordance with the plans and Design Standards . Furnish signs having retroreflective sheeting meeting the requirements of Section 990 . -28 - FPID ( S ) : 423186 - 1 - 58 - 01