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ell I <br /> Keep to a minimum the clearing and grubbing, and trimming of trees as necessary to construct <br /> the walls . <br /> B . Do not mix wall types or colors at any one site . Install the walls in accordance with the <br /> Plans , and in accordance with shop drawings submitted to and approved by the Engineer. Secure <br /> joints and connections in such a manner as to be structurally sound and without visible openings <br /> in the system allowing sound transmission . Ensure metal walls do not produce a secondary 1 <br /> source of noise transmission due to vibration . <br /> C . Repair marred, chipped, scratched, or spalled areas of walls at no expense to the <br /> Department in accordance with the manufacturer ' s recommendations or at the Engineer ' s <br /> direction . <br /> D . The Contractor may substitute welded for fixed bolt connections or vice versa on ° <br /> metal walls , where applicable, provided load calculations are submitted for the specific modified <br /> connection and uses a minimum safety factor of 3 . 0 . <br /> E . Place trench backfill for wall construction in accordance with 125 - 8 . Use select <br /> materials for the trench backfill . <br /> If, in the opinion of the Engineer, the trench is too narrow to compact, backfill the <br /> trench excavation with flowable fill meeting the requirements of Section 121 or concrete meeting <br /> the requirements of Section 346 or 347 to the satisfaction of the Engineer at no expense to the Li <br /> Department . <br /> F . Dispose of all excess excavation in a manner satisfactory to the Engineer. <br /> G . Keep right-of-way fence that is scheduled to be salvaged in place until completing the <br /> p. <br /> wall or, in the opinion of the Engineer, as long as possible . . <br /> H . After erecting the wall, leave the disturbed area in a finished condition at the direction k <br /> of the Engineer, and grass or sod the area as indicated in the Plans . <br /> I . Erection Tolerances : <br /> 1 . Variation from plumb : plus or minus 1 /4 inch/ post height <br /> 2 . Panel alignment : plus or minus 1 /4 inch <br /> 3 . Top of panel elevation : plus or minus3 /4 inch <br /> 4 . Elevation difference of adjacent panels : plus or minus 1 /2 inch <br /> 5 . Joint taper over panel length : plus or minus 1 /2 inch <br /> 6 . Top of collar elevation : plus or minus3 /4 inch <br /> 7 . Post placement : <br /> a. Variation from specified location plus or minus 1 /2 inch " <br /> b . variation from specified elevation plus or minus 1 /4 inch <br /> 8 . Continuity of graphics , fracture fins , etc across joints : 1 /4 inch <br /> J . When building sound barriers on top of earth berms , construct the berms of fill material <br /> compacted to 95 % of the maximum density as determined by AASHTO T 99 . re <br /> K. Provide the concrete wall (Precast or Cast-in- Place) with a uniform color, pattern , and <br /> texture . <br /> 534-7 Test Wall. 1 <br /> Erect a test wall section not less than 50 feet in length before starting general wall <br /> construction at the project site . The Engineer will use the erection of the test wall to determine if <br /> the Contractor ' s methods and equipment are sufficient to produce a sound barrier that meets the <br /> requirements of the Contract Documents . The Contractor may revise his methods and equipment <br /> as necessary , at any time during the positioning of the test wall, in order to satisfactorily meet all E <br /> - 153 - <br /> FPID ( S ) : 423186 - 1 - 58 - 01 <br /> P <br /> I lee <br />