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' e determination of then necessity e essity for and the extent of additional excavation <br /> shall be made by the Engineer, who shall inform the Contractor in writing <br /> ' regarding such necessity and the extent. This excavation shall then be backfilled to <br /> the appropriate grade with Type 1 or Type 3 backfill material , placed in 8 inch <br /> layers and compacted to a density equal to 100 percent of the maximum density as <br /> ' determined by AASHTO T480 . <br /> B . Installation of drainage structures shall conform to the details as shown on the <br /> ' Drawings and, unless otherwise specified, shall conform with Section 425 of the <br /> 1986 Edition of the Florida D . O . T. Standard Specifications for Road and Bridge <br /> Construction. Backfill shall be placed in lifts not to exceed 12 inches loose depth <br /> and compacted to 95 percent of maximum density per AASHTO T480 in unpaved <br /> areas and to required subgrade density in areas of paving or curbing . <br /> C . Backfill shall not be placed against cast-in-place concrete structures until the <br /> concrete has attained sufficient strength to resist the load without damage, and in <br /> no case , less than seven days after the concrete was placed. <br /> 12 . AS-BUILT DRAWINGS <br /> A . During the installation of Drainage Pipe and Structures the Contractor shall keep <br /> accurate records of the As-Built construction showing the location of all changes in <br /> alignment, services , utility crossings , and similar data. Items shall be located from <br /> tpermanent objects such as centerline of street, manholes, valves, etc . Upon <br /> completion of the project the Contractor shall deliver to the Engineer an As-Built <br /> Drawing showing the above information. <br /> 1 <br /> C : \ Down1oad \ techspec - 02403 . doc 02403 - 9 <br />