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� <br /> � <br /> � �xcavate trenches to de th indicated oc required. Carrv depth of trenches•fo� DipinQ to <br /> P <br /> establish indicated flow lines and invert elevations. <br /> � <br /> Where rock is encountered, carry excavation 6" below required elevation and backfill <br /> with a 6" layer of crushed stone or gravel prior to installation of pipe. <br /> � � For pipes oc conduit 5" or less in nominal size and for flat-bottomed multiple-duct <br /> conduit units, do not excavate beyond indicated depths. Hand excavate bottom cut to <br /> � . accurate elevations and support pipe or conduit on undistributed soil. <br /> For pipes or conduit 6" or larger in nominal size, tanks a�d other,mechanical/electrical <br /> work indicated to receive subbase, excavate to sulibase depth indicated, oc, if not <br /> ' otherwise indicated, to 6" below bottom of work to be supported. <br /> ' <br /> Grade bottoms of trenches as indicated, notching under pipe bells to provide solid <br /> bearing for entire body of pipe. <br /> � Backfill trenches with concrete where �trench excavations pass within 18" of column or <br /> wall footings and which are carried below bottom of such footinqs, or which pass under <br /> � wall footinRs. Place concrete to level of bottom of adjacent footing. <br /> Concrete is specified in Division 3. <br /> � Do not backfili trenches until tesrts ,and inspections have been made and badcfilling <br /> authorized by Architect/Engineer. Use care in backfllling to avoid damage or <br /> displacement of pipe systems. <br /> ' For piping or conduit less than 2'-6" below surface of roadways, provide 4" thick concrete <br /> base slab support. After installation and testinq of piping or conduit, provide minimum <br /> ' 4" thick encasement (sides and top) of concrete prior to backfilling oc placement of <br /> roadway subbase. . <br /> Cold Weather Protection: Protect excavation bottoms against freezing when <br /> L atmospheric temperature is less than 40 degrees F. Do not place frozen materials and do <br /> not place material on frozen subgrades. <br /> Clearin� and �rubbinp within the construction limits will be governed by Mn/DOT Section <br /> �' 2101. All trees, stumps, shrubs and other vegeta#ion removed within tfie construction <br /> limits to he hauled away from the site at the Contractor's expense. <br /> � No materials will be buried or burned within the construction limits. <br /> 3.02 COMPACTION: <br /> � . <br /> EARTHWORK 02200 - 5 <br /> , <br /> , <br />