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r <br />B <br />1 <br />12" Min. <br />} Carefully <br />Tamped Backfill <br />/ <br />l I= I i - 1 ... \ (Select) <br />T <br />1/4 D, 4" Min. <br />Plain or Reinforced <br />Concrete Cradle <br />Class "A" <br />(Concrete Cradle) <br />L. F. = 2.8 <br />1 \4 D, . <br />B <br />inular <br />Material <br />Class "B" <br />(Granular Base) <br />L.F. =1.9 <br />Loose Backfill <br />Vin. <br />-efully Compacted <br />ect Backfill <br />Bottom Unshaped Bottom <br />Class "D" <br />(Flat Bottom) <br />L. F. = 1.1 <br />Pip Bedding <br />Notes: <br />1. For rock or other incompressible materials, the trench shall be overexcavated a minimum of 6" <br />and refilled with granular bedding material as defined by class "B" bedding. <br />2. L. F. = Load Factor <br />3. Class "D" bedding will not be acceptable under any condition. <br />4. Minimum density for carefully compacted select backfill shall be 95% of STD. Proctor density or <br />as specified for the trench backfill, whichever is greater. <br />Construction ENVIRO -AG Enviro -Ag Engineering, Inc. <br />ENGINEERING CONSULTANTS <br />Standards Pipe Bedding = 3404AIM <br />_- <br />AM <br />_- _ _= ARILLO, TEXAS 79118 <br />fNG /Y££1? /NG, /NC. TEL (806) 3538123 FAX (806) 3534132 <br />Class "C" <br />(Shaped Bottom) <br />L.F. =1.5 <br />