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PN: 50663GE <br />November 20, 2006 <br />The moisture conditioned soil should be placed in lifts that do not exceed the capabilities of the <br />compaction equipment used and compacted to at least ninety (90) percent of maximum dry <br />density as defined by ASTM DI557, modified Proctor test. We typically recommend a <br />maximum fill lift thickness of six (6) inches for hand operated equipment and eight (8) to ten <br />(10) inches for lazger equipment. Care should be exercised in placement of utility trench backfill <br />so that the compaction operations do not damage the underlying utilities. <br />8.1.3 Granular Compacted Structural Fill <br />Granular compacted structural fill is referenced in numerous locations throughout the text of <br />this report. Granulaz compacted structural fill should be constructed using an imported <br />commercially produced rock product such as aggregate road base. Many products other than <br />road base, such as clean aggregate or select crusher fines maybe suitable, depending on the <br />intended use. If a specification is needed by the design professional for development of project <br />specifications, amaterial conforming to the Colorado Department of Transportation "Class 6" <br />aggregate road base material can be specified. This specification can include an option for <br />testing and approval in the event the contractor's desired material does not conform to the <br />Class 6 aggregate specifications. <br />All compacted structural fill should be moisture conditioned and compacted to at least ninety <br />(90) percent of maximum dry density as defined by ASTM D 1557, modified Proctor test. Areas <br />where the structural fill will support traffic loads under concrete slabs or asphalt concrete should <br />be compacted to at least ninety-five (95) percent of maximum dry density as defined by ASTM <br />DI557, modified Proctor test. <br />8.2 Excavation Considerations <br />Unless a specific classification is performed, the site soils should be considered as an <br />Occupational Safety and Health Administration (OSHA) Type C soil and should be sloped and/or <br />benched according to the current OSHA regulations. Excavations should be sloped and benched <br />to prevent wall collapse. Daily observations of the excavations should be conducted by OSHA <br />competent site personnel to assess safety considerations. <br />We encountered subsurface water in our test borings. We should be contacted immediately if <br />subsurface water is encountered during construction. <br />If possible excavations should be constructed to allow for water flow from the excavation the <br />event of precipitation during construction. If this is not possible it may be necessary to remove <br />water from snowmelt or precipitation from the foundation excavations to help reduce the <br />influence of this water on the soil support conditions and the site construction characteristics. <br />21 TRAUTNER ~ <br />A DIVISION OF TRIGONf~~3d <br />