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Aug 26 04 07:56a Jon Whitcomb <br />PUG 25 '04 02:39PM 3RPL11 INTERTEC <br />D.S. Pavements <br />b.S.a. Subgr de Preparation. See Section D.1.a. <br />651 -430 -0029 <br />Wesley investments, Inc. <br />Project: SP -04 -03734 <br />May 21, 2004 <br />Page 8 <br />p. 13 <br />P. 13/23 <br />A.S. b. Test Roll_ Prior to placing the aggregate base, we recommend test rolling the pavement <br />areas with a loaded dump truck or other heavy vehicle. The purpose of the test roll is to check <br />for areas of loose or soft subgrade material that may require additional compaction or removal <br />and replacement with more stable material. We racomrendhaving the test roll procedure <br />observed by a geotechnical engineer or engineering technician. <br />D.S.c. Soil R- Value. For that portion of the roadway constructed on a subgrade comprised of <br />clayey glacial soils, we recommend using a soil R -value of 10 for pavement design. Where <br />significant falls are placed, the soil R -value will depend on the fill type used. <br />D.S,d_ Materials and Compaction. We recommend specifying crushed gravel base meeting the <br />requirements of Mn/DOT Specification 3138 for Class 5. We recommend that the bituminous <br />surface and base courses meet the requirements of Specification 2350, Type LV, <br />We recommend that the crushed gravel base be compacted to a minimum of 100 percent of the <br />standard Proctor maximum dry density. We recommend that the bituminous courses be <br />compacted to a minimum of 95 percent of their Marshall density. <br />D.C. /Utilities <br />D.6.a. Excavations. We recommend excavating organic materials from below proposed utility <br />pipes and structures and replacing them with compacted engineered bacIill. Utility pipes and <br />structures, therefore, would either be supported on the compacted engineered backfill placed <br />over glacial till, or on the glacial till itself. <br />tri our opinion, the underlying glacial till is suitable for support of the proposed utilities. If the <br />soils at invert grades become disturbed during excavation, they can lose strength. Disturbed soils <br />should be re- compacted, if possible, or subcut and replaced. <br />D.6. b. Dewatering. Depending on their depth and proposed design grades, excavations for <br />utilities may encounter groundwater. We recommend that the contractor review the utility plans, <br />noting utility depths in respect to anticipated g undrrter elevations, and, here applicable, <br />2, <br />make provisions for dewatering. <br />