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pavement loads it will support. We recommend oversizing (widening) the excavation 1 <br /> foot horizontally beyond the outer edges of the perimeter concrete curb for each foot the <br /> excavation extends below the bottom of the desired pad elevation(1H:1V oversizing). <br /> Fill placed to attain pavement subgrade elevation can consist of the on-site sandy lean clay <br /> and silty sand soils provided it is free of organic topsoil material or other deleterious <br /> materiaLs. We recommend compacting the backfiill at moisture contents within a range of <br /> 1 percentage point above and 3 percentage points below its optimum moisture content. <br /> The fill and backfill should be compacted to a minimum of 95 percent of its standard <br /> Proctor maximum dry density with the upper 3 feet compacted to at least 100 percent of <br /> standard Proctor.. <br /> Prior to placing the aggregate base(Class 5)we recommend proof rolling the pavement <br /> subgrade with a loaded tandem truck to identify soft,weak,loose or unstable areas that <br /> may require additional sub-cuts. <br /> R-Value testing was beyond the scope of this project. The soil borings mainly encountered <br /> native soiLs consisting of predominanfly of sandy lean clay conesponding to the ASTM <br /> Classifications CL. We recommend using an R-Value of 10 for pavement design. <br /> We recornmend the proposed pavement section in car parlcing areas consist of 3 inches of <br /> bituminous wear and 8 inches of aggregate base. In drive lanes with some truck traffic, <br /> we recommend the pavement section be increased to 31/s inches of bituminous weaz and <br /> 10 inches of aggregate base. <br /> We recommend aggregate base meeting MN/DOT specification 3138 for Class 5 aggregate <br /> base. We recommend the aggregate base be compacted to 100 percent of its maxunum <br /> standard Proctor dry density. <br /> We recommend that the bituminous wear and base courses meet the requirement of <br /> MN/DOT specification 2360.We recommend the bituminous pavements be compacted to <br /> at least 92% of the maximum theoretical density. <br /> We recommend specifying concrete that has a min;mum 2g day compressive strength of <br /> 3,900 psi.We recommend specifying 5 to 8 percent entrained air for exposed concrete to <br /> provide resistance to freeze-thaw deterioration. We recommend slump, air content and <br /> compressive strength test of Portland cement concrete. <br /> 4.4 Utilities <br /> We anticipate that the storm sewer utiliiies will be supported generally on native clayey <br /> glacial till soils which in our opinion aze suitable for pipe support. We recommend <br /> removing all e�dsting vegetation, topsoil, soft or other unsuitable soils, if encountered, <br /> beneath utilities prior to placement. <br /> We recommend bedding material be thoroughly compacted around the pipes. We <br /> recommend trench backfill above the pipes be compacted to a uinim� of 95 percent <br /> beneath pavements,the exception being within 3 feet of the proposed pavement subgrade, <br /> where 100 percent of standard Proctor density is required. In landscaped areas we <br /> recommend a xrLnimum compaction of 90 percent. <br /> 5 <br />