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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />November 13,2006 <br />Project 06-507 A <br />2007 Street Reconstruction <br />lrving A venue Area Improvements <br />Elk River, Minnesota <br /> <br />D698). Any fill placed in the top 3 feet of the road subgrade should be compacted to at <br />least 100% of standard proctor maximum density. All fill and utility trench backfill <br />material should be compacted ata moisture content within plus or minus 2% of the <br />optimum moisture as determined by a standard proctor. We recommend compaction tests <br />be taken at a minimum rate of one test per two feet of fill per 200 linear feet of the utility <br />trench backfill, roadway sub grade, and aggregate base material. <br /> <br />E. Pavement Recommendations <br /> <br />- <br />The expected subgrade soils in the Irving Avenue Area consist of poorly graded saftds <br />with silt eSP-SM) and clean, poorly graded sand eSP) outwash soils. These soils are <br />classified as A-l-b and A-3soils in accordance with the American Association of State <br />Highway Transportation Officials (AASHTO) classification system. A-l-b and A-3 soils <br />are rated excellent material for use as roadway sub grade material. Without benefit of a <br />laboratory R-value determination and based on Mn/DOT guidelines, an R-value of 70 can <br />be assumed for the onsite soils. The laboratory R-value test is expected to confirm this. <br /> <br />Based on an assumed R-value of70, we recommend the following bituminous pavement <br />section for low-volume, residential streets: <br /> <br />Thickness <br />1.5" <br />2.0" <br />6.0" <br />9.5" <br /> <br />CourselDescription <br />Mn/DOT 2360 LV -3 Wear Course <br />Mn/DOT2360 LV-3 Non-Wear Course <br />Mn/DOT 313 8 Class 5 or 6 Aggregate Base <br />TOTAL <br /> <br />G.E. <br />3.4" <br />4.5" <br />6.0" <br />13.9" <br /> <br />Page 7 <br />