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Boring No. <br />Bituminous <br />Asphalt <br />Thickness <br />(inches) <br />Aggregate <br />Base <br />Thickness <br />(inches) <br />Subgrade Soils <br />(Upper 3 feet) <br />PB -5 <br />4 <br />9 <br />Fill (Sand with Silt, Silty Sand) <br />PB -6 <br />4 <br />10 <br />Fill (Sand with Gravel), Silty Sand <br />PB -7 <br />4 <br />12 <br />Fill (Sand with Gravel), Silty Sand <br />PB -8 <br />4 <br />10 <br />Fill (Sand with Gravel), Silty Sand <br />PB -9 <br />4 <br />10 <br />Fill (Sand with Gravel), Silty Sand <br />PB -10 <br />4 <br />10 <br />Fill (Sand with Silt), Silty Sand <br />PB -11 <br />4 <br />10 <br />Fill (Sand with Silt), Silty Sand <br />PB -12 <br />4 <br />9 <br />Fill (Sand with Silt), Silty Sand <br />PB -13 <br />5 <br />12 <br />Fill (Sand with Silt, Silty Sand), Peat <br />PB -14 <br />4 <br />10 <br />Fill (Sand with Silt), Silty Sand <br />PB -15 <br />4 <br />10 <br />Fill (Sand with Silt), Silty Sand <br />PB -16 <br />4'/2 <br />10 <br />Fill (Sand with Silt), Silty Sand <br />PB -17 <br />4'/2 <br />10 <br />Fill (Sand with Silt), Silty Sand <br />PB -18 <br />4'/2 <br />10 <br />Fill (Sand with Silt), Silty Sand <br />PB -28 <br />4 <br />6 <br />Fill (Sand with Gravel, Silty Sand <br />Once the site has been prepared as recommended, we anticipate the prepared subgrade soils will consist <br />mostly of sands with silt and silty sands. These soils would have R -values ranging from 20 to 70. We <br />recommend using an R -value of 30 for design purposes. <br />The MnDOT traffic data website indicates that the traffic loads are approximately 400 vehicles per day for <br />Oneka Lake Boulevard and 210 vehicles per day for Harrow Avenue. Our design is based on a 3.2% <br />increase in volume over the twenty (20) year design life of the pavement section. <br />Based on the traffic ADT we used the MinniESAL Traffic Forecast Program to calculate the roadway <br />traffic to be equivalent to approximately 51,000 Equivalent Single Axle Loads (ESAL's) for Oneka Lake <br />Boulevard and 25,000 ESAL's for Harrow Avenue. We recommend using 50,000 ESAL's as the minimum <br />for design. <br />Based on MnDOT's FlexPave excel design utilizing granular equivalent charts, we recommend the <br />pavement sections in Table 4 for Oneka Lake Boulevard. <br />Table 4: Oneka Lake Boulevard - Recommended Flexible Pavement Section <br />Section <br />Thickness (inches) <br />Bituminous Wear Course, MnDOT 2360 <br />3 <br />MnDOT Class 5 Aggregate Base - Reclaim <br />8 <br />Based on MnDOT's FlexPave excel design utilizing granular equivalent charts, we recommend the <br />pavement sections in Table 5 for Harrow Avenue. <br />Geotechnical Report <br />Oneka Lake Boulevard and Harrow Avenue Improvements <br />Hugo, Minnesota <br />WSB Project No. 010893-000 <br />Page 7 <br />