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• AET #95-1343 - Page 8 <br /> s our recommendation that the in-place soils be subcut to at least 18" below final subgrade <br /> elevation, and preferably 2'. Subgrade elevation would be considered the bottom of the <br /> aggregate base layer. As soils in-place will likely be unstable, we recommend placement of a <br /> ;eotextile stabilization fabric which meets the requirements of a Type V fabric per MnDOT <br /> specification 3733. Because of the potential for wet subgrade conditions (before and after <br /> :onstruction), we recommend the resultant subgrade fill be comprised of a sand which contains <br /> Etss than 5% by weight passing the #200 sieve and less than 40% by weight passing the #40 <br /> ieve. This sand should be compacted to a minimum of 98% of the standard Proctor density <br /> ASTM:D698). <br /> )ur recommended pavement section thickness designs appear on the following table. The table <br /> rovides a design for a "10 year" pavement life and a "20 year" pavement life. This design is <br /> )ased on light duty usage (intended for automobile parking). <br /> • <br /> Material 10 Year Design 20 Year Design <br /> Bituminous Wear - Type 41 21/2" 11/2" <br /> • <br /> Bituminous Base - Type 31 - 11/2" <br /> Class 5 Aggregate Base (MnDOT 3138) 6" 6" <br /> SUBSURFACE EXPLORATION <br /> 'he subsurface exploration program consisted of four standard penetration test borings and one <br /> :fight auger boring, performed on March 29, 1995. The borings were preselected by our firm, <br /> s generally discussed with you. The actual locations were measured in the field, referenced <br /> ) the existing warming house. The final boring locations appear on the Boring Location sketch <br /> 7igure 1). Surface elevations shown on the boring logs were also measured by AET. These <br /> • <br />