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APR 7 195 10:Z0 FROM AM ENG TST ST PAUL TO 97843462 PAGE.00e <br />AET #95-1343 - Page 8 <br />is our rwommendauou 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 />geotexrile stabilization fabric which mews the requircments of a Type V fabric per MnDOT <br />Specification 3733. Because of the potential for wet subgrade conditions (before and after <br />construction), we recommend the resultant subgrade fill be comprised of a sand which contains <br />less than 5% by weight passing the #200 sieve and less than 40% by weight passing the #40 <br />sieve. This sand should be compacted to a minimum of 98% of the standard Proctor density <br />(ASTM:D698). <br />Our recommended pavement section thickness designs appear on the following table. The table <br />provides a design for a "10 year" pavement life and a "20 year" pavement life.- This design is <br />based on light duty usage (intended for automobile parking). <br />STTBSIWACE EXPLORATZOI�i <br />The subsurface exploration program consisted of four standard pe=MdOn test borings and one <br />flight auger boring, performed on March 29, 1995. The borings were preselected by our firm, <br />as generally discussed with you. The actual locations were measured in the field, referenced <br />to the existing warming house. The final boring locations appear on the Boring Location sketch <br />(Figure 1). Surface elevations shown on the boring logs were also measured by AET. These <br />