04/25/96 Agenda & Packet - Laserfiche WebLink

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