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Wayzata Country Club Project BL-08-03640 September 29, 2008 Page 8 material may consist of sand, silty sand, clayey sand, sandy lean clay,or lean clay. We recommend, however,that the plastic index of these materials not exceed 15, in part for drainage considerations. As mentioned in Section C.2., we recommend maximum lift thickness/fill heights be limited to 1 foot to minimize the potential to "shear" or fail the underlying peat. We recommend compacting backfill and fill to a minimum of 90 percent of its standard Proctor density. We estimated settlement of the peat with the addition of various thickness of new fill. Specifically,we estimated settlement based on adding 1, 2 1/2, and 5 feet of fill. Table 3 provides an estimate of the anticipated settlements in the deeper peat areas. Table 3. Summary of Estimated Settlement Height of Surcharge Estimated Settlement (feet) (inches) 1 3to6 2 1/2 6 to 12 5 24 to 36 The preceding recommendations are provided as a general introduction to surcharging. We are available for additional discussion and recommendations as plans and elevations are finalized. D.3. Peat Retainage Along the Creek A small creek is located adjacent to the west side of the 15th fairway. We understand the Wayzata Country Club desires to maintain the creek and the fairway along side it. The fill associated with the surcharge has the potential to displace the soils near the creek and the surcharge has the potential to encroach on the creek. Sheet piling may be used to retain or confine the surcharge. Table 4 provides soil parameters for sheet pile design. Table 4. Summary of Soil Parameters Equivalent Fluid Pressures(pcf/ft) AtRest Active Passive Unit Friction (Ko) (KA) (Kr) Weight Angle Soil Type (pcf)** (4) Wet Submerged Wet Submerged .'Wet Submerged Sand 125 32 60 30 35 20 400 180 Clay 130 28 70 35 45 25 360 160 BRAUN I NTE BTEC