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ST□At~@ Stork Twin City Testing Corporation Materials Technology Proposed New Residence at 1635 Bohns Point Road Orono, Minnesota Stork Twin City Testing Corporation Project #TCT006405P Page 9 of 11 All backfill in underground utility trenches should be placed and compacted in thin lifts. Utility trench backfill in paved areas should be compacted to 100% of the Standard Proctor value in the upper three feet of subgrade and to a minimum of 95% below three feet. 4.6 Foundation Walls Backfill placed against the below-grade foundation walls will exert lateral loads against these walls. The lateral loads could be minimized if free-draining granular soils are used as backfill immediately against the walls. This would include sands classified as SP or SP-SM, containing no more than 10% material passing the #200 sieve, and preferably no more than 50% passing the #40 sieve. The granular backfill should extend at least two feet laterally from the bottom of the foundation walls and extend outward at a 30-degree angle to the surface. In areas that will support structures such as sidewalks or slabs, the exterior fill should be compacted to 95% of Standard Proctor density. Backfill under paved areas should be compacted to 100% of the Standard Proctor in the upper three feet. This report is being prepared assuming no below grade basement wall construction will be performed where the walls will be designed to retain soil lateral earth pressures. For foundation wall construction we recommend backfilling the interior and exterior walls simultaneously to minimize lateral soil pressure on the walls. If basement walls will be constructed for this project, we should be consulted for providing lateral earth pressure design information. fnformal.Ion and statements in this report ate derived from material, infonnation and/Of specifications furnished by the client and exclude any expressed or implied warranties as to the fitness of lhe malelia! te-.sted or analyzed for any particular purpose or use. This certificate or report Is the confidential property of our Client and may not be used ror advertising purposes. This certificate or report shall not be repraduccd except in 1ull, without written approval or Uiis laboratory and shall be signed or otherwise approved by authorized staff members only. The reooftling of false, ficffl:ious or fraudulent statements or entries on this document may be punished as a felony under Pederal Statues inciudlng Fede rat Law Title 16, Chapter 47. This document contains technical i:lata whose export and re~exportlre-transfer is subject to c;ontrof by the U.S. Department of Commerce under the Export Administration Act and the E:xport Administration Regulations. The depar1ment of Commerce's prior written approva'i is required for the ex part or re-ID;port/re- transfer of sl.Klh technical informa:Hon to any foreign person, foreign entity or foreign organization whelher in the Uni1ed states or abtoad. EAR-CONTROLLED DATA