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Mr. Dale Gustafson <br />October 11. 1994 <br />Page 5 <br />The geogrids should be installed such that the along-the-roll-lencth direction is perpendicular to <br />the wall face. <br />Care should be taken to prevent wrinkles or slack in the geogrid layers. The amount of tace <br />movement or bulging is dependent on minimizing the slack. To minimize slack, we recommend <br />that the geogrid be pretensioned prior to backfilling. Pretensicning typically consists of layering <br />the geogrid flat, pulling hand taut, anchonng with a two-prong metal fork, and then placing <br />backfill material on top. <br />Good drainage of the wall backfill is important for wall stability. We recommend a minimum <br />4" drainiile in the gravel backfill as you have showm on your plans furnished to us. <br />Typical section details we recommend are attached. <br />Our desi ’ >: > ‘commendations are based on certain assumptions regarding existing soil conditions, <br />jjj order to v'erify our assumptions, we recommend that an experienced soils engineer or <br />technician from AET be on site during construction to observe conditions. As a minimum, the <br />engineer should observe base excavations, backfilling procedures, and geogrid installation. <br />If you anticipate changes from our recommendations, please contact us so we can review the <br />impact of those changes on our recommendations for this wall system. <br />Report Prepared By;Report Reviewed By: <br />Donovan K. Stormoe. PE <br />Principal <br />MN Reg. i? 10493 <br />DKS/JCR.'sm <br />Attachments <br />I hereby earti-y tli3t thh plan,. or <br />f«.*poit \‘/as prepared ay ir.o or un-icr my <br />rv.'><ir.(is!co <nd phat 1 aaa a ea.’'/ sr^f^ci <br />Pf«i.>soicoal Engineer unebr th^u'.vs^ ti.e Sim-'* <br />O'. Mlnoi^aa. <br />WHiTi/tw rC, <br />r> <br />DCl <br />/O/f/if I _neg. No. 10403