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r Mr. Dale Gustafson <br />October 11, 1994 <br />Page 5 <br />The geogrids should be installed such that the along-the-roll-length 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 face <br />movement or bulging is dependent on minimizing the slack. To minimize slack, we recommend <br />that the geogrid be pretensioned prior to backfilling. Pretensioning typically consists of layering <br />the geogrid flat, pulling band taut, anchoring with a two-prong metal fork, and then placing <br />backfill material on top. <br />Good drainage of tlie wall backfill is important for wall stability. We recommend a minimum <br />4" draintile in the gravel backfill as you have shown on year plans furnished to us. <br />Typical section details we recommend are attached. <br />Our design recommendations are based on certain assumptions regarding existing soil conditions. <br />In order to verify 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 />■iiio <br />Donovan K. Stormoe, PE <br />Principal <br />MN Reg. #10493 <br />Jamie^ C. Rudd, PE <br />:ipal Engineer <br />James <br />Priddii <br />I herc'by cartify that Ihfs p(an,.epcdiici:t!s:^, er <br />repoa was preparEd by mo or under my <br />tuo«vis!su dnd tfcaf I aco u <tuJy R.-:c‘strr<id <br />DKS/JCR/sm <br />Attachments <br />Prcv«sstcnai Engineer oncisr <br />O'. ‘W " <br />he Stcio <br />K<StOmCB <br />ROg. No. 10403