2005-P09263 - land alteration - Laserfiche WebLink

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. ' , Mr.Ray Newkirk Wayzata,Minnesota Pmject No. 95286 ptaced c�crete wall would require steel reinforcement, a poured footing and potentiatly steel helical anchor tiebacks. The footing would have to be supparted on firm ground. Because of the runoff potential that may still occur near the upper portion of the slope, we recommend that a drainage system be inclvded in the Anchor Wal1 design The Anchor Highland block is constructed from stacked dry-cast units(without mortar). The btock facing is combined with horizontat layers of geogrid reinforcement which extend back into the soil. The combination of the weight, width and batter of the block with the high tensile sfir�ngth of the geogrid reinforcement creates the retaining wall effcct. Geogrid reinforcement materials are high tensile strengEh polymeric s�heet materials. The geogrid extends through the interface between the modular btock and into the soil to create a composite gravity mass structure. Attached is a drawing provided by the Nativnal Concrete Masonry Associatioa which depicts a reinforced soil segmental retaining wall (SRV�. We recommend that any geogrid reinforced modular block n�taining wall be supported on a cnished gravel basc supported on a firm foundation. The intent of the wall would be to allow regrading which could then help to reduce the amount of wat�r entering the slope area. Adequate support for the wall would be of utmost concern and should be evaluated by the walUslope builder and his enginecring liaison. Reinfarced So�l Slope(1� Another repair option would be to construct a geogrid reuiforced soil slope (RSS). This option zs similar to the moduiar block n�taining wall discussed above,howevcr,instead of concrete blocks, the slope face can be s�ded and fertilized for a more natural appearance. Geogrids are employed to provide high tensile strength reinforcement withirr the stope to help resist shear failure. Also, the RSS optioa atlows for more flexibility in the constructed stope angle,whereas modulair blvcks are sta�ked at a given setback. Itock TrencL Drain This cietail should be used in conjunction with one of the above repair options. It is axat suitable as the sole repair option for the landslide. It should be unpottant to develop a drainage pmgram that will divert water and ninoff away from the slope. This progxam should be a part of any r�ir/r�conskvction option instituted. Drains should be extended past the landslide area to the west and east. A trench would be constructed behind the c�rest of the slope and filled with coarse, free-draining aggregat�. The tc+�nch should be graded to capture and direct nmoff away from t�crest and around the slope. The te�nch e�rails could be laned with a Mn/llOT Specificatiom 3'�33 Type�geot�xtile. ADDITI4NA�.Wt? We recominend#i�e follov�n�be performed prior to�iizing a a�pair. 5ub�urf�ce Ezploratiom A driDl rig should be mabiiizeci to the sitc to perforan soil borings at the top of the stopc and potentialiy at the base. T'hese boring�would be n�essary in order to define the sogl Ga1e-Tec Engineering,Inc.,SEP'I'EMBEFt, 20�5 �