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Mr. David Klein 3 October 7, 1998 <br /> GME Project No. 7940 <br /> Included with this report are representative cross-sections of the <br /> boulder wall and the limestone slab wall . Geogrid reinforcement is <br /> required within the backfill behind all walls for this project . We <br /> understand that you plan to use Huesker Fortrac 35/20-20 geogrid. <br /> Boulder Wall Construction <br /> We recommend that the geogrid be placed at a maximum vertical <br /> separation of 2 feet between layers . The geogrid lengths should be <br /> equal to or greater than the exposed wall height at that particular <br /> location. Each geogrid layer should extend out of the compacted <br /> backfill and should be wrapped up along the face the 2 foot <br /> distance . The geogrid should then be placed back into the reinforced <br /> zone to provide a minimum overlap of 3 feet . (Please refer to the <br /> attached cross section drawing. ) This will form a "wrapped face" <br /> wall, onto which will be placed the boulder facing. The wrapped face <br /> should be inclined 5 degrees from vertical, or flatter. <br /> On the inside of the geogrid layer along the wall face and extending <br /> back into the backfill no more than 1 foot we recommend placing a <br /> layer of geotextile filter fabric to prevent migration of the soil <br /> out of the backfill and through the wall facing. Within 1 foot of <br /> the back of the geogrid wrapped face, and extending vertically up <br /> GME CONSULTANTS,INC. <br />