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, <br /> Mr. David Klein 2 October 7, 1998 <br /> GME Project No. 7940 <br /> lower wall having a height of 4 feet and the upper wall a height of <br /> 3 feet . The horizontal distance between the two walls will be 3 to 4 <br /> feet . The grade in front of the slab wall will be horizontal . These <br /> walls are cut into the existing hillside which consists of stiff <br /> sandy clay. The grade in front of the boulder walls will range from <br /> horizontal to no steeper than 4 horizontal : 1 vertical . <br /> Soil borings have not been performed for this project . However, <br /> based on our site observations and our observation of the exposed <br /> soil in the cut hillside at the location of the limestone slab <br /> wall/cul-de-sac, we assume that the foundation and retaining soils <br /> will consist of stiff sandy clay glacial till . <br /> Design Recommendations <br /> Since specific soil testing has not been performed, we have had to <br /> make assumptions concerning the engineering properties of the <br /> existing soils . We assume that the soils retained by the walls will <br /> consist of stiff sandy clay having a drained friction angle of 27° <br /> and a maximum moist unit weight of 125 pounds per cubic foot . We <br /> also assume that the soils would have a net allowable bearing <br /> capacity of at least 2000 pounds per square foot . <br /> GME CONSULTANTS,INC. <br />