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6 <br />moisture content. The coefficient of friction for the "GW" type soil is typically <br />in the range of 1.0. <br />D. Drainage and Irrigation <br />1. Permeability: The "CL" type soil permeability is nearly 5 x 10-8 cm/sec. The <br />"GW" type soil permeability is nearly 2.5 x 10 2 cm/sec. <br />2. Hydrologic Soil Group: The "CL" type soil is a "D" type soil, which has poor <br />infiltration rates when thoroughly wet. The "GW" type soil is a "A" type soil, <br />which has good infiltration rates when thoroughly wet. <br />;. Irrigation: Adjacent irrigation may detrimentally affect slope stability. <br />Therefore it is advisable to line or pipe nearby open irrigation ditches. This <br />procedure may be considered on a item by item basis by the engineer. <br />E. Borings <br />1. Ten geotechnical test boreholes were drilled on this site. <br />Recommendations <br />We recommend that the current plan be amended to reflect the setbacks set forth herein. <br />The appropriateness of these setbacks shall be field verfied by a professional engineer <br />on an ongoing basis. The setbacks may be reduced or increased on the basis of these site <br />inspections. Given the minimal nature of some setbacks, and given acceptance of this <br />report by Ephemeral Resources LLC, the minimal setbacks are approved upon the <br />condition that Ephemeral Resources LLC is willing to restore any disturbance to an <br />adjoining site to the original or better condition in a reasonable period of time. <br />Given the growth of residential housing in Grand Junction, it is further recommended that <br />signs be posted adjacent to each parcel indicating that a future mining area will exist. This <br />will give people the opportunity to plan for permanent man-made structures as based~on <br />any future mining process. These signs would be posted upon approval of the proposed <br />project. <br />