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5 <br />The underlying river cobble that is proposed to be mined is a well graded <br />gravel with silt sand and cobbles. It has an ASTM classification of "GW'. The <br />tested properties for this sample are as follows: <br />LL = NA <br />PL = NP <br />PI=NA <br />Passing 3" sieve = 25% <br />Passing #4 sieve = 25% <br />Passing #10 sieve = 25% <br />Passing #40 sieve = 15% <br />Passing 200 sieve = 5% <br />2. Geologic Hazards: Mined slopes have potential to fail <br />3. Potential Unstable Slopes: No existing unstable slopes were noted. The <br />mined slopes may become unstable as they are excavated. <br />4. Swell Potential: The site's CL soil type has a moderate swell characteristic. <br />The site's GW soil type has a low swell characteristic. <br />5. Consolidation Potential: The CL soil type has a moderate consolidation <br />characteristic. The site's GW soil type has a low consolidation characteristic. <br />6. Water Table: Standing water is found just below the top of the gravel layer. <br />This hieght is typically near 4589. <br />7. Corrosivity :The site's CL soil type has a moderate to high corrosion <br />characteristic. <br />8. Rock Outcrops: None noted. <br />9. Gamma Radiation: Gamma radiation was not measured. <br />B. Grading and Excavation of Slopes <br />1. Potential Construction Difficulties: No potential construction difficulties are <br />anticipated. <br />2. Slope Excavation: Slopes excavated in the "CL" type soil <br />C. Retained Earth Information <br />1. Lateral Earth Pressures: No retaining features are anticipated. <br />2. Coefficient of Friction to Lateral Movement: The coefficient of friction for the <br />"CL" type soil is typically in the range of 0.3 - 0.6 and is a function of <br />