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The neat -surface 'soils encountered- betoW the' asphalt and gravel fill are predominantly clay. <br />Laboratory test results indicate that the near -surface clay has a medium expansion potential as <br />defined by the Uniform Building Code. Special considerations for this level of expansion potential <br />have been incorporated into the recommendations presented herein for Foundation Design <br />(Section 6. 1), Concrete Floor Slab -on -Grade (Section 6.2), Tentative Pavement Design (Section <br />6.8) and Site Grading (Section 6.9). <br />6.5 WATER SOLUBLE SULFATES <br />Chemical analysis analyses conducted on a sample of the near -surface materials indicates a <br />negligible level (7.3 ppm) of water soluble sulfate as defined by the Uniform Building Cade <br />(UBC). As a result, sulfate resistant concrete does not appear to be necessary for this project. <br />Although pertinent grading information is currently unavailable, no permanent slopes higher than <br />two feet are anticipated for the project. For slopes up to two feet in height, a 2:1 (horizontal to <br />vertical) slope inclination is recommended. For higher slopes or different configuration, a slope <br />stability evaluation should be conducted to evaluate stability. Proper drainage for all slopes should <br />be provided and maintained to ensure long-term stability. <br />Due to the cohesionless nature of the near surface soils, surficial unstability and erosion of <br />permanent slopes should be anticipated. Slope face erosion may be reduced by either paving the <br />slope or by planting vegetation and providing positive drainage away from the slope by including <br />berms at the top of the slope, and concrete -lined drainage ditches to conduct water down and away <br />from the slope. <br />6.7.1 Anchoring of Underground Storage Tanks (UST) <br />It is expected that the bottoms of the underground storage tanks will extend below the level of the <br />shallow groundwater. As a result, the design and installation of the tanks should include provisions <br />such as concrete anchors or deadmen for resisting buoyant uplift forces. <br />JN 40007.095-01 <br />Ihg\navA97-06jwi\a"po.doc <br />6-3 <br />