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M98168GE • • <br />If significant water concentration and velocity occurs erosion <br />may occur. Erosion protection may be considered to reduce soil <br />erosion potential. A landscape specialist or civil engineer should <br />be consulted for surface drainage design, erosion protection and <br />landscaping considerations. <br />12.0 LANDSCAPE IRRIGATION <br />We anticipate that landscaping will not be included in the <br />proposed site development. If in the future the plans include <br />landscaping we should be contacted to provide geotechnical <br />engineering suggestions and recommendations for landscape <br />irrigation. <br />13.0 SOIL CORROSIVITY TO CONCRETE <br />Chemical tests were performed on a sample of soil obtained during <br />the field study. The soil sample was tested for pH, water soluble <br />sulfates, and total dissolved salts. The results are presented in <br />Appendix B. The teat results indicate a water soluble sulfate <br />content of 104 parts per million. Based on the American Concrete <br />Institute (ACI) information, a water soluble sulfate content of 104 <br />parts per million indicates mild to moderate exposure to sulfate <br />attack on concrete. We suggest sulfate resistant cement be used in <br />concrete which will be in contact with the on site soils. American <br />Concrete Institute recommendations for sulfate resistant cement <br />based on the water soluble sulfate content should be used. The <br />American Concrete Institute recommends a maximum water/cement ratio <br />of 0.5 for concrete where moderate exposure to sulfate attack will <br />occur. <br />14.0 RADON CONSIDERATIONS <br />Our experience indicates that many of the soils in western <br />Colorado produce small quantities of radon gas. Radon gas may tend <br />to collect in closed poorly ventilated structures. Radon consider- <br />ations are presented in Appendix C. The radon considerations <br />presented in Appendix C are based on Environmental Protection <br />Agency guidelines for residential structures in areas where radon <br />gas is produced by the soils. These concepts for methods to reduce <br />radon gas accumulation in closed environments such as residential <br />or industrial structures provide guide lines which are appropriate <br />for work areas as well as residential areas. <br />20 <br />~tambert ana ~~~ociateo <br />COMWlTIYO GlOTlCMMIL~I IYGIM!!M HMO <br />Y~Tl~I~I TlOTIMO <br />