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SCE Santa Ana October 25,2019 Project No. 3.31634 Page 15 Asphalt binder to be mixed with the aggregate should conform to the provisions of Section 92, “Asphalts”, of the Standard Specifications and should be Performance Graded (PG) Asphalt Binder. HMA shall be compacted to 91-97%. Class II Aggregate Base shall all be compacted to a minimum of 95-percent of the material’s maximum dry density as determined by ASTM D1557. Class II Aggregate Base should conform to Section 26 of the CSS. Prepared subgrade shall be scarified and re-compacted to 95-percent. The subgrade shall be smooth and uniform, and true to the required grade and cross section. We recommend that any curbs and gutters be designed by the project civil engineer. For any proposed curbs and gutters, a minimum 4-inch section of reinforced concrete (minimum 2,500 psi) may be used. We suggest control joints, at appropriate intervals, as determined City of Santa Ana Standards and the project civil engineer. 17. CORROSION POTENTIAL Geochemical screening of the site soils was performed. The screening is meant to serve as an indicator for determining the level of input necessary from a qualified corrosion engineer. SGSI is not a corrosion consultant. Several governing agencies in Southern California require the geotechnical consultant to determine the corrosion potential of soils to buried concrete and metal facilities. We therefore present the results of our testing with regard to corrosion for the use of the client and other consultants, as they determine necessary. The National Association of Corrosion Engineers (NACE) defines corrosion as “deterioration of a substance or its properties because of a reaction with its environment.” From a geotechnical viewpoint, the “environment” is the prevailing foundation soils and the “substances” are reinforced concrete foundations or various types of metallic buried elements such as piles, pipes, etc., which are in contact with or within close vicinity of the soil. In general, soil environments that are detrimental to concrete have high concentrations of soluble sulfates and/or low pH values. Results of a laboratory corrosivity test conducted on a near surface sample yielded a soluble sulfate content of 399.3 ppm, a chloride content of 86.6 ppm, a pH value of 8.3, and an electrical resistivity of 4288 ohm-cm. 60 of 100 1327 S Grand Ave 12/12/2024