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KLE/NFELOER <br /> \\ J/Bright People.RIghY So7etFons. <br /> V <br /> both classes, concrete should have a minimum compressive strength of 2,500 psi and <br /> there is no restriction on the maximum water cement ratio used. If concrete is exposed to <br /> moisture and an external source of chlorides, the Exposure Severity and Class for <br /> corrosion protection of reinforcement are "Severe" and "C2". For C2 or Severe conditions <br /> concrete should have a minimum compressive strength of 5,000 psi and a maximum water <br /> cement ratio of 0.40. <br /> • According to the American Concrete Institute (ACI) 318-08, Table 4.2.1, the Exposure <br /> Severity is "not applicable" and the Exposure Class is "SO" for soils with a water-soluble <br /> sulfate content of less than 1,000 ppm. According to Table 4.3.1 of ACI 318-08, for an <br /> Exposure Class of "SO", there is no specification for maximum water cement ratio, and <br /> concrete should have a minimum compressive strength of 2,500 psi. <br /> The provided preliminary corrosion tests are only an indicator of potential soil corrosivity for the <br /> sample tested. Kleinfelder's scope of work did not include corrosion engineering. If more detailed <br /> information is required, it is recommended a competent corrosion engineer be retained to evaluate <br /> the corrosion potential of the site to proposed improvements, to recommend further testing as <br /> required, and to provide specific corrosion mitigation methods appropriate for the project. <br /> 20210067.001A/ST020R111447 Page 35 of 37 May 11, 2020 <br /> ©2020 Kleinfelder www.kleinfelder.com <br />