i) Material classified by the AASHTO Soil Classification System as A-1, A-2, or A-3, having a maximum of 35 percent of the material passing the number 200 sieve, and having a CBR equal to or greater than 8. ii) Material not meeting the above requirements for AASHTO Classification and gradation but having a CBR equal to or greater than 8 and a Liquid Limit and Plasticity Index of less than or equal to 40 and 15, respectively. iii) Material not meeting the above requirements for liquid limit and plasticity index may be used if chemically modified by the use of lime, fly ash, or cement. The type and amount of treatment shall be determined by a material testing lab approved by the City. The chemically modified soil must meet all requirements of Section 2 above.
