Except as otherwise provided in this chapter, no person convicted of a felony or misdemeanor involving moral turpitude shall be eligible for employment in the excepted or competitive service of the city; provided, however, that the appointing authority may disregard such conviction if he finds and determines that mitigating circumstances exist, such as but not limited to evidence of rehabilitation, length of time elapsed since such conviction, the age of such person at the time of conviction, or the fact that the classification applied for is unrelated to such conviction. (Ord. 263 §l, 1979).