The Director of Public Works shall have authority to adopt reasonable rules and regulations to clarify, interpret and enforce the provisions of this Chapter. The Director of Public Works may approve variations when such variations are not detrimental to the life, health, safety or welfare of the public and are necessary because of particular or peculiar circumstances, and will achieve the same level of protection as the original condition. Variations of the environmental conditions shall be applied for and processed in the same manner as other grading variations.