During any aspect of site preparation, development or construction, if field conditions prove to be substantially different from conditions assumed by the design professional in the creation of a grading/stormwater management plan or grading/erosion control plan, such that stormwater or erosion controls may not function as planned, the design professional or owner may apply to the planning director for permission to make a minor modification in the plan. If the planning director finds that the modification is necessary and in substantial accord with the approved plan, the planning director shall notify the design professional or owner in writing, and construction can proceed. Any such minor modifications approved by the planning director shall be shown on the final drawings of the grading/stormwater management plan on file with the planning director. Any major modifications, as determined by the county engineer or planning director, shall be considered pursuant to the provisions for modifications of permits at section 12-266 of this title. (Ord. 501, 11-18-2008)