Preliminary grading plans provide for review and determination of grading requirements prior to approval of final plans and issuance of grading approval. Precise design at this stage is not required. The plans shall be clearly and legibly drawn and entitled "preliminary grading plan," and shall contain a statement of the purpose of the proposed grading, and shall include all of the information required in the Manual of Standards, Chapter 2, Section 2. (Prior code § 9.33.1702)