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'" compatible with the area in which the bridge is located and approved by the City Engineer. (12) Culverts shall be designed in accordance with the Virginia Department of Transportation design standards and details. Endwalls shall be provided as required by the City Engineer and shall conform to Virginia Department of Transportation standards or city standards. The developer shall provide for soil bearing investigations to determine foundation requirements. Pilings for culvert support shall be provided if needed. Ample waterway shall be provided for in culvert design, based on five-year storm recurrence and the drainage area served by the culverts. When requested by the City Engineer, the developer shall provide calculations for major culverts and bridge crossings which shall be based on a 25-year frequency to ensure that no flood hazard will result to the public rights-of-way or to residences or other structures. (13 ) For the purpose of creating residential lots on existing streets, the Planning Director may modify or waive the street grading, pavement base, surface and curb and gutter requirements on an existing street constructed without such required improvements if: a. The city has no plans to install such improvements on the street within the next ten years; b. The street is currently improved or will be improved to a standard equivalent to similar streets in the neighborhood; c. After consultation with the City Engineer, a determination is made that the street will provide adequate and safe access and drainage to existing and future residents in accordance with the purposes of the subdivision ordinance; and d. The real property for which the waiver or modification is sought contains no more than five new, adjacent lots. Any such waiver or modification shall not apply to required drainage improvements except for curbs and gutters. (b) All engineering calculations, including soil test results, shall be furnished to the City Engineer with required submittals. Approval by the City Engineer shall not release the developer from the requirements for a safe and functional design. (c) The developer shall be required to furnish all other data pertaining to bridges and culverts which shall be deemed necessary by the City Engineer. (d) The cost of all physical improvements required by the provisions of this section shall be paid by the subdivider. If the actual installation of improvements is not completed prior to the application made for final plat approval, the subdivider shall execute and file with the City Engineer an agreement and bond in an amount equal to the estimated costs (as established by the city) of such improvements, plus ten percent, guaranteeing that the required improvements will be properly and satisfactorily installed within a reasonable length of time, but, in no event, more than two years. An irrevocable letter of credit issued by a bank in a form approved by the city attorney or a deposit of funds in escrow may be accepted in lieu of bond under the same terms and conditions applicable to bonds. The bond, letter of credit or deposit may be released by the city when specific improvements covered by the bond have been completed and approved by the City Engineer as being in accordance with city standards and specifications. (e) Upon written request by the subdivider to the City Engineer, periodic partial releases of the bond, letter of credit, escrow or other performance guarantee may be made in an accumulative amount equal to no less than 80 percent of the original amount of such bond, letter of credit, escrow or other performance guarantee. Periodic partial releases shall be based upon the percentage of facilities completed and accepted by the City Engineer. Periodic partial releases may not occur before the completion of at least 30 percent of the facilities. The City Engineer shall not be required to approve more than three periodic partial releases in any 12-month period. Within 30 days after receipt of a Page 28 of 33